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

23.06 kW.

25 kW.

26.21 kW.

24.11 kW.

23.06 kW.

25 kW.

26.21 kW.

24.11 kW.

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Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

increase.

remains constant.

decrease.

None of these

increase.

remains constant.

decrease.

None of these

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Electrical Machines
A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because

field resistance was higher than critical resistance

field winding was wrongly connected

field system lost residual magnetism

there was a break in the armature circuit

field resistance was higher than critical resistance

field winding was wrongly connected

field system lost residual magnetism

there was a break in the armature circuit

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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

depend on other factors.

remain unchanged.

reduce by 5 %.

increase by 5 %.

depend on other factors.

remain unchanged.

reduce by 5 %.

increase by 5 %.

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Electrical Machines
The emf induced in the dc generator armature winding is

DC

AC

None of these

AC and DC

DC

AC

None of these

AC and DC

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

thinner.

sipper.

thicker.

rotor can not have any laminations.

thinner.

sipper.

thicker.

rotor can not have any laminations.

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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 In a transformer operating at constant voltage if the input frequency increases, the core loss

Electrical Machines A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because

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 The emf induced in the dc generator armature winding is

Electrical Machines In IM the rotor lamination can be ________________ than stator laminations.

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
In a transformer operating at constant voltage if the input frequency increases, the core loss

Electrical Machines
A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because

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
The emf induced in the dc generator armature winding is

Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.