Two of supply terminals to a 3 - ÃŽÂ¦ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will

Electrical Machines
Two of supply terminals to a 3 - ÃŽÂ¦ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will

rotate in direction opposite to that before maintenance.

not start at all.

get heated and damaged.

rotate in the same direction as before maintenance.

rotate in direction opposite to that before maintenance.

not start at all.

get heated and damaged.

rotate in the same direction as before maintenance.

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

any of above.

imperfect contact.

severe sparking.

rough commutator surface.

any of above.

imperfect contact.

severe sparking.

rough commutator surface.

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Electrical Machines
The basic function of a transformer is to change

the frequency

the power level

the power factor

the level of the voltage

the frequency

the power level

the power factor

the level of the voltage

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

Less than 50 %

Around 90 %

Any where between 75 % and 90 %.

Around 100 %.

Less than 50 %

Around 90 %

Any where between 75 % and 90 %.

Around 100 %.

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Electrical Machines
The synchronous motor can be started by

coupling it with a DC compound motor.

coupling it with a small AC induction motor called the pony motor.

providing damper winding in its rotor circuit.

any of the above methods.

coupling it with a DC compound motor.

coupling it with a small AC induction motor called the pony motor.

providing damper winding in its rotor circuit.

any of the above methods.

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

1.24.

0.25.

0.62.

0.72.

1.24.

0.25.

0.62.

0.72.

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Electrical Machines

Electrical Machines Two of supply terminals to a 3 - ÃŽÂ¦ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will

Electrical Machines In DC generators, the cause of rapid brush wear may be

Electrical Machines The basic function of a transformer is to change

Electrical Machines In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

Electrical Machines The synchronous motor can be started by

Electrical Machines A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

Electrical Machines
Two of supply terminals to a 3 - ÃŽÂ¦ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will

Electrical Machines
In DC generators, the cause of rapid brush wear may be

Electrical Machines
The basic function of a transformer is to change

Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

Electrical Machines
The synchronous motor can be started by

Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be