The speed of a D.C. shunt motor can be increased by

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

A

Increase

B

Decrease

C

Remain same

D

Become zero

If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens

A

This will make armature to take heavy current, possibly burning it

B

This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses

C

Nothing will happen to motor

D

Motor will come to stop

If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens

A

Nothing will happen to the motor

B

This will make armature to take heavy current, possibly burning it

C

This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses

D

Motor will run at very slow speed

As the load is increased the speed of D.C. shunt motor will

A

Reduce slightly

B

Increase slightly

C

Increase proportionately

D

Remains unchanged

The speed of a D.C. shunt motor more than its full-load speed can be obtained by

A

Decreasing the field current

B

Increasing the field current

C

Decreasing the armature current

D

Increasing the armature current

The speed of a DC shunt motor is required to be more than full load speed . This is possible by-

A

reducing the field current

B

decreasing the armature current

C

increasing the armature current

D

None of the above

The speed of a D.C. shunt motor is required to be more than full load speed. This is possible by

A

Reducing the field current

B

Decreasing the armature current

C

Increasing the armature current

D

Increasing the excitation current

If the field of a D.C. shunt motor gets opened while motor is running

A

The speed of motor will be reduced %

B

The armature current will reduce

C

The motor will attain dangerously high speed 1

D

The motor will continue to run at constant speed

a motor -cycle covers 40 Km with a speed of 20 km /hr. Find the speed of the motor -cycle for the next 40 km journey so that the average speed of the whole journey will be 30 km / hr.

A

70.0km /hr

B

52.5km /hr

C

60.0km/hr

D

60. 5 km / hr

A motor cycle covers 40 km with a speed of 20 km/hr. Find the speed of the motor cycle for the next 40 km journy so that the average speed of the whole journey will be 30 km/hr?

A

70

B

52.5

C

60

D

60.5

The speed of a D.C. shunt motor can be increased by

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