electrical engineering MCQs – Page 56

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 Review each marked answer and report any item that may be outdated or unclear.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

1101. Burning out of winding is due to___________?
0

A. none of the above

B. short circuited capacitor

C. open circuiting of capacitor

D. capacitor value hiving changed

1102. Insertion of resistance in the stator of an induction motor___________?
0

A. none of the above

B. decreases the starting torque

C. increases the starting torque

D. increases the load torque

1103. What will happen if the relative speed between the rotating flux of stator and rotor of the induction motor is zero ?
0

A. The rotor will run at very high speed

B. The torque produced will be very large

C. The rotor will not run

D. The slip of the motor will be 5%

1104. Slip of an induction motor is negative when_____________?
0

A. magnetic field and rotor rotate in opposite direction

B. rotor speed is more than the synchronous speed of the field and are in the same direction

C. rotor speed is less than the synchronous speed of the field and are in the same direction

D. none of the above

1105. In case of a shaded pole motor the direction of rotation of the motor is__________?
0

A. from main pole to shaded pole

B. either of the above depending on voltage

C. either of the above depending on power factor

D. from shaded pole to main pole

1106. The speed of a squirrel-cage induction motor can be controlled by all of the following except_____________?
0

A. changing supply frequency

B. reducing supply voltage

C. changing winding resistance

D. changing number of poles

1107. In a three-phase induction motor__________?
0

A. power factor at starting is low as compared to that while running

B. power factor at starting in the same as that while running

C. power factor at starting is high as compared to that while running

1108. Which of the following motors is used for unity power factor ?
0

A. Hysteresis motor

B. Schrage motor

C. Reluctance motor

D. Universal motor

1109. Which of the following motors can be used for unity power factor ?
0

A. Shaded pole motor

B. Schrage motor

C. Capacitor run motor

D. Hysteresis motor

1110. In a two value capacitor motor, the capacitor used for running purposes is_______________?
0

A. air capacitor

B. paper spaced oil filled type

C. ceramic type

D. a.c. electrolytic type

1111. To reverse the direction of rotation of acapacitor start motor while it is running we should___________?
0

A. reverse the direction of connection of the auxiliary winding and after motor comes to rest then connect auxiliary winding to the supply

B. disconnect motor from supply and immediately reconnect it to supply with reversed connections of the main winding

C. disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding

D. reverse the direction of connections of the auxiliary winding and immediately connect it to supply

1112. The crawling in an induction motor is caused by___________?
0

A. high loads

B. low voltage supply

C. improper design of machine

D. harmonics developed in the motor

1113. The number of slip rings on a squirrel cage induction motor is usually____________?
0

A. two

B. four

C. none

D. three

1114. The injected e.m.f. in the rotor of induction motor must have__________?
0

A. zero frequency

B. the same phase as the rotor e.m.f.

C. high value for the satisfactory speed control

D. the same frequency as the slip frequency

1115. Stepless speed control of induction motor is possible by which of the following methods ?
0

A. e.m.f. injection in rotor eueuit

B. None of the above

C. Cascade operation

D. Changing the number of poles

1116. Which of the following resistances can be measured by conducting insulation resistance test on a synchronous motor ?
0

A. Stator winding to earthed frame

B. Rotor winding to earthed shaft

C. Phase to phase winding resistance

D. All of the above

1117. DOL starting of induction motors is usually restricted to_____________?
0

A. high horsepower motors

B. variable speed motors

C. high speed motors

D. low horsepower motors

1118. The motor used for the compressors is____________?
0

A. shaded pole motor

B. d.c. series motor

C. capacitor-start capacitor-run motor

D. reluctance motor

1119. Which of the following motor will give relatively high starting torque ___________?
0

A. Split phase motor

B. Capacitor start motor

C. Capacitor run motor

D. Shaded pole motor

1120. In squirrel cage induction motors, the rotor slots are usually given slight skew in order to__________?
0

A. reduce eddy currents

B. reduce accumulation of dirt and dust

C. reduce windage losses

D. reduce magnetic hum

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