☰ DC Machines (Electrical Engineering) - MCQs

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Q13.

when the torque of DC series motor is tripled, the power approximately increases by

  • A. 33%
  • B. 50%
  • C. 75%
  • D. 1 50%
    ✍ Discuss    
Q14.

a flywheel is normal fitted to

  • A. DC series motor driving a constant torque load
  • B. separately excited DC motor driving pulsed torque load
  • C. communicative li compound motor driving torque load
  • D. differentially compound motor driving pulsed torque load
    ✍ Discuss    
Q15.

in comparison to saint and compound motors, a DC series motor devolve high torque at start. it is due to its comparatively

  • A. few series turns
  • B. stronger series field
  • C. larger armature current
  • D. smaller armature resistance
    ✍ Discuss    
Q16.

for higher value of armature current the speed of a DC motor is

  • A. proportional to armature current
  • B. proportional to the square of armature current
  • C. inversely proportional to armature current
  • D. constant
    ✍ Discuss    
Q17.

the mechanical output available at the DC motor shaft is equal to

  • A. electric power input to motor
  • B. electric power input less iron and friction losses
  • C. electrical power input less copper losses
  • D. electrical power input less total losses
    ✍ Discuss    
Q18.

in a DC motor, the shaft torque is less than armature torque. this is due to

  • A. eddy current loss
  • B. hysteresis loss
  • C. stray loss
  • D. all of the above
    ✍ Discuss    
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