E - Materials and Fastening Devices

Question 1

Ferrous metals are metals that:

Answer 1

Have an iron base.

Question 2

True or False: Threads for cast iron are usually a course thread.

Answer 2

True

Question 3

Which of the following has the lowest melting point? Aluminum, brass, copper, or lead.

Answer 3

Lead

Question 4

What is elasticity?

Answer 4

Elasticity is the ability of a material to be stretched and still return to its original shape.

Question 5

When steel is heated to a high temperature and cooled slowly, the metal will be:

Answer 5

In a softened state, easy to work.

Question 6

Vulcanizing rubber refers to:

Answer 6

Heating raw rubber with sulphur to alter its properties.

Question 7

What is the health hazard when working with asbestos and fibreglass?

Answer 7

Both are hazardous when inhaled.

Question 8

Which of the items listed below would be best to form a gasket? Gasket sealant, fibreglass, thread locker, or silicone.

Answer 8

Silicone.

Question 9

True or False: Nylons are being used in industry as a replacement for metal.

Answer 9

True.

Question 10

A cap screw with a thread pitch of 1/24 in ch has:

Answer 10

24 threads per inch.

Question 11

Thread series refers to the:

Answer 11

Type of thread: UNC, UNF, UNEF or NPT.

Question 12

Explain by short answer or sentence form, how tensile strength is indicated on imperial and metric fasteners.

Answer 12

Imperial fasteners have lines. The number of lines plus two is the tensile strength. Metric fasteners have numbers indicating their class: 4.8, 8.8, 10.9.

Question 13

What do the numbers 10-24 refer to in regards to machine screws?

Answer 13

10 indicates the diameter or size; 24 indicates the number of threads per inch.

Question 14

Lock washers are Not suitable for use with which of the following?

Answer 14

Aluminum.

Question 15

A fastener with six radial marks on the head has a tensile strength of:

Answer 15

Eight.

Question 16

A fastener has resistance going into a threaded hole. This resistance to turning is called:

Answer 16

Run down torque and must be added on to the full torque.

Question 17

What is another name for a Woodruff key?

Answer 17

A half moon key.

Question 18

Besides securing and driving components, what other function is performed by a helical spline? Explain in one sentence.

Answer 18

A helical spline offsets end or axial thrust.

Question 19

Applying a lubricant to the threads of a fastener and using a dry torque specification will:

Answer 19

Increase the clamp load compared to dry threads.

Question 20

Split and roll pins should be installed with what kind of tool? Explain in one sentence.

Answer 20

Use a roll pin punch for the size of pin.

Question 21

Set screws use the same sizing standards as:

Answer 21

Machine screws.

Question 22

True or False: Aerobic sealers are those that require air to enable them to cure.

Answer 22

True.

Question 23

Explain the function of a snap ring.

Answer 23

Snap rings are placed within a groove on a shaft or housing and provide a surface against which a component may ride.

Question 24

If a fastener with thread locker or locktite is difficult to remove, you should:

Answer 24

Apply heat.