DC Machines MCQ

1. The armature of DC machine is laminated in order to reduce

1. hysteresis losses
2. copper losses
3. frictional losses
4. eddy current losses

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2. The yoke of a DC machine is generally made of

1. silicon steel
2. cast steel
3. soft iron
4. cast steel

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3. If field current is decreased in shunt dc motor, the speed of the motor

1. increases
2. decreases
3. remain same
4. none of the above

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4. In Ward-Leonard system, the lower limit of the speed imposed by

1. armature resistance
2. field resistance
3. residual magnetism of the generator
4. none of the above

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5. Ward-Leonard control is basically a _________________________ control method.

1. armature resistance control
2. field control
3. armature voltage control
4. field diverter control

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6. In a DC Machine, the current flow in a armature circuit is

1. pulsating DC
2. pure DC
3. AC
4. none of the above

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7. As the armature reaction effect increases, the main flux of DC machine is

1. increases
2. decreases
3. remain same
4. none of the above

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8. In DC machines, slot wedges are generally made of

1. cotton
2. fibre
3. impregnated paper
4. silicon steel

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9. Eddy current loss will depends on

1. flux density
2. frequency
3. thickness
4. all of the above

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10. Hysteresis loss will depends on

1. f
2. f²
3. f³
4. f^1.6

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