unit 113 powerpoint 3

What is the purpose of the 'O' ring in press-fit fittings?

• To add weight

• To create a watertight seal

• To provide flexibility

• To reduce noise

Answer explanation

The 'O' ring in press-fit fittings serves to create a watertight seal, preventing leaks and ensuring the integrity of the connection. This is crucial for maintaining pressure and preventing fluid escape.

What is used to push press-fit fittings into position?

• A hammer

• A mechanical crimping tool

• By hand

• A screwdriver

Answer explanation

Press-fit fittings are designed to be installed by hand, allowing for a secure fit without the need for tools like hammers or crimping tools. This method ensures proper alignment and avoids damage to the fittings.

Which of the following is a characteristic of press-fit fittings?

• Requires welding

• Uses an 'O' ring

• Needs glue

• Is soldered

Answer explanation

Press-fit fittings utilize an 'O' ring to create a seal, making them easy to install without the need for welding, glue, or soldering. This characteristic distinguishes them from other types of fittings.

What is the primary material mentioned for the fittings?

• Plastic

• Copper

• Steel

• Aluminum

Answer explanation

The primary material mentioned for the fittings is copper, which is known for its excellent conductivity and durability, making it a preferred choice in plumbing and electrical applications.

What should be done if a socket depth gauge is unavailable?

• Use a ruler to measure and mark

• Skip the measurement

• Estimate the depth

• Use a different method

Answer explanation

If a socket depth gauge is unavailable, using a ruler to measure and mark is the best option. This method provides an accurate measurement, ensuring precision in your work, unlike estimating or skipping the measurement.

What safety precaution should be taken when using the press-fit tool?

• Wear gloves

• Keep fingers away from the jaws

• Use a wrench

• Apply lubricant

Answer explanation

The correct safety precaution is to keep fingers away from the jaws of the press-fit tool to prevent injury. This ensures that hands are not in the danger zone during operation.

What principle do capillary fittings use to draw solder into the fitting?

• Gravity

• Capillary action

• Magnetic force

• Electrical current

Answer explanation

Capillary fittings utilize capillary action, which is the ability of a liquid to flow in narrow spaces without external forces. This principle allows solder to be drawn into the fitting, ensuring a strong bond.

What is the purpose of using capillary action in jointing?

• To cool the joint

• To draw solder into the fitting

• To expand the pipe

• To create a magnetic field

Answer explanation

Capillary action helps draw solder into the fitting by creating a vacuum effect, ensuring a strong bond. This process is essential for effective jointing in plumbing and electrical applications.

Why is extra solder not needed in an integral solder ring fitting?

• Because it has a built-in rubber seal

• Because it has a band of lead-free solder inside

• Because it is made of plastic

• Because it uses a special adhesive

Answer explanation

Integral solder ring fittings contain a band of lead-free solder inside, which melts during installation, eliminating the need for extra solder. This design ensures a secure joint without additional materials.

What is the purpose of twisting the tube slightly when inserting it into the fitting?

• To make it fit tighter

• To ensure an even spread of flux

• To prevent leaks

• To align the tube correctly

Answer explanation

Twisting the tube slightly when inserting it helps to ensure an even spread of flux, which is crucial for creating a strong bond and preventing weak points that could lead to leaks.