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Electrical Machines

Electrical Machines
Reactive power generated or delivered significantly depends on

 load angle.
 frequency.
 excitation.
 both 1 and 2.

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Electrical Machines
Counter emf of a DC motor

 helps in energy conversion.
 regulates its armature voltage.
 exceeds supply voltage
 aids applied voltage.

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Electrical Machines
Which of the following is/are not a self starting motor?

None of these
 1-phase induction motor
 3-phase induction motor
 both 1 and 2

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Electrical Machines
In case of IM the torque is

  inversely proportional to slip.
  inversely proportional to √slip.
  directly proportional to slip.
  directly proportional to slip2.

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  all of these.
  negative sequence current.
  less heating of the rotor.
  less heating of the rotor.

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Electrical Machines
Two generators G1 and G2 are to be operated in parallel to deliver a total current of 60 A. Generator one has a terminal voltage of 280 V on no load and 240 V when supplying 40 A current. Similarly the second generator has a voltage of 300 V when on no load and 240 V when supplying of 50 A of current. The output voltage of each generator will be

 271.7 V.
  256.4 V.
 240 V.
 238.2 V.

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