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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is
5.7 Ω
1.9 Ω
2.2 Ω
6 Ω
5.7 Ω
1.9 Ω
2.2 Ω
6 Ω
Answer
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Related Question
Electrical Machines
In electric locomotives which of the following motor are used ?
Synchronous motor.
DC series motor.
DC Shunt motor.
DC compound motor.
Synchronous motor.
DC series motor.
DC Shunt motor.
DC compound motor.
Answer
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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?
2.
6.
data provided is insufficient.
4.
2.
6.
data provided is insufficient.
4.
Answer
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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is
2, 4
1, 4
2, 3
1, 3
2, 4
1, 4
2, 3
1, 3
Answer
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Electrical Machines
Iron loss in a transformer mainly occurs in
iron made tank of transformer.
winding of transformer.
steel core in transformer.
transformer insulating oil.
iron made tank of transformer.
winding of transformer.
steel core in transformer.
transformer insulating oil.
Answer
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Electrical Machines
In DC shunt motor if load is increased, the speed
reduce slightly.
increased slightly.
increase proportional.
remains constant.
reduce slightly.
increased slightly.
increase proportional.
remains constant.
Answer
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