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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region
decreases with increase in the load torque.
remains constant.
decreases with decrease in the load torque.
increases with increase in the load torque.
decreases with increase in the load torque.
remains constant.
decreases with decrease in the load torque.
increases with increase in the load torque.
Answer
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Related Question
Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm
0.23Ω.
0.5Ω.
1Ω.
0.25Ω.
0.23Ω.
0.5Ω.
1Ω.
0.25Ω.
Answer
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Electrical Machines
If we increase the rotor reactance value, the maximum torque will
not changed
increase
None of these
decrease
not changed
increase
None of these
decrease
Answer
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Electrical Machines
Commutation in a DC machine may be explained as a process
by virtue of which emf is induced in the armature conductors.
by which electric current in a coil is reversed.
in which magnetic field is set up.
how alternate flux affects the main field flux.
by virtue of which emf is induced in the armature conductors.
by which electric current in a coil is reversed.
in which magnetic field is set up.
how alternate flux affects the main field flux.
Answer
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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be
demagnetisation.
none of above.
cross-magnetisation.
cross-magnetization as well as demagnetization.
demagnetisation.
none of above.
cross-magnetisation.
cross-magnetization as well as demagnetization.
Answer
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Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.
10 volts.
40 volts.
30 volts.
20 volts.
10 volts.
40 volts.
30 volts.
20 volts.
Answer
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