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Electrical Machines
To avoid formation of grooves in the commutator
brush position has no effect on the commutator grooving.
None of these
the brushes of opposite polarity should track each other.
the brushes of same polarity should track each other.
brush position has no effect on the commutator grooving.
None of these
the brushes of opposite polarity should track each other.
the brushes of same polarity should track each other.
Answer
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Related Question
Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be
PN/60.
PN/3000.
PN/120.
PN/2.
PN/60.
PN/3000.
PN/120.
PN/2.
Answer
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Electrical Machines
A crusher is equipped with
Reluctance motor.
Synchronous motor.
DC shunt motor.
Slip ring induction motor.
Reluctance motor.
Synchronous motor.
DC shunt motor.
Slip ring induction motor.
Answer
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Electrical Machines
The power factor of squirrel cage induction motor is
low at heavy loads only
low at rated load only
low at light loads only
both A and B
low at heavy loads only
low at rated load only
low at light loads only
both A and B
Answer
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Electrical Machines
What is power factor of a 3 - φ induction motor at no load?
Equal to 1.
High.
Low.
Same as full load.
Equal to 1.
High.
Low.
Same as full load.
Answer
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Electrical Machines
In case of IM the torque is
inversely proportional to √slip.
directly proportional to slip2.
directly proportional to slip.
inversely proportional to slip.
inversely proportional to √slip.
directly proportional to slip2.
directly proportional to slip.
inversely proportional to slip.
Answer
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