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Electrical Machines

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

 full load
 half load
 any of the above
 no load

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Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  skewing.
  crawling.
  slip.
  cogging.

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the starting torque becomes low.
 the motor may run away.
 the motor may not start.
 the starting current will be enormously high.

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 remain unchanged.
 aprroach infinity.
 approach zero.
 between zero and infinity.

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 20 V
 40 V
 50 V
 zero

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Electrical Machines
Open circuit in a transformer is prefered with

 rated transformer current
 rated transformer voltage
 high frequency supply
 direct current

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