18 Questions
What does the term 'Adjustable' indicate in the context of circuit breakers?
The circuit breaker can be set to trip at various values of current and/or time within a preterminal range.
Define 'Instantaneous Trip' in relation to circuit breakers.
No delay is purposely introduced in the tripping action of the circuit breaker.
What does 'Inverse Time' signify in the operation of a circuit breaker?
There is purposely introduced a delay in the tripping action of the circuit breaker, which decreases as the current magnitude increases.
Explain 'Non-adjustable' in the context of circuit breakers.
The circuit breaker does not have any adjustment to alter the tripping current value or time required for operation.
What is meant by 'Tripping' in the operation of a circuit breaker?
Cutting-off or disconnection of the supply current.
List five classifications of circuit breakers based on the text provided.
- Air blast Circuit Breaker, 2. Air Circuit Breaker (ACB) or Power Circuit Breaker, 3. Oil type Circuit Breaker, 4. Gas type Circuit Breaker
What are the different types of switches classified based on the type of operating mechanism?
Lever switch, Drum switch, Dial switch, Snap switch
How many locations can be achieved with 2-three way switches?
3 locations
What are Switchboards and Switchgear used for?
Switchboards and Switchgear provide switching and feeder protection to circuits connected to a main source.
What is the main difference between a switchboard and a panelboard?
Panelboards serve the same function as switchboards but on a smaller scale.
What is the typical function of a panelboard in a system?
The panelboard serves as the final distribution point, feeding out to branch circuits.
What are the two main components connected to the main fuses in a panelboard?
Protective devices like breakers and fuses
What are two advantages of a Circuit Breaker over a Fuse?
- It can be used again after the fault has been corrected. 2. Its position (open or close) can easily be detected or viewed.
How does the resistance of the human body affect the severity of an electric shock?
The resistance of the human body affects the severity of an electric shock; lower resistance leads to higher current flow and potentially more severe shocks.
What is the significance of the resistance of the human body in relation to electric shocks?
The resistance of the human body determines the amount of current that will pass through it during an electric shock.
How does a Circuit Breaker differ from a Fuse in terms of reusability?
A Circuit Breaker can be used again after a fault is corrected, while a Fuse needs to be replaced with a new one.
What is the purpose of Ground Fault Protection?
Ground Fault Protection aims to prevent severe electric shocks by detecting abnormal current paths to ground.
How does the design of a Circuit Breaker allow it to function as a switch?
A Circuit Breaker is designed to open and close electrical circuits as needed, allowing it to function as a switch in addition to its protective role.
Test your knowledge on circuit breaker operation and tripping mechanisms such as adjustable, instantaneous trip, and inverse time. Learn about the different qualifying terms associated with circuit breakers.
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