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Questions and Answers
In a transformer, the two windings are:
In a transformer, the two windings are:
What happens to a salient pole synchronous motor running at no load when its field current is switched off?
What happens to a salient pole synchronous motor running at no load when its field current is switched off?
Why should a DC series motor always be started with load?
Why should a DC series motor always be started with load?
What can be said about the angular displacement in a stepper motor?
What can be said about the angular displacement in a stepper motor?
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When is the power factor of a squirrel cage induction motor low?
When is the power factor of a squirrel cage induction motor low?
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Study Notes
Transformer Windings
- A transformer consists of two primary windings: the primary winding and the secondary winding, which facilitate voltage conversion.
Salient Pole Synchronous Motor
- If the field current in a salient pole synchronous motor is turned off while it runs at no load, the motor will behave like an induction motor and may lose synchronism, leading to stalling.
DC Series Motor
- A DC series motor must always be started with a load to prevent high starting current that can cause damage; without load, the motor can accelerate rapidly and potentially overspeed.
Stepper Motor Angular Displacement
- In a stepper motor, angular displacement is quantized, meaning it moves in discrete steps; each pulse to the motor corresponds to a specific angular movement.
Squirrel Cage Induction Motor Power Factor
- The power factor of a squirrel cage induction motor is typically low at low loads and approaches unity as the load increases; low power factor occurs due to the reactance dominating at reduced load conditions.
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Description
Test your knowledge of electrical engineering with these objective questions about transformer windings and synchronous motor behavior. Choose the correct answer from the options provided.
