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Electrical Machines
In synchronous generator V curve is drawn between
field current on X-axis and armature current on Y-axis.
field current on Y-axis and armature current on X-axis.
field current on X-axis and power factor on Y-axis.
either of these.
field current on X-axis and armature current on Y-axis.
field current on Y-axis and armature current on X-axis.
field current on X-axis and power factor on Y-axis.
either of these.
Answer
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Related Question
Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is
3000 rpm
1500 rpm
1000 rpm
750 rpm
3000 rpm
1500 rpm
1000 rpm
750 rpm
Answer
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Electrical Machines
In a DC generator, the armature reaction results in
magnetization of inter poles.
magnetization of leading and demagnetization of trailing pole tip.
demagnetization of leading & magnetization of trailing pole tip.
demagnetization of centers of poles.
magnetization of inter poles.
magnetization of leading and demagnetization of trailing pole tip.
demagnetization of leading & magnetization of trailing pole tip.
demagnetization of centers of poles.
Answer
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Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.
40 volts.
30 volts.
10 volts.
20 volts.
40 volts.
30 volts.
10 volts.
20 volts.
Answer
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Electrical Machines
Consider the following statements regarding the speed control of dc motors : 1. ward-leonard method is suitable forconstant-torque drives 2. Ward-leonard method is suitable for constant-power drives 3. field-control method facilitates speed control below base speed 4. Armature-resistance control method is more efficient than ward-leanard method 5. Field-control method is suitable for constant-torque drives 6. Armature-resistance control method is suitable for constant-torque drives From these, the correct answer is
1, 4, 6
1, 2, 6
1, 3, 5
1, 2, 5
1, 4, 6
1, 2, 6
1, 3, 5
1, 2, 5
Answer
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Electrical Machines
Demagnetization effects which of the following?
reduces the terminal voltage
both B and C
reduction in main field flux
commutation
reduces the terminal voltage
both B and C
reduction in main field flux
commutation
Answer
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