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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 more.
 between 50% and 90%.
 same.
 less than 50%.

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Electrical Machines
Which of the following motors is/are widely used?

 squirrel cage induction motor
 slip ring induction motor
None of these
 either of these

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

 series generator
 differentially compounded generator
 cumulatively compounded generator
 shunt generator

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Electrical Machines
Which of the following generators are used in arc welding?

 cumulative compound generators
 shunt generators
 differential compound generators
 series generators

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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

 57.1%.
 88.8%.
 48.0%.
 59.2%.

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Electrical Machines
Swinburne test is conducted under which of the following condition?

 full load
 no load
 any of the above
 half load

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