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Electrical Engineering Virtual Power Lab Experiments

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Theory

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Procedure

Simulation

Posttest

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Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Study of Induction Motor Protection Using a Numerical Relay

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Beginner

Intermediate

Advanced

1. What is the purpose of back up protection?

a: To increase the speed Explanation

Explanation

b: To increase the reach Explanation

Explanation

c: To leave no blind spot Explanation

Explanation

d: To guard against failure of primary Explanation

Explanation

2. What is the actuating quantity for the relays?

a: Magnitude Explanation

Explanation

b: Frequency Explanation

Explanation

c: Phase angle Explanation

Explanation

d: All of these Explanation

Explanation

3. The Induction Motor failures are mainly due to:

a: Electrical faults Explanation

Explanation

b: Mechanical stresses Explanation

Explanation

c: Environmental conditions Explanation

Explanation

d: All of these Explanation

Explanation

4. What are the protections in starter of 3-phase induction motor:

a: Limiting starting current Explanation

Explanation

b: Overload protection Explanation

Explanation

c: No-voltage protection Explanation

Explanation

d: All above Explanation

Explanation

5. Name the protection used for induction motor from overload, single phasing, locked rotor and earth fault:

a: fuses Explanation

Explanation

b: numerical protection Explanation

Explanation

c: Protection in starter Explanation

Explanation

d: None of these Explanation

Explanation

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