electrical engineering MCQs – Page 130

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 Review each marked answer and report any item that may be outdated or unclear.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
2581. is the property of absorbing moisture from atmosphere_____________?
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A. Solubility

B. Porosity

C. Hygroscopicity

D. Viscosity

2582. In an AM wave useful power is carrier by ______________?
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A. Carrier

B. Sidebands

C. Both sidebands and carrier

D. None of the above

2583. Platinum is used in_____________?
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A. grids of special purpose vacuum tubes

B. heating element in high temperature furnace

C. all of the above

D. electrical contacts

E. thermocouple

2584. An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is___________?
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A. 0.75

B. 0.5

C. 0.25

D. 1

2585. Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as_____________?
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A. large size machines

B. small size machines

C. any of the above

D. medium size machines
2586. Non-linear resistors______________?
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A. produce harmonic distortion

B. result in non-uniform heating

C. none of the above

D. follows Ohms law at low temperatures only

2587. When SCR is OFF, the current in the circuit is ________________?
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A. Exactly zero

B. Large leakage current

C. None of the above

D. Small leakage current
2588. When SCR starts conducting, then _____________ loses all control?
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A. Cathode

B. Anode

C. None of the above

D. Gate
2589. Carbon bearings are used under which of the following conditions ?
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A. Where corrosive chemical action exists

B. All of the above

C. Where lubrication is difficult or im-possible

D. Where high temperature exists

2590. Effect of moisture on the insulating materials is to________________?
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A. decrease insulation resistance

B. decrease dielectric constant

C. increase dielectric loss

D. decrease dielectric strength

E. all of the above
2591. At parallel resonance, the phase angle between the applied voltage and circuit current is _____________?
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A. 90o

B. None of the above

C. 0o

D. 180o

2592. The voltage gain of a tuned amplifier is____________at resonant frequency
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A. Half-way between maximum and minimum

B. Minimum

C. Zero

D. Maximum
2593. Which of the following is an advantage of stranded conductor over equivalent single conductor ?
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A. All of the above

B. Less liability to break

C. Less liability to kink

D. Greater flexibility

2594. The effective channel length of a MOSFET in a saturation decreases with increase in___________?
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A. Drain voltage

B. Gate voltage

C. Source voltage

D. Body voltage

2595. The major advantage of FM over AM is__________________?
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A. Smaller bandwidth

B. Small frequency deviation

C. Reception is less noisy

D. Higher carrier frequency

2596. At series resonance, the phase angle between applied voltage and circuit is______________?
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A. 0o

B. 90o

C. None of the above

D. 180o

2597. The early effect in a bipolar junction transistor is caused by_______________?
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A. fast turn-off

B. large emitter-base forward bias

C. fast turn-on

D. large collector-base reverse bias
2598. Total number of crystal systems is____________?
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A. 2

B. 12

C. 7

D. 4

2599. In superhetrodyne receiver, the input at mixer stage is________________?
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A. RF and local oscillator signal

B. IF and RF

C. IF and AF

D. RF and AF

2600. Addition of 0.3 to 4.5% silicon to iron ________ the electrical resistivity of iron?
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A. increases

B. decreases

C. does not change