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Electrical Machines

Electrical Machines
From no load to full load the slip will

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

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 4575.4 r.p.m.
 1130 r.p.m.
 1037.5 r.p.m.
 none of above.

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

  Transistor series regulator.
None of these
  Zener diode shunt regulator.
  Transistor shunt regulator.

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Electrical Machines
The power factor of squirrel cage induction motor is

 low at light loads only
 low at rated load only
 low at heavy loads only
 both A and B

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Electrical Machines
The condition for maximum running torque is

 0.707 lagging
 zero
 R = S.X
 unity
 0.5 lagging

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

 20 V.
 0 V.
  40 V.
 60 V.

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