A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

25 kW.

23.06 kW.

26.21 kW.

24.11 kW.

25 kW.

23.06 kW.

26.21 kW.

24.11 kW.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards

direction of flux.

direction of motion of the conductor.

direction of induced emf.

opposite to the direction of motion of the conductor.

direction of flux.

direction of motion of the conductor.

direction of induced emf.

opposite to the direction of motion of the conductor.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

not start automatically.

start automatically without trouble.

develop very low starting torque.

get damaged.

not start automatically.

start automatically without trouble.

develop very low starting torque.

get damaged.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

to an AC source.

to earth.

in reverse.

to a DC source.

to an AC source.

to earth.

in reverse.

to a DC source.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
What is/are the necessary conditions for voltage build up in self excited generator?

Field winding resistance should be less than critical resistance.

All of these

Field winding should be properly connected to armature winding.

Poles should contain residual flux.

Field winding resistance should be less than critical resistance.

All of these

Field winding should be properly connected to armature winding.

Poles should contain residual flux.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
What is the necessity of copper brushes in a dc motors?

To convert alternating supply current to direct current.

None of these.

To increase the flux cutting by the rotor.

To absorb the mechanical shocks produced during running condition.

To convert alternating supply current to direct current.

None of these.

To increase the flux cutting by the rotor.

To absorb the mechanical shocks produced during running condition.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines

Electrical Machines A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

Electrical Machines When Flemings right hand rule to find the direction of induced emf, the thumb points towards

Electrical Machines If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

Electrical Machines If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

Electrical Machines What is/are the necessary conditions for voltage build up in self excited generator?

Electrical Machines What is the necessity of copper brushes in a dc motors?

Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards

Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

Electrical Machines
What is/are the necessary conditions for voltage build up in self excited generator?

Electrical Machines
What is the necessity of copper brushes in a dc motors?