electrical engineering MCQs – Page 113

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 Review each marked answer and report any item that may be outdated or unclear.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
2241. A second condition for oscillations is____________?
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A. No gain around the feedback loop

B. The attention of the feedback circuit must be one-third

C. A gain of 1 around the feedback loop

D. The feedback circuit must be capacitive

2242. A series resistance is connected in the zener circuit to_______________?
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A. protect the zener

B. none of the above

C. properly forward bias the zener

D. properly reverse bias the zener

2243. In a p-n junction diode under reverse bias , the magnitude of electric field is maximum at_____________?
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A. the p-n junction

B. the edge of the depletion region on the n-side

C. the edge of the depletion region on the p-side

D. the center of the depletion region on the n-side

2244. A differential amplifier is invariably used in the i/p stage of all op-amps. This is done basically to provide the op-amps with a very high______________?
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A. Slew rate

B. CMMR

C. Bandwidth

D. Open-loop gain

2245. Which of the following has the highest value of thermal conductivity ?
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A. Water

B. Sold ice

C. Steam

D. Melting ice

2246. If the feedback fraction of an amplifier is 0.01, then voltage gain with negative feedback is approximately________________?
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A. 500

B. 5000

C. 100

D. 1000

2247. ____________is a fixed frequency oscillator?
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A. Colpitts oscillator

B. Phase-shift oscillator

C. Crystal oscillator

D. Hartely-oscillator

2248. The maximum efficiency of a half-wave rectifier is _____________?
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A. 40.6 %

B. 81.20%

C. 25%

D. 50%

2249. For radiant heating around 2250C, the heating elements are made of____________?
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A. tungsten alloy

B. stainless steel alloy

C. carbon

D. copper alloy

2250. Ajax Wyatt furnace is started when____________?
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A. none of the above

B. it is filled below core level

C. it is filled above core level

D. it is fully empty

2251. When an additional resistor is connected across an existing parallel circuit, the total resistance____________?
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A. remains the same

B. decreases by the value of the added resistor

C. decreases

D. increases by the value of the added resistor

2252. The h parameter approach gives correct results for_______________?
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A. Large signals only

B. Small signals only

C. Both small and large signals

D. None of the above

2253. In a phase shift oscillator, we use____________RC sections?
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A. Four

B. Two

C. None of the above

D. Three
2254. When the graph between current through and voltage across a device is a straight line, the device is referred to as _______________?
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A. passive

B. active

C. linear

D. nonlinear

2255. Heat transfer by condition will not occur when____________?
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A. temperatures of the two bodies are identical

B. bodies are kept in vacuum

C. bodies are immersed in water

D. bodies are exposed to thermal radiations

2256. An oscillator differs from an amplifier because it_____________?
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A. Requires no d.c. supply

B. Always has the same input

C. Requires no input signal

D. Has more gain

2257. The most widely used rectifier is ________________?
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A. half-wave rectifier

B. bridge full-wave rectifier

C. none of the above

D. centre-tap full-wave rectifier

2258. The knee voltage of a crystal diode is approximately equal to ________________?
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A. forward voltage

B. applied voltage

C. breakdown voltage

D. barrier potential
2259. When a body reflects entire radiation incident on it, then it is known as____________?
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A. transparent body

B. black body

C. white body

D. grey body

2260. The element that has the biggest size in a transistor is____________?
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A. collector

B. base

C. emitter

D. collector-base-junction