electrical engineering MCQs – Page 157

Practise multiple-choice questions from electrical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

electrical engineering Mcqs

1. economics of power generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

3121. Which of the following is measured by using a vector voltmeter ?
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A. Filler transfer functions

B. Amplifier gain and phase shift

C. Complex insersion loss

D. All of the above

3122. When the initial conditions of a system are specified to be zero it implies that the system is________________?
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A. working normally with reference input

B. at rest without any energy stored in it

C. working normally with zero reference input

D. at rest but stores energy

3123. A dynamometer wattmeter can be used for______________?
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A. both D.C. and A.C.

B. D.C. only

C. A.C. only

D. any of the above

3124. An increase in gain, in most systems, leads to_____________?
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A. constant damping ratio

B. larger damping ratio

C. smaller damping ratio

D. none of the above

3125. The power factor of a single phase load can be calculated if the instruments available are_____________?
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A. one voltmeter and one ammeter

B. one voltmeter, one ammeter and one energy meter

C. any of the above

D. one voltmeter, one ammeter and one wattmeter

3126. Which of the following is an open loop control system ?
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A. Stroboscope

B. Ward leonard control

C. Field controlled D.C. motor

D. Metadyne

3127. To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken_______________?
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A. from a source which is not the same as the unknown voltage

B. from the same source as the unknown voltage

C. any of the above

D. from a battery

3128. A controller, essentially, is a________________?
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A. comparator

B. sensor

C. amplifier

D. clipper

3129. On which of the following factors does the sensitivity of a closed loop system to gain changes and load disturbances depend ?
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A. All of the above

B. Forward gain

C. Frequency

D. Loop gain

3130. The capacitance, in force-current analogy, is analogous to_____________?
0

A. displacement

B. mass

C. momentum

D. velocity

3131. With zero volts on both inputs, an OP-amp ideally should have an output _______________?
0

A. equal to the negative supply voltage

B. equal to zero

C. equal to the positive supply voltage

D. equal to CMRR

3132. Which of the following is an essential part of a motor meter ?
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A. Revolution registering device

B. All of the above

C. A braking device

D. An operating torque system

3133. Wagner earthing device is used to eliminate errors due to________________?
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A. electrostatic coupling

B. electromagnetic coupling

C. both A. and B.

D. none of the above

3134. In force-voltage analogy, velocity is analogous to______________?
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A. capacitance

B. current

C. inductance

D. charge

3135. In a single phase power factor meter the phase difference between the currents in the two pressure coils is___________________?
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A. approximately 0

B. exactly 90

C. approximately 90

D. exactly 0

3136. In an automatic control system which of the following elements is not used ?
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A. Sensor

B. Oscillator

C. Final control element

D. Error detector

3137. Which of the following is an electromagnetically device ?
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A. LVDT

B. Induction relay

C. None of the above

D. Any of the above

E. Thermocouple

3138. The input impedance of a differential amplifier equals re times________________?
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A. RC

B. 2

D. RE

3139. Which of the following can be measured by LVDT ?
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A. Displacement

B. Velocity

C. Any of the above

D. Acceleration

3140. By which of the following the control action is determined when a man walks along a path ?
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A. Eyes

B. Hands

C. Legs

D. Brain

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