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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.
increased.
remains same.
kept constant to certain value.
decreased.
increased.
remains same.
kept constant to certain value.
decreased.
Answer
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Related Question
Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.
133.22 N-m
234.76 N-m.
266.20 N-m.
can not be determined.
133.22 N-m
234.76 N-m.
266.20 N-m.
can not be determined.
Answer
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Electrical Machines
The starting resistance of DC motor is generally
Infinitely large.
Low.
1000 ohms.
around 500 ohms.
Infinitely large.
Low.
1000 ohms.
around 500 ohms.
Answer
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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be
234 V
240 V
6 V
474 V
234 V
240 V
6 V
474 V
Answer
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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be
65 V
230 V
115 V
460 V
65 V
230 V
115 V
460 V
Answer
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Electrical Machines
In a 3 - ÃŽÂ¦ wound rotor induction motor the short circuit gear is used to short circuit the
stator phases of the motor.
rotor at slip rings.
None of these
starting resistance in the starter.
stator phases of the motor.
rotor at slip rings.
None of these
starting resistance in the starter.
Answer
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