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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?
zero
1470 rpm
30 rpm
1500 rpm
zero
1470 rpm
30 rpm
1500 rpm
Answer
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Related Question
Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is
Inversely proportional to the armature current.
None of above.
Proportional to the square of armature current.
Proportional to the armature current.
Inversely proportional to the armature current.
None of above.
Proportional to the square of armature current.
Proportional to the armature current.
Answer
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Electrical Machines
A 4 pole dynamo with wave wound armature has 51 slots contains 20 conductors in each slot. If induced emf 357 Volts and speed is 8500 rpm, flux per pole will be
2.7 mWb.
1.2 mWb.
3.5 mWb.
1.4 mWb.
2.7 mWb.
1.2 mWb.
3.5 mWb.
1.4 mWb.
Answer
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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by
sf / 2.
s2.
sf.
f / s.
sf / 2.
s2.
sf.
f / s.
Answer
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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as
2 mg of KOH / gm.
0.5 mg of KOH / gm.
1 mg of KOH / gm.
0.3 mg of KOH / gm.
2 mg of KOH / gm.
0.5 mg of KOH / gm.
1 mg of KOH / gm.
0.3 mg of KOH / gm.
Answer
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Electrical Machines
Which of the following statement is true for an AC synchronous motor?
It is a variable speed motor.
It is a constant speed motor.
It is a high reluctance motor.
It is a step angled motor.
It is a variable speed motor.
It is a constant speed motor.
It is a high reluctance motor.
It is a step angled motor.
Answer
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