☰ Electrical Energy Utilisation and Electric Traction (Electrical Engineering) - MCQs

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Q13.

For automatic drives the preference is for

  • A. synchronous motors
  • B. Ward Leonard controlled dc shunt motors
  • C. plain squirrel cage induction motors
  • D. all of the above
    ✍ Discuss    
Q14.

The semiconductor device used for speed control of single phase induction motors in everyday domestic use is

  • A. SCR
  • B. power transistor
  • C. Triac
  • D. power MOS
    ✍ Discuss    
Q15.

For the speed control of AC drive, the preferred method using thyristors is

  • A. phase control
  • B. chopper control
  • C. integral cycle control
  • D. all are equally good
    ✍ Discuss    
Q16.

The least expensive drive is

  • A. belt drive
  • B. rope drive
  • C. chain drive
  • D. gear drive
    ✍ Discuss    
Q17.

Sleeve bearings

  • A. are normally of bronze
  • B. have self lubricating properties
  • C. are used where noise is to be avoided
  • D. all of the above
    ✍ Discuss    
Q18.

Hot bearings of a DC motor may be caused by

  • A. poor ventilation
  • B. incorrect voltage
  • C. loose coupling
  • D. lack of dirty lubricant
    ✍ Discuss    
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