electrical engineering MCQs – Page 170

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 Review each marked answer and report any item that may be outdated or unclear.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
3381. The leakage current in a pn junction is of the order of________________?
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A. Aa

B. kA

C. mA

D. A
3382. _________________method of starting a three phase induction motor needs six terminals ?
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A. Auto-transformer

B. Resistance starting

C. None of the above

D. Star-delta
3383. Battery operated scooter for braking uses________________?
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A. mechanical braking

B. regenerative braking

C. rheostatic braking

D. plugging

3384. Flame proof motors are used in_________________?
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A. moist atmospheres

B. explosive atmospheres

C. steel mills

D. paper mills

3385. When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when_______________?
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A. wheel base of axles is more

B. degree of curvature is more

C. both A. and B.

D. none of the above

3386. In ______________ the speed can be varied by changing the position of brushes?
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A. induction motor

B. slip ring motor

C. repulsion motor

D. schrage motor
3387. In jaw crushers a motor has to often start against ____________________ load?
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A. normal

B. medium

C. heavy

D. low

3388. A semiconductor is formed by ______________bonds?
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A. Electrovalent

B. None of the above

C. Co-ordinate

D. Covalent
3389. The steam engine provided on steam locomotives is____________?
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A. double acting condensing type

B. single acting condensing type

C. single acting non-condensing type

D. double acting non-condensing type

3390. The starting torque in case of centrifugal pumps is generally_________________?
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A. less than running torque

B. double the running torque

C. slightly more than running torque

D. same as running torque

3391. For which of the following applications D.C. motors are still preferred ?
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A. Reversibility

B. High efficiency operation

C. High starting torque

D. Variable speed drive
3392. Locomotives with monometer bogies have_________________?
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A. low co-efficient of adhesion

B. suitability for passanger as well as freight service

C. lot of skidding

D. uneven distribution of tractive effect

3393. An OR gate has 6 inputs. The number of input words in its truth table are________________?
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A. 6

B. 128

C. 64

D. 32

3394. Which of the following motors always starts on load ?
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A. Fan motor

B. Conveyor motor

C. All of the above

D. Floor mill motor

3395. The number 1000 would appear just immediately after__________________?
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A. 7777 (octal)

B. FFFF (hex)

C. All of the above

D. 1111 (binary)

3396. The speed of a superfast train is______________?
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A. 60 kmph

B. more than 100 kmph

C. 100 kmph

D. 75 kmph

3397. In case of OR gate, no matter what the number of inputs, a____________________?
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A. 1 at any input causes the output to be at logic 1

B. 0 at any input causes the output to be at logic 1

C. 0 any input causes the output to be at logic 0

D. 1 at any input causes the output to be at logic 0

3398. The fan put of a 7400 NAND gate is_______________?
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A. 8TTL

B. 5TTL

C. 2TTL

D. 10TTL
3399. Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is__________________?
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A. CMOS

B. TTLAS

C. ECL

D. TTLLS

3400. Due to which of the following co-efficient of adhesion improves ?
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A. All of the above

B. Dust on the rails

C. Rust on the rails

D. Sand on the rails