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Electrical Machines

Electrical Machines
Eddy current loss will depends on

All of these
 Frequency
 Thickness
 Flux density

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 500 VA
 100 VA
 110 VA
 550 VA

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Electrical Machines
Direction of rotation of DC motor is reversed by

 Reversing supply connection.
 Adding resistance to field circuit.
 Interchanging armature and field connection.
 Reversing armature connection or field connection.

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

 48 Hz
 50 Hz
 45 HZ
 48.5 Hz

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Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.

 10 volts.
 20 volts.
 30 volts.
 40 volts.

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

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

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