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Electrical Machines

Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sin2δ
 sinδ
 cosδ
 cos2δ

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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will

 Remain unaltered.
 Increase.
 Reduce.
 Oscillate around the normal speed.

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Electrical Machines
The armature shaft must be able to with stand

All of these
 Any unbalanced magnetic pull on the armature core.
 Bending moment due to weight of the armature.
 Twisting stains due to transmission of torque.

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 -0.08
 -1.92
 1.92
 0.08

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Electrical Machines
The working principle of transformer depends on

 Coulombs law.
 Amperes law.
 Newtons law.
 Faradays law of electromagnetic induction.

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Electrical Machines
A DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 67.5%
 78.5%
 82.5%
 72.5%

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