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Electrical Machines
Consider the following statements: To control the speed of a dc shunt motor above the base speed over a reasonably wide range, the motor must 1. have compensating winding 2. have interpole winding 3. be started using a 3-point starter 4. be started using a 4-point starter Of these statements
1, 2 and 3 are correct
1, 2 and 4 are correct
1 and 3 are correct
2 and 4 are correct
1, 2 and 3 are correct
1, 2 and 4 are correct
1 and 3 are correct
2 and 4 are correct
Answer
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Related Question
Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects
neither the voltage nor the torque
both the torque and voltage
voltage but not the torque
torque but not the voltage
neither the voltage nor the torque
both the torque and voltage
voltage but not the torque
torque but not the voltage
Answer
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Electrical Machines
In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?
Delta side leads by 30°.
Delta side lags by -30°.
Star side leads by 30°.
Star side lags by -30°.
Delta side leads by 30°.
Delta side lags by -30°.
Star side leads by 30°.
Star side lags by -30°.
Answer
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Electrical Machines
Skewing of cage rotors offers the following advantages
less noise.
locking tendency is reduced.
all of below.
uniform torque.
less noise.
locking tendency is reduced.
all of below.
uniform torque.
Answer
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Electrical Machines
In applied voltage is reduced in a dc shunt motor
Full load torque.
None of these.
Full load speed.
Full load current.
Full load torque.
None of these.
Full load speed.
Full load current.
Answer
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Electrical Machines
A DC generator beyond critical resistance will generate
maximum power.
maximum current.
no voltage.
maximum voltage.
maximum power.
maximum current.
no voltage.
maximum voltage.
Answer
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