The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is

Electrical Machines
The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is

1, 2, 5

2, 3, 6

2, 4, 5, 6

3, 4, 5

1, 2, 5

2, 3, 6

2, 4, 5, 6

3, 4, 5

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

R1 /K

K²R1

K×R1

R1 /K²

R1 /K

K²R1

K×R1

R1 /K²

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Electrical Machines
When a synchronous motor is running at synchronous speed, the damper winding produces

no torque.

eddy current torque.

damping torqe.

both 1 and 2.

no torque.

eddy current torque.

damping torqe.

both 1 and 2.

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Electrical Machines
In a step down transformer which one of the following statements is true?

Secondary current is less than primary current.

Secondary power is less than primary power.

Number of secondary turns is less than primary turns.

Number of secondary turns is more than that of primary.

Secondary current is less than primary current.

Secondary power is less than primary power.

Number of secondary turns is less than primary turns.

Number of secondary turns is more than that of primary.

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Electrical Machines
The field system of an alternator is usually excited

230 V AC.

3 - ÃŽÂ¦, 50 Hz and 400 V.

250 / 250 V DC.

110 / 220 V AC.

230 V AC.

3 - ÃŽÂ¦, 50 Hz and 400 V.

250 / 250 V DC.

110 / 220 V AC.

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Electrical Machines
The three point starter is used for

Series motor.

Shunt motor as well as compound motors.

Shunt motor.

Shunt, compound and series motor.

Series motor.

Shunt motor as well as compound motors.

Shunt motor.

Shunt, compound and series motor.

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Electrical Machines

Electrical Machines R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

Electrical Machines When a synchronous motor is running at synchronous speed, the damper winding produces

Electrical Machines In a step down transformer which one of the following statements is true?

Electrical Machines The field system of an alternator is usually excited

Electrical Machines The three point starter is used for

Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

Electrical Machines
When a synchronous motor is running at synchronous speed, the damper winding produces

Electrical Machines
In a step down transformer which one of the following statements is true?

Electrical Machines
The field system of an alternator is usually excited

Electrical Machines
The three point starter is used for