Electrical Engineering MCQs on DC Motor MCQs Part 1
In case the back EMF and the speed of a DC motor are doubled, torque developed by the motor will
In case the back EMF and the speed of a DC motor are doubled, torque developed by the motor will
- Be doubled
- Increase four folds
- Reduce to one-fourth value
- Remain unchanged
Correct answer: 4. Remain unchanged
The DC motor that will be preferred for machine tools
The DC motor that will be preferred for machine tools
- Cumulative compound motor
- Differential compound motor
- Series motor
- Shunt motor
Correct answer: 4. Shunt motor
The function of pole shoes in a DC machine is not
The function of pole shoes in a DC machine is not
- To reduce eddy current loss
- To reduce the reluctance of the magnetic path
- To spread out flux for better uniformity
- To support the field coils
Correct answer: 1. To reduce eddy current loss
Differentially compound DC motors are appropriate for applications that involve
Differentially compound DC motors are appropriate for applications that involve
- Frequent on-off cycles
- High starting torque
- Low starting torque
- Variable speed
Correct answer: 3. Low starting torque
The rule or law that can he used to determine the direction of rotation of DC motor
The rule or law that can he used to determine the direction of rotation of DC motor
- Coulomb’s law
- Faraday
- Fleming
- Lenz’s law
Correct answer: 3. Fleming