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Answer :

The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is 0.5.

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Answer : In case of D.C. shunt motors the speed is dependent on back e.m.f. only because flux is practically constant in D:C. shunt motors.

Answer : In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be more than full-load current.

Answer : The armature may burn if the back e.m.f. of a D.C. motor vanishes suddenly.

Description : The mechanical power developed by the armature of a d.c. motor is equal to?

Answer : The mechanical power developed by the armature of a d.c. motor is equal to armature current multiplied by back e.m.f.

Answer : If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will increase.