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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°.
Star side leads by 30°.
Star side lags by -30°.
Delta side lags by -30°.
Delta side leads by 30°.
Star side leads by 30°.
Star side lags by -30°.
Delta side lags by -30°.
Answer
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Related Question
Electrical Machines
If the air gap of IM is increased, ____________ will increase.
power factor.
speed.
air gap flux.
magnetizing current.
power factor.
speed.
air gap flux.
magnetizing current.
Answer
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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be
0.62.
0.72.
1.24.
0.25.
0.62.
0.72.
1.24.
0.25.
Answer
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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
increase by 5 %.
depend on other factors.
reduce by 5 %.
remain unchanged.
increase by 5 %.
depend on other factors.
reduce by 5 %.
remain unchanged.
Answer
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Electrical Machines
Which of the following induction motor has the highest starting torque?
Squirrel cage induction motor.
Slip ring induction motor.
None of these
Same in both induction motors.
Squirrel cage induction motor.
Slip ring induction motor.
None of these
Same in both induction motors.
Answer
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Electrical Machines
In a DC generator, the ripples in the direct emf generated are reduced by employing
graphite brushes.
equalizer rings.
commutator with large number of segments.
carbon brushes.
graphite brushes.
equalizer rings.
commutator with large number of segments.
carbon brushes.
Answer
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