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Electrical Machines
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by
KhfBm3.
Khf2Bm1.6.
KhfBm1.6.
KhfBm.
KhfBm3.
Khf2Bm1.6.
KhfBm1.6.
KhfBm.
Answer
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Related Question
Electrical Machines
Consider the following statements about commutating poles which are fitted on most large dc Shunt motors: 1. The commutating poles are placed in the geometric neutral plane and their number is usually Equal to the number of main poles 2. The winding on the commutating poles is connected in series with the shunt-field winding on the main poles 3. The polarity of the commutating pole must be that of the next pole further ahead 4. The commutating poles neutralize the reactance voltage produced in the coil undergoing Commutation. Of these statements,
1, 2 and 4 are correct
1, 2 and 3 are correct
1 and 4 are correct
2, 3 and 4 are correct
1, 2 and 4 are correct
1, 2 and 3 are correct
1 and 4 are correct
2, 3 and 4 are correct
Answer
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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be
2000 rpm
250 rpm
1000 rpm
500 rpm
2000 rpm
250 rpm
1000 rpm
500 rpm
Answer
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Electrical Machines
In which of the following generators negative voltage regulation can occur?
shunt generator
both B and C
series generators
over compound generator
shunt generator
both B and C
series generators
over compound generator
Answer
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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor
Decreases.
Oscillates around the rated speed.
Remains unchanged.
Increases.
Decreases.
Oscillates around the rated speed.
Remains unchanged.
Increases.
Answer
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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?
None of these
Synchronous speed
Zero
Slip speed
None of these
Synchronous speed
Zero
Slip speed
Answer
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