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Electrical Machines
Under commutation results in
no sparking.
sparking at the leading edge of the brush.
sparking the trailing edge of the brush.
sparking at the middle of the brush.
no sparking.
sparking at the leading edge of the brush.
sparking the trailing edge of the brush.
sparking at the middle of the brush.
Answer
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Related Question
Electrical Machines
The type of DC motor generally used for shears and punches is
Cummulative compound motor.
Differential compound motor.
Series motor.
Shunt motor.
Cummulative compound motor.
Differential compound motor.
Series motor.
Shunt motor.
Answer
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Electrical Machines
Compensating windings is placed in which part of a D.C motor?
On armature.
On yoke in the inter pole gap.
On yoke in the pole faces.
None of these
On armature.
On yoke in the inter pole gap.
On yoke in the pole faces.
None of these
Answer
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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is
3000 rpm.
3600 rpm.
500 rpm.
600 rpm.
3000 rpm.
3600 rpm.
500 rpm.
600 rpm.
Answer
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Electrical Machines
When the mechanical power is developed by a DC motor maximum
back emf is equal to applied voltage.
Back emf is equal.
None of above.
Back emf is equal to half of applied voltage.
back emf is equal to applied voltage.
Back emf is equal.
None of above.
Back emf is equal to half of applied voltage.
Answer
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Electrical Machines
In auto transformer if the turn ratio is K, what is the power transferred inductively?
K × input power
(1-K) × input power
both A and B
None of these
K × input power
(1-K) × input power
both A and B
None of these
Answer
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