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Electrical Machines

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

 not run.
 burn.
 run at normal speed.
 run at lower speed.

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = 2/P*ωm
 ωe = P*ωm
 ωe = P/2*ωm
 ωe = ωm

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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

  E1 / E2 = N1kw1 / N2kw2.
  E1 / E2 = 1.
  E1 / E2 = f1kw1 / f2kw2.
  E1 / E2 = N1 / N2.

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 69 / 3.
  slip X 59 / 3.
  slip X 50 / 3.
 1.

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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

 2 and 3
 1 and 3
 1 and 2
 1, 2 and 3

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Electrical Machines
In DC generator, lap winding is used in

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

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