electrical engineering MCQs – Page 351

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 Review each marked answer and report any item that may be outdated or unclear.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
7001. impose limitation on design____________?
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A. Power factor

B. Efficiency

C. All above

D. Saturation

E. Temperature rise

7002. The action of electromagnetic machines can be related to which of the following basic principles __________?
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A. Induction

B. Interaction

C. Alignment

D. All of the above
7003. Direct water cooling of rotor winding presents_____________?
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A. none of the above

B. lesser mechanical difficulties

C. no mechanical difficulties

D. greater mechanical difficulties
7004. When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of_____________?
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A. full pitch

B. none of the above

C. either of the above

D. short pitch

7005. The length cf air gap to be provided in __________ is primarily determined by power factor consideration?
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A. d.c. shunt motor

B. induction motor

C. d.c. series motor .

D. synchronous motor

7006. Hot rolled sheets have ___________ value of permeability?
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A. low

B. zero

C. none of the above

D. high

7007. The insulation between windings and grounded core and the insulation between the windings of the same phase is called__________________?
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A. minor insulation

B. either of the above

C. none of the above

D. major insulation
7008. In _________ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft?
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A. medium

B. any of the above.

C. small

D. large
7009. With direct water cooling it is possible to have ratings of about_____________?
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A. 300 MW

B. 400 MW

C. 600 MW

D. 200 MW

7010. The input impedance of a JFET is _____________that of an ordinary transistor?
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A. less than

B. more than

C. none of the above

D. equal to

7011. __________is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ?
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A. Grey cast-iron

B. Stainless steel

C. High carbon steel

D. Cast steel
7012. A practical formula for determining the thickness of insulation between low voltage and high voltage windings is__________________?
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A. 1 + 0.2 kVmm

B. 5 + 0.9 kV mm

C. 2 + 0.5 kVmm

D. 4 + 0.7 kV mm

7013. Which of the following in an application of D.C. motors?
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A. Battery driven vehicles

B. All of the above

C. Traction

D. Automatic control

E. Drives for process industry

7014. D.C. windings are____________?
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A. none of the above

B. never 2-layer type

C. always 2-layer type

D. sometimes 2-layer type

7015. By which of the following methods the temperature rise of windings and other parts may be determined ?
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A. Embedded temperature detector method

B. Resistance method

C. Thermometer method

D. Any of the above
7016. Commercial available medium size machines have a speed range of __________ ?
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A. 600 to 1000 r.p.m

B. 2000 to 2500 r.p.m

C. 1000 to 1500 r.p.m

D. 200 to 400 r.p.m

7017. The surge phenomenon is particularly important in case of_______________?
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A. high voltage transformers

B. medium voltage transformers

C. any of the above

D. low voltage transformers

7018. The voltage control in electric supply networks in required on account of which of the following reasons ?
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A. All of the above

B. Control of active and reactive power

C. Adjustment of voltage at consumers premises within statutory limits

D. Adjustment of short period daily and seasonal voltage variations in accordance with variations of load

7019. The laminations of the armature of a D.C. machine are usually ___________ thick?
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A. 0.2 to 0.3 mm

B. 0.3 to 0.4 mm

C. 0.1 to 0.2 mm

D. 0.4 to 0.5 mm
7020. Tractive magnets are operated from____________?
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A. either a.c. or d.c. supply

B. d.c. supply

C. none of the above</strong>

D. a.c. supply