electrical engineering MCQs – Page 133

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 Review each marked answer and report any item that may be outdated or unclear.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
2641. For frequencies above the resonant frequency, a parallel LC circuit behaves as a ____________ load?
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A. Inductive

B. None of the above

C. Resistive

D. Capacitive
2642. Low resistivity materials are used in__________?
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A. house wiring

B. transmission and distribution lines

C. transformer, motor and generator windings

D. all above applications
2643. Copper, even though costly, finds use in the windings of electrical machines because_____________?
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A. copper can be easily soldered and welded

B. copper points offer low contact resistance

C. all of the above

D. copper windings are less bulky and the machines become compact

2644. In parallel resonance, there is _______________?
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A. Both voltage and current amplification

B. Voltage amplifications

C. Current amplification

D. None of the above

2645. In induction motors, the length of air gap in kept as small as mechanically possible is order to have____________?
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A. high power factor

B. high over load capacity

C. low power factor

D. any of the above

2646. At 100% modulation, the power in each sideband is _____________ of that of carrier?
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A. 25%

B. 50%

C. 40%

D. 60%

2647. In a parallel LC circuit, if the input signal frequency is increased above resonant frequency then _______________?
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A. XL increases and XC decreases

B. XL decreases and XC increases

C. Both XL and XC increase

D. Both XL and XC decrease

2648. A good electric contact material should have all of the following properties except_____________?
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A. high melting point

B. high resistance to corrosion

C. high resistivity

D. good thermal conductivity

2649. The current gain of a bipolar transistor drops at high frequencies because of____________?
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A. High current effects in the base

B. The early effect

C. Transistor capacitances

D. Parasitic inductive elements

2650. Which of the following high resistance materials has the highest operating temperature ?
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A. Eureka

B. Nichrome

C. Manganin

D. Kanthal
2651. If L/C ratio of a parallel LC circuit is increased, the Q of the circuit______________?
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A. None of the above

B. Is increased

C. Is decreased

D. Remains the same

2652. For frequencies above the resonant frequency , a series LC circuit behaves as a ____________load?
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A. Capacitive

B. None of the above

C. Resistive

D. Inductive
2653. In the normal operation of an SCR, anode is __________ w.r.t. cathode?
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A. Positive

B. Negative

C. At zero potential

D. None of the above

2654. At series resonance, the net reactive component of circuit current is _______________?
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A. Zero

B. Capacitive

C. None of the above

D. Inductive

2655. The superhetrodyne principle provides selectivity at ______________stage?
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A. IF

B. RF

C. Before RF

D. audio

2656. The number of atoms per unit cell in B.C.C. structure is_____________?
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A. 4

B. 8

C. 2

D. 1

2657. In amplitude modulation, bandwidth is ____________ the audio signal frequency?
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A. Four times

B. Thrice

C. Twice

D. None of the above

2658. The letters AVC stand for ________________?
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A. Abrupt voltage control

B. Automatic voltage control

C. Audio voltage control

D. Automatic volume control
2659. A tuned amplifier is generally operated in ____________operation?
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A. Class A

B. Class C

C. Class B

D. None of the above

2660. Superhertodyne principle refers to_________________?
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A. Using a large number of amplifier stages

B. Obtaining lower fixed intermediate frequency

C. None of the above

D. Using a push-pull circuit