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Electrical Machines

Electrical Machines
The principle of dynamically induced emf is utilized in

 thermocouple.
 generator.
 transformer.
 choke.

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 large and thick
 less and thick
 less and thin
 large and thin

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Electrical Machines
Direct axis reactance is defined as the ratio of

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

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

 none of these.
 Decrease.d
 remains same.
 increase.

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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, 2 and 3
 1 and 3
 1 and 2

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Electrical Machines
Which of the following is/are effects of armature reaction?

 increase the maintenance and repair
 increases the design cost
All of these
 increase the iron loss

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