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Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is
9/16.
3/4.
16/9.
4/3.
9/16.
3/4.
16/9.
4/3.
Answer
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Related Question
Electrical Machines
What is the necessity of copper brushes in a dc motors?
To convert alternating supply current to direct current.
To increase the flux cutting by the rotor.
None of these.
To absorb the mechanical shocks produced during running condition.
To convert alternating supply current to direct current.
To increase the flux cutting by the rotor.
None of these.
To absorb the mechanical shocks produced during running condition.
Answer
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Electrical Machines
The armature resistance of the dc motor is generally of the range
0.1 ohm.
50 ohm.
100 ohm.
0.5 ohm.
0.1 ohm.
50 ohm.
100 ohm.
0.5 ohm.
Answer
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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor
Remains same.
Decrease.
Increase.
None of these.
Remains same.
Decrease.
Increase.
None of these.
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
15.1 Ω
31.9 Ω
15.9 Ω
31.1 Ω
15.1 Ω
31.9 Ω
15.9 Ω
31.1 Ω
Answer
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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire
to reduce the insulation of materials.
in order to reduce eddy current to provide large flux.
as it carries large load current.
to provide large flux.
to reduce the insulation of materials.
in order to reduce eddy current to provide large flux.
as it carries large load current.
to provide large flux.
Answer
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