electrical engineering MCQs – Page 165

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 Review each marked answer and report any item that may be outdated or unclear.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
3281. If the value of collector current IC increases, then the value of VCE ______________?
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A. None of the above

B. Increases

C. Decreases

D. Remains the same

3282. For germanium transistor amplifier, VCE should_______________for faithful amplification?
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A. Not fall below 0.7 V

B. Be 0.2 V

C. Be zero

D. None of the above

3283. Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction ?
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A. Series parallel operation of motors

B. All of the above

C. Tap changing control of transformer

D. Reduced current method

3284. The base resistor method is generally used in ________________?
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A. Amplifier circuits

B. None of the above

C. Switching circuits

D. Rectifier circuits

3285. Belted slip ring induction motor is almost invariably used for_________________?
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A. water pumps

B. none of the above

C. centrifugal blowers

D. jaw crushers
3286. A forward biased pn junction diode has a resistance of the order of_____________?
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A. O

B. MO

C. kO

D. None of the above

3287. Which of the following motors is usually preferred for kiln drives ?
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A. Three phase shunt wound com-mutator motor

B. Cascade controlled A.C. motor

C. Slip ring induction motor

D. Any of the above
3288. In a base resistor method, if the value of changes by 50, then collector current will change by a factor ___________________?
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A. 100

B. 200

C. 50

D. 25

3289. Light duty cranes are used in which of the following ?
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A. Automobile workshops

B. Power houses

C. Pumping stations

D. All of the above
3290. For given maximum axle load tractive efforts of AC. locomotive will be_____________?
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A. more than that of D.C. locomotive

B. equal to that of D.C. locomotive

C. none of the above

D. less than that of D.C. locomotive

3291. For good stabilsation in voltage divider bias, the current I1 flowing through R1 and R2 should be equal to or greater than_____________?
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A. 3 IB

B. 10 IB

C. 4 IB

D. 2 IB

3292. In case of steam engines the steam pressure is_______________?
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A. 10 to 15 kgf/cm2

B. 5 to 8 kgf/cm2

C. 1 to 4 kgf/cm2

D. 25 to 35 kgf/cm2

3293. Which of the following motors is used for elevators ?
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A. Induction motor

B. Synchronous motor

C. Any of the above

D. Capacitor start single phase motor

3294. The disadvantage of voltage divider bias is that it has _________________?
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A. None of the above

B. Low base current

C. Many resistors

D. High stability factor

3295. The only function of NOT gate is to__________________?
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A. None of the above

B. Stop signal

C. Invert input signal

D. Act as a universal gate

3296. In case of a steam engine an average coal consumption per km is nearly________________?
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A. 28 to 30 kg

B. 100 to 120 kg

C. 60 to 80 kg

D. 150 to 175 kg

3297. The output stage of a multistage amplifier usually employs _________________?
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A. None of the above

B. Preamplifier

C. Class A power amplifier

D. Push-pull amplifier
3298. The impurity level in an extrinsic semiconductor is about_______________of pure semiconductor ?
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A. 10 atoms for 108 atoms

B. 1 atom for 108 atoms

C. 1 atom for 104 atoms

D. 1 atom for 100 atoms

3299. Specific energy consumption becomes________________?
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A. more on steeper gradient

B. less if distance between stops is more

C. more with high train resistance

D. all of the above
3300. For derries and winches which of the following drives can be used ?
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A. Pole changing squirrel cage motors

B. Any of the above

C. D.C. motors with Ward-leonard con-trol

D. A.C. slip ring motors with variable resistance