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Electrical Machines

Electrical Machines
A DC generator can be considered as

 prime mover.
 rectifier.
 rotating amplifier.
 power pump.

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Electrical Machines
In synchronous generator V curve is drawn between

 either of these.
 field current on Y-axis and armature current on X-axis.
 field current on X-axis and power factor on Y-axis.
 field current on X-axis and armature current on Y-axis.

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Electrical Machines
In DC machine shape of main field flux distribution is?

 flat tapped or trapezoidal
 peaky in nature
 saddle shape
 triangular

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 150 V.
 280 V.
 220 V.
 240 V.

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 half wave
 full wave controlled
 full wave
 half wave controlled

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Electrical Machines
Which type of motors are preferred in lifts?

 DC compound motors.
 DC series motors.
None of these
 DC shunt motors.

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