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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 net voltage across the armature resistance at the time of plugging will be
240 V
474 V
234 V
6 V
240 V
474 V
234 V
6 V
Answer
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Related Question
Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are
1/3, 1/√3
1/3, 1/3
1/√3, 1/3
1/√3, 1/√3
1/3, 1/√3
1/3, 1/3
1/√3, 1/3
1/√3, 1/√3
Answer
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Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is
2%
4%
25%
5%
2%
4%
25%
5%
Answer
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Electrical Machines
The slip of an induction motor during DC rheostatic braking is
s.
1 - s.
2 - s.
2 + s.
s.
1 - s.
2 - s.
2 + s.
Answer
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Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?
10%
5%
19%
40%
10%
5%
19%
40%
Answer
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Electrical Machines
In which of the following generators negative voltage regulation can occur?
over compound generator
both B and C
series generators
shunt generator
over compound generator
both B and C
series generators
shunt generator
Answer
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