DC motor MCQ Quiz

  1. If the back emf of a DC motor vanishes suddenly, What will happen ?
  2. ________________part will surely tell that given motor is DC motor and not an AC type.
  3. Sparking is discouraged ______________ in a DC motor.
  4. Torque developed by a DC motor depends upon -
  5. Which of the following is used for A three-point starter.
  6. If DC motor is used without starter, What will happen ?
  7. ________________D.C. motor is preferred for elevators ?
  8. In case-the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be
  9. In a D.C. generator, the iron losses mainly take place in -
  10. in which types of D.C. motor, dynamic braking is generally used ?
  11. The armature torque of a dc motor is a function of its -
  12. The brush voltage drops in dc in / of the order of ____________________ .
  13. D.C. series motors are used in ____________________ .
  14. Hopkinson’s test on D.C. machines is conducted at -

Take DC motor Quiz To test your Knowledge

Below are few DC motor MCQ test that checks your basic knowledge of DC motor. This DC motor Test contains around 20 questions of multiple choice with 4 options. You have to select the right answer to a question. You can see the correct answer by clicking view answer link.

DC motor MCQ

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

  • The motor will stop
  • The motor will run noisy
  • The armature may burn
  • The motor will continue to run
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2. ________________part will surely tell that given motor is DC motor and not an AC type.

  • Winding
  • Commutator
  • Shaft
  • Stator
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3. Sparking is discouraged ______________ in a DC motor.

  • discouraged
  • incouraged
  • increase
  • discrease
View Answer

4. Torque developed by a DC motor depends upon -

  • magnetic field
  • current flow through the conductors
  • active length of the conductor
  • Current, active length, no. of conductors, magnetic field al
View Answer

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

  • Shunt, compound and series motors
  • Shunt motor
  • Shunt as well as compound motors
  • Not for DC motors
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6. If DC motor is used without starter, What will happen ?

  • Heavy sparking at brushes
  • Will not start at all
  • Depends on load
  • It’ll start smoothly
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7. ________________D.C. motor is preferred for elevators ?

  • Series motor
  • Cumulative compound motor
  • Shunt motor
  • Differential compound motor
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8. In case-the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be

  • 100%
  • around 90%
  • anywhere between 75% and 90%
  • less than 50%
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9. In a D.C. generator, the iron losses mainly take place in -

  • commutator
  • yoke
  • armature conductors
  • armature rotor
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10. in which types of D.C. motor, dynamic braking is generally used ?

  • Series motors
  • Shunt motors
  • Compound motors
  • All of the above
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11. The armature torque of a dc motor is a function of its -

  • Field flux alone
  • peed alone
  • Speed alone
  • Both field flux and armature current
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12. The brush voltage drops in dc in / of the order of ____________________ .

  • 2 V
  • 10 V
  • 20 V
  • 40 V
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13. D.C. series motors are used in ____________________ .

  • where constant operating speed is needed
  • where load is constant
  • none of the above situations
  • where load changes frequently
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14. Hopkinson’s test on D.C. machines is conducted at -

  • no-load
  • part load
  • full-load
  • overload
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15. D.C. shunt motors are commonly used in ________________ .

  • Electric traction
  • Cranes
  • Elevators
  • Lathe machines
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16. Hopkinson’s test on D.C. machines is conducted at

  • part load
  • no-load
  • full-load
  • overload
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17. The special device which converts AC into DC and vice versa is known as ____________ .

  • Armature
  • Split rings
  • Slip rings
  • Field magnets
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18. Which of the following is the shape of brushes ?

  • Triangular
  • Cylindrical
  • Rectangular
  • Square
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19. __________________is also called ‘motor rule’?

  • Fleming’s left hand rule
  • Fleming’s right hand rule
  • both 1 & 2
  • All of the above
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20. The mechanical losses are about _____ % of full load losses.

  • 30 to 40
  • 20 to 30
  • 10 to 20
  • 0 to 10
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