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A hydraulic pump that uses meshed gears that rotate and move what?
Answer
Correct Answer:
Liquid through a hydraulic system
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A hydraulic pump that uses meshed gears that rotate and move liquid through a hydraulic system is called what?
Answer
Correct Answer:
GEAR PUMP
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What is the name of the component that transmits power to another component when rotated?
Answer
Correct Answer:
GEAR
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What is the abbreviation for gauge pressure?
Answer
Correct Answer:
Psig
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What is the term used to state that any pressure stated is corrected for atmospheric pressure?
Answer
Correct Answer:
GAUGE PRESSURE
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What is a device used for measuring, indicating or comparing?
Answer
Correct Answer:
GAUGE
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What is a GATE VALVE?
Answer
Correct Answer:
A two-way hydraulic valve
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What type of hydraulic component stores hydraulic fluid?
Answer
Correct Answer:
GAS-LOADED ACCUMULATOR
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What type of lubrication is necessary to separate two surfaces?
Answer
Correct Answer:
FULL-FLUID-FILM LUBRICATION
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What is present in FULL-FLUID-FILM LUBRICATION?
Answer
Correct Answer:
A continuous lubricating film
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Full flow is a type of what?
Answer
Correct Answer:
Filter
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A filter in which all the fluid must pass through the filter element is called what?
Answer
Correct Answer:
FULL FLOW
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What type of exposed surface is used for piping connections?
Answer
Correct Answer:
Normally
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What are piping connections on if they are on normally exposed surfaces of hydraulic components?
Answer
Correct Answer:
FRONT CONNECTED
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What is the unit of time called that a given action occurs in?
Answer
Correct Answer:
FREQUENCY
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What is the secondary spool called?
Answer
Correct Answer:
Larger spool
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What type of valve features a solenoid to control the operating spool?
Answer
Correct Answer:
FOUR-WAY VALVE, SOLENOID & DIRECT OPERATED
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How many ways can a valve be activated?
Answer
Correct Answer:
Four
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How is a proportional valve actuated?
Answer
Correct Answer:
By a solenoid
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Movement of the spool from the one extreme end to the other extreme end what?
Answer
Correct Answer:
Reverses the flow paths of the ports
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What can be used to activate these valves?
Answer
Correct Answer:
MANUALLY
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How many ports are in a four-way spool valve?
Answer
Correct Answer:
Five
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What is a spool valve that allows the reversal of hydraulic flow?
Answer
Correct Answer:
A four-way spool valve
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What term is used when a valve has four ports?
Answer
Correct Answer:
FOUR-WAY
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What is an example of a system that has an exponential increase in available power?
Answer
Correct Answer:
Power transmission systems
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What is the term for the exponential increase in available power usually associated with tools and power transmission systems?
Answer
Correct Answer:
Force Multiplication
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What does the term "force" mean in a fluid power system?
Answer
Correct Answer:
The measure of the result of pressurized fluid acting upon a chamber
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What is the most common unit used to state the force in pounds that will be available at the rod of a cylinder when acted upon by pressurized fluid from a fluid power system?
Answer
Correct Answer:
Pounds per square inch
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What is the correct term for a fluid moving in layers?
Answer
Correct Answer:
Laminar
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What is a flow situation in which fluid moves in parallel laminar layers?
Answer
Correct Answer:
FLOW, LAMINAR
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What does hydraulic oil used in hazardous applications have to be resistant to?
Answer
Correct Answer:
FIRE-RESISTANT
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Type of oil used for high temperature or hazardous applications?
Answer
Correct Answer:
Hydraulic oil
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What is the unit of Fluid Velocity?
Answer
Correct Answer:
Length divided by time
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What property of a fluid is not permanently changed?
Answer
Correct Answer:
FLUID STABILITY
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What does fluid stability prevent from happening?
Answer
Correct Answer:
Permanent changes in properties
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What type of pressure is used?
Answer
Correct Answer:
Fluid
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What is a system of components that use a pressurized fluid to transfer energy?
Answer
Correct Answer:
FLUID POWER SYSTEM
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Fluid power is used to transmit and control the flow of what?
Answer
Correct Answer:
Energy
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What could be used to transmit energy through a pressurized fluid?
Answer
Correct Answer:
FLUID POWER
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What kind of motor transforms the flow of pressurized fluid into rotary motion?
Answer
Correct Answer:
FLUID MOTOR
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A fluid motor is a device that transforms the flow of fluid into what?
Answer
Correct Answer:
Rotary motion
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What is resistance to flow from fluids measured in?
Answer
Correct Answer:
Psi
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What causes fluid friction in a system?
Answer
Correct Answer:
Viscosity
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What type of device indicates the volume of fluid passing through its interior passage?
Answer
Correct Answer:
FLOWMETER
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What is a turbulent flow?
Answer
Correct Answer:
A flow situation in which fluid particles move in a random matter
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In a turbulent flow, the particles move in what kind of a matter?
Answer
Correct Answer:
Random
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What digital device opens or closes a contact when a pre-set flow passes over the sensing element?
Answer
Correct Answer:
FLOW SWITCH
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What is the measurement in gallons per minute used to measure flow rate?
Answer
Correct Answer:
Gpm
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What are used to divide the fluid in a passage?
Answer
Correct Answer:
FLOW DIVIDER
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What is a FLOW DIVIDER used for?
Answer
Correct Answer:
To divide the fluid in a passage
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What is a flow divider used to divide a fluid into?
Answer
Correct Answer:
Two or more separate fluid streams
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What does flow demand measure?
Answer
Correct Answer:
The amount of fluid movement in a hydraulic system
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What is the term for the amount of fluid movement in a hydraulic system that is required to perform a specific job or type of work?
Answer
Correct Answer:
Flow Demand
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What are flow control valves used to regulate?
Answer
Correct Answer:
The flow of hydraulic fluid
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What are FLOW CONTROL VALVEs used for?
Answer
Correct Answer:
Regulate the flow of hydraulic fluid
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A check valve is placed in close proximity in a common body. This valve is called?
Answer
Correct Answer:
FLOW CONTROL VALVE
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What does "lock-up" mean?
Answer
Correct Answer:
Check-off
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What type of valve connects all ports to the tank?
Answer
Correct Answer:
Spool valve
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What type of valve connects all of the ports to the tank port?
Answer
Correct Answer:
FLOAT SPOOL
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What does a fitting close or connect to?
Answer
Correct Answer:
Fluid power lines and passages
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What are connectors or closures for fluid power lines and passages?
Answer
Correct Answer:
FITTING
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What is a FILLER CAP normally equipped with?
Answer
Correct Answer:
A fine screen
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What device provides an access for filling?
Answer
Correct Answer:
FILLER CAP
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Any closed circuit consisting of one or more forward elements and one or more feedback elements is called an what?
Answer
Correct Answer:
FEEDBACK LOOP
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What does a closed loop system do to monitor feedback?
Answer
Correct Answer:
Part of a closed loop system which monitors back information
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What can happen to a material when it suffers from fatigue?
Answer
Correct Answer:
Failure
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What is the commonly used term for exhaust line?
Answer
Correct Answer:
A passage or channel that is open to the atmosphere
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What are exhaust lines normally used in systems that may be dispensed into the atmosphere?
Answer
Correct Answer:
Systems using pressurized air or gases
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A passage or channel that is open to the atmosphere is called what?
Answer
Correct Answer:
EXHAUST LINE
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What is the degradation of a surface resulting from a mixture of fluid and air or fluid and dirt particles occurring?
Answer
Correct Answer:
EROSION
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What prevents sliding metal surfaces from seizing?
Answer
Correct Answer:
Lubricant additive
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What is the general appearance of a emulsion?
Answer
Correct Answer:
Milky or cloudy
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What does the term emulsion mean?
Answer
Correct Answer:
Intimate mixture of oil and water
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An additive that promotes the formation of a stable mixture, or what?
Answer
Correct Answer:
Emulsion
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What type of additive promotes the formation of a stable mixture?
Answer
Correct Answer:
EmULSIFIER
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What is the increase in length expressed as a percentage of the original length?
Answer
Correct Answer:
LONGATION
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What term refers to the increase in length expressed as a percentage of the original length?
Answer
Correct Answer:
Elongation
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What is a servo-valve capable of doing?
Answer
Correct Answer:
Continuously controlling hydraulic output as a function of an electrical input
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In what way can a servo-valve control output as a function of input?
Answer
Correct Answer:
Continuously
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What type of servo-valve is able to continuously control hydraulic output as a function of an electrical input?
Answer
Correct Answer:
ELECTRO-HYDRAULIC SERVO VALVE
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What is the output of an electric motor measured in?
Answer
Correct Answer:
Horsepower
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What are examples of elastomers?
Answer
Correct Answer:
Natural rubber or thermoplastic
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What do you do to rubber when it gets too hot?
Answer
Correct Answer:
Soften
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What is an example of an emission?
Answer
Correct Answer:
Gas
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The escape, usually of gases, through a medium is called what?
Answer
Correct Answer:
EFFUSION
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What is a pump's volumetric efficiency?
Answer
Correct Answer:
The actual output
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How is the efficiency of a system usually expressed?
Answer
Correct Answer:
As a percentage
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What is the ratio of a pump's output to its input?
Answer
Correct Answer:
EFFICIENCY
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What protects the female body half when disconnected from the male tip half?
Answer
Correct Answer:
DUST PLUG
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Xcludes what?
Answer
Correct Answer:
Contamination
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What type of device protects the male tip half if disconnected?
Answer
Correct Answer:
DUST CAP
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A measure of elastomer hardness by use of a what?
Answer
Correct Answer:
Durometer
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What is a measure of elastomer hardness by use of a durometer?
Answer
Correct Answer:
DUROMETER HARDNESS
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What component of a gear pump rotates the driving gear?
Answer
Correct Answer:
Driving mechanism
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What is the name of the gear in a hydraulic gear pump that is rotated by the drive gear?
Answer
Correct Answer:
Driven gear
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What is the name of the gear that is attached to the driving mechanism?
Answer
Correct Answer:
The drive gear
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What is a condition that can be applied to a device to drift it?
Answer
Correct Answer:
Pre-set
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What type of measurement does drift normally take?
Answer
Correct Answer:
Varying
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What is another name for the manifold?
Answer
Correct Answer:
Vented
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A passage in, or line from, a hydraulic component which returns leaked fluid to the reservoir or a vented manifold is called what?
Answer
Correct Answer:
DRAIN
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Where does the passage beyond a device normally take place?
Answer
Correct Answer:
At the outlet
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What allows one hand push-to-connect or pull-to-disconnect convenience?
Answer
Correct Answer:
Other nomenclature "two-way sleeve"
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What allows one hand push-to-connect or pull-to-disconnect convenience when the quickaction coupling female half is clamp or bulkhead mounted and connected to a hose?
Answer
Correct Answer:
DOUBLE-ACTING SLEEVE
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What is a DOUBLE-ACTING SLEEVE another term for?
Answer
Correct Answer:
Two-way sleeve
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What type of cylinder can apply force and motion to the moveable element in both directions?
Answer
Correct Answer:
DOUBLE-ACTING CYLINDER
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A cylinder can apply motion and what else to the element?
Answer
Correct Answer:
Force
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How many hose assemblies are joined together by a common elbow?
Answer
Correct Answer:
Two
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What can be the case of the amount of liquid transferred from the inlet of the hydraulic pump to the outlet in a single revolution?
Answer
Correct Answer:
Displacement can be fixed
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What can be the case with displacement?
Answer
Correct Answer:
Variable
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What does the term "dirt tolerance" mean?
Answer
Correct Answer:
Internal clearance
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Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)
Answer
Correct Answer:
Q = π.D.b.Vf
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The overall efficiency for a Pelton wheel lies between
Answer
Correct Answer:
0.85 to 0.90
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Power required to drive a centrifugal pump is directly proportional to __________ of its impeller.
Answer
Correct Answer:
Fourth power of diameter
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The static head of a centrifugal pump is equal to the __________ of suction head and delivery head.
Answer
Correct Answer:
SUM
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A reciprocating pump is also called a __________ displacement pump.
Answer
Correct Answer:
Positive
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The efficiency of a reaction turbine for a given head __________ with the increase in speed.
Answer
Correct Answer:
Decreases
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For centrifugal pump impeller, the maximum value of the vane exit angle is
Answer
Correct Answer:
20° to 25°
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In the casing of a centrifugal pump, the kinetic energy of the water is converted into pressure energy before the water leaves the casing.
Answer
Correct Answer:
True
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A Francis turbine is used when the available head of water is
Answer
Correct Answer:
25 m to 250 m
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Manometric head, in case of a centrifugal pump, is equal to
Answer
Correct Answer:
All of these
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The speed of a turbine runner is
Answer
Correct Answer:
Directly proportional to H1/2
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Slip of a reciprocating pump is negative, when
Answer
Correct Answer:
Suction pipe is long and delivery pipe is short and the pump is running at high speeds
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Which of the following statement is wrong?
Answer
Correct Answer:
A Francis turbine is an impulse turbine.
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In a reciprocating pump, air vessels are fitted to the suction pipe and delivery pipe close to the cylinder of the pump.
Answer
Correct Answer:
False
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The maximum number of jets, generally, employed in an impulse turbine without jet interference are
Answer
Correct Answer:
Six
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If the ratio of all the corresponding linear dimensions are equal, then the model and the prototype are said to have
Answer
Correct Answer:
Geometric similarity
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The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is
Answer
Correct Answer:
High speed with axial flow at outlet
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When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases.
Answer
Correct Answer:
Agree
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A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit power of the wheel is
Answer
Correct Answer:
1.75 kW
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In an impulse turbine, the jet of water impinges on the bucket with a low velocity and after flowing over the vanes, leaves with a high velocity.
Answer
Correct Answer:
False
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