electrical engineering MCQs – Page 129

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 Review each marked answer and report any item that may be outdated or unclear.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
2561. Over modulation results in ______________?
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A. Distortion

B. None of the above

C. Weakening of the signal

D. Excessive carrier power

2562. The efficiency of a machine should be as ____________ as possible to reduce the operating cost?
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A. low

B. either of the above

C. none of the above

D. high
2563. A resonant circuit contains ____________elements?
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A. R and C only

B. Only R

C. L and C

D. R and L only

2564. The design of mechanical parts is particularly important in case of __________ speed machines?
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A. any of the above

B. high

C. low

D. medium

2565. A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor ?
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A. 3

B. 5

C. None of the above

D. 6
2566. For a particular material the Hall coefficient was found to be zero. The material is______________?
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A. none of the above

B. metal

C. insulator

D. intrinsic semiconductor

2567. Which of the following factors affect resistivity of metals ?
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A. Cold work

B. All of the above

C. Alloying

D. Age hardening

E. Temperature

2568. In a superhetrodyne receiver, the difference frequency is chosen as the IF rather than the sum frequency because _________________?
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A. The difference frequency is closer to oscillator frequency

B. Lower frequencies are easier to amplify

C. None of the above

D. Only the difference frequency can be modulated

2569. At parallel resonance, the line current is_______________?
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A. Minimum

B. Quite large

C. Maximum

D. None of the above

2570. Solder is an alloy of______________?
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A. silver, copper and lead

B. copper and aluminium

C. tin and lead

D. nickel, copper and zinc

2571. The most commonly used amplifier in sample & hold circuits is______________?
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A. A unity gain inverting amplifier

B. A unity gain non-inverting amplifier

C. An inverting amplifiers with a gain of 100

D. An inverting amplifier with a gain of 10

2572. Thermocouples are mainly used for the measurement of_____________?
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A. eddy currents

B. temperature

C. resistance

D. coupling co-efficient

2573. In a superconductor the value of critical density depends upon______________?
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A. magnetic field strength

B. temperature

C. either (A) or (B)

D. both (A) and (B)
2574. Due to which of the following reasons copper and aluminium are not used for heating elements ?
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A. Both have great tendency for oxidation

B. Both have low melting point

C. Very large length of wires will be required

D. All of the above
2575. If level of modulation is increased ______________ power is increased?
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A. None of the above

B. Carrier as well as sideband

C. Carrier

D. Sideband
2576. In a common emitter, unbypassed resister provides___________?
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A. current series feedback

B. voltage shunt feedback

C. negative voltage feedback

D. positive current feedback

2577. In a transmitter ____________oscillator is used?
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A. RC phase-shift

B. Hartley

C. Wien-bridge

D. Crystal
2578. Most of the common metals have _________ structure?
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A. cubic

B. hexagonal

C. orthorhombic

D. linear

2579. An SCR is turned off by _________________?
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A. Reverse biasing the gate

B. Reducing anode voltage to zero

C. None of the above

D. Reducing gate voltage to zero

2580. Spark plug makes use of which of the following materials for insulation ?
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A. Slate

B. Porcelain

C. Asbestos

D. Glass