The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

increase

become zero

remain the same

decrease

increase

become zero

remain the same

decrease

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

2000W

1920W

1820W

1450W

2000W

1920W

1820W

1450W

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

reduce by 5 %.

depend on other factors.

remain unchanged.

increase by 5 %.

reduce by 5 %.

depend on other factors.

remain unchanged.

increase by 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

K²R1

R1 /K²

R1 /K

K×R1

K²R1

R1 /K²

R1 /K

K×R1

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

460 V

230 V

115 V

200 V

460 V

230 V

115 V

200 V

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Electrical Machines
A 10 kW, 230 V, dc shunt machine has four terminals brought out through four leads. For this machine

armature winding has thin leads whereas field winding has thick leads

both the windings have thin leads

both the windings have thick leads

armature winding has thick leads whereas field winding has thin leads

armature winding has thin leads whereas field winding has thick leads

both the windings have thin leads

both the windings have thick leads

armature winding has thick leads whereas field winding has thin leads

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Electrical Machines

Electrical Machines A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

Electrical Machines If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

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 If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

Electrical Machines A 10 kW, 230 V, dc shunt machine has four terminals brought out through four leads. For this machine

Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

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
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

Electrical Machines
A 10 kW, 230 V, dc shunt machine has four terminals brought out through four leads. For this machine