Electrical Power Supply and Protection MCQ’s

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This set of Mechatronics Multiple Choice Questions & Answers (MCQs) focuses on “Electrical Power Supply and Protection”.

1. SF6 circuit breakers are better than BOCB (Bulk oil circuit breaker).
a) True
b) False

2. Which is not a property of Sulphur hexafluoride?
a) Colourless
b) Odourless
c) Toxic
d) Non-Inflammable

3. What is the medium in which arc is kept in SF6 circuit breaker?
a) Oil
b) Air
c) Sand
d) Sulphur hexafluoride

4. What is the dielectric strength of Sulphur hexafluoride used in SF6 type circuit breaker?
a) 2.5 times of air
b) 2.5 times of water
c) 2.5 times of oil
d) 2.5 times of glass

5. What does “MCB” stand for?
a) Miniature circuit breaker
b) Mini circuit breaker
c) Miniature capacitor breaker
d) Mini Capacitance breaker

6. What is the medium in which arc is kept in BOCB (Bulk oil circuit breaker)?
a) Oil
b) Air
c) Sand
d) Water

7. Potential difference and EMF (Electro-motive force) are same.
a) True
b) False

8. What is the principal on which MCB (Miniature circuit breaker) works ?
a) Magnetic effect of electric current
b) Lenz law
c) Faradays law of electric current
d) Flemings Right hand rule

9. Which material is commonly used for making the arch of circuit breakers?
a) Copper
b) Tungsten
c) Aluminium
d) Copper tungsten alloy

10. What is the standard colour of ac supply ground wire in India?
a) Red
b) Magenta
c) Pink
d) Green

11. What is the standard colour of ac supply neutral wire in India?
a) Red
b) Black
c) Pink
d) Green

12. What does “BOCB” stand for in context to circuit protections?
a) Bulk on-spot circuit breakers
b) Bonded oil circuit breaker
c) Bulk oiled circuit breaker
d) Bulk oil circuit breaker

13. What is the standard colour of ac supply live wire in India?
a) Red
b) Magenta
c) Pink
d) Green

14. Green and yellow striped wire is also used to indicate ac (alternating current) supply live wire.
a) True
b) False

15. Live wire and hot wire are same.
a) True
b) False

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