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Electrical Machines
In a star - delta starting of an IM
applied voltage per stator phase is 57.7 % of a line volt
line voltage is 57.7 % of stator voltage.
reduced voltage is applied to the stator.
resistance is inserted in the rotor.
applied voltage per stator phase is 57.7 % of a line volt
line voltage is 57.7 % of stator voltage.
reduced voltage is applied to the stator.
resistance is inserted in the rotor.
Answer
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Related Question
Electrical Machines
Transformer cooling and insulating oil must be of
low BDV.
low resistivity.
low viscosity.
high viscosity.
low BDV.
low resistivity.
low viscosity.
high viscosity.
Answer
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Electrical Machines
Which of the following motor is used in grinders?
Synchronous motor.
Capacitor start IM.
Capacitor start capacitor run IM.
Split phase IM.
Synchronous motor.
Capacitor start IM.
Capacitor start capacitor run IM.
Split phase IM.
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
depend on other factors.
reduce by 5 %.
remain unchanged.
increase by 5 %.
depend on other factors.
reduce by 5 %.
remain unchanged.
increase by 5 %.
Answer
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Electrical Machines
The polarity of a DC generator can be reversed by
increasing field current.
any of above.
reversing field electric current as well as direction of rotation.
reversing the field current.
increasing field current.
any of above.
reversing field electric current as well as direction of rotation.
reversing the field current.
Answer
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Electrical Machines
The basic function of a transformer is to change
the frequency
the power factor
the power level
the level of the voltage
the frequency
the power factor
the power level
the level of the voltage
Answer
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