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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 0°
 70° to 85°
 90°
 25° to 30°

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 1-S
 1/S
 2-S
 S

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Electrical Machines
Armature reaction in DC generators will result in

 reduction in generated emf.
 short circuit.
 open circuit.
 increase in slip.

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Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

 541.67V, 200 rpm.
 541.67V, 250 rpm.
 2166.67V, 230 rpm.
 2166.67V, 270 rpm.

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

All of these
 Collecting of large current is simple.
 Insulation requirement is less.
 Operating cost is less.

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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

All of these
 2 point starter
 4 point starter
 3 point starter

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