protective device Quiz Practice Quiz | Protective…

Q: Which of the following is a primary function of a protective device?

To isolate faulty circuits and protect equipment from damage. — Protective devices detect faults and prevent equipment damage.

Q: What is the most common type of low-voltage protective device?

Circuit Breaker — Circuit Breakers are commonly used to protect low-voltage circuits.

Q: What is the purpose of a fuse?

To interrupt the flow of current when it exceeds a certain value. — A fuse melts and breaks the circuit in case of overcurrent.

Q: Which type of protective device is typically used for overcurrent and short-circuit protection?

Relay — Relays are used with circuit breakers to detect faults.

Q: What does the term 'overcurrent' refer to?

A current flow that is higher than the rated value. — Overcurrent means current exceeding the safe limit.

Q: Which protective device uses a bimetallic strip for operation?

Thermal Overload Relay — Thermal overload relays use bimetallic strips for overload protection.

Q: What is the primary function of an Earth Leakage Circuit Breaker (ELCB)?

To protect against earth faults (leakage current). — ELCBs detect and interrupt leakage current to protect against electrocution.

Q: Which of these is NOT typically a protective device?

Contactor — Contactors switch power, but aren't primarily protective devices.

Q: What is the primary function of a ground fault circuit interrupter (GFCI)?

To protect against electric shock. — GFCIs detect ground faults and prevent electrical shock hazards.

Q: What is the purpose of the 'tripping' mechanism in a circuit breaker?

To automatically open the circuit in response to a fault. — The tripping mechanism opens the circuit when a fault is detected.

Question 1 of 10

Which of the following is a primary function of a protective device?

Protective devices detect faults and prevent equipment damage.

Question 2 of 10

What is the most common type of low-voltage protective device?

Circuit Breakers are commonly used to protect low-voltage circuits.

Question 3 of 10

What is the purpose of a fuse?

A fuse melts and breaks the circuit in case of overcurrent.

Question 4 of 10

Which type of protective device is typically used for overcurrent and short-circuit protection?

Relays are used with circuit breakers to detect faults.

Question 5 of 10

What does the term 'overcurrent' refer to?

Overcurrent means current exceeding the safe limit.

Question 6 of 10

Which protective device uses a bimetallic strip for operation?

Thermal overload relays use bimetallic strips for overload protection.

Question 7 of 10

What is the primary function of an Earth Leakage Circuit Breaker (ELCB)?

ELCBs detect and interrupt leakage current to protect against electrocution.

Question 8 of 10

Which of these is NOT typically a protective device?

Contactors switch power, but aren't primarily protective devices.

Question 9 of 10

What is the primary function of a ground fault circuit interrupter (GFCI)?

GFCIs detect ground faults and prevent electrical shock hazards.

Question 10 of 10

What is the purpose of the 'tripping' mechanism in a circuit breaker?

The tripping mechanism opens the circuit when a fault is detected.

protective device Quiz