electrical engineering MCQs – Page 164

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 Review each marked answer and report any item that may be outdated or unclear.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
3261. Electric locomotives in India are manufactured at______________?
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A. Gorakhpur

B. Jamalpur

C. Bangalore

D. Chittranjan
3262. Which of the following is essentially needed while selecting a motor ?
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A. Starter

B. Foundation pedal

C. Pulley

D. Bearings

3263. In squirrel cage induction motors which of the following methods of starting cannot be used ?
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A. Resistance in stator circuit

B. Star-delta starting

C. Auto-transformer starting

D. Resistance in rotor circuit
3264. A trivalent impurity has______________valence electrons?
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A. 5

B. 3

C. 4

D. 6

3265. The number of passenger coaches that can be attached to a diesel engine locomotive on broad gauge is usually restricted to_____________/
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A. 14

B. 5

C. 10

D. 17

3266. Long distance railways use which of the following ?
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A. 25 kV two phase A.C.

B. 25 kV three phase A.C.

C. 25 kV single phase A.C.

D. 200 V D.C.

3267. Assuming 8 bits for data, 1 bit for parity, I start bit and 2 stop bits, the number of characters that 1200 BPS communication line can transmit is__________________?
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A. 12CPS

B. 10 CPS

C. None of the above

D. 120 CPS

3268. In case of _______________ speed control by injecting e.m.f. in the rotor circuit is possible?
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A. slip ring induction motor

B. d.c. shunt motor

C. synchronous motor

D. schrage motor

3269. A reluctance motor_________________?
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A. is compact

B. requires starting gear

C. is provided with slip rings

D. has high cost

3270. Which of the following motors is preferred for boom hoist of a travelling crane ?
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A. Single phase motor

B. Synchronous motor

C. A.C. slip ring motor

D. Ward-Leonard controlled D.C. shunt motor

3271. The inputs of a NAND gate are connected together. The resulting circuit is _______________?
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A. OR gate

B. AND gate

C. NOT gate

D. None of the above

3272. Thermal runaway occurs when_________________?
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A. Emitter is forward biased

B. Transistor is not biased

C. Collector is reverse biased

D. Junction capacitance is high

3273. The resistivity of a pure silicon is about _______________?
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A. 6000 O cm

B. 6 x 10-8 O cm

C. 3 x 105 O m

D. 100 O cm

3274. The inverter is _________________?
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A. one of the above

B. AND gate

C. OR gate

D. NOT gate
3275. In the depletion region of a pn junction, there is a shortage of_________________?
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A. None of the above

B. Acceptor ions

C. Holes and electrons

D. Donor ions

3276. NAND gates are preferred over others because these__________________?
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A. can be used to make any gate

B. consume least electronic power

C. have lower fabrication area

D. provide maximum density in a chip

3277. Overload capacity of diesel engines is usually restricted to_______________?
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A. 40 percent

B. 2 percent

C. 20 percent

D. 10 percent

3278. A pn junction acts as a__________________?
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A. Controlled switch

B. Bidirectional switch

C. None of the above

D. Unidirectional switch
3279. For three-phase induction motors which of the following is the least efficient method of speed control ?
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A. Combination of cascade and pole changing

B. Pole changing

C. Rheostat control

D. Cascade control

3280. If the maximum collector current due to signal alone is 3 mA, then zero signal collector current should be at least equal to___________________?
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A. 3 mA

B. 1 mA

C. mA

D. 6 mA