Quiz  /  D.C. Motors Class 11 MCQ Questions With Answers

  • 1. 
    The part of an electric motor that doesn't spin is called the...

  • armature
  • commutator
  • stator
  • bearings

  • 2. 
    Which DC motor is preferred for constant speed?

  • Series motor
  • Compound motor
  • Shunt motor
  • Differential motor

  • 3. 
    A simple DC electric motor is fitted with a coil that rotates in a magnetic field. A commutator connects the power supply to the coil.What is the purpose of the commutator?

  • It converts AC into DC in the coil.
  • It prevents the current from becoming too great, because the coil has a low resistance
  • It reverses the direction of the current in the coil after every 180° rotation of the coil
  • It switches the current off momentarily after every 90° rotation of the coil

  • 4. 
    _____________________ a device used to convert electric energy into mechanical energy.

  • Motor
  • Direct Current
  • Alternating Current
  • Compass

  • 5. 
    Look at the picture what is letter A?

  • Armature
  • Commutator
  • Permanent Magnet
  • DC Source
  • AC Source

  • 6. 
    The reason for providing field winding of DC motor with thick wire is

  • To provide large flux
  • To carry large load current
  • To reduce eddy current
  • To increase the flux

  • 7. 
    In the image shown, the dark grey shapes are called:

  • Brushes
  • Armatures
  • Commutators
  • Windings

  • 8. 
    Types of DC motor.

  • Compound field winding Motor
  • Series field winding Motor
  • Shunt field winding Motor
  • All of the above

  • 9. 
    ______________ magnets are created by passing a current through a wire.

  • compass magnets
  • electromagnets
  • DC Motor Magnets

  • 10. 
    DC motors get powered from

  • alternators
  • batteries

  • 11. 
    Look at the picture what is letter C?

  • Armature
  • Commutator
  • Permanent Magnet
  • DC Source
  • Brush

  • 12. 
    THE WORKING PRINCIPLE OF DC MOTOR IS---------

  • MUTUAL INDUCTION
  • FLEMING'S RIGHT HAND
  • LORENTZ LAW

  • 13. 
    Look at the picture what is letter B?

  • Armature
  • Commutator
  • Permanent Magnet
  • DC Source
  • AC Source

  • 14. 
    Magnetic field lines flow

  • north to south
  • north to north
  • south to south
  • south to north

  • 15. 
    An Electrical machine which converts mechanical energy to electrical energy is called as

  • motor
  • generator
  • capacitor
  • transformer
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