☰ DC Machines (Electrical Engineering) - MCQs

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Q7.

this is and motors are used for driving

  • A. machine tools
  • B. centrifugal pumps
  • C. line shafts
  • D. all of these
    ✍ Discuss    
Q8.

if the speed of a DC motor increases with load torque, then it is a

  • A. series motor
  • B. permanent magnet
  • C. differentially compounded motor
  • D. communicatively compounded motor
    ✍ Discuss    
Q9.

it is advisable to start a DC series motor with some load to

  • A. limit the flux
  • B. limit the current
  • C. limit the speed
  • D. avoid sparking
    ✍ Discuss    
Q10.

in case of DC series motor it is possible to have a no load speed if a resistance is connected across its

  • A. field terminals
  • B. armature terminals
  • C. field and armature together
  • D. it is always very high at no load
    ✍ Discuss    
Q11.

a DC series motor must not be started on no load because it would

  • A. not develop starting torque
  • B. fall to start without load
  • C. run at dangerously high speed
  • D. draw more current without producing sufficient torque
    ✍ Discuss    
Q12.

when electric train is moving towards a hill, the DC motor will operate as a DC

  • A. series motor
  • B. series generator
  • C. shunt motor
  • D. shunt generator
    ✍ Discuss    
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