Module 3

Question 1

a tank for accumulating and storing a supply of hydraulic fluid at atmospheric pressure

Answer 1

Fluid reservoir

Question 2

a device in the reservoir tank that helps circulate returning fluid

Answer 2

Baffle

Question 3

a unit that stores hydraulic fluid under pressure until the system needs it

Answer 3

Accumulator

Question 4

Contaminants suspended in hydraulic fluid settle to the bottom of the reservoir to form _____.

Answer 4

Sludge

Question 5

The bottom of a reservoir should be sloped toward one end or have a low spot called the _____.

Answer 5

Sump

Question 6

In order to help circulate treurning fluid around the inside of the tank, a reservoir may contain a(n) _____.

Answer 6

Baffle

Question 7

Fluid lines carrying large amounts of air as they return to the reservoir should discharge onto a(n) _____.

Answer 7

Splash Plate

Question 8

Hydraulic fluid temperatures should be maintained at about _____ F.

Answer 8

100 to 120

Question 9

One of the easiest ways to cool the reservoir is to use _____.

Answer 9

Compressed Air

Question 10

In most liquid-cooled heat exchangers, the heat transfer occurs between two fluids that flow in the _____ direction.

Answer 10

Opposite

Question 11

If only a small amount of cooling is required, a(n) _____ tube can be installed in the return line.

Answer 11

Finned

Question 12

The function of an accumulator is to _____ hydraulic fluid for the system under pressure.

Answer 12

Store

Question 13

The fluid capacity of a weight-loaded accumulator generally is not much more than _____ gallon(s).

Answer 13

1

Question 14

The use of spring-loaded accumulators is limited to _____-pressure applications.

Answer 14

Low

Question 15

Nonseparated-gas accumulators are not recommended for use in high-pressure applications. Why?

Answer 15

Because the gas is absorbed by the fluid

Question 16

A bladder accumulator has a fluid capacity of approximately _____ gallon(s).

Answer 16

20

Question 17

Diaphragm accumulators should not be used for high-pressure applications because the diaphragm _____ during operation.

Answer 17

Flexes

Question 18

Gas-charged piston accumulators are not as effective as bladder accumulators in removing _____ from the system.

Answer 18

Pulsations

Question 19

A differential piston accumulator can also abe used as a pressure _____ or fluid _____.

Answer 19

Booster; Intensifier

Question 20

In order to separate contaminants from hydraulic fluid in the reservoir, the fluid must be

a. air-entrained
b. moved rapidly
c. moved slowly
d. swirled

Answer 20

c. moved slowly.

Question 21

The bottom of a hydraulic fluid reservoir should not be

a. equipped with a drain
b. flat
c. sloped
d. V-chaped

Answer 21

b. flat.

Question 22

A hydraulic reservoir relies on an interior baffle to

a. help heat transfer
b. reduce fluid surface area
c. strengthen the reservoir walls
d. support interior piping

Answer 22

a. help heat transfer.

Question 23

What method is not used to maintain the temperature of hydraulic fluid at an acceptable level?

a. Reducing pipe friction
b. Reducing pump work
c. Using a reservoir with large surface area
d. Using a reservoir with thick side walls

Answer 23

d. Using a reservoir with thick side walls.

Question 24

Most liquid-cooled heat exchangers transfer heat by means of

a. direct contact of the fluids
b. forced-air cooling
c. separated fluids moving in the opposite directions.
d. separated fluids moving in the same direction

Answer 24

d. separated fluids moving in the opposite directions.

Question 25

For what reason is an air breather installed on a reservoir?

a. Control air pressure
b. Control humidity
c. Maintain vacuum
d. Prevent pressure buildup

Answer 25

d. Prevent pressure buildup

Question 26

An accumulator is used in a hydraulic system for all of the following reasons except to

a. absorb hydraulic shocks
b. store pressurized fluid
c. supply fluid on demand
d. take the place of the pump

Answer 26

d. take the place of the pump.

Question 27

Because of their nonmechanical design, non separated-gas accumulators should not be used with

a. high-speed pumps
b. large volumes
c. low pressures
d. low volumes

Answer 27

a. High-speed pumps.

Question 28

Which of the following is the correct procedure to use when charging a bladder accumulator?

a. Preload nitrogen, drain fluid
b. Preload nitrogen, then fluid
c. Preload fluid, drain nitrogen
d. Preload fluid, then nitrogen

Answer 28

b. Preload nitrogen, then fluid.

Question 29

A distinctive characteristic of a differential piston accumulator is that it reduces

a. air pressure
b. fluid volume
c. the pressure ratio
d. vacuum

Answer 29

b. fluid volume.