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Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is
of low resistivity.
lighter in weight.
easy to cast owing to its low melting point and is easily available.
cheaper in cost.
of low resistivity.
lighter in weight.
easy to cast owing to its low melting point and is easily available.
cheaper in cost.
Answer
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Related Question
Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?
1450.
1500.
1440.
1435.
1450.
1500.
1440.
1435.
Answer
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Electrical Machines
Which machine is used for battery charging?
Compounded DC generator.
DC series generator.
None of these.
DC shunt generator.
Compounded DC generator.
DC series generator.
None of these.
DC shunt generator.
Answer
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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?
Induction motor.
AC single phase motor.
DC Shunt Motor
Synchronous motor.
Induction motor.
AC single phase motor.
DC Shunt Motor
Synchronous motor.
Answer
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Electrical Machines
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is
ineffective.
demagnetizing.
cross – magnetizing.
magnetizing.
ineffective.
demagnetizing.
cross – magnetizing.
magnetizing.
Answer
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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of
Line current.
None of above.
Field current.
Armature current.
Line current.
None of above.
Field current.
Armature current.
Answer
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