electrical engineering MCQs – Page 354

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 Review each marked answer and report any item that may be outdated or unclear.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 generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

7061. Cylindrical windings using circular conductors, employed in transformers, are_____________?
0

A. double layered

B. single layered

C. none of the above

D. multi-layered

7062. Which of the following brushes can be used for high values of current density ?
0

A. Electro-graphitic brushes

B. Natural graphite brushes

C. Hard carbon brushes

D. Metal graphite brushes

7063. The resistivity of water should not be less than_____________?
0

A. 2000 Q m

B. 10 Q m

C. 1000 Q m

D. 100 Q m

7064. Which of the following is the major consideration to evolve a good design?
0

A. Cost

B. Durability

C. Compliance with performance criteria as laid down in specifications

D. All of the above

7065. In transformers using hot rolled steel, the cross-section of the yoke is made about __________ greater than that of the core?
0

A. 5 percent

B. 30 percent

C. 15 percent

D. 10 percent

E. none of the above

7066. Power transformers have rating_______________?
0

A. none of the above

B. equal to 100 kVA

C. equal to 50 kVA

D. above 200 kVA

7067. In induction motors, the length of air gap in kept as small as mechanically possible is order to have____________?
0

A. any of the above

B. high power factor

C. low power factor

D. high over load capacity

7068. ____________are used for construction of core of electromagnets?
0

A. None of the above

B. Soft magnetic materials

C. Either A. or B.

D. Hard magnetic materials

7069. The density of hydrogen is __________ times the density of air?
0

A. 2.5

B. 0.07

C. 3.5

D. 1.5

7070. Which of the following methods may be adopted to reduce the effects of armature reaction ?
0

A. Increasing reluctance of pole tips

B. Increase in length of air gap at pole tips

C. All of the above

D. Interpoles

E. Compensating windings

7071. Power transformers should be designed to have maximum efficiency________________?
0

A. any of the above

B. at or near full load

C. at one-half load

D. at one-fourth load

7072. The cylindrical windings using circular conductors are used for current rating of____________?
0

A. upto 20 A

B. upto 80 A

C. upto 40 A

D. upto 60 A

7073. The forced oil and air circulation method is usual one for transformers of capacities____________?
0

A. upto 5 MVA

B. upto 10 MVA

C. 30 MVA upwards

D. upto 20 MVA

7074. The change in flux linkages can be caused in which of the following ways ?
0

A. The flux is constant with respect to time and is stationary and the coil moves through it

B. The coil is stationary with respect to flux and the flux varies in magnitude with respect to time

C. Both the changes mentioned above occur together, i.e., the coil moves through a time varying field

D. All of the above

7075. Hydrogen has a heat transfer co-efficient __________ times that of air?
0

A. 3.5

B. 4.5

C. 2.5

D. 1.5

7076. ____________ is the common method of applying brushes to the commntator?
0

A. Reaction

B. Trailing

C. Radial

D. All of the above

7077. In direct cooled system using hydrogen both stator and rotor conductors are made____________?
0

A. solid

B. hollow

C. perforated

D. any ofthe above

7078. Multi-layer helical windings are commonly used in the transformers as high voltage windings_______________?
0

A. upto 80 kV

B. upto 20 kV

C. upto 50 kV

D. for 110 kV and above

7079. The mcrease in heat dissipation by air blasts is due to increase in______________?
0

A. any ofthe above

B. convection

C. conduction

D. radiation

7080. The heated parts of an electrical machine dissipate heat into their surroundings by which of the following modes of heat dissipation ?
0

A. Conduction

B. All of the above

C. Radiation

D. Convection

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