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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will
remain nearly constant
increase to rated voltage and then may decrease
increase gradually and then stay at rated voltage
decrease
remain nearly constant
increase to rated voltage and then may decrease
increase gradually and then stay at rated voltage
decrease
Answer
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Related Question
Electrical Machines
Which of the following pairs is/are correct?
semi closed slot-----leakage flux is moderate
All of these
closed slot----- leakage flux is high
open slot----- leakage flux is less
semi closed slot-----leakage flux is moderate
All of these
closed slot----- leakage flux is high
open slot----- leakage flux is less
Answer
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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?
DC Shunt Motor
Synchronous motor.
AC single phase motor.
Induction motor.
DC Shunt Motor
Synchronous motor.
AC single phase motor.
Induction motor.
Answer
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Electrical Machines
Fufuraldehyde analysis is done to determine the
condition of oil in transformer.
condition of cork gaskets used in transformer.
condition of lamination on CRGO steel sheet.
condition of paper insulation in transformer.
condition of oil in transformer.
condition of cork gaskets used in transformer.
condition of lamination on CRGO steel sheet.
condition of paper insulation in transformer.
Answer
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Electrical Machines
Transformer cooling and insulating oil must be of
high viscosity.
low BDV.
low viscosity.
low resistivity.
high viscosity.
low BDV.
low viscosity.
low resistivity.
Answer
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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by
E1 / E2 = 1.
E1 / E2 = N1kw1 / N2kw2.
E1 / E2 = f1kw1 / f2kw2.
E1 / E2 = N1 / N2.
E1 / E2 = 1.
E1 / E2 = N1kw1 / N2kw2.
E1 / E2 = f1kw1 / f2kw2.
E1 / E2 = N1 / N2.
Answer
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