electrical engineering MCQs – Page 136

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 Review each marked answer and report any item that may be outdated or unclear.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 generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
2701. When a transistor is used as an amplifier, it is operated in the _____________ region?
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A. Saturation

B. Off

C. None of the above

D. Active
2702. The resistance of an ideal voltmeter is ______________?
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A. Zero

B. Low

C. Infinite

D. High

2703. _____________ has the lowest noise-level?
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A. triode

B. JFET

C. tetrode

D. ordinary trnsistor

2704. If load resistance in the above question (Q.49) is removed, the output voltage will_____________?
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A. stay the same

B. increase

C. decrease

D. be zero

2705. When a rectangular voltage waveform is applied to a capacitor, then the current waveform is ______________?
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A. Sinusoidal

B. Sawtooth

C. Square

D. Rectangular
2706. In a certain CS JFET amplifier, RD= 1kO , RS= 560 O , VDD=10V and gm= 4500 S. If the source resistor is completely bypassed, the voltage gain is ________________?
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A. 4.5

B. 45

C. 2.52

D. 450

2707. Which of the following devices has the highest input impedance ?
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A. ordinary transistor

B. MOSFET

C. JFET

D. Crystal diode

2708. Disc windings are primarily used in_____________-?
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A. medium capacity transformers

B. high capacity transformers

C. short capacity transformers

D. any of the above

2709. The input resistance of a VTVM is about ______________?
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A. 1000 O

B. 10 MO

C. 10 kO

D. 20 kO

2710. Which of the following is the basic consideration in the design of insulation ?
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A. Mechanical considerations

B. All of the above

C. Electrical considerations

D. Thermal considerations

2711. Which of the following materials is used in the manufacture of resistance grids to be used in the starters of large motors ?
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A. Aluminium

B. Copper

C. Cast-iron

D. Steel

2712. A relay is superior to a mechanical switch because it _______________?
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A. Combines control with power amplification

B. Does not require moving contacts

C. None of the above

D. Is relatively inexpensive

2713. The channel of a JFET is between the ________________?
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A. drain and source

B. gate and drain

C. gate and source

D. input and output

2714. A series ohmmeter circuit uses a 3 V battery and a 1 mA meter movement. What is the half-scale resistance for this movement ?
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A. 3 kO

B. kO

C. 6 kO

D. kO

2715. Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ?
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A. Increased I R losses

B. All of the above

C. Change in motor parameters

D. Poor commutation

E. Increased core losses

2716. A certain regulator has a no-load voltage of 6 V and a full-load output of 5.82 V. What is the load regulation ?
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A. None of the above

B. 09%

C. 72%

D. 87%

2717. Which of the following is likely to have the largest resistance ?
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A. Voltmeter of range 10 V

B. Ammeter of range 1 A

C. Moving coil galvanometer

D. A copper wire of length 1 m and diameter 3 mm

2718. If d.c. supply of 10 V is fed to a differentiating circuit, then output will be_______________?
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A. None of the above

B. 20 V

C. 10 V

D. 0 V
2719. In a JFET, when drain voltage is equal to pinch-off voltage, the depletion layers ______________?
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A. almost touch each other

B. have moderate gap

C. none of the above

D. have large gap

2720. D.C. servomotors are used in______________?
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A. purely D.C. control systems

B. purely AC. control systems

C. both D.C. and AC. control systems

D. none of the above