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Electrical Machines

Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 √3
 3
 1/3
 1/√3

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 less than 6 V
 zero
 6 V
 more than 6 V

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Electrical Machines
Which of the following will vary the maximum torque?

 both 1 and 2
 rotor reactance X
None of these
 rotor resistance R

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 0 V
 4 V
 2 V
 1 V

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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 less than 90o.
 0o.
 Greater than 90o.
 90o.

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Electrical Machines
Synchronous reactance of an alternator represents

 field winding reactance
 a reactance operating at synchronous speed
All of these
 armature reactance and leakage reactance

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