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Electrical Machines
Motors for fans and pumps are selected in the rpm range
720 to 920.
375 to 500.
1440 to 2880.
500 to 720.
720 to 920.
375 to 500.
1440 to 2880.
500 to 720.
Answer
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Related Question
Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of
None of these
permanent magnets.
armature reaction.
residual magnetism.
None of these
permanent magnets.
armature reaction.
residual magnetism.
Answer
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Electrical Machines
As compared to an induction motor, the air gap in a DC motor is
same.
between 50% and 90%.
more.
less than 50%.
same.
between 50% and 90%.
more.
less than 50%.
Answer
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Electrical Machines
Slip rings of an induction motors are made of
stainless steel.
phosphor bronze.
carbon.
aluminium.
stainless steel.
phosphor bronze.
carbon.
aluminium.
Answer
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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)
T∝ P
T∝ P²
T is independent of P
T∝ P³
T∝ P
T∝ P²
T is independent of P
T∝ P³
Answer
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Electrical Machines
Synchronising power of a synchronous motor varies
All of these
directly as Xs2
directly as synchronous reactances Xs
inversely as 1/Xs
All of these
directly as Xs2
directly as synchronous reactances Xs
inversely as 1/Xs
Answer
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