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Electrical Machines

Electrical Machines
If input of a transformer is square wave the output will be

 sine wave.
 square wave.
 triangular wave.
  pulsed wave.

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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

 changing the load.
 varying the speed.
 varying the applied voltage.
 changing the field excitation.

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmax to Imax.
 Vmin to Imin.
 Vmin to Imax.
 Vmax to Imin.

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Electrical Machines
The speed regulation of a DC motor is given as

 (NfL − NnL)/NnL.
 NnL/NfL.
 NnL − NfL.
 (NnL − NfL)/NfL.

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 60
 660
 600
 40

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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

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

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