TECHNOLOGY AND LIVELIHOOD EDUCATION Summative Test

A student needs to install a box for a flush-type switch in a classroom. What box should be used?

• Junction box

• Panel box

• Square box

• Utility box

Answer explanation

A utility box is specifically designed for flush-type switches, providing the necessary space and support for installation. Other options like junction or panel boxes are not suitable for this purpose.

How many holes does a 3 x 3 panel box have?

• 2

• 4

• 6

• 9

Answer explanation

A 3 x 3 panel box has 3 rows and 3 columns, totaling 9 sections. However, each section typically has 2 holes (one for input and one for output), resulting in 6 holes in total.

Which box should be used to connect and protect splices where three conduits meet?

• Junction box

• NEMA 3R box

• Panel box

• Utility box

Answer explanation

A junction box is specifically designed to connect and protect electrical splices, making it the correct choice for situations where three conduits meet. Other options do not serve this purpose.

A panel box was installed in a damp area without proper protection. What is the greatest danger?

• Square boxes may loosen

• Circuit breakers may overheat

• Junction boxes may corrode faster

• Moisture may cause electrical short circuits

Answer explanation

The greatest danger in a damp area is that moisture can lead to electrical short circuits, which pose significant safety risks, including fire hazards and equipment damage.

The inspector rejected your work connecting four conduits with multiple wires. What type of box should have been used instead?

• Junction box

• NEMA 3R box

• Panel box

• Square box

Answer explanation

A square box is designed to accommodate multiple conduits and wires, making it suitable for your work. Other options like junction or panel boxes are not specifically intended for this purpose.

An inspector asked a student to explain why conduits are needed in electrical installations. What is their purpose?

• To cover light bulbs

• To decorate the walls

• To protect and route electric wires

• To connect appliances directly to power

Answer explanation

Conduits are essential in electrical installations as they protect and route electric wires, ensuring safety and organization. They prevent damage to wires and reduce the risk of electrical hazards.

Which conduit is lightweight and resistant to moisture and corrosion?

• EMT

• FMC

• PVC

• RMC

Answer explanation

PVC (Polyvinyl Chloride) is lightweight and offers excellent resistance to moisture and corrosion, making it ideal for various applications. In contrast, EMT (Electrical Metallic Tubing), FMC (Flexible Metal Conduit), and RMC (Rigid Metal Conduit) do not provide the same level of moisture resistance.

A student is wiring a service entrance where sparks and mechanical impact are expected. Which conduit offers the best mechanical protection?

• EMT

• FMC

• PVC

• RMC

Answer explanation

RMC (Rigid Metal Conduit) provides the best mechanical protection for wiring in environments with expected sparks and mechanical impact due to its robust construction, making it ideal for service entrances.

What is the defect called when a student creates a sharp dent while bending a rigid steel conduit (RSC)?

• Burr

• Break

• Crack

• Kink

Answer explanation

A 'kink' is a sharp bend or dent in a conduit, caused by improper bending techniques. Unlike a burr, break, or crack, a kink specifically refers to this type of deformation in rigid steel conduit.

After cutting a PVC conduit, a student found sharp edges. What should be done before inserting the wires?

• Wrap the edges with tape

• Ream the conduit to remove burrs

• Ignore it since wires can pass easily

• Add more conduit to cover the burrs

Answer explanation

Reaming the conduit removes sharp burrs that can damage wires during insertion. This step ensures safety and prevents potential electrical hazards, making it the best choice before proceeding.