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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be
250 V.
very small, say about 2 or 3 V.
about 100 V.
zero.
250 V.
very small, say about 2 or 3 V.
about 100 V.
zero.
Answer
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Related Question
Electrical Machines
The speed of a 3-phase induction motor operating in its stable region
remains constant.
increases with increase in the load torque.
decreases with decrease in the load torque.
decreases with increase in the load torque.
remains constant.
increases with increase in the load torque.
decreases with decrease in the load torque.
decreases with increase in the load torque.
Answer
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Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?
5
12
24
10
5
12
24
10
Answer
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Electrical Machines
In a DC machine the armature mmf is
rotating with respect to field poles as well as armature.
rotating with respect to field poles.
stationary with respect to field poles.
stationary with respect to armature.
rotating with respect to field poles as well as armature.
rotating with respect to field poles.
stationary with respect to field poles.
stationary with respect to armature.
Answer
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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at
750rpm
zero speed
1500 rpm
1000 rpm
750rpm
zero speed
1500 rpm
1000 rpm
Answer
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Electrical Machines
DC machine is a
both are correct.
none of above are correct.
convection machine.
conduction machine.
both are correct.
none of above are correct.
convection machine.
conduction machine.
Answer
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