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Electrical Machines

Electrical Machines
From no load to full load the slip will

 slightly increase.
 slightly decrease.
None of these
 not change.

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Electrical Machines
In DC generator, lap winding is used in

  high current and low voltage applications.
 high voltage and low current applications.
 where greater load is connected.
 where constant speed is required.

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Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 4/3.
 16/9.
 3/4.
 9/16.

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Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 600 W
 625 W
 650 W
 700 W

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 10Ω
 50Ω
 200Ω
 100Ω

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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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