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Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?
Separately excited.
Compound.
Series.
Shunt.
Separately excited.
Compound.
Series.
Shunt.
Answer
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Related Question
Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be
625 W
600 W
700 W
650 W
625 W
600 W
700 W
650 W
Answer
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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by
using the magnetic core of low reluctance.
using soft material for winding.
using transformer oil of better quality.
increasing the number of turns.
using the magnetic core of low reluctance.
using soft material for winding.
using transformer oil of better quality.
increasing the number of turns.
Answer
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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is
31.1 Ω
31.9 Ω
15.9 Ω
15.1 Ω
31.1 Ω
31.9 Ω
15.9 Ω
15.1 Ω
Answer
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Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with
heavy short-circuited end rings.
heavy copper or aluminium bars placed in rotor slots.
three phase winding.
single phase winding.
heavy short-circuited end rings.
heavy copper or aluminium bars placed in rotor slots.
three phase winding.
single phase winding.
Answer
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Electrical Machines
In a DC Motor 3 point starter is used to
limit the starting current to a safer value.
provide overload protection.
provide protection against Low-Voltage.
all of above.
limit the starting current to a safer value.
provide overload protection.
provide protection against Low-Voltage.
all of above.
Answer
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