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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are
both A and B.
rating of generators should be same.
terminal voltage should be same.
polarities should be same.
both A and B.
rating of generators should be same.
terminal voltage should be same.
polarities should be same.
Answer
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Related Question
Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by
changing the load.
varying the speed.
changing the field excitation.
varying the applied voltage.
changing the load.
varying the speed.
changing the field excitation.
varying the applied voltage.
Answer
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Electrical Machines
In case of a DC Shunt motor if the load is decreased to some extent, what will happen to its speed?
The speed will remains almost constant.
The speed will increase gradually.
The speed will increase abruptly.
The speed will increase in proportion to reduction in load.
The speed will remains almost constant.
The speed will increase gradually.
The speed will increase abruptly.
The speed will increase in proportion to reduction in load.
Answer
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Electrical Machines
In a synchronous motor, damper windings are provided on
None of these
pole faces.
rotor shaft.
stator frame.
None of these
pole faces.
rotor shaft.
stator frame.
Answer
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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at
1500 rpm
1000 rpm
750rpm
zero speed
1500 rpm
1000 rpm
750rpm
zero speed
Answer
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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?
2-S
1/S
S
1-S
2-S
1/S
S
1-S
Answer
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