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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 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is
6 ohms.
5.7 ohms.
2.2 ohms.
1.9 ohms.
6 ohms.
5.7 ohms.
2.2 ohms.
1.9 ohms.
Answer
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Related Question
Electrical Machines
If we increase the rotor reactance value, the maximum torque will
increase
decrease
None of these
not changed
increase
decrease
None of these
not changed
Answer
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Electrical Machines
Resistance commutation is used generally in case of
None of these
DC machines above 10 kW.
fractional kW DC machines.
DC machines bellow 5 kW.
None of these
DC machines above 10 kW.
fractional kW DC machines.
DC machines bellow 5 kW.
Answer
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Electrical Machines
A 3 - φ induction motor can also be referred to as a
shunt motor.
transformer.
repulsion motor.
asynchronous motor.
shunt motor.
transformer.
repulsion motor.
asynchronous motor.
Answer
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Electrical Machines
Armature reaction in dc motor results
open circuit.
short circuit.
decrease in speed.
increase in speed.
open circuit.
short circuit.
decrease in speed.
increase in speed.
Answer
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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is
1, 3, 5
1, 2, 5
2, 3, 4
1, 2, 3, 4
1, 3, 5
1, 2, 5
2, 3, 4
1, 2, 3, 4
Answer
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