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Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is
zero
leading
unity
lagging
zero
leading
unity
lagging
Answer
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Related Question
Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would
decrease.
None of above.
increase.
not change.
decrease.
None of above.
increase.
not change.
Answer
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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is
R1 /K²
K×R1
R1 /K
K²R1
R1 /K²
K×R1
R1 /K
K²R1
Answer
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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is
2, 4
1, 4
1, 3
2, 3
2, 4
1, 4
1, 3
2, 3
Answer
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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.
semi closed or semi opened.
always opened.
always closed.
none.
semi closed or semi opened.
always opened.
always closed.
none.
Answer
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Electrical Machines
The frame of an induction motor is made of
stainless steel.
aluminium.
silicon steel.
closed grained cast iron.
stainless steel.
aluminium.
silicon steel.
closed grained cast iron.
Answer
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