mcq of ifp

8/20/2019 Mcq of IFP

1/27

1. A needle valve controls flow in:

A. both directions.

B. one direction.

C. neither direction.

2. Pressure-compensated flow control valves maintain a constant flow:

A. because they have a special needle valve.

B. when pressure stays under 2000 psi.

C. because they maintain a constant pressure drop across the orifice.

. A -port flow control:

A. can control different flows to several actuators at once.

B. can only control one actuator at a time

C. operates at ma!imum pressure for the whole cycle.

". A #0-#0 spool-type flow divider valve can:

A. split flow in both directions.

B. only split flow in one direction.

C. is not used to split flow.

#. A priority flow divider$s priority outlet:

A. chan%es flow as inlet flow chan%es.

B. chan%es flow as inlet pressure chan%es.

C. has constant flow when inlet flow is e&ual to or %reater than its volume.

'. Pressure at the inlet of a spool-type flow divider is:


2/27

A. e&ual to the lowest outlet pressure.

B. e&ual to the hi%hest outlet pressure.

C. e&ual to the avera%e of the sum of the outlet pressures.

(. )otor flow dividers use:

A. hydraulic motors in series to split flow.

B. hydraulic motors in parallel to split flow.

C. flow control valves to split flow.

*. Pressure at the inlet of a motor flow divider is:

A. e&ual to the lowest outlet pressure.

B. e&ual to the hi%hest outlet pressure.

C. e&ual to the avera%e of the sum of the outlet pressures.

PUMP

1. A rule of thumb for air compressor

output for each input horsepower is:

+. ,his symbol is for a:

A. motor flow divider.

B. priority flow divider.

C. spool-type flow divider.

10. ,his symbol is for a:

A. pressure-compensated flow control.

B. non-compensated flow control.

C. -port flow control.


3/27

A. 2 scfm 100 P/

B. scfm 100 P/

C. " scfm 100 P/

2. ar%e air compressors load and unload as pressure drops and builds. mall air compressors:

A. do the same.

B. never build enou%h pressure.

C. turn on at a minimum pressure and off at a ma!imum pressure.

. A hydraulic pump produces:

A. flow in %allons per minute %pm.

B. pressure in pounds per s&uare inch psi.

C. both of the above.

". A positive-displacement pump:

A. cannot turn if the outlet is bloc3ed.

B. can turn with the outlet bloc3ed.

C. can only turn with the outlet bloc3ed.

#. 4ear pumps:

A. can be variable volume.

B. cannot be variable volume.

C. can be pressure compensated.


4/27

'. 5ane pumps:



C. cannot be pressure compensated.

(. Piston pumps .



C. cannot be pressure compensated.

*. An open-center circuit:

A. bloc3s pump flow in the center condition.

B. does not have a center condition.

C. allows pump flow to %o to tan3 in center condition.

+. A closed-center circuit:

A. bloc3s pump flow in the center condition.

B. does not have a center condition.

C. allows pump to %o to tan3 in center condition.

10. ,he symbol at ri%ht is a:

A. pressure-compensated

variable-volume pump.

B. fi!ed-volume pump.

C. bi-directional pump.


5/27

11. 6hile the input shaft of a bi-directional pump is turnin% in one direction of rotation7 it:

A. can move fluid from either port.

B. can only move fluid from one port.

C. must have a suction line hoo3ed to tan3.

12. 6obble-plate piston pumps:

A. must rotate in the opposite direction to reverse flow.

B. can reverse flow while turnin% the same way.

C. cannot reverse flow at anytime.

1. wash-plate piston pumps:

A. have moveable or fi!ed-an%le swash plates.

B. are always bi-directional.

C. can only move fluid one way.

1". Bent-a!is pumps :

A. cannot be fi!ed volume.

B. operate better at hi%her vacuum inlet.

C. cannot be bi-directional flow.

1#. oad-sensin% pumps:

A. operate at load pressure plus load-sense bias sprin% pressure.

B. operate at compensator pressure at all times.


6/27

C. cannot be variable volume.

1'. 8orsepower- and tor&ue-limitin% pumps:

A. use e!tra horsepower all the time.

B. use minimum horsepower all the time.

C. never use more than a preset horsepower re%ardless of pressure.

1(. Pump shaft ali%nment is not important at any time.

A. ,rue

B. 9alse

1*. Closed-loop circuits:

A. use a ma3eup pump to 3eep the loop full.

B. must have e!tra lar%e flow lines to 3eep the pump from cavitatin%.

C. cannot reverse the direction of an actuator.

1+. A pump-motor adapter is:

A. a device to 3eep the pump from cavitatin%.

B. a unit to match pump horsepower to motor horsepower.

C. a device to directly attach a pump to an electric motor.

20. Cavitation is caused by:

A. too little fluid volume at the pump inlet.


7/27

B. too much fluid volume at the pump inlet.

C. too much fluid volume at the pump outlet.

REservior

1. Air-cooled heat e!chan%ers:

A. are less e!pensive than water-cooled heat e!chan%ers.

B. are not as efficient as water-cooled heat e!chan%ers.

C. re&uire a water hoo3up.

2. ,he watt density of immersion-type tan3 heaters should never e!ceed:

A. 2 to " watts per s&uare inch.

B. " to ' watts per s&uare inch.

C. * to 10 watts per s&uare inch.

. A hydraulic reservoir is normally sied at:

A. 1 to 2 times pump flow in %pm.

B. 2 to times pump flow in %pm.

C. " to ' times pump flow in %pm.

". ,he main purpose of the hydraulic tan3 is to:

A. hold enou%h fluid for the circuit.

B. deaerate the returned fluid.

C. cool the fluid.


8/27

#. ,he symbol at ri%ht shows a

line that:

A. returns below fluid level.

B. returns above fluid level.

C. is on the same side as the

suction line.

'. /nlet and return lines should:

A. terminate below fluid level.

B. terminate above fluid level.

C. terminate anywhere that is convenient.

(. ;ne can always trust the si%ht %lass for accurate fluid volume.

A. ,rue

B. 9alse

*. ,he best confi%uration for pump and reservoir is:

A. pump on top.

B. pump alon%side.

C. pump underneath.

+. All heat in a hydraulic system comes from:

A. wasted ener%y.

B. too lar%e electric motor.

C. oversie pipin% and valves.


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10. A pneumatic system


10/27

B. ma3in% up for system lea3s

C. providin% an emer%ency power supply

#. Prechar%e pressure should be chec3ed at least every:

A. one to two months

B. two to three months

C. three to si! months

'. An accumulator may be used to:

A. ma3e a pump run faster

B. ma3e a valve shift more &uic3ly

C. ma3e up for system lea3s

(. Accumulator pre-char%e pressure is normally.

A. +#= of minimum system pressure

B. *#= of minimum system pressure

C. (#= of minimum system pressure

*. 6hen the pump is runnin%7 an accumulator dump valve 3eeps fluid:

A. from %oin% to the accumulator

B. from %oin% to the circuit

C. from %oin% to tan3


11/27

+. An unloadin% relief valve sends:

A. pump flow to tan3 at system pressure

B. accumulator flow to tan3 at system pressure

C. pump flow to tan3 at 2# to100 psi

10. ,his symbol represents a:

A. wei%ht-loaded accumulator

B. %as-char%ed accumulator

C. sprin%-loaded accumulator

Valves

1. >uic3 e!haust valves allow:

A. air to e!it the cylinder rapidly

B. oil to e!it the cylinder rapidly

C. both of the above

2. A &uic3 e!haust valve is always mounted:

A. close to the directional valve port

B. at the directional valves inlet port

C. close to the cylinder port

. peed control mufflers only wor3 as:

A. meter out flow controls

B. meter in flow controls


12/27

C. bleed-off flow controls

". A pressure %au%e readin% P/A shows:

A. only positive pressure

B. only ne%ative pressure

C. both positive and ne%ative pressure

#. ,his is a symbol for a:

A. temperature %au%e

B. pressure %au%e

C. flow meter

'. 9low meters can measure flow in:

A. )P8

B. ?P)

C. C9)

(. huttle valves allow flow in.

A. one direction only

B. both directions

C. either direction after reachin% set pressure

*. ?otary unions can pass:


13/27

A. air only

B. air and oil

C. air7 oil and electrical

+. >uic3 disconnects for air circuits:

A. bloc3 flow from both lines

B. bloc3 flow from the machine side only

C. bloc3 flow from the supply side only

10. A pressure switch indicates an actuator:

A. has completed its stro3e

B. is half way throu%h its stro3e

C. has built pressure no matter the position

actuators

>ui on information learned from chapter 1#

1. A ram cylinder can only have@@@@@@@@@@@@@@@@@in one direction.

A. movement

B. force

C. rotation

2. A ram cylinder has:

A. a piston with seals to %uide it

B. no piston or seals to %uide it


14/27

C. a non-sealin% %uide only

. ,he area of a cylinder is fi%ured with the formula:

A. 9PA

B. r 2

C. d2

". Cylinder force or thrust is fi%ured by the formula:

A. 9PA

B. r 2

C. d2

#. A 2:1 area ratio cylinder has a rod that is:

A. half the diameter of the piston

B. twice the diameter of the piston

C. half the area of the piston

'. A double rod-end cylinder with the same pressure at either end can have:

A. e&ual force and speed in both directions of travel

B. hi%her force in one direction of travel

C. either of the above

(. 6ith the same pressure at either end a sin%le-rod end cylinder has:


15/27

A. e&ual force in both directions of travel

B. more force e!tendin%

C. more force retractin%

*. Cable cylinders are:

A. twice as lon% as their stro3e

B. three times as lon% as their stro3e

C. sli%htly lon%er than their stro3e

+. on-?otatin% rod cylinders:

A. allow no radial movement of the piston rod

B. only allow some radial movement of the piston rod

C. can allow a lot of radial movement of the piston rod


A. non-cushioned cylinder

B. cushion rod end only cylinder

C. cushion both ends cylinder

11. ,andem cylinders can have almost@@@@@@@@@@@@@@@@@the force as a sin%le cylinder.

A. twice

B. three times

C. four times


16/27

12. Diaphra%m cylinders have:

A. small area and lon% stro3es

B. lar%e area and lon% stro3es

C. lar%e area and short stro3es

1. Always sie an air cylinder with at least:

A. 10= more force than re&uired

B. 2#= more force than re&uired

C. (#= more force than re&uired

1". A cylinder with an actual 2:1 rod in a re%eneration circuit will:

A. e!tend twice as fast as retract

B. e!tend and retract at the same speed

C. cannot re%enerate a 2:1 rod cylinder

1#. 8ydraulic motors are usually rated in:

A. pounds force

B. lb-in.7 lb-ft7 or ewton-meters tor&ue

C. horsepower

1'. 4ear on %ear hydraulic motors offer:

A. hi%h-tor&ueElow-speed output


17/27

B. hi%h-speedElow-tor&ue output

C. hi%h-speedEnominal-tor&ue output

1(. A!ial or inline piston motors offer:


B. hi%h-speedEhi%h-tor&ue output

C. both of the above

1*. ?adial piston hydraulic motors offer:


B. hi%h-speedElow-tor&ue output

C. hi%h-speedEnominal-tor&ue output

1+. in%le vane rotary actuators %ive up to:

A. +0F rotary output

B. 1*0F rotary output

C. 2(0F rotary output


A. hydraulic rotary actuator.

B. pneumatic rotary actuator.

C. neither of the above.

1. )ost hydraulic circuits are desi%ned by:


18/27

A. mechanical en%ineers.

B. fluid power en%ineers.

C. fluid power distributor salesmen.

2. Atmospheric pressure at sea level is e&ual to appro!imately:

A. 1".( 8%

B. 1".( psi

C. 0 psi

. 4au%es that read pounds per s&uare inch absolute psia:

A. show atmospheric pressure on their scales.

B. do not show atmospheric pressure on their scales.

C. have nothin% to do with atmospheric pressure.

". tatic head pressure of hydraulic oil is e&ual to appro!imately:

A. .1 psi per foot of elevation.

B. .2 psi per foot of elevation.

C. ." psi per foot of elevation.

#. ,he power of vacuum comes from:

A. the power of a pump.

B. earth


19/27

(. Pascal


20/27

. ' in.

. 6hat is the recommended fluid velocity for a suction lineG

1. 2 to " fps

2. 10 to 1# fps

. 0 fps

". A %rid system for plant air pipin% re&uires:

1. several small compressors

2. several lar%e compressors

. one ade&uately sied compressor

#. 9or hydraulic lines up to and includin% 2 in.7 use:

1. steel tubin%

2. blac3-iron pipe

. plastic pipe

'. Always ta3e drop lines in an air pipin% circuit from the:

1. bottom of the header

2. side of the header

. top of the header

(. Hlbows are better than smooth tubin% bends.

1. ,rue

2. 9alse

*. ,he pipes in an air plumbin% system should be:

1. sloped away from the receiver tan3

2. sloped toward the receiver tan3


21/27

. level

+. 8ose sie is desi%nated by its:

1. /D

2. ;D

. D

10. 5elocity in hydraulic circuit return lines should be:

1. 2 to " fps.

2. 10 to 1# fps.

. 1# to 20 fps.

FILters

. ;ne micrometer or micron7 or m measures:

A. .0000+I

B. .000020I

C. .000010I

2. Common filter locations are:

A. suction line7 cylinder line and return line.

B. suction line7 pressure line and return line.

C. pressure line7 return line and pilot line.

. A bi-directional filter uses:

A. four chec3 valves to direct flow throu%h the element.

B. filter elements that can ta3e flow in either direction.

C. two filters in one housin%.


22/27

". An airline lubricator introduces:

A. a small amount of anti-freee to the air line.

B. a small amount of oil to the air line.

C. a small amount of sealant to the air line.

#. ?efri%eration type air dryers remove water from an air line by:

A. a chemical absorbent action.

B. a chemical adsorbent action.

C. reducin% the temperature of the air.

'. ;ff line filtration loops can be used to:

A. filter the fluid.

B. cool the fluid.

C. heat the fluid.

(. ervo valve circuits re&uire a pressure-line filter without a bypass.

A. ,rue

B. 9alse

*. /; cleanliness level numbers:

A. start with hi%her numbers and %o to lower numbers 1'E1"E11.

B. start with lower numbers and %o to hi%her numbers 11E1"E1'.

C. do not have a particular number pattern.

+. A coalescin% filter can remove particles down to:


23/27

A. 0.1m

B. 0.2m

C. 0.m

10. A filter$s Beta ratio ratin% indicates:

A. what sie and how many particles the filterwill remove.

B. what sie and what type particles the filterwill remove.

C. the sie and shape of the particles the filter will remove.

Intensifer

1. Air-oil systems use@@@@@@@for power and@@@@@@@as the controllin% medium.

A. oil7 air

B. water7 oil

C. air7 oil

2. Attached oil control units can control cylinder action:

A. both ways

B. on e!tension only

C. on retraction only

. ar%e-diameter air-oil tan3s:

A. increase pressure at the outlet

B. decrease pressure at the outlet

C. have no effect on pressure at the outlet


24/27

". Jou should sie oil-flow lines in an air-oil circuit for:

A. 2 to " fps velocity

B. " to * fps velocity

C. 10 to 1# fps velocity

#. ,andem cylinders can be used in:

A. synchroniin% circuits

B. circuits that re&uire mid-stro3e stoppin%

C. two-speed circuits

D. all of the above

'. ,he oil output volume from an air-to-oil intensifier is e&ual to:

A. air input volume

B. a lar%e portion of air input volume

C. a small portion of air input volume

(. ;utput pressure from an air-to-oil intensifier is controlled by.

A. the area ratio of the pistons andEor rams involved

B. the len%th of stro3e

C. the sie of the outlet port

*. Air-to-air intensifiers:

A. run continuously7 re%ardless of output pressure


25/27

B. stall when output pressure on the intensifier piston reaches input pressure

C. stall when output pressure on the intensifier piston tries to %o hi%her than input pressure

times area ratio

+. Air-to-air intensifiers are %ood for:

A. hi%h volumes of air at increased pressure

B. medium volumes of air at increased pressure

C. low volumes of air at increased pressure

10. ,his symbol represents:

A. a double-rod cylinder

B. an intensifier

C. a hi-lo pump

1. An air line re%ulator is:

A. normally open

B. normally closed

C. normally neutral

2. An air se&uence valve is usually a:

A. pilot-operated -way valve

B. pilot-operated "-way valve

C. pilot-operated #-way valve


26/27

. 8ydraulic se&uence valves are normally used in conKunction with:

A. multi-cylinder circuits with flow control valves

B. multi-cylinder circuits and a sin%le directional control valve

C. multi-cylinder circuits in place of a relief valve

". 8ydraulic 3ic3-down se&uence valves :

A. open at set pressure and maintain inlet pressure

B. open at set pressure and drop inlet pressure to outlet port pressure

C. close at set pressure

#. /nternally piloted counterbalance valves$ main advanta%e is:

A. Ker3y action as the load is lowered

B. they never need to be re-adKusted at load chan%e

C. smooth7 controlled e!tend action of the load

'. H!ternally piloted counterbalance valves:

A. drop all bac3pressure at load contact

B. must be adKusted for load chan%es

C. have very smooth and controlled action durin% e!tension

(. 8ydraulic reducin% valves maintain pressure by:

A. openin% when reachin% set pressure


27/27

B. closin% when reachin% set pressure

C. sendin% fluid to tan3 at set pressure

*. 8ydraulic reducin% valves:

A. never need a bypass chec3 valve

B. always need a bypass chec3 valve

C. need a bypass chec3 valve when flow must be reversed

+. 8ydraulic reducin% relievin% valves:

A. send pump flow to tan3 Kust above set pressure

B. send actuator flow to tan3 at pressure Kust above set pressure

C. never send any system flow to tan3


A. se&uence valve

B. counterbalance valve

.

C. reducin% valve

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