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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is
2, 3 ,5
2, 3, 4
1, 2, 3
2, 3, 4, 5
2, 3 ,5
2, 3, 4
1, 2, 3
2, 3, 4, 5
Answer
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Related Question
Electrical Machines
Hunting in a synchronous motor takes place
when load varies.
when supply voltage fluctuates.
motor is under loaded.
when power factor is unity.
when load varies.
when supply voltage fluctuates.
motor is under loaded.
when power factor is unity.
Answer
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Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will
increase by 100%
reduced to half
increase by 200%
remain unaltered
increase by 100%
reduced to half
increase by 200%
remain unaltered
Answer
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Electrical Machines
In a DC generator, the armature reaction results in
demagnetization of centers of poles.
magnetization of leading and demagnetization of trailing pole tip.
magnetization of inter poles.
demagnetization of leading & magnetization of trailing pole tip.
demagnetization of centers of poles.
magnetization of leading and demagnetization of trailing pole tip.
magnetization of inter poles.
demagnetization of leading & magnetization of trailing pole tip.
Answer
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Electrical Machines
In a DC machine, the angle between the stator and rotor fields is
90o.
0o.
180o.
dependent upon the load.
90o.
0o.
180o.
dependent upon the load.
Answer
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Electrical Machines
Which of the following methods are used to control the speed of DC motors is
armature circuit resistance control
supply voltage control
field current control
All of these
armature circuit resistance control
supply voltage control
field current control
All of these
Answer
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