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Electrical Machines

Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/120.
 PN/2.
 PN/3000.
 PN/60.

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Electrical Machines
In an auto-transformer, power is transferred through

 induction process only.
 conduction process only.
 both A and B.
None of these

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Electrical Machines
which of the following losses are negligible in blocked rotor test?

 iron loss
 copper loss
 mechanical loss
 both A and B

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 1130 r.p.m.
 none of above.
 4575.4 r.p.m.
 1037.5 r.p.m.

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Electrical Machines
For pure resistive load what is the armature reaction?

All of these
 cross magnetization
 magnetization
 demagnetization

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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is

 2, 3, 4, 5
 2, 3 ,5
 2, 3, 4
 1, 2, 3

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