Virtual Labs

Electrical Engineering Virtual Power Lab Experiments

Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Synchronization of an Alternator with an Infinite Bus Bar

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1. When alternator is supplying resistive load

a: the armature reaction flux will be almost zero Explanation

Explanation

b: the armature reaction flux will be along the axis of the field Explanation

Explanation

c: the armature reaction flux will be at 90 deg. with the field axis Explanation

Explanation

d: the armature reaction flux will be at 180 deg. with the field axis Explanation

Explanation

2. How many electrical degrees in one rotation for a 12 pole alternator -

a: 60 deg. Explanation

Explanation

b: 360 deg. Explanation

Explanation

c: 1080 deg. Explanation

Explanation

d: 2160 deg. Explanation

Explanation

3.Three phase alternator are usually star connected

a: to save copper Explanation

Explanation

b: to reduce conductor size Explanation

Explanation

c: to obtain higher terminal voltage Explanation

Explanation

d: to reduce windage losses Explanation

Explanation

4. Short circuit ratio of a turbo alternator is usually

a: 0.5 Explanation

Explanation

b: 0.5 to 0.7 Explanation

Explanation

c: 0.1 to 1.7 Explanation

Explanation

d: 2 to 3 Explanation

Explanation

5. Under which condition hunting of synchronous motor is likely to occur

a: periodic variation of load Explanation

Explanation

b: over-excitation Explanation

Explanation

c: overload for long time Explanation

Explanation

d: small and constant load Explanation

Explanation

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