Mechanical Power Transmission 1

What is the function of a seal?

• To prevent leakage of fluids

• To reduce friction

• To reduce waste of energy

• To prevent lubricants from entering the environment and dirty water from entering the installation

What are the two categories of seal?

• Static seal and bushing

• Static seal and radial seal

• Static seal and dynamic seal

• Dynamic seal and Mechanical Face seal

Which of the following is true for static seal?

• Sealing takes place between two surfaces that move relative to each other

• Sealing takes place between two surfaces that do not move relative to each other

• Control leaks of gas or liquid where there is movement between components

Which of the following is true for dynamic seal?

• Sealing takes place between two surfaces that do not move relative to each other

• Sealing takes place between two surfaces that move relative to each other

• Providing a complete physical barrier to leakage flow

Which of the following are examples of static seal?

• Face seals, Radial Lip seals, Labyrinth Seals, Bush

• Packings

  Piston Rings

• Gasket, Elastomeric Seals

• Cams and followers

Which of the following are examples of dynamic seals?

• Gaskets, Elastomeric Seals (O-Rings)

• Face seals, Radial Lip seals, Labyrinth Seals, Bush

• Packings

  Piston Rings

• Cams and followers

Why dp labyrinth seals composed of many grooves?

• So that the fluid has to pass through a long and difficult path to escape

• TO reduce wear on the grooves

• To wipe excess lubricant

• To form a sealing surface

What type of cam does the picture show?

• Cylindrical cam

• Linear cam

• Radial cam

• Rectangular cam

What type of cam does the picture show?

• Cylindrical cam

• Linear cam

• Radial cam

• Rectangular cam

The pictures show different types of followers. Identify a, b, c and d.

• a. Roller follower

  b. Flat-face follower

  c. Spherical follower

  d. Knife-edge follower

• a. Knife-edge follower

  b. Roller follower

  c. Flat-face follower

  d. Spherical follower

• a. Flat-face follower

  b. Roller follower

  c. Spherical follower

  d. Knife-edge follower

• a. Spherical follower

  b. Roller follower

  c. Flat-face follower

  d. Knife-edge follower