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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?
either of these
exactly opposite
same
None of these
either of these
exactly opposite
same
None of these
Answer
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Related Question
Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?
3200 W and 5200 W
1600 W and 5000 W
1600 W and 1250 W
3200 W and 2500 W
3200 W and 5200 W
1600 W and 5000 W
1600 W and 1250 W
3200 W and 2500 W
Answer
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Electrical Machines
Field weakening method is also called as-----------?
constant current control
constant torque control
constant voltage control
constant power control
constant current control
constant torque control
constant voltage control
constant power control
Answer
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Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.
920 RPM
940 RPM
960 RPM
970 RPM
920 RPM
940 RPM
960 RPM
970 RPM
Answer
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Electrical Machines
Hopkinss test in DC motor is conducted at ?
Full load.
Low load.
None of these.
No load.
Full load.
Low load.
None of these.
No load.
Answer
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Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then
its efficiency will improve
its power factor will reduce
its speed will increase
its speed will reduce
its efficiency will improve
its power factor will reduce
its speed will increase
its speed will reduce
Answer
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