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Electrical Machines

Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 increase
 decrease
None of these
 either increase or decrease

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Electrical Machines
The DC compound motors are generally

 None of these.
 Cummulative compound.
 Differentical compound.
 Level Compound.

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Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

 none of these.
 increase.
 remains same.
 Decrease.d

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 30°
 72°
 18°
 36°

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 90 V.
 30 V.
 60 V.
 40 V.

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