electrical engineering MCQs – Page 155

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 Review each marked answer and report any item that may be outdated or unclear.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

3081. _______________is a closed loop system?
0

A. Car starter

B. Electric switch

C. Direct current generator

D. Auto-pilot for an aircraft

3082. Pressure error can be measured by which of the following ?
0

A. Differential bellows and straingauge

B. Strain gauge

C. Strain gauge and potentiometer

D. Selsyn

3083. The desirable static characteristics of a measuring system are______________?
0

A. accuracy and reproducibility

B. static error

C. drift and dead zone

D. accuracy, sensitivity and reproducibility

3084. Which of the following statements is correct for a system with gain margin close to unity or a phase margin close to zero ?
0

A. None of the above

B. The system is highly oscillatory

C. The system is highly stable

D. The system is relatively stable

3085. The function of shunt in an ammeter is to______________?
0

A. increase the resistance of ammeter

B. by pass the current

C. none of the above

D. increase the sensitivity of the ammeter

3086. In a Schering bridge the potential of the detector above earth potential is______________?
0

A. 10 kV

B. a few volts only

C. 5 kV

D. 1 kV

3087. _____________is not a final control element?
0

A. Control valve

B. Electropneumatic converter

C. Servomotor

D. Potentiometer

3088. Which of the following statements is correct for any closed loop system ?
0

A. Only one of the static error co-efficients has a finite non-zero value

B. None of the above

C. All the co-efficients can have zero value

D. All the co-efficients are always non-zero

3089. __________ instruments are those which measure the total quantity of electricity delivered in a particular time ?
0

A. Integrating

B. Absolute

C. Recording

D. Indicating

3090. technique gives quick transient and stability response______________?
0

A. Bode

B. Root locus

C. Nichols

D. Nyquist

3091. Which of the following properties a damping oil must possess ?
0

A. Should not have corrosive action upon the metal of the vane

B. Should be non-evaporating

C. All of the above

D. The viscosity of the oil should not change with the temperature

E. Must be a good insulator

3092. A differentiator is usually not a part of a control system because it______________?
0

A. reduces the gain margin

B. reduces damping

C. increases error

D. increases input noise

3093. To measure a resistance with the help of a potentiometer it is_________________?
0

A. necessary to use a volt ratio box in conjunction with the potentiometer

B. none of the above

C. not necessary to standardise the potentiometer

D. necessary to standardise the potentiometer

3094. A __________ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly___________?
0

A. deflecting

B. damping

C. any of the above

D. controlling

3095. In a stable control system backlash can cause which of the following ?
0

A. Underdamping

B. Low-level oscillations

C. Poor stability at reduced values of open loop gain

D. Overdamping

3096. The differential gain is _____________?
0

A. about 100

B. very low

C. dependent on input voltage

D. very high

3097. The output of a feedback control system must be a function of_________________?
0

A. reference and output

B. input and feedback signal

C. output and feedback signal

D. reference and input

3098. The principle on which vector voltmeter is based is_____________?
0

A. that it measures the response of linear ramp voltage

B. that it works on the principle of complex variation

C. that it measures the amplitude of a single at two points and at the same time measures their phase difference

D. same as digital meter

3099. The gravity controlled instrument has crowded scale because current is proportional to________________?
0

A. balancing weight

B. deflection angle

C. sine of deflection angle

3100. When the initial conditions of a system are specified to be zero it implies that the system is______________?
0

A. working normally with zero reference input

B. at rest without any energy stored in it

C. at rest but stores energy

D. working normally with reference input

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