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Q.

Increasing the speed of a DC motor causes armature current to:

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a

Increase

b

Decrease

c

Increase and decrease continuously

d

None of the above

answer is B.

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Detailed Solution

Concept: An electrical device that transforms electrical energy into mechanical energy is a DC motor. Direct current, the electrical energy used as an input source in a DC motor, is converted into mechanical rotation.
Changing the current in the field or the current in the armature will alter the speed of a DC motor. The counter emf drops when the field current, flux, and counter emf all decrease. This permits more armature current. The motor accelerates as a result.
Hence , the correct option is 2.

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