JE Electrical Engineering Vol 1 PDF
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This book contains solved papers from previous years' exams for various electrical engineering jobs and competitive exams in India.
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Youth Competition Times ALL INDIA JE, ENGINEERING SERVICES AND PSU'S EXAMINATIONS ELECTRICAL ENGINEERING VOLUME-1 [English Medium] Previous Years Chapterwise and Sub-topicwise Objective Solved P...
Youth Competition Times ALL INDIA JE, ENGINEERING SERVICES AND PSU'S EXAMINATIONS ELECTRICAL ENGINEERING VOLUME-1 [English Medium] Previous Years Chapterwise and Sub-topicwise Objective Solved Papers Useful for : SSC JE, UPPCL, UPRVUNL JE/AE, UPPSC AE, UPSSSC JE, UP JN, APGCL AM/JM, BSPHCL JE, CHHATTISGARH PSC/CGPEB AE/JE, DSSSB JE, DDA JE, ESE, ESIC, GUJARAT/ GSSSB/GMC /GSECL/MGCVCL/PGVCL, HPSSC, HSSC, ISRO TA, JAMMU & KASHMIR SSB, JHARKHAND PSC, KARNATAKA PSC/KPTCL/KPCL/BMRCL, KERALA PSC AE/JE, DMRC/NMRC/ UPMRCL/ JMRC JE/AM, MAHARASHTRA JE, MIZORAM PSC JE/AE, MPPEB, NAGALAND PSC, NCL OVERSEER/SURVEYOR, NLC GET, OPSC AEE, OSSC JE, PGCIL Diploma Trainee, PSTCL/PSPCL, RSMSSB JE, RPSC AE, RRB JE, TELANGANA PSC AEE/AE, UTTARAKHAND PSC/UKSSSC/UJVNL/PTCUL/UPCL AE/JE, WEST BENGAL PSC/SUB ASSISTANT ENGINEER/ JE/KMC SAE, OTHER STATE PSC JE/PSU JE. Chief Editor Anand Kumar Mahajan Compiled by Er. Pradeep Kumar Writer & Edited by Er. Anil Kumar, Er. Rakesh Patel, Er. Sandeep Yadav Computer Graphics by Balkrishna, Charan Singh Editorial Office Youth Competition Times 12, Church Lane Prayagraj-211002 Mob. : 9415650134 Email : [email protected] website : www.yctbooks.com Publisher Declaration Edited and Published by A.K. Mahajan for YCT Publications Pvt. Ltd. and printed by Om Sai Offset, Prayagraj. In order to publish the book, full care has been taken by the editor and the publisher, still your suggestions and queries are welcomed. Rs. : 795/- In the event of any dispute, the Judicial area will be Prayagraj. INDEX (VOLUME-I) Electrical Engineering Syllabus----------------------------------------------------------------------------- 4-7 Electrical JE/AE, PSC & PSU's Previous Exam Papers Analysis Chart ------------------------- 8-13 Trend Analysis of Previous Year Papers Through Bar Graph and Pie Chart ------------------ 14-14 NETWORK THEORY............................................................................................................... 15-570 i. Basic Circuit................................................................................................................................. 15 ii. Steady State and Transient State Analysis.................................................................................. 280 iii. Network Theorems..................................................................................................................... 308 iv. Two Port & Network Function................................................................................................... 360 v. Magnetic Coupled Circuit, Duality............................................................................................. 383 vi. Graph Theory.............................................................................................................................. 413 vii. AC circuit................................................................................................................................... 415 viii. Resonance................................................................................................................................... 518 ix. Three Phase Circuit.................................................................................................................... 540 x. Miscellaneous............................................................................................................................. 569 ELECTROMAGNETIC FIELD THEORY............................................................................ 571-702 ELECTRICAL AND ELECTRONIC ENGINEERING MATERIALS.............................. 703-754 ELECTRICAL INSTRUMENTS AND MEASUREMENTS................................................ 755-950 i. Introduction to Electrical Measuring Instruments...................................................................... 755 ii. Measurements and Errors........................................................................................................... 759 iii. Instruments and Their Requirements.......................................................................................... 767 iv. Ammeters and Voltmeters.......................................................................................................... 793 v. Wattmeters................................................................................................................................. 831 vi. Energy Meter.............................................................................................................................. 858 vii. Miscellaneous Measuring Instruments....................................................................................... 869 viii. Electronic Instruments................................................................................................................ 881 ix. Measurement of Resistance, Inductance and Capacitance................................................................... 902 x. Elements of Process Instrumentation.......................................................................................... 927 POWER PLANT..................................................................................................................... 951-1036 i. Power Plant Cycle...................................................................................................................... 951 ii. Thermal Power Plant.................................................................................................................. 954 iii. Hydro Power Plant...................................................................................................................... 968 iv. Nuclear Power Plant................................................................................................................... 978 v. Diesel Engine Power Plant......................................................................................................... 984 vi. Gas Turbine Power Plant............................................................................................................ 987 vii. Combined working of Power Plant............................................................................................ 989 viii. Non-conventional Sources of Energy......................................................................................... 990 ix. Economics of power generation............................................................................................... 1004 2 TRANSMISSION AND DISTRIBUTION OF ELECTRICAL POWER........................ 1037-1163 i. Design of Electrical Lines........................................................................................................ 1037 ii. Parameters of Lines.................................................................................................................. 1046 iii. Performance of Short Lines...................................................................................................... 1061 iv. Constructional Features of Transmission Lines....................................................................... 1069 v. Mechanical Design of Lines..................................................................................................... 1078 vi. Underground Cables................................................................................................................. 1100 vii. Cable Faults and Tests.............................................................................................................. 1112 viii. Economic Principle of Transmission........................................................................................ 1113 ix. D.C. Distribution System.......................................................................................................... 1115 x. A.C. Distribution...................................................................................................................... 1117 xi. Power Factor Improvement...................................................................................................... 1118 xii. Power Line Carrier Communication System............................................................................ 1122 xiii. Construction of Distribution Lines........................................................................................... 1124 xiv. Voltage control......................................................................................................................... 1132 xv. Electrical Faults and Protection................................................................................................ 1138 xvi. Bus Bar and load flow analysis................................................................................................ 1142 xvii. Substation................................................................................................................................. 1154 xviii. Electric Power System Management...................................................................................... 1156 ELECTRICAL SWITCHGEAR AND PROTECTION.................................................... 1164-1243 i. Electrical Faults........................................................................................................................ 1164 ii. Switches and Isolators.............................................................................................................. 1178 iii. Fuse........................................................................................................................................... 1180 iv. Circuit Breaker......................................................................................................................... 1188 v. Introduction to Protective Relaying.......................................................................................... 1207 vi. Construction and Operating Principle of Relays...................................................................... 1210 vii. Electrical Protecting Schemes............................................................................................................. 1218 viii. Protection of Alternators.......................................................................................................... 1219 ix. Protection of Power Transformers............................................................................................ 1227 x. Protection of Motors................................................................................................................. 1232 xi. Protection of Feeders................................................................................................................ 1233 xii. Protection Against Overvoltage................................................................................................ 1235 xiii. Reactors.................................................................................................................................... 1242 EARTHING AND WIRING................................................................................................. 1244-1274 SYSTEM AND SIGNAL PROCESSING........................................................................... 1275-1296 Note:- Electrical Machine-I Electrical Machine-II Utilization of Electrical Energy Electronics-I Electronics-II Power Electronics and Drives Control System PLC SCADA and Computer Industrial Management & Entrepreneurship Development Engineering Mathematics (Study Volume II). 3 SSC Junior Engineer Paper Syllabus ELECTRICAL ENGINEERING The Examination will be conducted in two stages: A. Paper-I (Pre) (200 marks) B. Paper-II (Mains) (300 marks) Total Written Test (500 marks) Written Test : Paper Subject Max. Mark Duration & Timing Paper-I (i) General Intelligence & Reasoning 50 2 Hours Objective type (ii) General Awareness 50 (iii) General Engineering (Electrical) 100 Paper-II General Engineering (Electrical) 300 2 Hours Conventional There will be negative marking of 0.25 marks for each wrong answer in Paper-I. Candidates are, therefore advised to keep this in mind while answering the questions. Paper-II will be Descriptive Type. SSC JE Syllabus of Examination: Indicative Syllabus: The standard of the questions in Engineering subjects will be approximately of the level of Diploma in Engineering (Civil/ Electrical/ Mechanical) from a recognized Institute, Board or University recognized by All India Board of Technical Education. All the questions will be set in SI units. The details of the syllabus are given below. Paper-I General Intelligence & Reasoning: The Syllabus for General Intelligence would include questions of both verbal and non-verbal type. The test may include questions on analogies, similarities, differences, space visualization, problem solving, analysis, judgment, decision making, visual memory, discrimination, observation, relationship concepts, arithmetical reasoning, verbal and figure classification, arithmetical number series etc. The test will also include questions designed to test the candidate’s abilities to deal with abstract ideas and symbols and their relationships, arithmetical computations and other analytical functions. General Awareness: Questions will be aimed at testing the candidate’s general awareness of the environment around him/her and its application to society. Questions will also be designed to test knowledge of current events and of such matters of everyday observations and experience in their scientific aspect as may be expected of any educated person. The test will also include questions relating to India and its neighbouring countries especially pertaining to History, Culture, Geography, Economic Scene, General Polity and Scientific Research, etc. These questions will be such that they do not require a special study of any discipline. General Engineering Electrical Electrical Engineering Basic concepts, Circuit law, Magnetic Circuit, AC Fundamentals, Measurement and Measuring instruments, Electrical Machines, Fractional Kilowatt Motors and single phase induction Motors, Synchronous Machines, Generation, Transmission and Distribution, Estimation and Costing, Utilization of Electrical Energy, Basic Electronics. 4 Detailed Syllabus (JE Electrical Engineering) Basic concepts: Concepts of resistance, inductance, capacitance, and various factors affecting them. Concepts of current, voltage, power, energy and their units. Circuit law : Kirchhoff’s law, Simple Circuit solution using network theorems. Magnetic Circuit : Concepts of flux, mmf, reluctance, Different kinds of magnetic materials, Magnetic calculations for conductors of different configuration e.g. straight, circular, solenoidal, etc. Electromagnetic induction, self and mutual induction. AC Fundamentals : Instantaneous, peak, R.M.S. and average values of alternating waves, Representation of sinusoidal wave form, simple series and parallel AC circuits consisting of R.L. and C, Resonance, Tank Circuit. Poly Phase system – star and delta connection, 3 phase power, DC and sinusoidal response of R-Land R-C circuit. Measurement and measuring instruments : Measurement of power (1-phase and 3-phase, both active and reactive) and energy, 2 wattmeter method of 3 phase power measurement. Measurement of frequency and phase angle. Ammeter and voltmeter (both moving coil and moving iron type), extension of range wattmeter, Multimeters, Megger, Energy meter AC Bridges. Use of CRO, Signal Generator, CT, PT and their uses. Earth Fault detection. Electrical Machines : D.C. Machine – Construction, Basic Principles of D.C. motors and generators, their characteristics, speed control and starting of D.C. Motors. Method of motor's braking, Losses and efficiency of D.C. Machines. (b) 1- phase and 3-phase transformers – Construction, Principles of operation, equivalent circuit, voltage regulation, O.C. and S.C. Tests, Losses and efficiency. Effect of voltage, frequency and wave form on losses. Parallel operation of 1 phase / 3-phase transformers. Auto transformers. (c) 3-phase induction motors, rotating magnetic field, principle of operation, equivalent circuit, torque-speed characteristics, starting and speed control of 3- phase induction motors. Methods of braking, effect of voltage and frequency variation on torque-speed characteristics. Fractional Kilowatt Motors and Single Phase Induction Motors : Characteristics and applications. Synchronous Machines – Generation of 3-phase e.m.f. armature reaction, voltage regulation, parallel operation of two alternators, synchronizing, control of active and reactive power. Starting and applications of synchronous motors. Generation, Transmission and Distribution – Different types of power stations, Load factor, diversity factor, demand factor, cost of generation, inter- connection of power stations. Power factor improvement, various types of tariffs, types of faults, short circuit current for symmetrical faults. Switchgears – rating of circuit breakers, Principles of arc extinction by oil and air, H.R.C. Fuses, Protection against earth leakage / over current, etc. Buchholtz relay, Merz-Price system of protection of generators & transformers, protection of feeders and bus bars. Lightning arresters, various transmission and distribution system, comparison of conductor materials, efficiency of different system. Cable – different type of cables, cable rating and derating factor. Estimation and costing : Estimation of lighting scheme, electric installation of machines and relevant IE rules. Earthing practices and IE Rules. Utilization of Electrial Energy : Illumination, Electric heating, Electric welding, Electroplating, Electric drives and motors. Basic Electronics : Working of various electronic devices e.g. P-N Junction diodes, Transistors (NPN and PNP type), BJT and JFET. Simple circuits using these devices. 5 UPPCL JE Electrical Syllabus & Exam Pattern Uttar Pradesh Power Corporation Limited Reasoning Ability : (UPPCL) will conduct a Written exam for Questions will be asked from analogies, recruitment for JE Electrical. The standard of similarities and differences, spatial visualization, Competition level is raising with the time period spatial orientation, problem solving, analysis, as we are going onwards and time passing away judgment, decision making, visual memory, rapidly. So candidate should knows that what discrimination, observation, relationship should they have to prepare for their performance concepts, arithmetic reasoning, verbal and figure in examination. Candidates who are going to face classification, arithmetical number series, non- this exam and are ignoramus about the scheme verbal series, coding and decoding, statement and syllabus. Now, here we are providing conclusion, syllogistic reasoning. recommended latest exam pattern and syllabus. General Hindi : Exam Pattern : Standard of questions will be metric education. Exam pattern for JE Electrical written Exam is as Spot the Error, Fill in the Blanks, Follows :- Synonyms/Homonyms, Antonyms, Spellings/ Detecting Mis-spelt words, Idiom & Phrases, One Subjects No of Marks word substitution, Improvement of Sentences, Questions Active/Passive Voice of Verbs, Conversion into Technical Subject 150 150 Direct/Indirect narration, Shuffling of Sentence parts, Shuffling of Sentences in a passage, Cloze General 20 20 Passage, Comprehension Passage. Knowledge Technical Subject (Electrical) Reasoning Ability 20 20 Basic concepts: General Hindi 10 10 Concepts of resistance, inductance, TOTAL 200 200 capacitance, and various factors affecting them. Concepts of current, voltage, power, General Knowledge : energy and their units. History, Geography and Socio Economic Circuit law : development of India. Knowledge of current events of National and International importance Kirchhoff’s law, Simple Circuit solution and such matters of every day observation and using network theorems. experience in their scientific aspects as may be Magnetic Circuit : expected of an educated person who has not Concepts of flux, mmf, reluctance, Different made a special study of any scientific subject. kinds of magnetic materials, Magnetic Paper will also include questions on Modern calculations for conductors of different History (From 1857 onwards) of India, Indian configuration e.g. straight, circular, culture, Indian Polity, Indian Economy, solenoidal, etc. Electromagnetic induction, Geography, Polity of India. self and mutual induction. 6 AC Fundamentals : Fractional Kilowatt Motors and Single Phase Instantaneous, peak, R.M.S. and average Induction Motors: Characteristics and values of alternating waves, Representation applications. of sinusoidal wave form, simple series and Synchronous Machines – parallel AC circuits consisting of R.L. and C, Generation of 3-phase e.m.f. armature Resonance, Tank Circuit. Poly Phase system reaction, voltage regulation, parallel – star and delta connection, 3 phase power, operation of two alternators, synchronizing, DC and sinusoidal response of R-Land R-C control of active and reactive power. Starting circuit. and applications of synchronous motors. Measurement and measuring instruments : Generation, Transmission and Distribution – Different types of power stations, Load Measurement of power (1 phase and 3 factor, diversity factor, demand factor, cost phase, both active and re-active) and energy, of generation, inter-connection of power 2 wattmeter method of 3 phase power stations. Power factor improvement, various measurement. Measurement of frequency types of tariffs, types of faults, short circuit and phase angle. Ammeter and voltmeter current for symmetrical faults. Switchgears – (both moving oil and moving iron type), rating of circuit breakers, Principles of arc extension of range wattmeter, Multimeters, extinction by oil and air, H.R.C. Fuses, Megger, Energy meter AC Bridges. Use of Protection against earth leakage / over CRO, Signal Generator, CT, PT and their current, etc. Buchholtz relay, Merz-Price uses. Earth Fault detection. system of protection of generators & Electrical Machines : transformers, protection of feeders and bus bars. Lightning arresters, various D.C. Machine – Construction, Basic transmission and distribution system, Principles of D.C. motors and generators, comparison of conductor materials, their characteristics, speed control and efficiency of different system. Cable – starting of D.C. Motors. Method of braking Different type of cables, cable rating and motor, Losses and efficiency of D.C. derating factor. Machines. (b) 1 phase and 3 phase Estimation and costing : transformers – Construction, Principles of Estimation of lighting scheme, electric operation, equivalent circuit, voltage installation of machines and relevant IE regulation, O.C. and S.C. Tests, Losses and rules. Earthing practices and IE Rules. efficiency. Effect of voltage, frequency and Utilization of Electrial Energy : wave form on losses. Parallel operation of 1 phase / 3 phase transformers. Auto Illumination, Electric heating, Electric transformers. (c) 3 phase induction motors, welding, Electroplating, Electric drives and rotating magnetic field, principle of motors. operation, equivalent circuit, torque-speed Basic Electronics : characteristics, starting and speed control of Working of various electronic devices e.g. P 3 phase induction motors. Methods of N Junction diodes, Transistors (NPN and braking, effect of voltage and frequency PNP type), BJT and JFET. Simple circuits variation on torque speed characteristics. using these devices 7 Electrical Engineering JE/AE Previous Papers Analysis Chart S.L. Exam NAME EXAM DATE/TIME No. of Questions UPPCL/UPRVUNL JE/AE 1. UPPCL JE Shift-I 08.09.2021 150 2. UPPCL JE Shift-II 08.09.2021 150 3. UPPCL JE Shift-I 07.09.2021 150 4. UPPCL JE Shift-II 07.09.2021 150 5. UPPCL JE Shift-I 25.11.2019 150 6. UPPCL JE Shift-II 25.11.2019 150 7. UPPCL JE Shift-I 27.11.2019 150 8. UPPCL JE Shift-II 27.11.2019 150 9. UPPCL JE Shift-I 27.08.2018 150 10. UPPCL JE Shift-II 27.08.2018 150 11. UPPCL JE Shift-I 11.02.2018 150 12. UPPCL JE Shift-II 11.02.2018 150 13. UPPCL JE 11.11.2016 150 14. UPPCL JE 14.03.2016 150 15. UPPCL JE 23.08.2015 150 16. UPPCL JE 17.11.2013 150 17. UPRVUNL AE 05.07.2021 150 18. UPRVUNL JE 09.11.2016 150 19. UPRVUNL JE 21.09.2015 150 20. UPRVUNL JE 2014 150 UPPSC/UPSSSC 21. UPPSC AE Paper-I 13.12.2020 100 22. UPPSC AE Paper-II 13.12.2020 100 23. UPSSSC JE 31.07.2016 125 24. UPSSSC JE 27.12.2015 125 Uttar Pradesh Jal Nigam 25. UP Jal Nigam JE 16.07.2013 15 26. UP Jal Nigam JE 23.11.2014 15 Staff Selection Commission (SSC JE) 27. SSC JE Shift-I 24.03.2021 100 28. SSC JE Shift-II 24.03.2021 100 29. SSC JE Shift-II 29.10.2020 100 30. SSC JE Shift-II 10.12.2020 100 31. SSC JE Shift-I 28.10.2020 100 32. SSC JE Shift-I 26.09.2019 100 33. SSC JE Shift-II 26.09.2019 100 34. SSC JE Shift-I 29.01.2018 100 35. SSC JE Shift-II 29.01.2018 100 36. SSC JE Shift-I 27.01.2018 100 37. SSC JE Shift-II 27.01.2018 100 38. SSC JE Shift-I 25.01.2018 100 39. SSC JE Shift-II 25.01.2018 100 40. SSC JE Shift-I 24.01.2018 100 41. SSC JE Shift-II 24.01.2018 100 42. SSC JE Shift-I 23.01.2018 100 43. SSC JE Shift-II 23.01.2018 100 44. SSC JE Shift-I 22.01.2018 100 45. SSC JE Shift-II 22.01.2018 100 8 46. SSC JE Shift-I 04.03.2017 100 47. SSC JE Shift-II 04.03.2017 100 48. SSC JE Shift-I 03.03.2017 100 49. SSC JE Shift-I 03.03.2017 100 50. SSC JE Shift-II 02.03.2017 100 51. SSC JE Shift-II 02.03.2017 100 52. SSC JE Shift-II 01.03.2017 100 53. SSC JE Shift-I 01.03.2017 100 54. SSC JE 2015 100 55. SSC JE Shift-I 2014 100 56. SSC JE Shift-II 2014 100 57. SSC JE 2013 100 58. SSC JE 2012 100 59. SSC JE Shift-I 2011 100 60. SSC JE Shift-II 2011 100 61. SSC JE 2010 100 62. SSC JE 2009 100 63. SSC JE 2008 100 64. SSC JE 2007 100 Assam Power Generation Corporation Ltd. 65. APGCL AM 2021 60 66. APGCL JM 2021 100 Bharat Sanchar Nigam Limited (BSNL TTA) 67. BSNL TTA 20.12.2015 180 68. BSNL TTA Shift-I 29.09.2016 180 69. BSNL TTA Shift-II 29.09.2016 180 70. BSNL TTA Shift-I 25.09.2016 180 71. BSNL TTA Shift-II 25.09.2016 180 72. BSNL TTA Shift-I 26.09.2016 180 73. BSNL TTA Shift-II 26.09.2016 180 74. BSNL TTA Shift-I 27.09.2016 180 75. BSNL TTA Shift-II 27.09.2016 180 76. BSNL TTA Shift-I 28.09.2016 180 77. BSNL TTA Shift-II 28.09.2016 180 78. BSNL TTA 21.02.2016 180 79. BSNL TTA 21.02.2016 180 Bureau of Indian Standards 80. BIS Technical Asstt. 2020 50 Bihar State Power Holding Company Limited (BSPHCL) 81. BSPHCL JE 30.01.2019 50 82. BSPHCL JE 31.01.2019 50 Chennai Petroleum Corporation Ltd. 83. CPCL Jr. Engg. Asstt. 2019 70 Chhattisgarh PSC 84. CGPSC AE 15.01.2021 150 DFCCIL 85. DFCCIL Executive 30.09.2021 96 86. DFCCIL Executive 17.04.2016 80 87. DFCCIL Executive 11.11.2018 96 DGVCL 88. DGVCL JE Shift-I 06.01.2021 60 89. DGVCL JE Shift-II 06.01.2021 60 90. DGVCL JE Shift-III 06.01.2021 60 9 91. DGVCL JE Shift-II 05.01.2021 60 92. DGVCL JE Shift-III 05.01.2021 60 93. DGVCL JE 2016 100 Delhi Metro Rail Corporation (DMRC) 94. DMRC JE 20.02.2020 75 95. DMRC JE 18.02.2017 75 96. DMRC JE Shift-II 09.04.2018 75 97. DMRC JE 03.08.2014 120 98. DMRC JE 15.03.2015 120 99. DMRC JE Shift III 09.04.2018 75 100. DMRC JE 15.02.2020 75 101. DMRC JE Shift-II 10.04.2018 75 DSSSB 102. DSSSB JE 2019 100 103. DSSSB JE 19.03.2021 100 Energy Efficiency Services Limited 104. EESL Engineer Shift-II 23.10.2020 80 ESE 105. ESE 2001–2016 1000 106. ESE (Pre) 18.07.2021 150 107. ESE (Pre) 05.01.2020 150 108. ESE (Pre) 06.01.2019 150 109. ESE (Pre) 07.01.2018 150 110. ESE (Pre) 08.01.207 150 Employees State Insurance Corporation 111. ESIC JE 2018 100 112. ESIC JE 2016 100 Food Corporation of India 113. FCI JE 2015 120 Gujarat/GPSC/GETCO/GSSSB/ GSECL/UGCVCL/ PGVCL 114. GPSC AAE Class-3 25.07.2021 200 115. GSSSB AAE 07.02.2021 60 116. MGVCL JE Shift-I 30.07.2021 60 117. MGVCL JE Shift-II 30.07.2021 60 118. MGVCL JE Shift-II 30.07.2021 60 119. GETCO JE 2015 80 120. GSECL JE Shift-I 2020 60 121. PGVCL JE Shift-I 22.01.2012 100 122. PGVCL JE 2018 80 123. PGVCL JE 2015 90 124. GSSSB Electrical Sub inspector 08.04.2018 150 125. UGVCL JE 04.08.2012 60 126. UGVCL JE 2014 75 Haryana SSC 127. HSSC JE 10.04.2018 50 Himachal Pradesh Staff Selection Commission 128. HPSSC JE 08.08.2021 120 129. HPSSC JE 18.07.2021 120 130. HPSSC JE (Code- 579) 2017 120 131. HPSSC JE 2018 120 132. HPSSC JE (Code- 580) 2019 120 133. HPSSSC JE (Code -579) 2018 120 134. HPSSSC JE 18.11.2018 120 10 Hindustan Petroleum Corporation Limited 135. HPCL Engineer 12.08.2021 85 136. HPCL (HRRL) E1 & E2 07.08.2021 85 ISRO Technical Assistant 137. ISRO VSSC (TA) 14.07.2021 80 138. ISRO TA EE 06.08.2017 80 139. ISRO TA EE 06.08.2016 80 140. ISRO TA EE 21-6-2015 80 Jammu and Kashmir Services Selection Board 141. JKSSB JE 2014 150 Jharkhand PSC 142. JPSC AE Paper I 10.04.2021 100 143. JPSC AE Paper II 10.04.2021 100 144. JUVNL JE 08.03.2017 70 Karnataka PSC 145. Karnataka PSC JE 2017 100 146. Karnataka PSC JE 2016 100 147. KPTCL JE 2017 75 148. KPTCL JE 2016 100 149. KPTCL JE 2015 100 150. BWSSB JE 2018 100 151. BWSSB JE Paper -II 09.04.2017 100 152. BWSSB JE Paper -II 10.01.2017 100 153. BWSSB JE Paper -II 10.04.2016 100 154. BWSSB JE Paper -II 13.11.2016 100 155. BWSSB JE 30.05.2017 100 Kerala PSC 156. Kerala PSC Draftsman 2016 80 157. Kerala PSC Electrical Inspectorate 2015 80 158. KSEB JE 2015 100 Kendriya Vidyalaya Sangathan 159. KVS TGT Paper-II 2017 100 UP Metro Rail Corporation Ltd. (LMRC JE) 160. LMRC JE 26.06.2015 75 161. LMRC JE 17.03.2016 90 162. LMRC (SCTO) 17.04.2021 90 Mizoram PSC 163. Mizoram PSC AE SDO PHE Paper-I 2014 50 164. Mizoram PSC AE SDO PHE Paper-II 2014 50 165. Mizoram PSC IOF Paper-I 2019 50 166. Mizoram PSC IOF Paper-II 2019 100 167. Mizoram PSC JE IOF Paper-III 2019 100 168. Mizoram PSC JE (Jr. Grade of MES) Paper-I 2018 50 169. Mizoram PSC JE PHED Paper- I April 2016 75 170. Mizoram PSC JE (Jr. Grade of MES) Paper-I November 2015 50 171. Mizoram PSC (Jr. Grade of MES) Paper-III November 2015 50 172. Mizoram PSC (Jr. Grade of MES) Paper-II November 2015 50 MPPGCL/MPPEB 173. MPPKVVCL JE 16.08.2021 75 174. MPPKVVCL JE 21.08.2021 75 175. MPMKVVCL JE 24.08.2021 75 176. MPPEB Sub Engineer 08.07.2017 100 11 Nagaland PSC 177. Nagaland PSC CTSE (Diploma) 2018 200 178. Nagaland PSC CTSE (Diploma) 2017 200 179. Nagaland PSC CTSE (Diploma) 2016 200 180. Nagaland PSC CTSE (Diploma) 2015 200 NLC India Limited 181. NLC GET Shift-I 17.11.2020 80 Noida & Jaipur Metro Rail Corporation (NMRC/JMRC) 182. JMRC JE 05.02.2021 50 183. NMRC JE 05.03.2017 75 184. NMRC JE 2019 45 NPCIL 185. NPCIL Stipendry Trainee 2019 120 186. NPCIL Stipendry Trainee 2016 120 National Seeds Corporation Limited 187. NSCL Diploma Trainee 24.02.2021 70 Odisha Public Service Commission 188. OPSC AEE Paper-I 28.02.2021 180 189. OPSC AEE Paper-II 28.02.2021 180 Power Grid Corporation of India Limited 190. PGCIL DT NR-I 13.08.2021 120 191. PGCIL DT NR-III 22.08.2021 120 192. PGCIL DT SR-I 22.08.2021 120 193. PGCIL DT SR-II 22.08.2021 120 194. PGCIL Field Supervisor 27.07.2021 120 195. PGCIL DT 17.12.2020 120 196. PGCIL DT 14.11.2018 120 197. PGCIL DT 13.09.2018 120 198. PGCIL DT 27.10.2018 120 PSPCL/PSTCL AE/JE (Punjab) 199. PSTCL JE 02.08.2021 60 200. PSTCL AE 06.08.2021 60 201. PSPCL JE Shift-I 2019 70 202. PSPCL JE shift-II 2019 70 203. PSPCL JE 2018 70 204. Punjab Mandi Board JE 2014 100 RPSC/RSMSSB 205. RPSC Lect. (Tech. Edu. Dept.) Paper-I 16.03.2021 150 206. RPSC Lect. (Tech. Edu. Dept.) Paper-II 16.03.2021 150 207. RPSC ACF & FRO 23.02.2021 120 208. RPSC Lect. (Tech. Edu. Dept.) 09.01.2016 100 209. RSMSSB JE (Degree) 29.11.2020 80 210. RSMSSB JE (Diploma) 29.11.2020 80 211. RSMSSB JE (Degree) 26.12.2020 80 212. RSMSSB JE (Diploma) 26.12.2020 80 213. Rajasthan JE PHED (Diploma) 2015 100 214. RSEB JE 2013 120 215. RSEB JE 2011 120 Railway Recruitment Board JE/SSE 216. RRB JE Shift-I 01.09.2019 150 217. RRB JE Shift-II 19.09.2019 150 218. RRB JE Shift-II 30.08.2019 150 219. RRB JE Shift-I 26.08.2015 22 12 220. RRB JE Shift-II 26.08.2015 21 221. RRB JE Shift-III 26.08.2015 20 222. RRB JE Shift-I 27.08.2015 22 223. RRB JE Shift-II 27.08.2015 20 224. RRB JE Shift-III 27.08.2015 21 225. RRB JE Shift-I 28.08.2015 20 226. RRB JE Shift-II 28.08.2015 22 227. RRB JE Shift-III 28.08.2015 21 228. RRB JE Shift-I 29.08.2015 22 229. RRB JE Shift-II 29.08.2015 22 230. RRB JE Shift-III 29.08.2015 22 231. RRB JE Shift-III 30.08.2015 22 232. RRB JE Shift-II 04.09.2015 22 233. RRB JE Shift-III 16.09.2015 23 234. RRB SSE Shift-I 01.09.2015 21 235. RRB SSE Shift-II 01.09.2015 22 236. RRB SSE Shift-III 01.09.2015 20 237. RRB SSE Shift-I 02.09.2015 20 238. RRB SSE Shift-II 02.09.2015 21 239. RRB SSE Shift-III 02.09.2015 22 240. RRB SSE Shift-I 03.09.2015 22 241. RRB SSE Shift-II 03.09.2015 21 242. RRB SSE Shift-III 03.09.2015 20 243. RRB JE Allahabad 2014 22 244. RRB JE Gorakhpur 2014 23 245. RRB JE Chandigarh 2014 22 246. RRB JE Ranchi 2014 23 247. RRB JE Guwahati 2014 22 248. RRB JE Bhopal 2014 23 249. RRB JE Ahmedabad 2014 22 250. RRB JE Ajmer 2014 21 Telengana PSC 251. TS TRANSCO JE 2018 65 252. TSPSC HMWSSB Manager 2020 150 Uttarakhand PSC/UKSSSC JE/AE 253. UKSSSC JE 10.01.2021 100 254. UKPSC JE Paper-I 2013 180 255. UKPSC JE Paper-II 2013 180 256. UJVNL JE 2016 126 Vizag Steel JET 257. Vizag Steel MT 13.12.2020 100 258. Vizag Steel JET 27.10.2018 75 259. Vizag Steel JET Shift-I 25.10.2018 75 260. Vizag Steel JET Shift-II 25.10.2018 75 WBPSC SAE 261. WBPSC SAE 2018 100 262. WBPSC SAE 2005 100 263. WBPSC SAE 2004 100 264. WBPSC SAE 2003 100 265. WBPSC SAE 2002 100 266. WBPSC SAE 2000 100 Total 26712 13 Trend Analysis of Previous Year JE/AE Papers Through Bar Graph and Pie Chart 14 01. NETWORK THEORY I. Basic Circuit 3. For an ideal current source, the internal resistance is: 1. Which of the following laws states that: in any (a) infinite and connected in parallel electrical network, the algebraic sum of the (b) zero and connected in parallel currents meeting at a point is zero? (c) infinite and connected in series (a) Ohm’s law (d) zero and connected in series HPSSC JE 08.08.2021 (b) Kirchhoff’s Voltage Law (KVL) GPSC AAE, CLASS-3, 25.07.2021 (c) Faraday’s law UPPSC AE 13.12.2020, Paper-I (d) Kirchhoff’s Current Law (KCL) MPMKVVCL (Bhopal) JE 2018 SSC JE 24.03.2021, Shift-I RPSC Lect. (Tech. Edu. Dept.) 09.01.2016 RSMSSB JEN (Diploma) 29.11.2020 Ans. (a) : For an ideal current source the internal PGCIL Diploma Trainee 14.11.2018 resistance is infinite and connected in parallel, such that SSC JE 24.01.2018, Shift-II ideal current source provide constant current SSC JE 29.01.2018, Shift-I irrespective of load. SSC JE 27.01.2018, Shift-II SSC JE 25.01.2018, Shift-I 4. Which of the following conductors has the NPCIL Stipendiary Trainee 2016 lowest resistivity? BSNL TTA 29.09.2016, 3 PM (a) Aluminium (b) Copper Ans : (d) Kirchhoff’s current law (KCL), gives the law (c) Gold (d) Silver UPPCL JE 07.09.2021, Shift-I of conservation of charge, which states that the NPCIL ST 2019 (Kakrapar) algebraic sum of currents at any node on a Ans. (d) : Descending order of conductivity is given as circuit/Network is always equal to zero. follows i.e. i 0 Ag > Cu > Au > Al 1 Conductivity Resistivity So, Ascending order of resistivity Ag < Cu < Au < Al 5. The energy used by a 1.5 kW heater in 5 i1 i 2 i3 i 4 i5 minutes is. (a) 450,000 J (b) 450 J 2. The SI unit of conductivity is- (c) 7500 J (d) 4.5 J (a) Ohm-m (b) Ohm/m PSTCL JE 02.08.2021 (c) Mho-m (d) Mho/m CPCL JE 2019 DSSSB JE 14.03.2021, Shift-I Ans. (a) : The energy used by heater– NPCIL ST 2019 (Kakrapar) E=P×t MPMKVVCL (Bhopal) JE 2018 = 1.5 × 1000 × 5 × 60 J UPPCL JE 2018, Shift-II Vizag steel JET 25.10.2018, Shift-II = 450,000 J UPPCL JE 27.08.2018, Shift-I 6. Ohm's law is applicable to- SSC JE 22.01.2018, Shift-I (a) Semiconductors (b) Metallic conductors HPSSB JE 2017 (Post code-579) (c) Insulators (d) Electrolytes KPTCL JE 2015 PSPCL JE 2019, Shift-I SSC JE 2014, Shift-I NPCIL ST 2019 (Kakrapar) PGCIL Diploma Trainee 14.11.2011 MPMKVVCL (Bhopal) JE 2018 Ans. (d) : The SI unit of conductivity is Mho/m. PGCIL Diploma Trainee 14.11.2018 Ans. (b) : Ohm's law states that – If all the physical R conditions are unaffected, at constant temperature the A potential difference of a conducting wire is directly meter proportional to current applied on them. So, 2 V RA ohm(meter) i.e. I V I and hence follows linearity. R = (ohm meter)-1 Hence, Ohm's law is defined for conductor, not for = mho/meter -1 = mho insulator and semiconductor and electrolytes. Network Theory 15 YCT 7. Resistance of a conductor is directly 12. The following is correct: proportional to its- (a) P = V×I (b) P = I2× R 2 (a) Length (b) Area (c) P = V / R (d) All of the above (c) Velocity (d) Pressure ESIC JE 2019 NPCIL ST 2019 (Kakrapar) DGVCL JE 2016 Ans. (a) : Material property of resistance is defined Kerala PSC Draftman 2016, Grade II Ans. (d) : Power = Voltage × Current P = V×I As R A V IR Where P I R I I2 R = length of the conductor V A = cross section area of conductor and I R = conductivity of conductor 2 V V Hence R P V R R 8. A two coil heater gives its maximum heat output, when the coils are in: P = V×I= I2 R = V 2 /R (a) Series (b) Series parallel So, all of the above is correct (c) Parallel (d) OFF 13. Electric charge is equal to : Kerala PSC Asst: Gr. II Electrical Inspectorate 2015 (a) I t (b) I/t Ans. (c) : For given voltage, when two heating coil (c) I2t (d) I2/t connected in parallel, then maximum heat will produce. Kerala PSC Draftman 2016, Grade II Because when coils are connected in parallel, voltage Ans. (a) : Electric charge is the basic physical property will be same in each coil so maximum heat will produce. of material that causes it on experience a force when kept in an electric or magnetic field. 9. Conventional flow of electric current is from: (a) +ve to –ve (b) –ve to +ve Q I.t Coulomb (c) Phase to neutral (d) Neutral to phase 14. The reactance of 1 farad capacitance when Kerala PSC Asst: Gr. II Electrical Inspectorate 2015 connected to DC circuit is: Ans. (a) : Electric current always flow from positive (a) Infinite (b) 1 terminal to negative terminal or it always flow from higher potential to lower potential. (c) 0.5 (d) 0 NPCIL ST 2019 (Kakrapar) 10. Complicated series parallel combination of Ans. (a) : At steady state, capacitor behaves as an open resistances are also known as: (a) Electrical Networks (b) Combinations circuit for D.C. (c) Reactive Circuits (d) Tuned Circuits Hence in open circuit condition reactance will be Kerala PSC Asst: Gr. II Electrical Inspectorate 2015 infinite or current on capacitor will be zero. Ans. (a) : Complicated series parallel combination of Also f = 0 for D.C. resistances are also known as electrical Network. 1 1 Xc 11. If capacitors are connected in series, effective 2fC 2 0 1 capacitance is : 15. Unit of electric charge is: (a) C = C1 + C2 + C3 +......... (a) Tesla (b) Henry 1 1 1 1 (c) Coulomb (d) Farad (b) ....... C C 1 C 2 C3 SSC JE 27.01.2018, Shift-I UPPCL JE 27.08.2018, Shift-I 1 1 1 Kerala PSC Asst: Gr. II Electrical Inspectorate 2015 (c) C ......... C1 C 2 C3 SSC JE 2013 1 1 1 1 Ans. (c) : The SI unit of electric charge is the Coulomb, (d) C ......... which is defined as an ampere second. C1 C 2 C 3 C 4 Q=I×t Kerala PSC Draftman 2016, Grade II ISRO TA 2015 16. In a series combination of resistances total resistance is given by: Ans. (b) : If the capacitors are connected in series effective capacitance is– R R2 (a) R 1 1 1 1 1 1 R 1R 2 .......... C eff C1 C 2 C3 Cn 1 1 (b) R ... R1 R 2 (c) R = R1 + R2 +.... V (d) R I Kerala PSC Asst: Gr. II Electrical Inspectorate 2015 Network Theory 16 YCT Ans. (c) : Total resistance for series connection– 20. Which of the following type of resistors has R = R1 + R2 +...........+Rn highest value of temperature coefficient? For parallel connection (a) Wire wound (b) Carbon film 1 1 1 1 (c) Metal film (d) Carbon composition .......... DMRC JE 20.02.2020 R R1 R 2 Rn 17. A 10 ohm resistor connected in parallel with a Ans. (c) : Metal film resistors has highest value of 15 ohm resistor and the combination in series temperature coefficient from given option. with a 12 ohm resistor. The equivalent 21. If the current flowing through the conductor is resistance of the circuit is. 5A, then electrons per second will flow in the (a) 37 ohm (b) 27 ohm conductor at any passage. (c) 18 ohm (d) 20 ohm CPCL JE 2019 (a) 6.25×1018 (b) 31.35×1017 19 ESIC JE-2016 (c) 31.35×10 (d) 31.35×1018 Ans. (c) : DMRC JE 20.02.2020 Ans. (d) : Given that, Current i = 5A Time t = 1 sec Q ne ] e = 1.6×10–19 Coulomb In the circuit 10 and 15 resistances are in parallel to We know that- each other and series 12 resistance. Q it RAB = (10||15) + 12 ne it 10 15 it 5 1 = 12 n 31.25 1018 10 15 e 1.6 1019 10 15 = 12 = 18 31.35 1018 25 22. Two resistors R1= 10 and R2= 20 are 18. Unit of reactive power is. (a) Watt (b) KW connected in series order to a 30V direct (c) VAR (d) VA current (DC) source. Find the ratio (P1/P2) of CPCL JE 2019 the power expended by the resistors. Ans. (c) : (a) P1/P2= 1/3 (b) P1/P2= 1/4 (c) P1/P2= 1/2 (d) P1/P2= 2/1 DMRC JE 20.02.2020 Ans. (c) : True Power (P) = VI cos measured in units - Watts Reactive Power (Q) = VI sin V 30 30 I 1A measured in unit - VAR R 10 20 30 Apparent Power (S) = VI P1 I 2 R1 10W measured in unit – VA P2 I 2 R 2 20W 19. An energy source flows a steady current of 2A to 10s in an electric bulb. If it emits 2.3 kJ of P1/P2= 10/20 = 1/2 energy in the form of light and thermal energy. 23. How much energy will be, a 100W electric bulb Find the voltage drop in the bulb? spend in two hours? (a) 130 V (b) 260 V (a) 72 kJ (b) 7200 J (c) 115 V (d) 230 V DMRC JE 20.02.2020 (c) 720 J (d) 720 kJ DMRC JE 20.02.2020 Ans. (c) : Given that, i = 2A t = 10s Ans. (d) : Given that, H = 2.3kJ = 2.3×103J P 100W t 2hr 2 3600 2 H = i Rt t = 7200 Sec H 2.3 103 Energy = Power × time R 2 57.5 E P t it 4 10 Voltage drop = iR E = 100 × 7200 (V) = 2×57.5=115V E = 720 kJ Network Theory 17 YCT 24. A 100-watt light bulb turned on for 8 hours 28. A 17 inch personal computer used used: approximately 150 watts in an hour. If you (a) 80 Wh (b) 0.8 kWh have same computer on for only 4 minutes (for (c) 8 kWh (d) None of the above checking e-mail) what would be the power BWSSB Code 222, 26.05.2017 consumption? DGVCL JE 2016 (a) 0.1 kW (b) 0.04 kW Ans. (b) : Given, (c) 0.01 kW (d) None of the above 100 DGVCL JE 2016 P = 100 Watt = kW = 0.1 kW Ans. (c) : The computer use 150 W/h 1000 If it is operate only 4 minutes t = 8 hour the power is P = ? E=? 60 min 150 W Energy E Power time 150 1 min kWh kW [Hour] 60 150 Total Energy consumed by the bulb E P t kWh 4 min 4 10W 60 E = 0.1 8kWh 10 0.01 kW E 0.8 kWh 1000 29. One kilowatt-hour is? 25. About how many times longer would a 10 watt (a) 3.6 mega joules (b) 2.6 mega joules light bulb be able to burn compared to a 100 (c) 1.6 mega joules (d) None of the above watt bulb with the same energy? DGVCL JE 2016 (a) 10 times longer (b) 100 times longer Ans. (a) : 1 kWh = 1000×3600 Joules (c) Same time (d) None of the above = 3.6×106 Joules DGVCL JE 2016 = 3.6 mega Joule 100 watt 30. 1 Joule of electrical energy equals: Ans. (a) : 10 10 watt (a) 1 watt. sec (b) 1 watt Hence 10 times longer a 10 watt light bulb be able to (c) 1 watt/sec (d) 1 volt ampere burn compared to a 100 W bulb with same energy. DMRC JE 2018, Shift-I Ans. (a) : Energy consumed in electrical power system 26. Capacitance is the ability of a body to store an is- _________. E=P×t (a) Electrical charge (b) Electric current Joule = watt.sec (c) Voltage (d) All of the above 1 Joule = 1 watt.sec DGVCL JE 2016 31. A varistor is made of: Ans. (a) : Capacitance is the ability of a body to store (a) Copper an electrical charge. (b) Carbon film Q CV (c) Carborundum crystals Q (d) Aluminium C V DMRC JE 2018, Shift-I Where, Ans. (c) : A varistor is an electronic component with-an C = Capacitance electrical resistance that varies with the applied voltage. Q = Charge It is made of carborundum crystals. It is also known as V = Voltage voltage dependent resistor. Silicon carbide is also In other words, capacitance is a measure of charge per known as corborundum crystal. unit voltage that can be stored in a capacitor. 32. The value of resistance R in the following 27. The SI unit of energy is: circuit is (a) Joule (b) Newton (c) Coulomb (d) Henry DGVCL JE 2016 Ans. (a) : The SI unit of energy is Joule. (a) 10.0 (b) 7.5 commercial unit of energy is Kilo watt hour (c) 5.0 (d) 2.5 1 kWh = 1000 watt × 60×60 sec. MGVCL JE 30.07.2021, Shift-III = 3.6 × 106 watt sec. PSTCL JE 02.08.2021 = 3.6 × 10 6 J GSSSB SI 08.04.2018 Network Theory 18 YCT Ans. (b) : So, VAB 100V 10 and 10 resistance in parallel– R1 = 10 || 10 10 10 35. For a given conductor, if the cross-sectional 5 area increases, then: 20 (a) resistance of the conductor increases (b) resistance of the conductor decreases (c) current rating of the conductor decreases (d) resistance of the conductor does not change DMRC JE, 26.02.2020 Same current flow in the circuit the value of CPCL JE 2019 resistance. Ans. (b) : R V A I R eq Resistance is inversely proportional to the cross sectional area of the conductor. 100 Hence, if the cross sectional area increases then 8 R 5 resistance of conductor decreases. 8R 40 100 36. A circuit consist of four resistors (5, 10, 8R 60 20, 30) connected in parallel and supplied R 7.5 by a dc source of 100V. Which resistor among 33. Two resistors of 4 and 6 are connected in the four in the above circuit has least value of series and supplied by 50V dc. What is the current? voltage across 6 resistor? (a) 30 (b) 5 (a) 50V (b) 20V (c) 10 (d) 20 (c) 10V (d) 30V DMRC JE, 26.02.2020 DMRC JE, 26.02.2020 Ans. (a) : V= IR Ans. (d) : Given, R1 4, R 2 6 , Vs = 50V 1 I By voltage divider rule, R Voltage across 6 resistor So, If the resistance value is more than the current less. R2 Hence, in 30 resistance minimum value of current flows. V2= Vs 37. What is the relation between resistance (R1and R1 R 2 R2) of two bulbs rated for the same voltage and 6 having powers of 400 W and 100 W = 50 = 5×6=30V 46 respectively? 34. In the circuit shown below, if the resistor 3 (a) R1=4R2 (b) R2=4R1 across the terminals (A-B) is disconnected, then (c) R2=2R2 (d) R2=2R1 find the voltage (VAB). DMRC JE, 26.02.2020 Ans. (b) : Given that, P1 = 400W, P2 = 100W 2 V P R If rating of bulb is same- 1 (a) 100V (b) Zero P R (c) 50V (d) 150V DMRC JE, 26.02.2020 P1 R 2 So, Ans. (a) : When, 3 resistor is disconnected from P2 R1 circuit, then circuit act as an open circuit at terminal A 400 R 2 and B. Then voltage across the terminal A and B is R 2 4R 1 100 R1 equal to supply voltage. Network Theory 19 YCT 38. Two equal resistors are first connected in series 41. Estimate the resistance of the filament of a 50 and then in parallel across a dc supply. What is W, 100 V bulb. the ratio (series circuit to parallel circuit) of (a) 200 (b) 100 total heat dissipated by the resistors for the (c) 50 (d) 150 two cases at a given time? ESIC JE 2019 DMRC JE 2018, Shift III (Assume that the current from the dc source is APTRANSCO Sub. Engineer 2012 same in both cases.) Ans. (a) : Given that, P = 50W, V = 100V, R = ? (a) 2:3 (b) 1:2 (c) 4:1 (d) 3:2 V2 As we know that R DMRC JE, 26.02.2020 P 2 Ans. (c) : Assume current from dc source is same in R 100 10000 , R 200 both (series & parallel) case is same- 50 50 For series connection- 42. Two filament lamps rated 200 W/200 V and 50 Req = R + R = 2R W/200 V are connected in series across a 200 V, Heat dissipated H1 = 2i2Rt 50 Hz, ac supply. Then, the total power supplied by the source is: (a) 160 W (b) 80 W (c) 20 W (d) 40 W For parallel DSSSB JE 05.11.2019 R Ans. (d) : Given that, Req 2 V1 200V, V2 200V P1 200W, P2 50W Resistance of first filament lamps V2 R R1 1 Heat dissipated H 2 i 2 t P1 2 2 H1 2i 2 Rt 4 R1 200 H1 : H 2 4 :1 200 H 2 i 2 Rt 1 R1 200 2 and resistance of second filament lamps 39. Capacitance of a capacitor is given by: 2 d A V22 200 (a) C 0 r (b) C R2 800 A d P2 50 A 0r A If both lamps are connected in series then, (c) C (d) C 2 d d P= V2 = 200 Vizag Steel MT 13.12.2020 R total 800 200 DMRC JE 2018, Shift III 2 Ans. (d) : The capacitance of a parallel plates capacitor P 200 40W can be given by- 1000 0r A 43. A battery having an open circuit voltage of 2 V C d has a terminal voltage of 1 V when supplying a Where, 0 Absolute permittivity current of 5 A. Its internal resistance is: (a) 0.6 Ω (b) 0.4 Ω r Relative permittivity (c) 0.2 Ω (d) 0.1 Ω A = Area of each plate DSSSB JE 05.11.2019 d = Distance between plates Ans. (c) : Given, Capacitance is measure in Farad. Open circuit voltage = 2V 40. An ideal voltage source is one which has: and terminal voltage = 1V (a) infinite internal resistance supply current (I) = 5A (b) zero internal resistance 2 1 1 (c) very high internal resistance Internal resistance (R) = 0.2 5 5 (d) very low internal resistance UKSSSC JE 10.01.2021 44. Three resistances are connected in parallel. Total HPSSC JE 18.07.2021 circuit current is 6A. Individual conductance of HPPSC Lecturer 06.07.2021 each parallel circuit are G1 = 1S, G2=3S and DMRC JE 2018, Shift III G3=2S. Then, current through G3 is: Ans. (b) : An ideal voltage sources is one which has (a) 4 A (b) 1 A zero internal resistance whereas an ideal voltmeter has (c) 6 A (d) 2 A infinite internal resistance. DSSSB JE 05.11.2019 Network Theory 20 YCT Ans. (d) : Given, (a) 12 W (b) 6 W G1 1S, R1 1 (c) 3 W (d) 9 W DSSSB JE 05.11.2019 1 G 2 3S, R2 Ans. (c) : 3 1 G 3 2S, R 3 where S = Siemens 2 These resistance are connected in parallel- 1 1 1 1 R eq 9 9 9 Req = 3 1 Current through is- Power delivered by the source is- 2 V2 1 P 6 R 4 [By current division rule] 2 1 1 P 3 2 4 3 6 9 P 3 4 = 2A P=3W 3 4 47. A wire has a resistance of 12 ohms. It is bent in 45. Certain number of resistors having equal the form of an equilateral triangle. The resistances offers an equivalent resistance of effective resistance between any two corners of 1Ω when connected in parallel and 100Ω if the triangle is they are connected in series. Then, the number (a) 8/3 (b) 12/3 of resistors and the resistance of each are ____. (c) 2 (d) 10/3 (a) 20, 10 Ω (b) 5, 20 Ω APTRANSCO Sub. Engineer 2012 (c) 20, 5 Ω (d) 10, 10 Ω Ans. (a) : Since the resistor of the wire has 12 if it is bent to form an equilateral triangle then- DSSSB JE 05.11.2019 Ans. (d) : Let the number of resistors are n and the 12 Each arm resistance = =4 R length resistance of each resistor are R. 3 When they are connected in parallel- R Rp n R 1 n R = n............................(i) The effective resistance between terminal A-B two When they are connected in series- corner is– Rs = nR = 100 Put the value of R in equation (i) R eq 4 4 4 8 / 3 n.n = 100 4 4 4 n2 = 100 48. Find Req for the circuit shown below: n = 10 Put the value of n in equation (i) R = 10 46. In the circuit shown below power delivered by the source is: (a) 10 (b) 8 (c) 10 (d) 14.4 ESIC JE 2019 Network Theory 21 YCT Ans. (d) : Given circuit diagram - Ans. (a) : Given circuit diagram:- From the circuit diagram- R eq {(4 5 3) 4} 3 6 4 3 12 4 = 3 6 7 R eq = (6 3+2 ) 1 5 4 8 12 4 6 3 66 = 3 3 6 7 = 7 = 3+7 6 3 2 6 12 66 46 R eq 10 12 46 51. What does the below symbol represent? 24 120 144 10 10 R eq 14.4 (a) Transformer (b) Capacitor (c) Resistor (d) Inductor 49. If three capacitors of 10 F are connected in ESIC JE 2019 series, then find the equivalent capacitance. Ans. (d) : Given symbol- (a) 10 F (b) 30 F (c) 3/10 F (d) 10/3 F ESIC JE 2019 Given symbol represents an inductor. Inductor is a Ans. (d) : Given C1= C2=C3= 10F connected in series device that store the energy in magnetic field. If a coil Ceq = ? have N number of turns and current flow through it is 'I' then inductance can be given by- N L I 52. 1 megawatt = ________ watt. (a) 103 (b) 106 5 Equivalent capacitance when they are connected in (c) 10 (d) 104 series is calculated by- ESIC JE 2019 Ans. (b) : Megawatt is the unit of power and it is equal 1 1 1 1 to 106 watt i.e Ceq C1 C 2 C3 1 megawatt 106 watt 1 1 1 1 3 Similarly 1 k W 10 watt C eq 10 10 10 53. Which of the following is an example of vector 1 3 quantity? C eq 10 (a) Magnetic flux density (b) Speed (c) Power (d) Temperature 10 ESIC J
