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Electrical Machines
Which 1 - Φ motor does operate at high power factor?
Capacitor start.
Split phase.
Shaded pole.
Capacitor run.
Capacitor start.
Split phase.
Shaded pole.
Capacitor run.
Answer
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Related Question
Electrical Machines
Two transformers operating in parallel will share the load depending on their
efficiency
per unit impedance
leakage reactance
ratings
efficiency
per unit impedance
leakage reactance
ratings
Answer
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Electrical Machines
A 3 stack stepper motor has 12 teeth on stator as well as on rotor. Determine the step size when each stack excited?
45°.
24°.
30°.
10°.
45°.
24°.
30°.
10°.
Answer
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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be
1.8 9 Ω
3.1 Ω
1.79 Ω
2 .1 Ω
1.8 9 Ω
3.1 Ω
1.79 Ω
2 .1 Ω
Answer
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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be
112.5 W
75 W
50 W
168.75 W
112.5 W
75 W
50 W
168.75 W
Answer
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Electrical Machines
In DC machine shape of armature MMF wave is?
Triangular and directed towards brush axis.
Triangular and directed towards main pole.
Saddle shape.
Peaky in nature.
Triangular and directed towards brush axis.
Triangular and directed towards main pole.
Saddle shape.
Peaky in nature.
Answer
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