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Electrical Machines
A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required
0.45 Ω.
0.66 Ω.
0.78 Ω.
0.24 Ω.
0.45 Ω.
0.66 Ω.
0.78 Ω.
0.24 Ω.
Answer
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Related Question
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
5.7 ohms.
6 ohms.
1.9 ohms.
2.2 ohms.
5.7 ohms.
6 ohms.
1.9 ohms.
2.2 ohms.
Answer
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Electrical Machines
Which of the following voltage regulation method is accurate ?
Synchronous impedance method
American standard association method
ZPF method
MMf method
Synchronous impedance method
American standard association method
ZPF method
MMf method
Answer
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Electrical Machines
Which of following motor is preferred for belt conveyor?
Universal motor.
Slip ring induction motor.
Reluctance motor.
Synchronous motors.
Universal motor.
Slip ring induction motor.
Reluctance motor.
Synchronous motors.
Answer
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Electrical Machines
Two DC generators having equal open-circuit emfs but slight different load characteristics are operating in parallel, then
None of these
the machine with more drooping characteristic will supply less load.
the machine with more drooping characteristic will supply more load.
the machine will share load equally.
None of these
the machine with more drooping characteristic will supply less load.
the machine with more drooping characteristic will supply more load.
the machine will share load equally.
Answer
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Electrical Machines
The function of field regulator in a DC compound motor is to
vary the armature resistance.
limit the armature current.
none of above.
control field current.
vary the armature resistance.
limit the armature current.
none of above.
control field current.
Answer
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