2ND 19

Question 1

Pipe sizes are specified by ______ size and will thickness.

a) index
b) negative
c) nominal
d) positive

Answer 1

c) nominal

Question 2

The schedule number for standard pipe is?

a) 100
b) 50
c) 40
d) 30

Answer 2

c) 40

Question 3

One advantage of tubing over pipe is the ease of _______ to shape.

a) elastomer
b) bending
c) de-greasing
d) cutting

Answer 3

b) bending

Question 4

The specified sizes for tubing refer to the________ .

a) I. D. (inside diameter)
b) O.D. (outside diameter)
c) sub-plate
d) fittings

Answer 4

b) O.D. (outside diameter)

Question 5

Sealing between sections of tubing is obtained by the use of various types of _________ .

a) valves
b) elastomer
c) fittings
d) fluids

Answer 5

c) fittings

Question 6

The four primary purposes of hydraulic fluid are ________.

a) Transmission of Power
b) cooling
c) lubricate and seal
d) all of the above

Answer 6

d) all of the above

Question 7

Lip type seals are used principally on _______ shafts.

a) permanent
b) rotating
c) pressure
d) rigid

Answer 7

b) rotating

Question 8

An elastic or rubber-like material that contains no natural rubber is called an_________.

a) additive
b) elastomer
c) emulsifier
d) illuminator

Answer 8

b) elastomer

Question 9

Nitrile (Buna-N) has a reasonably wide temperature range, which is_________ °F.

a) 100° to 500°F
b) 60° to 500°F
c) 40° to 250°F
d) 100° to 250°F

Answer 9

c) 40° to 250°F

Question 10

One of the several ways to reduce leakage is with the use of _________ mounted valves.

a) surface
b) back
c) sub-plate
d) front

Answer 10

b) back

Question 11

Back mounting refers to panel type installations where pipe or tubing is _______ connected to sub-plates.

a) temporarily
b) permanently
c) alternately
d) sometimes

Answer 11

b) permanently

Question 12

What type of seal is installed in an annular groove?

a) dynamic
b) t-ting
c) o-ring
d) cup

Answer 12

c) o-ring

Question 13

After installation a seal began to wear quickly and leak, which meant it was probably not _________ before installation.

a) measured
b) lubricated
c) cleaned
d) back-mounted

Answer 13

b) lubricated

Question 14

At too high a temperature a seal may harden, swell or________ .

a) blow
b) vibrate
c) sandwich
d) soften

Answer 14

d) soften

Question 15

What type of inexpensive sealing material is widely used in modern hydraulic systems?

a) nitrile
b) silicone
c) Teflon
d) viton

Answer 15

a) nitrile