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Electrical Machines

Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

  45°C.
 35°C.
 32°C.
 27°C.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 94%
 96%
 95%
 92%

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

  Full load.
 No load.
 None of these.
 Low load.

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Electrical Machines
The type of DC generator used for arc welding purpose is a

 shunt generator
 differentially compounded generator
 cumulatively compounded generator
 series generator

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 20 volts.
 10 volts.
 40 volts.
 30 volts.

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Electrical Machines
Poles of DC machine are often laminated to

 reduce pulsation loss.
 reduce iron weight.
 reduce armature reaction.
 dissipate more heat.

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