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Electrical Machines

Electrical Machines
Armature resistance control method is used for the _______ ?

 below rated speed
None of these
 both 1 and 2
 above rated speed

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 less and thick
 less and thin
 large and thin
 large and thick

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 500W
 100W
 1000W
 3000W

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Electrical Machines
A DC generator beyond critical resistance will generate

 maximum current.
 maximum power.
 maximum voltage.
 no voltage.

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 50 KVA
 100 KVA
 123.3 KVA
 83.33 KVA

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

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

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