The direction of rotation of a 3 - ÃŽÂ¦ induction motor is clockwise when it is supplied with 3 - ÃŽÂ¦ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

Electrical Machines
The direction of rotation of a 3 - ÃŽÂ¦ induction motor is clockwise when it is supplied with 3 - ÃŽÂ¦ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

C - A - B.

A - C - B.

B - C - A or C - A - B.

B - C - A.

C - A - B.

A - C - B.

B - C - A or C - A - B.

B - C - A.

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

Cumulative compound motor.

Series motor.

Shunt motor.

Differential compound motor.

Cumulative compound motor.

Series motor.

Shunt motor.

Differential compound motor.

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Electrical Machines
It is advisable to start a DC series motor with some load to

Limit the speed.

Avoid sparking.

Limit the current.

Limit the flux.

Limit the speed.

Avoid sparking.

Limit the current.

Limit the flux.

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Electrical Machines
Field weakening method is also called as-----------?

constant power control

constant torque control

constant current control

constant voltage control

constant power control

constant torque control

constant current control

constant voltage control

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Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

lap-wound machine will have more rated voltage and less current

wave-wound machine will have more rated voltage and less current

wave-wound machine will have more rated current and more voltage

lap-wound machine will have more rated voltage and more current

lap-wound machine will have more rated voltage and less current

wave-wound machine will have more rated voltage and less current

wave-wound machine will have more rated current and more voltage

lap-wound machine will have more rated voltage and more current

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Electrical Machines
No load saturation characteristics are plotted between

short circuit current and armature current

no load voltage and field current

short circuit current and field current

no load voltage and armature current

short circuit current and armature current

no load voltage and field current

short circuit current and field current

no load voltage and armature current

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Electrical Machines

Electrical Machines The direction of rotation of a 3 - ÃŽÂ¦ induction motor is clockwise when it is supplied with 3 - ÃŽÂ¦ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

Electrical Machines Ratio of starting torque to full load torque is minimum in

Electrical Machines It is advisable to start a DC series motor with some load to

Electrical Machines Field weakening method is also called as-----------?

Electrical Machines If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

Electrical Machines No load saturation characteristics are plotted between

Electrical Machines
The direction of rotation of a 3 - ÃŽÂ¦ induction motor is clockwise when it is supplied with 3 - ÃŽÂ¦ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

Electrical Machines
Ratio of starting torque to full load torque is minimum in

Electrical Machines
It is advisable to start a DC series motor with some load to

Electrical Machines
Field weakening method is also called as-----------?

Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

Electrical Machines
No load saturation characteristics are plotted between