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Electrical Machines
Which type of motors are preferred in lifts?
DC series motors.
DC shunt motors.
DC compound motors.
None of these
DC series motors.
DC shunt motors.
DC compound motors.
None of these
Answer
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Related Question
Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by
E1 / E2 = f1kw1 / f2kw2.
E1 / E2 = 1.
E1 / E2 = N1kw1 / N2kw2.
E1 / E2 = N1 / N2.
E1 / E2 = f1kw1 / f2kw2.
E1 / E2 = 1.
E1 / E2 = N1kw1 / N2kw2.
E1 / E2 = N1 / N2.
Answer
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Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of
synchronous motor.
transformer with secondary short circuited.
capacitor start induction motor.
repulsion start induction motor.
synchronous motor.
transformer with secondary short circuited.
capacitor start induction motor.
repulsion start induction motor.
Answer
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Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?
Series.
Separately excited.
Shunt.
Compound.
Series.
Separately excited.
Shunt.
Compound.
Answer
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Electrical Machines
An unexcited single phase synchronous motor is
repulsion motor.
reluctance motor.
AC series motor.
universal motor.
repulsion motor.
reluctance motor.
AC series motor.
universal motor.
Answer
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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is
500 rpm.
3600 rpm.
3000 rpm.
600 rpm.
500 rpm.
3600 rpm.
3000 rpm.
600 rpm.
Answer
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