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:
- High current and high voltage rating
- High current and low voltage rating
- Low current and high voltage rating
- 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:
- Iron
- Silicon steel
- Lead
- Cobalt
Correct answer: 2. Silicon steel
The armature is laminated in order to:
- Increase eddy current losses
- Reduce eddy current losses
- Reduce hysteresis losses
- Increases hysteresis losses
Correct answer: 2. Reduce eddy current losses
The armature MMF of dc machine has:
- Stationery triangular space distribution
- Rotating triangular space distribution
- Stationery Trapezoidal space distribution
- Rotating trapezoidal space distribution
Correct answer: 1. Stationery triangular space distribution
The flux distribution in dc machine depends on:
- Shape of pole shoes
- Size of air gap
- Both of these
- None of these
Correct answer: 3. Both of these
Equalizers are __________ located on _______ of __________ DC machine:
- Bars, stator, frog-leg dc machine
- Bars, rotor, frog-leg dc machine
- Bars, stator, lap wound dc machine
- Bars, rotor, lap wound dc machine
Correct answer: 4. Bars, rotor, lap wound dc machine
Armature windings are those:
- In which Voltage is induced
- Which produce main magnetic flux
- Both of these
- None of these
Correct answer: 1. In which Voltage is induced
The general fashion in which overheating damages motor:
- It instantly burns winding
- It produces gradual degradation
Correct answer: 2. It produces gradual degradation
More MCQ on DC Machines:
- Generally the preferred DC Motor for cranes and hoists is
- The approximate thickness of laminations of a D.C. machine is
- Usually, the field coils of D.C. generator are made from
- Copper Loss is constant for which type of DC Generator