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ELECTRICAL MACHINES

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 100 Hz
 0 Hz
 50 Hz
 25 Hz

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 interpole and compensating windings together
 interpole winding
 armature winding
 field winding

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Electrical Machines
A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is

 3 only
 1, 2 and 3
 1, 2, 3 and 4
 1, 3

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 230 V
 some what more than 230 V
 some what less than 230 V
 not possible

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 more than 6 V
 6 V
 zero
 less than 6 V

ANSWER DOWNLOAD EXAMIANS APP
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