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Electrical Machines
The short circuit test on a transformer is conducted to obtain
eddy current loss.
hysteresis loss.
core loses only.
copper losses.
eddy current loss.
hysteresis loss.
core loses only.
copper losses.
Answer
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Related Question
Electrical Machines
In dc machine armature windings are placed on rotor because of the necessity for
development of torque.
generation of voltage.
commutation.
electromechanical energy conversion.
development of torque.
generation of voltage.
commutation.
electromechanical energy conversion.
Answer
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Electrical Machines
What is the frequency of a alternator, if P = number of poles and N = revolution made per second?
120N / P Hz.
PN / 2 Hz.
120P / N Hz.
120 / PN Hz.
120N / P Hz.
PN / 2 Hz.
120P / N Hz.
120 / PN Hz.
Answer
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Electrical Machines
Flux density under trailing pole tips in case of generator will
either increase or decrease
increase
decrease
None of these
either increase or decrease
increase
decrease
None of these
Answer
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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?
30 V.
40 V.
60 V.
90 V.
30 V.
40 V.
60 V.
90 V.
Answer
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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?
Single phase induction motor.
DC series motor.
Synchronous motor.
AC slip ring motor.
Single phase induction motor.
DC series motor.
Synchronous motor.
AC slip ring motor.
Answer
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