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Electrical Machines
If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will
Depends on other factor.
Remain unchanged.
Increase by 5%.
Reduce by 5%.
Depends on other factor.
Remain unchanged.
Increase by 5%.
Reduce by 5%.
Answer
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Related Question
Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?
Operating speed.
Starting torque.
Full load current.
Starting torque, operating speed, full load current.
Operating speed.
Starting torque.
Full load current.
Starting torque, operating speed, full load current.
Answer
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Electrical Machines
Oil is provided in an oil filled transformer for
cooling.
both cooling and insulation.
insulating.
lubrication.
cooling.
both cooling and insulation.
insulating.
lubrication.
Answer
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Electrical Machines
A 4 pole DC generator runs at 750 rpm and generate an emf of 240 V. The armature is wave wound and has 792 conductors. If the total flux from each pole is 0.0145 Wb. What is the leakage co-efficient?
1.8.
1.2.
1.5.
1.4.
1.8.
1.2.
1.5.
1.4.
Answer
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Electrical Machines
Compensating windings are used in DC generators
None of these
to neutralize the cross magnetizing effect of the armature reaction.
to provide path for the circulation of cooling air.
mainly to reduce the eddy currents by providing local short circuit.
None of these
to neutralize the cross magnetizing effect of the armature reaction.
to provide path for the circulation of cooling air.
mainly to reduce the eddy currents by providing local short circuit.
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 %.
increase by 5 %.
remain unchanged.
depend on other factors.
reduce by 5 %.
increase by 5 %.
remain unchanged.
Answer
Download EE MCQ app
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