UPDA Electrical/Electronic Engineering Reviewer Material No. 03 PDF

UPDA Electrical/Electronic Engineering Reviewer Material No. 03 1. Given data is Ambient Temperature is 65⁰C (k value is 1.38 x 10-23) Frequency is 10 kHz Resistance is 100 Ohms Formula is given as hint Vnoise = root over 4kTR (BW-f): A. 1....

UPDA Electrical/Electronic Engineering Reviewer Material No. 03 1. Given data is Ambient Temperature is 65⁰C (k value is 1.38 x 10-23) Frequency is 10 kHz Resistance is 100 Ohms Formula is given as hint Vnoise = root over 4kTR (BW-f): A. 1.9 microV B. 1.0 nV C. 1.9 nV D. 0.1 microV 2. 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 3. In conducting a power-flow (or load flow) study using conventional iterative calculation, which of the following statements is most nearly correct? A. One bus is designated as a slack bus, and the others are designated as voltage-controlled buses or load buses. B. One bus is designated as a voltage-controlled bus, and the others are designated as slack buses or load buses. C. One bus is designated as a load bus, and the others are designated as voltage-controlled buses or slack buses. D. There may be any number of slack buses, voltage-controlled buses, and load buses designated, as long as they total the number of buses in the network. 4. Which of the following engineer do the tests for the reliability and sustainability? A. Production Engineer B. Research Engineer C. Testing Engineer 5. Which one of the following is not correct based on Ohm’s Law? A. Potential / Current = Constant B. Current / Potential = Constant C. Current = Potential x Resistance D. Potential = Current x Resistance 6. The room amplifier in a wireless system amplifies: A. The baseband signals B. The modulated signal only C. The encoded and modulated signal D. The received signal Page 1 of 18 7. Harmonic currents present in a power system may cause: A. Excessive heating B. Malfunctioning of the control and regulating circuits C. Resonance D. All of the above 8. We have three resistance each of 1 Ohm. How many different values of resistance can be obtained by different series-parallel combinations if all the three resistance are to remain in the circuit? A. 3 B. 4 C. 5 D. 6 9. The wind load LSi in Newton’s on an overhead line structure is calculated using the following formula. Lsi = 0.613v2 m/s KzGRF / CfAm2. What does the Kz term represents? A. Force Coefficient B. Guest Response Factor C. Velocity Pressure Coefficient D. Wind Speed 10. The resistance of 100W, 200V tamp is: A. 100 ohms B. 200 ohms C. 400 ohms D. 1600 ohms 11. Consider the oscillator circuit shown below. The circuit uses which resonant modes of the crystal X1: A. Series Resonant B. Parallel Resonant C. Series-Parallel Resonant D. Non-Resonant 12. The OP-AMP circuit shown performs the function of: A. Simplification B. Integration C. Differentiation D. Summing E. Attenuation Page 2 of 18 13. What is the best economical way to start a single-phase motor? A. Resistive method B. Inductive method C. Capacitive method D. None of the above 14. Strength of Materials? A. Ability to withstand external forces B. Ability to withstand internal forces C. Ability to withstand pressure D. Ability to withstand an applied load without failure or plastic deformation 15. For which of the following circuits elements is superposition valid? A. Independent source B. Dependent source C. Charged capacitor D. Inductor with I Initial not equal to zero 16. What is the difference between EPROM and EEPROM? A. EEPROM is volatile and EPROM is non-volatile. B. EEPROM is erased by exposing ultraviolet and EPROM by electrically. C. EEPROM/EPROM both are same. D. EEPROM is used for Operating systems storage and EPROM is for computer constants required for systems start-up. 17. Why steel is used in concert structure because? A. it is cheap B. good bond C. highly rigid D. temperature expansion coefficient is same with cement/concrete 18. For a 12AWG wire we should use CB rating: A. 10A B. 15A C. 20A D. 30A Hint: 14 Gauge Wire: 15 amps CB 12 Gauge Wire: 20 amps CB 10 Gauge Wire: 30 amps CB 19. If fuse rate = 8 Ampere, what does mean? A. It will not work if current is less than B. It has a resistance of 8W C. It will work only if current is 8A D. It will melt if current exceeds 8A Page 3 of 18 20. CMOS Inverter is superior to the R-Pull up inverter due to: A. High impedance B. Smaller propagation delay C. Symmetric transfer characteristics D. Asymmetric transfer characteristics 21. The delay time for a series of activities that would not affect if occurred the project timing called: A. Total Slack (Total Float) B. Total Slag C. Critical Float D. Float Pad E. Critical Slag 22. Which one of the following is not describes ceramic? A. Crystallizers B. High Resistivity C. High Conductivity D. Insulator 23. The device used for measuring potential difference is known as: A. Potentiometer B. Ammeter C. Galvanometer D. Voltmeter 24. Among the sites being considered for a new main library are those adjacent to the following areas or services. The most appropriate site is one that is adjacent to: A. A residential neighborhood and recreation facilities B. Mosques and government offices C. Public schools D. Shopping and public transportations 25. Number 34 in the following “N34’ E” usually will be specified with: A. Starting Point B. Traverse C. Bearing 26. Changing in the excitation in grid having an alternator connected to it will having the following effect: A. Change in active component of load B. Change in reactive component of load C. Change in Power Factor of Load D. The frequency of the generated wave form will be affected Page 4 of 18 27. Sensor transducers will transfer: A. Move to electrical signals B. Heat to mechanical signal 28. What is the term of component arrangement for waves in transmitting and receiving? A. Array B. Source C. Dish Antenna 29. A passive filter can: A. filter only B. filter and amplify only C. amplify only D. none of the above 30. Which of the following types of material has high thermal and electrical conductivity? A. Ceramic B. Metal C. __________ (any other write here) 31. V = 50 Cos (40wt + 30) + 28.2 Cos (40wt + 30), R = 5, find P: A. 1025 Erms = ((Edc2 + (Em12+Em22+---------+Emn2/2))0.5 =((502+28.282)/2)0.5 = 40.62V B. 650 P = V2 / R = 1650/5 = 330W C. 330 D. 550 32. The initial investment for a project is 2.0 million QR. A net annual profit of 150,000 QR is anticipated. Using a 10% desired rate of return on the investment what is the payback period for the project? A. 6.84 years B. 4.55 years C. 5.36 years D. 8.89 years 33. Which of the following systems uses Assembly language? A. SCADA B. Microcontrollers C. ASIC D. FPGA E. Both A & B Page 5 of 18 34. Weak power system means: A. Power system with high short circuit capability and low sensitivity to harmonics B. Power system with high short circuit capability and high sensitivity to harmonics C. Power system with low short circuit capability and low sensitivity to harmonics D. Power system with low short circuit capability and high sensitivity to harmonics 35. For the diagram shown, what is the approximate required minimum clearance distance, R, if the phase voltage of the live parts is 13,800V? A. 1.8m B. 2.5m C. 3.0m D. 4.0m 36. Project Control will be: A. Before construction B. During construction C. After construction D. Throughout the process 37. In 50Hz induction machine, if the no load speed is 2900 rpm, the slip frequency is: A. 0.33 Hz N = 120f/P = 3000 B. 0.67 Hz S = 3000-2900/3000 =0.0333 C. 1.33 Hz slip frequency = sf = 0.0333*50 = 1.67Hz D. 1.67 Hz 38. Which of the special purpose diodes formed by a junction between a layer of metals and layer of semiconductor? A. A Schottky diode B. A tunnel diode C. A Zener diode D. A Varactor diode 39. What is the worth after 5 years of an investment of One Million Qatari Riyals if the APR is 9% paid monthly? A. 1,450,000 B. 1,538,634 C. 1,824,320 A = P ( 1+ i/mn)n D. 1,926,248 40. Which is not part of Scope Management? A. Define scope B. Verify Scope C. Execute Scope D. Create WBS Page 6 of 18 41. Process to identify, study, analyze, and rectify root cause of incidents is called: A. Pareto Analysis B. Risk Opportunity Management C. Cause and Effect Analysis D. Quality Control Procedures 42. In the context of time management, which is not a typical type of activity dependency: A. Mandatory dependency B. Discretionary dependency C. External dependency D. Multiple dependency 43. Which is not a resource related to activities: A. Manpower B. Material C. Machinery D. Time 44. Process of decomposing deliverables into smaller, more manageable components is complete when: A. Project justification has been established B. Change request have occurred C. Cost and duration estimates can be developed D. Each work element can be found in the WBS 45. Project life cycle is different than product life cycle in that project life cycle: A. Does not incorporate methodology B. Is different for each industry C. Covers different project D. Describes project management activities 46. Best time to assign a project manager to a project is during: A. Execution B. Initiation C. Monitoring and Controlling D. Closing 47. Scheduling periodic tasks to execute on a processor based on assigning the highest priority to the task that has the shortest period (greatest frequency) is: A. Cyclic executive B. Deadline monotonic C. Earliest deadline first D. Rate monotonic Page 7 of 18 48. The final step in the definition of a work breakdown structure is to: A. Assign codes for each activity of the work package B. Assign the cost account to a manager C. Assign the work package to a manager D. Develop the responsibility matrix E. None of these are included in the final step 49. In transformer saturation: A. The efficiency decreases and the no load current increases B. The efficiency decreases and the no load current decreases C. The efficiency increases and the no load current increases D. The efficiency increases and the no load current decreases 50. When using the method of symmetrical components, which of the following statements is most nearly correct: A. The three zero sequence current phasor are equal in magnitude and displaced by 1200. B. The three positive sequence and the three negative sequence current phase are all equals in magnitude, but have opposite phase. C. In wye connected synchronous generator, the voltage drops through the neutral grounding resistor, R is equal to √3 Io R, where I0 is the zero-sequence current. D. Positive sequence and negative sequence currents cannot pass through the neutral grounding resistor in a wye-connected generator. 51. To make sure that an instrument did not drift with time, we need to: A. Heat it up B. Change it C. Calibrate it D. Put it into higher position 52. What are the most important components of sustainability? A. Economical B. Social C. Environmental D. All are equally important 53. Among the sites being considered for a new main library are those adjacent to the following areas or services. The most appropriate site is one that is adjacent to: A. A residential neighborhood and recreation facilities B. Mosques and governmental offices C. Public schools D. Shopping and public transportation 54. For the design and implementation of smoke detectors and door control system, it is preferable to use: A. FPGAs B. Microcontrollers C. ASIC Page 8 of 18 55. What does QSAS stands? A. Qatar Standards of Architectural Sustainability B. Qatar Sustainability Assessment System C. Qatar System for Assessing Sustainability D. Qatar Sustainability Assessment Standards 56. According to Brundtland Report (WCED, 1987) defining the main attributes of sustainability and sustainable development, what are the three main pillars of sustainable development? A. Economic, Social and Cultural factors B. Economic, Cultural and Environmental factors C. Economic, Environmental and Social factors D. Political, Social and Environmental factors 57. The bode plot for the circuit shown A = V2 / V1, is: A. B. C. D. 58. Project management is ideally suited except: A. Accountability B. Flexibility C. Innovation D. Speed E. Repeatability Page 9 of 18 59. In the circuit below, Switch S1 closes at t = 0. The diode D is rated at a maximum peak current of 5A. Assume that the initial charge on the capacitor is zero. The minimum value of R (n) to prevent exceeding the diode maximum peak current is most nearly: A. 33 B. 24 C. 21 D. 11 R = Vm / Im = 120√2 / 5 = 33.93 60. A circuit breaker is: A. A current interrupting device B. Power factor correcting device C. Harmonics correcting device D. All of the above 61. Which of the following would not be classified as a direct cost? A. Safety and first aid expenses B. Finishing labor for a concrete slab C. Materials for a structural steel frame D. Foundation excavation equipment expenses 62. The assembly language is usually used for programming: A. DSP B. Microcontrollers C. FPGA 63. The term sustainability refers to: A. Maintaining resource use, a at current or higher levels. B. Keeping the natural environment and human society in happy, healthy and functional state. C. Holding or increasing the current quality of human life. D. Always focusing on fulfilling shortage term needs. E. Opposing change from current policies. 64. In circuit 27 is given and along with 52 mentioned: A. Time delay B. Overcurrent function in CB C. Under voltage relay in CB 65. AM radio signal is modulated how? A. Quadrature amplitude modulated B. Quadrated Semi Band Amplitude Modulation C. Dual Modulation with Semi Quadrature form D. One more is there Page 10 of 18 66. Two coils are in series. The H is 4 and mutual inductance value is 0.75. Hint: induction = K: A. 2 B. 4 C. 8 D. 12 67. Which system will cause saturated currents? A. 50 Hz transformer by rated MVA but 60 Hz B. 3 Phase 50 Hz motor by Inverter of rated voltage but half of frequency 68. A battery which factor is least dependent for long self-discharge property: A. concentration of electrolyte B. temperature C. long period D. nominal voltage 69. Transconductance of BJT is: A. dIE / dIC B. VBE / IE C. IE / IC D. Ic / VBE 70. The power factor of an alternator depends on: A. Load B. Speed of rotor C. Core losses D. Armature Losses 71. Induction load running at stability slip is: A. 1 B. 0 72. If an 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 73. Common breakers used in distribution level: A. Air brake circuit breaker B. Air blast circuit breaker C. Oil type D. Vacuum Page 11 of 18 74. Fire Alarm and Smoke Detector is preferable to use: A. Microcontrollers B. ASIC C. FPGA 75. Which transmission voltage is not applicable in Qatar? A. 66 kV B. 132 kV C. 220 kV D. 400 kV 76. Which one is the highest input impedance? A. NPN-BJT B. MOSFET C. Both 77. Embedded System should have best: A. Dynamic response B. Static response C. No response 78. Embedded System working on which platform: A. SCADA B. Microcontrollers C. ASIC D. FPGs 79. Harmonics in system is mainly due to: A. Variable imp load B. Saturated magnetic load C. Power electronic load D. All of the above 80. Reinforce concrete will give: A. High tensile strength B. High compression strength C. Both 81. What is the resistance for 100W and 200V potentials? A. 200 B. 100 C. 400 D. 1600 Page 12 of 18 82. The unit of conductance: A. Ohm B. Ohm/m C. Ohm-m D. Mho 83. The unit of conductivity: A. Ohm B. Ohm/m C. Mho D. Mho/m 84. The unit of resistance: A. Ohm B. Ohm/m C. Ohm-m D. Mho 85. The unit of resistivity: A. Ohm B. Ohm/m C. Ohm-m D. Mho/m 86. A differential relay designed to protect a zone of the distribution system, uses current transformer (CTs) connected to annually CTs. The auxiliary CTs must match both the phase shift and the ratio of the differential relays CTs if the values do not match. Which of the following is the least likely outcome? A. The trip could occur at a lower level than expected. B. The trip could occur at a higher level than expected. C. The trip could occur under a non-fault condition. D. The trip could occur only when the CTs are wired in parallel. 87. A Wrist watch mercury cell has a capacity of 200 x 10 -3 AH. How many months can the watch function without replacement if it draws 15 x 10-6 A? Hint: Dh = I x t A. 9 months B. 18 months C. 24 months Duration = Capacity / current = (200/1000) / (15/1000000) = 13333.33Hrs D. 30 months = 555.55days = 18 months Page 13 of 18 88. The system shown is stable for: A. k > -2 B. –3