electrical engineering MCQs – Page 126

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 Review each marked answer and report any item that may be outdated or unclear.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
2501. The transition temperature of mercury is____________?
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A. 9.22K

B. 4.12K

C. 1.14K

D. 18.0K

2502. If a radio receiver amplifies all the signal frequencies equally well, it is said to have high ________________?
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A. Selectivity

B. Fidelity

C. Distortion

D. Sensitivity

2503. The impurity atoms is semiconductors_____________?
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A. increase the kinetic energy of valence electrons

B. reduce the energy gap

C. all of the above

D. inject more charge carriers

2504. Class AB operation is often used in power large signal amplifiers in order to_________?
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A. get maximum efficiency

B. remove even harmonics

C. overcome a crossover distortion

D. reducing collector dissipation

2505. __________ is a hard solder?
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A. Tin-silver-lead

B. None of the above

C. Tin-lead

D. Copper-zinc
2506. Due to which of the following factors the brush wear rate is altered ?
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A. Contact pressure

B. Excessive sparking

C. All of the above

D. Surface conditions of brush and commutator

E. Speed of the machine

2507. Due to which of the following fact, in India, aluminium is replacing copper ?
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A. Aluminium is available in plenty, cheaper and lighter than copper

B. Aluminium is more ductile and malleable than copper

C. Aluminium has less temperature co-efficient than copper

D. Aluminium has lower resistivity than that of copper

2508. When the modulating signal controls the frequency of the carrier, we get______________?
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A. Amplitude modulation

B. Frequency modulation

C. Phase modulation

D. May be any one of the above

2509. The diode detector in an AM radio receiver is usually found _____________?
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A. After the first RF stage

B. After several stages of amplification

C. None of the above

D. Before the first RF stage

2510. ___________ is most commonly used for making magnetic recording tape?
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A. Small particles of iron

B. Silver nitrate

C. Ferric oxide

D. Silicon-iron

2511. A tuned amplifier uses__________load?
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A. Inductive

B. LC tank

C. Capacitive

D. Resistive

2512. highest conductivity_____________?
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A. easy solderable and drawable quality

B. good mechanical strength

C. good corrosion resistance

D. all of the above

E. lowest temperature co-efficient

2513. impose limitation on design____________?
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A. Saturation

B. All above

C. Power factor

D. Temperature rise

E. Efficiency

2514. The metal having the lowest temperature coefficient of resistance is_________________?
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A. kanthal

B. aluminium

C. copper

D. gold
2515. An amplifier using an opamp with slew rate SR=1v/sec has a gain of 40db.if this amplifier has to faithfully amplify sinusoidal signals from dc to 20 KHz without introducing any slew-rate induced distortion, then the input signal level must not exceed________?
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A. 395mV

B. 795 mV

C. 39.5mV

D. 795mV

2516. A 50 kW carrier is to be amplitude modulated to a level of 85%. What is the carrier power after modulation ?
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A. 50 kW

B. 5 kW

C. 25 kW

D. 8 kW

2517. The cascade amplifier is a multistage configuration of__________?
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A. CE-CB

B. CC-CB .

C. CE-CC

D. CB-CC

2518. The Q of a tuned amplifier is generally _________________?
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A. More than 10

B. Less than 10

C. None of the above

D. Less than 5

2519. Which of the following is a semiconductor material ?
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A. Phosphorous

B. Rubber

C. Silicon

D. Aluminium

2520. A carbon resistor contains_____________?
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A. carbon crystals

B. finely divided carbon black

C. pulverized coal

D. solid carbon granules