17 - Eat 2

Question 1

A hydraulic device which uses the impact or kinetic energy in a liquid to transmit power is called a _______ device. A) Hydrostatic B) Hydrodynamic C) Kinetic
D) Pressure

Answer 1

B) Hydrodynamic pg 28

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 pg28

Question 3

The tendency to cause flow (or to 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 pg28

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 pg 29

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 (Atmospheric pressure is 14.7 psi) pg 30

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 pg 30 & 32

Question 7

30 PSIG = ______ PSIA. A) 1.47 B) 14.7 C) 4.47 D) 44.7

Answer 7

D) 44.7 30 + 14.7 = 44.7
PSIA = Gauge + Atmosphere
PSIG = Gauge Pressure
Atmosphere = 14.7 pg 32

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 pg 33

Question 9

5 GPM = ________ cubic inches per minute. A) 11155 B) 1155 C) .000583 D) .0583

Answer 9

B) 1155
5 x 231 = 1,155 cu. in./min
(1 GPM = 231 cu. in./min) pg 33

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 pg 34

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 pg 35

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 pg 36

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 pg 36

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 pg 37

Question 15

If flow _____ at various points in a hydraulic system remains constant, the sum 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 pg 37

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 Pilot or Sensing lines carry fluid that is used to control the opertation of a valve or other component pg 40

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 pg 40

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 pg 42

Question 19

Connecting lines drawn to the bottom of the reservoir symbol represent lines that terminate ______ fluid level.
A) B) Below C) D)

Answer 19

B) Below pg 43

Question 20

How many positions does the directional valve in Fig. have?
A) One B) Two C) Three D) None

Answer 20

C) Three (The number of boxes indicates the number of positions.) pg 43