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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 440 A.
 400 A.
 44 A.
 40 A.

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Electrical Machines
The inertia constant H of a synchronous condenser is

 equal to that of the effective length of the line.
  none of these.
 greater than that of hydro generator.
 greater than that of turbo alternator.

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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would

 remain unchanged
 be less than 10%
 be more than 10%
 be 12.5%

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Electrical Machines
If a DC motor is connected across the AC supply it will

  Burn.
 Run at lower speed.
 Run at normal speed.
 Not run.

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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V, I/2 and P/2
 V/2, I and P/2
 V/2, I/2 and P/4
 V, I and P

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Electrical Machines
In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will

None of these
 either increase or decrease
 increase
 decrease

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