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Electrical Machines
In a transformer
both Oc and SC tests are conducted on HV side
both OC and SC tests are conducted on LV side
OC test is conducted on LV side and SC test is conducted on HV side
OC test is conducted on HV side and SC test is conducted on LV side
both Oc and SC tests are conducted on HV side
both OC and SC tests are conducted on LV side
OC test is conducted on LV side and SC test is conducted on HV side
OC test is conducted on HV side and SC test is conducted on LV side
Answer
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Related Question
Electrical Machines
A series motor is efficiently suitable for
low starting torque operation.
high starting torque operation.
none of these.
constant speed operation.
low starting torque operation.
high starting torque operation.
none of these.
constant speed operation.
Answer
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Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of
Both of above.
Heavy sparking at the first stud of starting resistance steps.
Heavy sparking at brushes.
None of these.
Both of above.
Heavy sparking at the first stud of starting resistance steps.
Heavy sparking at brushes.
None of these.
Answer
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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at
750rpm
zero speed
1500 rpm
1000 rpm
750rpm
zero speed
1500 rpm
1000 rpm
Answer
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Electrical Machines
The slip of an induction motor normally does not depend on
synchronous speed.
core loss component.
rotor speed.
shaft torque.
synchronous speed.
core loss component.
rotor speed.
shaft torque.
Answer
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Electrical Machines
In a synchronous generator with constant steam input supplies power to an infinite bus at a lagging power factor. If the excitation is increased
both power angle and power factor increase
both power angle and power factor decrease
power angle decrease and power factor increase
power angle increase and power factor decrease
both power angle and power factor increase
both power angle and power factor decrease
power angle decrease and power factor increase
power angle increase and power factor decrease
Answer
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