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Electrical Machines
The principal of starting of 3 - Φ IM is similar to
synchronous motor.
repulsion motor type starting.
capacitor run IM.
transformer with short-circuited secondary.
synchronous motor.
repulsion motor type starting.
capacitor run IM.
transformer with short-circuited secondary.
Answer
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Related Question
Electrical Machines
What are the starters used for starting of cage motors?
All of these.
Star-delta starter.
DOL starter.
Auto transformer starter.
All of these.
Star-delta starter.
DOL starter.
Auto transformer starter.
Answer
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Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:
25 Hz.
100 Hz.
Zero Hz.
50 Hz.
25 Hz.
100 Hz.
Zero Hz.
50 Hz.
Answer
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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor
in parallel with the shunt field
in parallel with the series field
in series with the shunt field
in series with the series field
in parallel with the shunt field
in parallel with the series field
in series with the shunt field
in series with the series field
Answer
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Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards
direction of flux.
opposite to the direction of motion of the conductor.
direction of motion of the conductor.
direction of induced emf.
direction of flux.
opposite to the direction of motion of the conductor.
direction of motion of the conductor.
direction of induced emf.
Answer
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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is
1.06
0.87
0.96
0.95
1.06
0.87
0.96
0.95
Answer
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