Set-01 Electrical/Electronic Engineering Reviewer Material PDF

UPDA Electrical/Electronic Engineering Reviewer Material No. 01 1. An alternator is said to be over excited when it is operating at: A. Unity power factor B. Leading power factor C. Lagging power factor D. Lagging to leading power factor 2.A synchronous motor is said to...

UPDA Electrical/Electronic Engineering Reviewer Material No. 01 1. An alternator is said to be over excited when it is operating at: A. Unity power factor B. Leading power factor C. Lagging power factor D. Lagging to leading power factor 2.A synchronous motor is said to be over excited when it is operating at: A. Unity power factor B. Leading power factor C. Lagging power factor D. Lagging to leading power factor 3. A micro antenna is: A. Integrated antenna B. Long Antenna C. Short Antenna 4. What is primary use for fast track scheduling: A. To decrease the cost of construction B. To decrease the cost of professional services C. To avoid future cost increase D. To guarantee project cost prior to the start of building 5. In Harvard Architecture: A. Code and data spaces are merged B. Code and data spaces separated C. Code space is contained in ROM and data space is contained in RAM D. Code space is contained in RAM and data space is contained in ROM 6. The direction of the force acting on a moving charge place in a magnetic field is: A. Perpendicular to the magnetic field B. Opposite to the direction of motion of the charge C. Along the direction of the magnetic field D. Along the direction of motion of the charge 7. The unit of conductance is: A. per ohm B. ohm/m C. mho/m D. mho 8. ABET Stands for Accreditation Board for Engineer and Technology? A. True B. False Page 1 of 18 9. For the circuit shown phase shift of the transfer function V/Vo at very high frequencies is: A. 90° B. 0° C. -90° D. -180° 10. The third harmonic of the Fourier series for the waveform in the figure has a frequency (Hz) of: A. 250 B. 750 C. 4712 D. The third harmonic does not exist. 11. The wire placed on the top of a transmission line is a: A. Phase wire B. Neutral wire C. Transmission wire D. Ground wire 12. Consider the three-stages r-f amplifier shown below ARI refers to the input amplifier stage. AR2 to the second stage, AR2 to the second stage and AR3 to the output stage. For this amplifier configuration the total noise figure (DB) is most nearly: A. 6.6 B. 8.6 C. 10.5 D. 12.3 Page 2 of 18 13. Of the following engineering disciplines, who would be BEST suited to design and operate an automobile factory? A. Petroleum Engineer B. Mechanical Engineer C. Civil Engineer D. Chemical Engineer 14. Which of the following describes the leakage flux flux? A. A flux outside the core B. Flux linking the primary C. Flux linking the secondary D. Flux other than the mutual flux 15. Fast Tracking in Project means? A. Start the project before the design complete B. Fixed cost-plus fee C. None 16. We have three resistance of values 2 , 3 , 6. Which of the following combination will give an effective resistance of 4 ? A. All the three resistance in parallel B. 2 resistance in series with parallel combination of 3 and 6 resistance C. 3 resistance in series with parallel combination of 2 and 6 resistance 17. This question investigates the performance of the temperature sensor shown below. The temperature sensor is linear with the following circuit voltages: Vs = 0 mV at 0°C Vo = 100 mV at 100°C The operation amplifier (op amp) is ideal. At 100°C, the maximum output voltage at Vo/Vs due to the tolerances in Rz is most nearly: A. 2.5 B. 5.2 C. 7.4 D. 10.1 Page 3 of 18 18. The condition for successful parallel operation of transformer is: A. Correct polarity B. Per unit impedance based on their rating should be equal C. Identical voltage and frequency rating D. Equal ratio of equivalent resistance to reactance E. All of these 19. The output of a NOR gate is HIGH if ____________. A. all inputs are HIGH B. any input is HIGH C. any input is LOW D. all inputs are LOW 20. Digital telecommunication equipment provides connection oriented AND/OR connection less service, connection-oriented service is provided by: A. ATM B. ETHERNET C. FDDI D. SMDS 21. Commercial AM Modulation technique is: A. DSB-SC B. DSB-LC C. QAM D. SVAM 22. For last switching of an NMOS R R-pull up inverter (W/L) should be: A. Large B. Small C. Equal to the drain current D. Equal to the power dissipated during switching 23. -time operating system. At a minimum a kernel should provide: A. Task management, file management, memory management B. Task scheduling, task dispatching, file management C. Inter-task communication, task dispatching, memory allocation D. Task scheduling, task dispatching, inter-task communication. 24. A certain communication signal uses a bandwidth BW of 2kHz. What is the classification of this signal? A. Voice grade VHF B. Narrowband VLF C. Voice grade HF D. Wide band UHF Page 4 of 18 25. In an induction motor, no load the slip is generally: A. less than 1% B. 1.5% C. 2% D. 4% 26. Minimum voltage regulation occurs when the power factor of the load is: A. unity B. lagging C. leading D. zero 27. In medium sized induction motors, the slip is generally around: A. 0.04% B. 0.4% C. 4% D. 14% 28. The manufacturing company gets materials from 2 suppliers X & Y. If X delays the procurement of materials by 2 days and company take 10 days to obtain the material, what shall be the delays (days) for product completion? A. 0 B. 1 C. 2 D. 3 29. If an alternator is over excited: A. PF is lagging B. PF is leading C. Is Unity D. Is zero Rejection of Noise 30. The input impedance of cascade amplifier will: A. Same as input impedance of first B. Same as output of second C. Same as the entire circuit D. Same as stage before the last stage Page 5 of 18 31. Rotor of Induction motor is rotating at synchronous speed. What is Torque? A. High B. Low C. Zero D. Infinity 32. What does the power factor stand for? A. Cosine of the angle between the voltage and current B. Sine of the angle between the voltage and current C. Tangent of the angle between the voltage and current D. Cotangent of the angle between the voltage and current 33. What is the minimum gauge size of the earthing cable? A. 20 B. 16 C. 10 D. 8 34. To get rid of DC offset use? A. Low pass filter B. High pass filter C. Band pass filter D. Stop band pass filter 35. For forward biasing: A. Anode 3V cathode 7V B. Anode 5V cathode 3V C. Anode 7V cathode 10V 36. Transformer resistivity: A. High voltage higher than low voltage B. High voltage lower than low voltage C. High voltage equal to low voltage 37. Amplifier working with good gain in: A. Reverse region B. Cutoff region C. Active region D. Saturated region 38. What is MOSFET? A. Transistor B. Thyristor C. Amplifier Page 6 of 18 39. To minimize loading effect use? A. Resistance B. Capacitors C. Inductors 40. Alternator connected on no load condition, what affect the efficiency? A. Speed B. Voltage C. Armature losses 41. Transformer saturation: A. High efficiency, low no load losses B. Low efficiency, low no load losses C. Low efficiency, high no load losses D. High efficiency, high no load losses 42. What will be the output impedance of cascade amplifier to minimizes the loading effect? A. High B. Low C. Intermediate D. No effect 43. Uninterruptible Power System has to be connected to the network by: A. Series to feed electrical power at normal time B. Parallel to feed electrical power at normal time C. Series to feed electrical power at critical time D. Parallel to feed electrical power at critical time 44. What is the purpose for the neutral line at the 3-phase power system? A. As return path for the normal current B. As return path for the normal voltage C. As return path for fault current D. As return path for fault voltage 45. An engineer received new scope of work which is not included at the original scope, what the action he has to do? A. Accept the scope and start for supplying the materials B. He has to inform his boss first C. Refuse to receive the new scope 46. An active filter will: A. Amplify B. Filter and Amplify C. Amplify/Filter/Modulate Page 7 of 18 47. Embedded system should have best: A. Dynamic response B. Static response C. No response 48. If gain of amplifier is 10 and having negative feedback of 9%. What will be the gain if feedback is remove? A. 10 B. 90 C. 100 D. 1.2 49. Humming of transformer is due to: A. Vibration of winding coil B. Vibration of brushes C. Vibration of laminated core 50. I = 5 Cos wt + 2 Cos wt, R=3 Ohms, Find the wattage: A. 44 Irms = ((Idc2 + (Im12+Im22+---------+Imn2/2))0.5 =((52+42)/2)0.5 = 3.807A B. 78 P = 3.8072 * 3 = 43.48 W C. 147 51. A 1000m cable is terminated with a short circuit at the far end. The first reflected wave appears 9.43µs after the incident wave. The actual velocity in the cable divided by the speed of light is: Vp = 2L/To A. 0.35 B. 0.71 C. 1.0 D. 1.41 52. High voltage winding of transformer has ________ resistivity than the low voltage side. A. Lower B. Higher C. Equal D. Lower or Equal 53. Three 30µF capacitors are connected in star (Y) form between the terminals A, B, C and a junction point N as shown in the figure, the capacitance (µF) between terminals A and B is most nearly: A. 2/30 B. 15 C. 30 D. 60 54. The output D in the circuit is: Page 8 of 18  A. B(A+C) B. (A+B) (B+C) C. AB + BC D. (A+B) CB 55. Power consumption in the advanced embedded system is: A. 10% B. 50% C. 80% D. None of the above 56. Calculate the Vout: A. 1.1V B. 2.2V C. 4.3V D. 5V 57. Harmonics in a system is mainly due to: A. Variable Impedance Load B. Saturated Magnetic Load C. Power Electronics Load D. All of the above 58. Main objective of transmission system: A. Reliability B. Voltage regulation C. Power factor D. Efficiency 59. Which of the following parallel resistance will have the highest value of the equivalent resistance? Page 9 of 18  A. 10 kOhm and 25kOhm B. 1 kOhm, 2 kOhm and 3 kOhm C. Two 500 kOhm resistors D. Four 40 kOhm and two 10kOhm resistors 60. In the receiver of a wireless system, we must amplify the received signal using: A. A power amplifier B. A differential amplifier C. An active filter D. A low-noise amplifier 61. An overcurrent relay is used to protect a circuit with a maximum 3-phase fault current of 8000A. Primary A 400:5 current transformer ratio and a 5A relay tap setting are selected. If the total secondary burden on the current transformer for the maximum fault condition is 1:10 , the excitation voltage (V) that must be developed by the current transformer is most nearly: A. 100 Excitation Voltage (V) = Is*(Rs+Rb),Is = 8000*(5/400) = 100 A,Rs =SecondaryR of 400/5 CT=0.2 B. 110 Rb = 1 ohm, V = 100 (1+0.2) = 120V C. 115 D. 120 62. In the 3-phase system, the neutral is: A. Normal return path for the current B. Abnormal return path for the current C. A and B D. None of the above 63. Which circuit breaker is used at distribution level? A. Air circuit breaker B. Air blast circuit breaker 64. Open circuit test on transformer is conducted to obtain: A. Ohmic loss only B. Hysteresis loss only C. Eddy current loss only D. Core loss only 65. The electric flux passing out through a closed surface is equal to: A. The line integral of the surface B. Zero C. The flux density at the surface D. The total charge enclosed by the surface E. The net surface integral of the current Page 10 of 18 66. The output is to be maintained at 24V, while the input varies from 120V to 126V with a load current ranging from 0A to 5A. Assume ideal conditions, that is the keep alive current is zero and the Zener resistance RZ is negligible: What is the minimum power of the supply resistor? A. 400 B. 450 C. 500 D. 550 67. On the question above, what is the minimum diode power rating that can be used? A. 100 B. 150 C. 500 D. 600 68. On the question above, what is the required supply resistance to ensure proper operation of the Zener regulator circuit? A. 19 B. 22 C. 24 D. 25 69. On the question above, what is the Maximum Zener current? A. 4.1 Amps B. 4.3 Amps C. 5.1 Amps D. 5.3 Amps 70. Find the total float of activity D for the project: A. 1 B. 3 C. 9 D. 2 Page 11 of 18 71. The self-discharge rate of a lead-acid battery is least dependent on which of the following factors? A. concentration (specific gravity) of electrolyte B. age of battery C. temperature D. nominal voltage of battery 72. The minimum standard wire gauge of earth wire is: A. 20 SWG B. 16 SWG C. 10 SWG D. 8 SWG 73. The unit of current is: A. Ampere B. Watt C. Volt D. _________ (Any other write here) 74. The most economical method of starting a single-phase motor is: A. Split-phase method B. Resistance start method C. Inductance start method D. Capacitance start method 75. In the circuit shown, which resistor(s) is (are) redundant? A. R1 only B. R1 and R4 C. None 76. A copper cable used in a plain old telephone service line has a loss of 1.5 dB/km. What is the approximate loss experienced if the user is located 1.5km from a central office? A. 1.5 dB B. 15 dB C. 20 dB D. 220 dB Page 12 of 18 77. A lossy transmission line is used to connect a transmitter to an antenna. If the VSWR measured at the antenna end of the transmission line is 1.5, which of the following statement is correct? A. The VSWR measured at transmitter end of the transmission line is smaller than 1.5 B. The VSWR measured at transmitter end of the transmission line is greater than 1.5 C. The VSWR measured at transmitter end of the transmission line is equal to 1.5 D. The characteristic impedance of the antenna matches exactly the character impedance as the transmission line 78. Which of the following characteristics is not typical of a project manager: A. Managing a temporary activity B. Possesses in depth technical knowledge C. Managing a non-repetitive activity D. Manages independently of the formal organization 79. The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be: A. 10 B. 1.25 C. 100 D. 90 80. A de current of 50A is flowing in an isolated wire. The magnitude of the magnetic field intensity, H (A/m), 10cm from the center of the wire is: H= I/2 r A. 0.05 B. 8 C. 43 D. 80 81. Which type of braking is used in an induction motor: A. Regenerative B. Dynamic C. Plugging D. All of the above 82. What is the common or usual method to ensure that the final set of construction documents satisfy the clients program and design goals? A. Make a checklist program requirement for the staff working on the project of use to continuously monitor their progress as they prepare the drawings. B. Have the client review a final check set for compliance with the program requirements and request that any corrections be noted. C. Have another architect who is unfamiliar with the project review the final set for compliance with the original program requirement. D. Hold regular progress meetings with the client and staff involved to compare the current status of the drawings with the original program requirements. At the conclusion of this phase, require that the client provide the architect with written approval to proceed to the next phase. Page 13 of 18 83. In a cascade amplifier, to reduce the loading effect at the output, the output impedance of the last stage should be: A. Very high B. Intermediate C. Very small 84. In a cascade amplifier, to reduce the loading effect at the input, the input impedance of first stage should be: A. Very high B. Intermediate C. Very small 85. In which of the following circuit will the voltage source produce the most current: A. 10 Volt across a 10 Ohm Resistance B. 10 Volt across two 10 Ohm Resistance in Series C. 10 Voltage across two 10 Ohm resistance in parallel D. 1000 V across 1 MOhm resistance 86. Which of the following theorem is used for frequency? A. Kirchhoff B. Muller C. Shannon Theorem 87. The main cause of transformer humming is: A. Vibrations in the insulating and cooling oil B. Vibrations in the core lamination C. Vibration in the bushes D. None of the above 88. If the induction motor speed at no-load is 745 RPM, what is the speed of the motor? A. 700 RPM B. 750 RPM C. 800 RPM D. 850 RPM 89. Synchronous speed for motor 1600 RPM, 60hz, Calculate number of poles. A. P = 2 B. P = 4 C. P = 6 90. At what region of operation is the base emitter junction forward biased and the based collector junction reverse biased for BJT? A. Saturation B. Linear or active C. Cut-off D. None of the above Page 14 of 18 91. What is the role of the Zener diode? A. Rectification B. Voltage regulation C. Amplification 92. The heat loss inside a straight conductor is 60J upon applying current I for 5s. If the resistance of the conductor is decrease to half, and the same current is applied for 5s, what will be the heat dissipation? A. 60J B. 30J C. 15J D. 120J 93. Why we use power factor correction device to: A. Mitigate PF B. Increase PF C. Getting PF D. None of the above 94. Rotor of induction motor is rotating at synchronous speed, what is torque? A. High B. Low C. Zero D. Infinity 95. The underground cable is laid in a marine environment at system voltage A. What shall be the design of the cable insulation? A. B. C. D. 2 A 96. Cable length is 1000m, time of returning signal is 9.43µsec. What is the speed of wave in the cable? A. 0.35 B. 0.75 C. 1 D. 2.1 97. An antenna has an effective aperture of 10m². What additional information is required to determine the amplifier power? A. Power density B. Power loss C. Space loss D. Total aperture Page 15 of 18 98. 10HP Single phase motor, 0.8 PF, 240V, Efficiency = 0.6, What is the current? Hint: Pout = n V I cos Ø A. 70 A B. 52.5 A C. 64.76 A D. 90 A 99. Which of the following is not opportunity to do the project? A. Demand of the product B. Emerging markets C. Lot of Manpower D. Favorable exchange rated E. None of these are Organizational opportunities 100.For the shown block diagram, what is the dumping ratio O/P / I/P = U/R where S = 1? A. 0.4 B. 0.63 C. 0.7 D. 2.82 101. An alternator is operating at __________ for capacitive loads. A. Lagging power factor B. Unity power factor C. Leading power factor D. None of the above 102. The activity on node networks shown below describes a project consisting of 8 task A-H. Each node indicates duration in weeks relationship are finish-to-start. The minimum time to complete the project is: A. 15 weeks B. 16 weeks C. 17 weeks D. 18 weeks 103. A super heterodyne AM receiver within an intermediate frequency (IF) of 455 kHz is to be turned to listen to a station at 540 kHz. What tuning frequency is used in the local oscillator? A. 96 kHz B. 540 kHz C. 550 kHz D. 995 kHz Page 16 of 18 104. For which of the following topologies can 10BaseT not be used without additional hardware conversion? A. Star B. Tree C. Point to Point D. Bus 105. High voltage windings of transformer have _________ resistivity than the low voltage side. A. Lower B. Higher C. Equal D. Lower or Equal 106.ACR of conductor have 7 steel wires and 25 aluminum wires can be specified as: A. 7/25 B. 7/32 C. 32/7 D. 25/7 107. The output D in the circuit is: A. B(A+C) B. (A+B) (B+C) C. AB + BC D. (A+B) CB 108.Cable length is 1000m, time of returning signal is 9.43µsec what is speed of wave in the cable? A. 0.35 B. 0.75 C. 1 D. 2.1 109.The equivalent circuit of induction machine at no load is the same as that of the transformer but with A. Open circuited secondary B. Short circuited secondary C. Open circuited primary D. Short circuited primary 110. Which of these is not a rule of interaction? A. Law B. Etiquette C. Morals D. Communication E. Ethics Page 17 of 18 111. Within the battery, conventional current flow is A. Anion to Cation C. Positive electrode to Negative electrode B. Cation to Anion D. Anode to Cathode 112. Activity on arrow needs to use dummy activities to avoid precedence problem that can happen due to: A. Parallel Activities D. Burst Activities B. Critical Path Activities E. Independent Activities C. Merge Activities F. None of the above 113. What is the average value of signal v(t) = 5 sin377t A. 2.8 D. 3.8 B. 3.2 Vavg = 5 * 0.636 = 3.2V C. 3.5 114. A 3 phase transformer, 25MVA, 66-12.47kV, delta-wye connected, 8 percent impedance. On the 100 MVA, per unit impedance is most nearly A. 0.08 D. 0.32 B. 0.16 Zpu = Zpuold * (MVAnew/MVAold) = 0.08 * (100/25) = 0.32 C. 0.24 115. and the voltage Range 0-100V. What type and magnitude of resistance required? Hint: 1/Ifs = (Rext+Rcoil ) / Vfs A. Parallel, 1M ohm B. Parallel, 1K ohm C. Series, 1M ohm D. Series, 1K ohm 116. The offset of a particular segment varies from A. 000H to FFFH B. 0000H to FFFFH C. 00H to FFH D. 00000H to FFFFFH 117. The power gain of 30dB is equivalent to which amplification factor A. 0.001 B. 1/30 dB=10logx, 30= 10 logx, logx= 30/10 = 3, x=103 = 1000 C. 30 D. 1000 P1 [dB] = 10log (Power) P2 Page 18 of 18