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Electrical Machines

Electrical Machines
Diverters are used only in

None of these
 either of these
 series motors
 shunt motors

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 1.24.
 0.72.
 0.25.
 0.62.

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 96 V
 384 V
 768 V
 192 V

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Electrical Machines
Speed of DC motor can be controlled by varying

 applied voltage.
 its flux oer pole.
 all of these.
 resistance of armature culture.

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Electrical Machines
The working principle of transformer depends on

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

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Electrical Machines
An electric motor with constant output power will have a torque speed characteristics in the form of a

 Straight line parallel to the speed axis.
 Rectangular hyperbola
 Circle about the origin.
 Straight line through the origin.

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