DC Motor Electronic Engineering question & answer - Electronic Engineering


DC Motor Electronic Engineering Multiple Choice questions / objective type questions, MCQs with question and answers.


    Question 1: ln the DC Motor the iron losses occur in ?

  • the field
  • the brushes
  • the armature
  • the commutator
  • Answers: the armature

    Question 2: The main disadvantage of the Ward Leonard control method is?

  • all of the above

  • high initial cost
  • low efficiency at light loads
  • high maintenance cost
  • Answers: all of the above

    Question 3: The retardation test is applicable to shunt motors and generators and is used to find?

  • the friction losses
  • the copper losses
  • the eddy current losses
  • the stray losses
  • Answers: the stray losses

    Question 4: A series motor is best suited for driving?

  • machine tools
  • cranes and hoists
  • shear and punches
  • none of the above
  • Answers: cranes and hoists

    Question 5: When the electric train is moving down a hill the DC motor act as?

  • DC shunt motor
  • DC shunt generator
  • DC series generator
  • DC series motor
  • Answers: DC series generator

    Question 6: Which of the following motors, on removal of load, will run at the highest speed?

  • Shunt motor
  • Differential compound
  • Cumulative compound
  • Series motor
  • Answers: Series motor

    Question 7: If the speed of a DC shunt motor is increased, the back EMF of the motor will?

  • decrease
  • Increase
  • remain same
  • become zero
  • Answers: Increase

    Question 8: In a DC generator, the iron losses mainly take place in?

  • armature conductors
  • yoke
  • armature rotor
  • commutator
  • Answers: armature rotor

    Question 9: Which one of the following is not necessarily the advantage of DC motors over AC Motors?

  • Low cost
  • Wide speed range
  • High starting torque
  • Stability
  • Answers: Low cost

    Question 10: In electric motors carbon brushes are used to?

  • brush off carbon deposits on the commutator
  • prevent overheating of armature windings
  • prevent sparking during commutation
  • provide a path for flow of current
  • Answers: provide a path for flow of current

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