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.

26.21 kW.

23.06 kW.

24.11 kW.

25 kW.

26.21 kW.

23.06 kW.

24.11 kW.

ANSWER DOWNLOAD EXAMIANS APP

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

thinner.

sipper.

rotor can not have any laminations.

thicker.

thinner.

sipper.

rotor can not have any laminations.

thicker.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

90 V.

60 V.

40 V.

30 V.

90 V.

60 V.

40 V.

30 V.

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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

36.36% increase

36.36% decrease

36.36% increase

18.18% increase

36.36% increase

36.36% decrease

36.36% increase

18.18% increase

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Electrical Machines
Cogging in induction motor occurs when

number of stator teeth - number of rotor teeth = odd number.

number of stator teeth - number of rotor teeth = even number.

number of stator teeth - number of rotor teeth = negative number.

number of stator teeth - number of rotor teeth = 0.

number of stator teeth - number of rotor teeth = odd number.

number of stator teeth - number of rotor teeth = even number.

number of stator teeth - number of rotor teeth = negative number.

number of stator teeth - number of rotor teeth = 0.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

either of these.

decrease.

increase.

None of these

either of these.

decrease.

increase.

None of these

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

Electrical Machines A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

Electrical Machines A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

Electrical Machines Cogging in induction motor occurs when

Electrical Machines In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

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 IM the rotor lamination can be ________________ than stator laminations.

Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

Electrical Machines
Cogging in induction motor occurs when

Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs