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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor
None of these.
Decrease.
Increase.
Remains same.
None of these.
Decrease.
Increase.
Remains same.
Answer
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Related Question
Electrical Machines
In a DC Shunt Motor if the load current increases keeping the terminal voltage constant, then flux will
decrease.
increase.
any of the above.
remain constant.
decrease.
increase.
any of the above.
remain constant.
Answer
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Electrical Machines
The 3 - Φ induction motors are, by a very considerable margin, the most widely used AC motors as
they have very good speed regulation.
they are capable of operation under range of leading and lagging pf.
they have maximum efficiency and maximum starting torque.
these are cheaper in cost, simple and rugged in construction.
they have very good speed regulation.
they are capable of operation under range of leading and lagging pf.
they have maximum efficiency and maximum starting torque.
these are cheaper in cost, simple and rugged in construction.
Answer
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Electrical Machines
Hunting in a synchronous motor takes place
when power factor is unity.
motor is under loaded.
when load varies.
when supply voltage fluctuates.
when power factor is unity.
motor is under loaded.
when load varies.
when supply voltage fluctuates.
Answer
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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?
1000.
500.
2000.
0.
1000.
500.
2000.
0.
Answer
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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for
electromechanical energy conversion
generation of voltage
commutation
development of torque
electromechanical energy conversion
generation of voltage
commutation
development of torque
Answer
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