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
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

18.18% increase

36.36% decrease

36.36% increase

18.18% increase

36.36% decrease

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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 system lost residual magnetism

field winding was wrongly connected

field resistance was higher than critical resistance

there was a break in the armature circuit

field system lost residual magnetism

field winding was wrongly connected

field resistance was higher than critical resistance

there was a break in the armature circuit

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

DC Series Motor

Separately Excited DC Motor

DC Shunt Motor

Compound Wound DC Motor

DC Series Motor

Separately Excited DC Motor

DC Shunt Motor

Compound Wound DC Motor

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

lagging power factor

unity power factor

All of these

leading power factor

lagging power factor

unity power factor

All of these

leading power factor

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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

2 ohm.

100 ohm

10 ohm

0.2 ohm

2 ohm.

100 ohm

10 ohm

0.2 ohm

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Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

unity

lagging

zero

leading

unity

lagging

zero

leading

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Electrical Machines

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

Electrical Machines Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

Electrical Machines In which of the following, voltage regulation may be zero or negative

Electrical Machines In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

Electrical Machines In a transformer zero voltage regulation is achieved at a load power factor which is

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

Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

Electrical Machines
In which of the following, voltage regulation may be zero or negative

Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is