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- 1. Multiple Choice
Which part of the circuit breaker is helpful in breaking the current?
Trip coil.
Contacts.
Medium
Handle.
- 2. Multiple Choice
Which type of tripping is generally preferred for the circuit breaker?
Manual
Automatically
Depending on the voltage level
None of the above
- 3. Multiple Choice
The arc resistance depends on which among the following factors?
Cross section of the arc.
Length of the arc.
Degree of ionisation
All of the above
- 4. Multiple Choice
Arcing voltage will be the least in case of
Carbon
Copper
Silver
Tungsten
- 5. Multiple Choice
What happens in the arc extinction using high resistance method?
Arc resistance is decreased with time.
Arc resistance is increased with time.
No change it remains same.
Arc resistance is kept zero.
- 6. Multiple Choice
When using low resistance method for arc extension what is the value of arc resistance?
Arc resistance is zero.
Arc resistance is high
Arc resistance is low
Arc resistance is very high
- 7. Multiple Choice
The resistance of an electric arc can be increased by
Increasing the concentration of ionised particles.
Reducing the arc length.
Splitting the arc.
Increasing the arc cross section.
- 8. Multiple Choice
The heat produced at the contact point owing to flow of electric current is least affected by_____
Temperature of the surrounding medium.
Contact resistance.
Magnitude of electric current flowing.
Duration of flow of current.
- 9. Multiple Choice
In a circuit breaker, ionisation is facilitated by______
Increase in field strength.
Increase in mean free length.
High temperature of the surrounding medium.
All of the above.
- 10. Multiple Choice
In a circuit breaker the contact space is ionised by what?
Field emission from the contact surface.
Thermal emission from the contact surface.
Thermal ionisation of gas.
All of above.
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