☰ DC Machines (Electrical Engineering) - MCQs

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Q19.

the horsepower obtained from the motor shaft is called the

  • A. IPH
  • B. BHP
  • C. useful output
  • D. none of these
    ✍ Discuss    
Q20.

the DC motor, which can provide zero speed regulation at full load without any controller is

  • A. series
  • B. shunt
  • C. cumulative compound
  • D. differential compound
    ✍ Discuss    
Q21.

a DC motor devolves the maximum mechanical power when the armature current is such that

  • A. the back EMF is equal to three fourth of the applied EMF
  • B. the back EMF is equal to one half of the applied EMF
  • C. the back EMF is equal to one fourth of the Palladium
  • D. the back EMF is equal to two-third of the applied EMF
    ✍ Discuss    
Q22.

deficiency of a DC motor wonderwall paying maximum power will be about

  • A. 100%
  • B. 50%
  • C. less than 50%
  • D. more than 50%
    ✍ Discuss    
Q23.

in case of DC motor, maximum mechanical power is evolved when back EMF equals

  • A. the applied voltage
  • B. half the applied voltage
  • C. one third of the applied voltage
  • D. double the applied voltage
    ✍ Discuss    
Q24.

when the mechanical power developed by a DC motor maximum?

  • A. back EMF is equal to applied voltage
  • B. back EMF is equal to zero
  • C. back EMF is equal to half the applied voltage
  • D. none of the above
    ✍ Discuss    
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