Question 1 of 20
What is the primary function of a circuit breaker?
The primary function of a circuit breaker is to protect a circuit from overcurrents and short circuits.
Question 2 of 20
What does 'MCB' stand for?
MCB stands for Miniature Circuit Breaker.
Question 3 of 20
What type of fault can cause a circuit breaker to trip?
Circuit breakers trip due to overloading, short circuits, or voltage spikes, all of which cause excessive current flow.
Question 4 of 20
Which of the following is NOT a method used for arc extinction?
Increasing the voltage does not help extinguish the arc; cooling, vacuum, and oil are used to interrupt the arc.
Question 5 of 20
What is the purpose of the 'tripping curve' in a circuit breaker?
The tripping curve defines how a circuit breaker reacts to varying levels of fault current over time.
Question 6 of 20
Which gas is commonly used as an arc-quenching medium in high-voltage circuit breakers?
SF6 is a highly effective dielectric gas used in high-voltage circuit breakers to extinguish arcs quickly.
Question 7 of 20
What is a 'short circuit'?
A short circuit is a low-resistance path, causing excessive current flow.
Question 8 of 20
What is an 'arc' in the context of a circuit breaker?
An arc is a luminous discharge caused by the flow of electricity through an ionized gas.
Question 9 of 20
What does 'ELCB' stand for?
ELCB stands for Earth Leakage Circuit Breaker.
Question 10 of 20
What is the main advantage of using a vacuum circuit breaker?
Vacuum circuit breakers have many advantages including fast arc extinction, high voltage capability and compact size.
Question 11 of 20
What is the function of an arc flash?
An arc flash is a dangerous event that can occur during a fault.
Question 12 of 20
What is the purpose of cooling the arc in arc extinction?
Cooling the arc recombines the ionized particles, increasing the dielectric strength and aiding arc extinction.
Question 13 of 20
What type of circuit breaker is commonly used for residential applications?
MCBs (Miniature Circuit Breakers) are widely used in residential applications.
Question 14 of 20
What does 'RCCB' stand for?
RCCB stands for Residual Current Circuit Breaker.
Question 15 of 20
Which of the following describes the behavior of a Type B circuit breaker?
Type B circuit breakers trip at a range of 3-5 times the rated current.
Question 16 of 20
What is the main difference between an ELCB and an RCCB?
ELCBs detect voltage while RCCBs detect a current imbalance.
Question 17 of 20
What is the purpose of a 'ganged' circuit breaker?
Ganged circuit breakers have multiple poles that operate simultaneously.
Question 18 of 20
Which type of circuit breaker is suitable for low-voltage applications?
MCBs (Miniature Circuit Breakers) are commonly used in low-voltage applications.
Question 19 of 20
What is the role of stored mechanical energy in a circuit breaker?
Stored mechanical energy (springs, compressed air) provides the force to quickly open the contacts.
Question 20 of 20
What type of protection does an AFCI provide?
AFCI (Arc Fault Circuit Interrupter) provides protection against arc faults.
1 / 20
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