DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

None of these.

Both of above.

Heavy sparking at brushes.

Heavy sparking at the first stud of starting resistance steps.

None of these.

Both of above.

Heavy sparking at brushes.

Heavy sparking at the first stud of starting resistance steps.

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Electrical Machines
Rotating part of DC motor is known as

Armature.

Carbone brush.

Pole.

Starter.

Armature.

Carbone brush.

Pole.

Starter.

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Electrical Machines
Which of the following is the largest conversion device?

Synchronous machine

All of these

Induction machine

DC machine

Synchronous machine

All of these

Induction machine

DC machine

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

5 %.

1.5 %.

30 %.

2.67 %.

5 %.

1.5 %.

30 %.

2.67 %.

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Electrical Machines
The damper windings also called the squirrel cage windings or damper grids

are provided in a synchronous motor to make it self starting.

both (A) and (B).

consists of short-circuited copper bars embedded in the field pole faces.

are provided on the stator for improving power factor.

are provided in a synchronous motor to make it self starting.

both (A) and (B).

consists of short-circuited copper bars embedded in the field pole faces.

are provided on the stator for improving power factor.

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Electrical Machines
During no load test, an induction motor draws power

for copper loss and windage friction loss.

for core loss and copper loss.

only for the small copper loss.

for core loss and windage and friction loss.

for copper loss and windage friction loss.

for core loss and copper loss.

only for the small copper loss.

for core loss and windage and friction loss.

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Electrical Machines

Electrical Machines DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

Electrical Machines Rotating part of DC motor is known as

Electrical Machines Which of the following is the largest conversion device?

Electrical Machines A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

Electrical Machines The damper windings also called the squirrel cage windings or damper grids

Electrical Machines During no load test, an induction motor draws power

Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

Electrical Machines
Rotating part of DC motor is known as

Electrical Machines
Which of the following is the largest conversion device?

Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

Electrical Machines
The damper windings also called the squirrel cage windings or damper grids

Electrical Machines
During no load test, an induction motor draws power