2ND 17

Question 1

A hydraulic device which uses the impact or kinetic energy in the liquid to transmit power is called a _______ device.

a) hydrostatic
b) hydrodynamic
c) kinetic
d) pressure

Answer 1

b) hydrodynamic

Question 2

When a device is operated by pressure on a confined fluid, it is called a________ device, pressure being the force per unit area (lbs./sq. in. or PSI).

a) hydrostatic
b) hydrodynamic
c) kinetic
d) pressure

Answer 2

a) hydrostatic

Question 3

The tendency to cause flow (or the push) may be supplied by a mechanical pump or maybe caused simply by the_________ of fluid.

a) pressure
b) flow
c) weight
d) power

Answer 3

c) weight

Question 4

Pressure per square inch which is created by the height of the fluid is called_______ . This varies with the type of fluid being considered depending upon its weight per cubic foot (density).

a) pressure head
b) power
c) flow rate
d) effort

Answer 4

a) pressure head

Question 5

Atmospheric pressure=________ pounds per square inch absolute.

a) 1.47
b) 14.7
c) 4.47
d) 44.7

Answer 5

b) 14.7

Question 6

The pressure at the top of the barometer tube is___________ .

a) 0 PSI
b) 1 PSI
c) 30 PSI
d) 29 PSI

Answer 6

a) 0 PSI

Question 7

30 PSIG =_____ PSIA.

a) 1.47
b) 14.7
c) 4.47
d) 44.7

Answer 7

d) 44.7

Question 8

The flow of a fluid can be measured by either velocity (e.g. feet per second, or feet per minute) or by_______ , (volume per minute).

a) pressure head
b) weight
c) flow rate
d) force

Answer 8

c) flow rate

Question 9

5 GPM =______ cubic inches per minute.

a) 11155
b) 1155
c) .000583
d) .0583

Answer 9

b) 1155

Question 10

A difference in pressure at 2 different points in a horizontal hydraulic line indicates that there is________ .

a) flow
b) power
c) weight
d) pressure

Answer 10

a) flow

Question 11

Working pressure at the pump outlet is the sum of the_________ created by fluid friction within the piping and system components and the pressure needed to perform the work required.

a) force
b) power
c) pressure
d) rate

Answer 11

c) pressure

Question 12

When the particles of the fluid move parallel to each other and to the walls of the pipe, flow is said to be____ .

a) kinetic
b) turbulent
c) laminar
d) atmospheric

Answer 12

c) laminar

Question 13

Abrupt changes in flow direction or too high a velocity of the fluid may cause_____ flow.

a) laminar
b) turbulent
c) kinetic
d) inward

Answer 13

b) turbulent

Question 14

Two forms of energy within the hydraulic fluid are________ and potential.

a) laminar
b) turbulent
c) kinetic
d) static

Answer 14

c) kinetic

Question 15

If flow________ at various points in a hydraulic system remains constant, the sums of the pressure energy and kinetic energy are also constant (ignoring frictional loss).

a) power
b) pressure
c) heat
d) rate

Answer 15

d) rate

Question 16

Working lines carry main system flow from the pump inlet through the system and also return flow to reservoir. _________ lines carry fluid for control and operation of other valves or components. Drain lines return leakage oil to reservoir.

a) pilot
b) port
c) drain
d) pressure

Answer 16

a) pilot

Question 17

A circle with an energy triangle at the circumference pointing outward for a pump or_______ in the case of a motor is called a graphical symbol.

a) laminar
b) outward
c) inward
d) upward

Answer 17

c) inward

Question 18

How many envelopes are in the symbol for a relief valve?

a) one
b) two
c) three
d) none

Answer 18

a) one

Question 19

Connecting lines drawn to the bottom of the reservoir symbol represent lines that terminate______ fluid level.

a) above
b) below
c) within
d) flow

Answer 19

b) below

Question 20

How many positions does the directional valve in Fig. have?

a) one
b) two
c) three
d) none

Answer 20

b) two