DC Machines MCQ

A DC Machine is the one that converts mechanical energy to dc electrical energy or dc electrical energy to mechanical energy.

DC Machines MCQ

Wave winding in dc machines is employed for:

  1. High current and high voltage rating
  2. High current and low voltage rating
  3. Low current and high voltage rating
  4. Low current and low voltage rating

Correct answer: 3. Low current and high voltage rating


Usually, the armature of the DC machine is made of:

  1. Iron
  2. Silicon steel
  3. Lead
  4. Cobalt

Correct answer: 2. Silicon steel


The armature is laminated in order to:

  1. Increase eddy current losses
  2. Reduce eddy current losses
  3. Reduce hysteresis losses
  4. Increases hysteresis losses

Correct answer: 2. Reduce eddy current losses


The armature MMF of dc machine has:

  1. Stationery triangular space distribution
  2. Rotating triangular space distribution
  3. Stationery Trapezoidal space distribution
  4. Rotating trapezoidal space distribution

Correct answer: 1. Stationery triangular space distribution


The flux distribution in dc machine depends on:

  1. Shape of pole shoes
  2. Size of air gap
  3. Both of these
  4. None of these

Correct answer: 3. Both of these


Equalizers are __________ located on _______ of __________ DC machine:

  1. Bars, stator, frog-leg dc machine
  2. Bars, rotor, frog-leg dc machine
  3. Bars, stator, lap wound dc machine
  4. Bars, rotor, lap wound dc machine

Correct answer: 4. Bars, rotor, lap wound dc machine


Armature windings are those:

  1. In which Voltage is induced
  2. Which produce main magnetic flux
  3. Both of these
  4. None of these

Correct answer: 1. In which Voltage is induced


The general fashion in which overheating damages motor:

  1. It instantly burns winding
  2. It produces gradual degradation

Correct answer: 2. It produces gradual degradation

More MCQ on DC Machines:

  1. Generally the preferred DC Motor for cranes and hoists is
  2. The approximate thickness of laminations of a D.C. machine is
  3. Usually, the field coils of D.C. generator are made from
  4. Copper Loss is constant for which type of DC Generator

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