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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are
1/√3, 1/√3
1/3, 1/3
1/3, 1/√3
1/√3, 1/3
1/√3, 1/√3
1/3, 1/3
1/3, 1/√3
1/√3, 1/3
Answer
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Related Question
Electrical Machines
If starter is not used with large DC motor for starting, it will
draw a starting current many times its rated full load current.
provide execessive voltage drop in line.
all of above.
damage the armature and commutator.
draw a starting current many times its rated full load current.
provide execessive voltage drop in line.
all of above.
damage the armature and commutator.
Answer
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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by
varying the speed.
changing the load.
varying the applied voltage.
changing the field excitation.
varying the speed.
changing the load.
varying the applied voltage.
changing the field excitation.
Answer
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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)
T∝ P
T∝ P²
T is independent of P
T∝ P³
T∝ P
T∝ P²
T is independent of P
T∝ P³
Answer
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Electrical Machines
Which of the following motors are suitable for computer printer drive ?
Reluctance motor.
Stepper motor.
Shaded pole motor.
Hysteresis motor.
Reluctance motor.
Stepper motor.
Shaded pole motor.
Hysteresis motor.
Answer
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Electrical Machines
Example of double excited machine is
Both are correct.
None of these
Synchronous motor.
DC Shunt Motor
Both are correct.
None of these
Synchronous motor.
DC Shunt Motor
Answer
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