142 CBT Review

What is the purpose of a junction box?

• A) To contain wiring junctions or intersections
• B) To control the flow of electricity in a circuit
• C) To provide protection against environmental hazards
• D) All of the above

Junction boxes are used in which of the following applications?

• A) Domestic
• B) Commercial
• C) Industrial
• D) All of the above

Which of the following is NOT a basic check an electrical inspector must complete while inspecting junction boxes?

• A) Verify accessibility of all junction boxes
• B) Verify the junction box is not damaged or corroded
• C) Verify that cables are unsecured entering the junction box
• D) Check for enough length of conductors within the junction box

What is the function of built-in terminals in some junction boxes?

• A) To improve ventilation
• B) To prevent electric shock
• C) To provide additional security for wiring connections
• D) To reduce the risk of fire and explosion

What is one benefit of using junction boxes in domestic wiring?

• A) They enable future modifications to wiring systems to be made easier
• B) They are more cost-effective than other wiring methods
• C) They improve the aesthetic appearance of wiring
• D) They increase the efficiency of electrical systems

What is the purpose of Ingress Protection (IP) codes?

• A) To categorize and rate accessories for electrical safety
• B) To prevent dust and water ingress to accessories
• C) To ensure the safe connection of wiring
• D) To protect against mechanical impact resistance

Which rating system is used to categorize and rate accessories against personal access to hazardous parts?

• A) NEMA rating
• B) IP rating
• C) IEC standard
• D) IEEE standard

What is the purpose of sealing compounds in junction boxes?

• A) To prevent condensation
• B) To improve ventilation
• C) To protect against mechanical impact
• D) To reduce the risk of fire

Junction boxes are generally made from which of the following materials?

• A) Glass
• B) Soft plastic
• C) Metal
• D) Ceramic

What are the different types of junction boxes based on the environment in which they are installed?

• A) Industrial and commercial
• B) Hazardous and non-hazardous
• C) Indoor and outdoor
• D) Domestic and industrial