17 - Eat 2 Flashcards
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
B) Hydrodynamic pg 28
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
A) Hydrostatic pg28
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
C) Weight pg28
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
A) Pressure Head pg 29
Atmospheric pressure = ______ pounds per square inch absolute.
A) 1.47 B) 14.7 C) 4.47 D) 44.7
B) 14.7 (Atmospheric pressure is 14.7 psi) pg 30
The pressure at the top of the barometer tube is? A) 0 PSI B) 1 PSI C) 30 PSI D) 29 PSI
A) 0 PSI pg 30 & 32
30 PSIG = ______ PSIA. A) 1.47 B) 14.7 C) 4.47 D) 44.7
D) 44.7 30 + 14.7 = 44.7
PSIA = Gauge + Atmosphere
PSIG = Gauge Pressure
Atmosphere = 14.7 pg 32
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
C) Flow Rate pg 33
5 GPM = ________ cubic inches per minute. A) 11155 B) 1155 C) .000583 D) .0583
B) 1155
5 x 231 = 1,155 cu. in./min
(1 GPM = 231 cu. in./min) pg 33
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
A) Flow pg 34
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
C) Pressure pg 35
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
C) Laminar pg 36
Abrupt changes in flow direction or too high a velocity of the fluid may cause _____ flow. A) Laminar B) Turbulent C) Kinetic D) Inward
B) Turbulent pg 36
Two forms of energy within the hydraulic fluid are _____ and potential.
A) Laminar B) Turbulent C) Kinetic D) Static
C) Kinetic pg 37
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
D) Rate pg 37
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
A) Pilot Pilot or Sensing lines carry fluid that is used to control the opertation of a valve or other component pg 40
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
C) Inward pg 40
How many envelopes are in the symbol for a relief valve?
A) One B) Two C) Three D) None
A) One pg 42
Connecting lines drawn to the bottom of the reservoir symbol represent lines that terminate ______ fluid level.
A) B) Below C) D)
B) Below pg 43
How many positions does the directional valve in Fig. have?
A) One B) Two C) Three D) None
C) Three (The number of boxes indicates the number of positions.) pg 43
