Virtual Labs

Electrical Engineering Virtual Power Lab Experiments

Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Study of Over-Current Relay and Effect of PSM and TSM

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Beginner

Intermediate

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1. The standard voltage ratings of an electromagnetic relay are-

a: 110 V, 63.5 V (L-N) Explanation

Explanation

b: 220 V, 110 V Explanation

Explanation

c: 230 V, 154 V Explanation

Explanation

d: 400 V, 231 V Explanation

Explanation

2. The main function of relay is-

a: Fault isolation Explanation

Explanation

b: Fault detection Explanation

Explanation

c: Fault protection Explanation

Explanation

d: All of the above Explanation

Explanation

3. The relay operating coil is energized by-

a: Steam engine Explanation

Explanation

b: Power transformer Explanation

Explanation

c: Instrument transformer Explanation

Explanation

d: None of the above Explanation

Explanation

4. Which one is correct-

a: 1 VA relay is more sensitive than 5 VA relay Explanation

Explanation

b: 1 VA relay is less sensitive than 5 VA relay Explanation

Explanation

c: 1 VA relay is equally sensitive than 5 VA relay Explanation

Explanation

d: None of the above Explanation

Explanation

5. An over current relay having a current setting of 125% is connected to CT of 400/5. The pick up value is-

a: 6.25 A Explanation

Explanation

b: 10 A Explanation

Explanation

c: 12.5 A Explanation

Explanation

d: 15 A Explanation

Explanation

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