05th
May
DC Motor MCQ

DC Motor MCQ

  • Admin
  • 05th May, 2021
  • 659 Followers

Take DC Motor MCQ Test & Online Quiz to test your Knowledge

Below is the DC Motor MCQ test that checks your basic knowledge of DC Motor. This DC Motor MCQ Test contains 20 Multiple Choice Questions. You have to select the right answer to the question. Finally, you can also take the Online Quiz from the Take DC Motor Quiz Button.

DC motor MCQ Test

1) If the back emf of a DC motor vanishes suddenly, What will happen ?

  • A. The motor will stop
  • B.The motor will run noisy
  • C.The armature may burn
  • D.The motor will continue to run

2) ________________part will surely tell that given motor is DC motor and not an AC type.

  • A. Winding
  • B.Commutator
  • C.Shaft
  • D.Stator

3) Sparking is discouraged ______________ in a DC motor.

  • A. discouraged
  • B.incouraged
  • C.increase
  • D.discrease

4) Torque developed by a DC motor depends upon -

  • A. magnetic field
  • B.current flow through the conductors
  • C.active length of the conductor
  • D.Current, active length, no. of conductors, magnetic field al

5) Which of the following is used for A three-point starter.

  • A. Shunt, compound and series motors
  • B.Shunt motor
  • C.Shunt as well as compound motors
  • D.Not for DC motors
Download Free : DC Motor MCQ PDF

6) If DC motor is used without starter, What will happen ?

  • A. Heavy sparking at brushes
  • B.Will not start at all
  • C.Depends on load
  • D.It’ll start smoothly

7) ________________D.C. motor is preferred for elevators ?

  • A. Series motor
  • B.Cumulative compound motor
  • C.Shunt motor
  • D.Differential compound motor

8) In case-the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be

  • A. 100%
  • B.around 90%
  • C.less than 50%
  • D.anywhere between 75% and 90%

9) In a D.C. generator, the iron losses mainly take place in -

  • A. commutator
  • B.yoke
  • C.armature conductors
  • D.armature rotor

10) in which types of D.C. motor, dynamic braking is generally used ?

  • A. Series motors
  • B.Shunt motors
  • C.Compound motors
  • D.All of the above

11) The armature torque of a dc motor is a function of its -

  • A. Field flux alone
  • B.peed alone
  • C.Speed alone
  • D.Both field flux and armature current

12) The brush voltage drops in dc in / of the order of ____________________ .

  • A. 10 V
  • B.2 V
  • C.20 V
  • D.40 V

13) D.C. series motors are used in ____________________ .

  • A. where constant operating speed is needed
  • B.where load is constant
  • C.where load changes frequently
  • D.none of the above situations

14) Hopkinson’s test on D.C. machines is conducted at -

  • A. no-load
  • B.part load
  • C.full-load
  • D.overload

15) D.C. shunt motors are commonly used in ________________ .

  • A. Electric traction
  • B.Cranes
  • C.Elevators
  • D.Lathe machines

16) Hopkinson’s test on D.C. machines is conducted at

  • A. part load
  • B.no-load
  • C.full-load
  • D.overload

17) The special device which converts AC into DC and vice versa is known as ____________ .

  • A. Armature
  • B.Split rings
  • C.Slip rings
  • D.Field magnets

18) Which of the following is the shape of brushes ?

  • A. Triangular
  • B.Cylindrical
  • C.Rectangular
  • D.Square

19) __________________is also called motor rule’?

  • A. Fleming’s left hand rule
  • B.Fleming’s right hand rule
  • C.both 1 & 2
  • D.All of the above

20) The mechanical losses are about _____ % of full load losses.

  • A. 30 to 40
  • B.20 to 30
  • C.10 to 20
  • D.0 to 10

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