electrical engineering MCQs – Page 168

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 Review each marked answer and report any item that may be outdated or unclear.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
3341. For proper operation of the transistor, its collector should have___________________?
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A. None of the above

B. Very small size

C. Proper forward bias

D. Proper reverse bias
3342. Which of the following happens in Kando system ?
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A. Three phase A.C. is converted into D.C.

B. None of the above

C. Single phase A.C. is converted into D.C.

D. Single phase supply is converted into three phase system
3343. _______________has the least value of starting torque to full load torque ratio?
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A. D.C. shunt motor

B. Slip ring induction motor

C. Squirrel cage induction motor

D. D.C. series motor

3344. When a pentavalent impurity is added to a pure semiconductor, it becomes________________?
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A. An insulator

B. n-type semiconductor

C. p-type semiconductor

D. An intrinsic semiconductor

3345. The air resistance to the movement of the train is proportional to_____________?
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A. (speed)

B. speed

C. (speed)

D. 1/speed

3346. The value of stability factor for a base resistor bias is________________?
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A. 1-

B. (+1)RC

C. (+1)

D. RB (+1)

3347. In a semiconductor, current conduction is due to________________?
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A. Only free electrons

B. Holes and free electrons

C. None of the above

D. Only holes

3348. Which of the following drives is suitable for mines where explosive gas exists ?
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A. Diesel engine

B. Battery locomotive

C. Steam engine

D. Any of the above

3349. The disadvantage of base resistor method of transistor biasing is that it_________________?
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A. None of the above

B. Provides high stability

C. Is complicated

D. Is sensitive to changes in
3350. A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is____________________?
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A. all of the above

B. high starting torque

C. slop speed operation

D. low windage losses

3351. The biasing circuit has a stability factor of 50. If due to temperature change, ICBO changes by 1 A, then IC will change by___________________?
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A. 20 A

B. 25 A

C. 100 A

D. 50 A
3352. When the load is above _______________ a synchronous motor is found to be more economical?
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A. 2 kW

B. 100 kW

C. 50 kW

D. 20 kW

3353. An AND gate will function as OR if________________?
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A. either of the inputs is 1

B. all the inputs are 0

C. all the inputs and outputs are complemented

D. all the inputs to the gates are 1

3354. A NAND gate is called a universal logic element because______________?
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A. it is used by everybody

B. all the minization techniques are applicable for optimum NAND gate realization

C. many digital computers use NAND gates

D. any logic function can be realized by NAND gates alone
3355. ___________________has least range of speed control?
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A. Slip ring induction motor

B. Synchronous motor

C. Schrage motor

D. D.C. shunt motor

3356. Which feature, while selecting a.motor for centrifugal pump, will be of least significance ?
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A. Speed control

B. Starting characteristics

C. Horse power

D. Operating speed

3357. The braking retardation is usually in the range__________________?
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A. 0.30 to 0.6 km phps

B. 3 to 5 km phps

C. 0.6 to 2.4 km phps

D. 0.15 to 0.30 km phps

E. 10 to 15 km phps

3358. At room temperature, an intrinsic silicon crystal acts approximately as_______________?
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A. An insulator

B. A conductor

C. A battery

D. A piece of copper wire

3359. The load cycle for a motor driving a power press will be________________?
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A. continuous

B. continuous but periodical

C. intermittent and variable load

D. variable load

3360. The characteristics of drive for crane hoisting and lowering are which of the following ?
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A. Fast speed control

B. Smooth movement

C. All of the above

D. Precise control