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BMS INSTITUTE OF TECHNOLOGY & MGMT YELAHANKA, BANGALURU – 560 064

DEPARTMENT OF MECHANICAL ENGINEERINGVII-Semester

Subject: Hydru!"cs #d P#eumt"cs $%&ME'()

%* T+e use , !".u"ds ,r /ses t, d, 0,r1 "s reerred t, s A2 3#eumt"c 3,0er*

42 +ydru!"c 3,0er* C2 5u"d 3,0er* D2 e!ectr"c! 3,0er*6* He7y !"t"#/ 0,r1 "s ,te# cc,m3!"s+ed by s+"t"#/ 5u"ds "# b"/ mc+"#es* T+e 3,0ersystem , suc+ mc+"#es c# be descr"bed s A2 rec"3r,ct"#/* 42 3#eumt"c* C2 +ydru!"c* D2 +ybr"d*(* A c,m3ress,r8 0+"c+ s.uee9es "r m,re #d m,re t"/+t!y8 "s 7"t! c,m3,#e#t "#

A2 +ydru!"c system*

42 3#eumt"c system* C2 mec+#"c! system* D2 e!ectr"c! system** 4,t+ 3#eumt"c #d +ydru!"c systems u#ct",# by e;ert"#/ 3ressure8 0+"c+ c# bede<#ed s A2 /s c,m3ressed "#t, sm!! 7,!ume* 42 3,0er* C2 0,r1* D2 ,rce ,# u#"t surce re*=* 4,y!e>s !0 sttes t+t A2 5u"ds #d /ses be+7e "# e;ct!y t+e sme 0ys* 42 s t+e 7,!ume , /s decreses8 "ts 3ressure "#creses*

C2 !! !".u"ds #d /ses 5,0* D2 ,rce 33!"ed t, !".u"d "s tr#sm"tted u#c+#/ed t, !! 3rts , t+e!".u"d*?* T+e sc"e#t"<c 3r"#c"3!e t+t m1es +ydru!"c systems 3,ss"b!e "s A2 Psc!>s 3r"#c"3!e* 42 4,y!e>s !0* C2 4er#,u!!">s 3r"#c"3!e* D2 t+e 5u"d 5,0 3r"#c"3!e*'* P#eumt"c #d ,t+er 3,0er systems c# su33,rt t+ree 1"#ds , m,t",#@ t+ey re A2 !"#er8 rec"3r,ct"#/8 #d r#d,m m,t",#* 42 !"#er8 5,0"#/8 #d r,try m,t",#*

C2 !"#er8 9"/9/8 #d s3"r! m,t",#* D2 !"#er8 rec"3r,ct"#/8 #d r,try m,t",#** A ,#e-0y 7!7e t+t !ets "r "#t, t+e reser7,"r , c,m3ress,r8 but d,es#>t !et "t ,ut8"s A2 c+ec1 7!7e* 42 rece"7er 7!7e* C2 c,#tr,! 7!7e* D2 t+ree-0y 7!7e*B* I# # ,!d cr 0"t+,ut 3,0er steer"#/8 t+e dr"7er steers +e7"!y t, tur# 0+ee!s #d;!es8 but "# m,der# cr8 steer"#/ 5u"d d,es m,st , t+e 0,r1* P,0er steer"#/ "s #e;m3!e , A2 3#eumt"c 3,0er t 0,r1*

42 +ydru!"c 3,0er t 0,r1* C2 mec+#"c! 3,0er t 0,r1*

%

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Subject: Hydru!"cs #d P#eumt"cs $%&ME'() D2 m/#et"c 3,0er t 0,r1*

%&* S,me #t"7e +u#ters , S,ut+ Amer"c>s Am9,# bs"# use +,!!,0 tubes t, b!,03,"s,#ed drts t t+e"r 3rey* T+"s tec+#,!,/y "s # e;m3!e , A2 rec"3r,ct"#/ system* 42 mec+#"c! system* C2 +ydru!"c system*

D2 3#eumt"c system

11. Pascal’s law states that pressure in a confned body o uid will act_______________in all directions.

A. erratically

B. equally

C. orward

D. sequentially

1. Pressure in a hydraulic syste! is "enerated by ___________ to ow.

A. acceptance

B. i!!unity

C. resistance

D. co!pliance

1#. $orce % __________ & ____________

A. ow & distance

B. wor' & ti!e

C. pressure & ow

D. pressure & area

1(. )ost o the ener"y not used to !o*e the load in a hydraulic syste! turns into____________.

A. heat

B. li"ht

C. potential

D. e&cre!ent1+. ,he relie *al*e is a nor!ally closed *al*e. ,he ter! -closed !eans that in the power o/

condition the *al*e is0

A. open to ow

B. closed to ow

C. adustable

D. non2adustable

13. 4hen the co!pensator settin" o a pressure co!pensatin" hydraulic pu!p is reached the

pu!p *olu!e will0

A. du!p bac' to tan' throu"h the relie *al*e

6

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B. du!p bac' to tan' throu"h the co!pensator

C. be reduced to only what the syste! needs

D. be reduced until the pressure drops to near 5

16. 4hat is the nu!ber one reason why pu!ps ca*itate7

A. low uid le*el

B. air lea' in the suction line

C. plu""ed suction strainer

D. electric !otor dri*in" at an 8P) that is too low

19. 4hat f*e characteristics does the *al*e below ha*e7

A. :or!ally open; (2way; position; detent; hydraulically actuated

B. :or!ally open; two2way; three position; sprin" return; solenoid actuated

C. :or!ally closed; two position; two2way; sprin" return; solenoid actuated

D. :or!ally open; two position; two2way; sprin" return; hydraulically actuated

1<. 4hich *al*e center position would be best to use with a f&ed displace!ent pu!p7

A B C

A

B

C

D. All o the choices would wor' equally well

5. 4hich o the *al*e actuators indicates a solenoid *al*e7

A B

A

(

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B

C. Both *al*es are the sa!e si=e

D. >ither *al*e could be lar"er

1. ,he pressure reducin" *al*e shown below is0

A. nor!ally open

B. nor!ally closed

C. non2adustable

D. solenoid actuated

. 4hat type "as should nor!ally be used to char"e an accu!ulator7

A. ?&y"en

B. Co!pressed air

C. :itro"en

D. Acetylene#. @n prechar"in" an accu!ulator used or *olu!e; i there are no desi"ner reco!!endations a

"ood settin" or !ost syste!s is

A. the sa!e as the co!pensator settin"

B. the sa!e as the relie *al*e settin"

C. one hal the !a&i!u! syste! pressure

D. 15 abo*e the !a&i!u! syste! pressure

(. 4hen usin" a hydraulic accu!ulator or *olu!e and the accu!ulator is operatin" properly; heat

should be elt0

A. all o*er the accu!ulator shell

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B. in the lower 12# o the shell

C. at the botto! o the shell only

D. at the du!p *al*e only

+. 4hen usin" an accu!ulator or shoc' it should be0

A. installed as ar as possible away ro! the co!ponent it protects

B. pre2char"ed appro&i!ately 1555 P@ abo*e the !a&i!u! syste! wor'in" pressure

C. one "allon or s!aller in si=e

D. !ounted hori=ontally

3. ,he sy!bol shown below indicates0

A. a re!otely !ounted ow control

B. a f&ed orifce ow control

C. a pressure co!pensatin"; *ariable orifce ow control

D. a te!perature and pressure co!pensated *ariable ow control

6. 4hat deter!ines the speed o a hydraulic cylinder or a !otor7

A. yste! pressure

B. A!ount o oil ow

C. 4ei"ht o the load

D. Directional *al*e center position

28. $luid power circuits use sche!atic drawin"s to0

A. si!pliy co!ponent unction details.

B. !a'e it so only trained persons can understand the unctions.

C. !a'e the drawin" loo' i!pressi*e.

<. A pneu!atic sy!bol is0

A. di/erent ro! a hydraulic sy!bol used or the sa!e unction.

B. the sa!e as a hydraulic sy!bol used or the sa!e unction.

C. not to be co!pared to a hydraulic sy!bol used or the sa!e unction.

#5. )ost hydraulic circuits0

A. operate ro! a central hydraulic power unit.

B. use air2o*er2oil power units.

C. ha*e a dedicated power unit.#1. ydraulic and pneu!atic circuits0

=

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Subject: Hydru!"cs #d P#eumt"cs $%&ME'()A. peror! the sa!e way or all unctions.

B. peror! di/erently or all unctions.

C. peror! the sa!e with so!e e&ceptions.#. eries circuits wor' on both hydraulic and pneu!atic actuators.

A. ,rue

B. $alse

##. 4hen co!parin" frst cost o hydraulic syste!s to pneu!atic syste!s; "enerally they are0

A. !ore e&pensi*e to purchase.

B. less e&pensi*e to purchase.

C. cost about the sa!e.

#(. 4hen co!parin" operatin" cost o hydraulic syste!s to pneu!atic syste!s; "enerally they are.

A. !ore e&pensi*e to operate.

B. less e&pensi*e to operate.

C. cost about the sa!e to operate.

#+. ,he !ost co!!on hydraulic uid is0

A. !ineral oil.

B. synthetic uid.

C. water(?* Psc!>s !0 sttes t+t 3ressure "# c,#<#ed b,dy , !".u"d 0"!! ct"#!! d"rect",#s*

A* errt"c!!y4* e.u!!yC* ,r0rdD* se.ue#t"!!y

('* Pressure "# +ydru!"c system "s /e#erted by t, 5,0*A* cce3t#ce4* "mmu#"tyC* res"st#ceD* c,m3!"#ce

(* T+e re!"e 7!7e "s #,rm!!y c!,sed 7!7e* T+e term c!,sed me#s t+t "# t+e3,0er , c,#d"t",# t+e 7!7e "s:

A* O3e# t, 5,04* C!,sed t, 5,0

C* Adjustb!eD* N,#-djustb!e

39. What five characteristics does the valve below have?

A. Normally open, 4way, 2 position, detent, hydra!lically act!ated

". Normally open, twoway, three position, sprin# ret!rn, solenoid act!ated

$. Normally closed, two position, twoway, sprin# ret!rn, solenoid act!ated

%. Normally open, two position, twoway, sprin# ret!rn, hydra!lically act!ated

?

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Subject: Hydru!"cs #d P#eumt"cs $%&ME'()40. List the three main types of motors.

a. ____________________________________________________

b. ____________________________________________________c. ____________________________________________________

41. Torque is related to: ____________________ Speed is related to : _________________

42. List three reasons to use a hydraulic motor instead of an electric motor.

a. ____________________________________________________

b. ____________________________________________________

c. ____________________________________________________

44. What is a symbol for a sinle actin cylinder!

4". What is a symbol for a double actin cylinder!

4#. What is a symbol for a double end rod cylinder!

4$. What is a symbol for a motor!

4%. The follo&in description is of a ___________type cylinder. 'luid flo&s into a port in only one

end of the cylinder. The rod returns to position by means of ra(ity or a

sprin.). sinle actin

*. double actin

+. double end rod

,. cushioned

-. reenerati(e

'. telescopin

4. The follo&in description is of a _______________________ type cylinder. 'luid can

flo& into a port on either end of the cylinder. /t etends and retracts under fluid po&er. /t has a rod

etendin from one end.

). sinle actin

*. double actin

+. double end rod

,. cushioned

-. reenerati(e

'. telescopin

"0. The follo&in description is of a _______________________ type cylinder. ) cylinder

&hich slo&s near the end of the stroe.

). sinle actin

*. double actin

+. double end rod

,. cushioned-. reenerati(e

'

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Subject: Hydru!"cs #d P#eumt"cs $%&ME'()'. telescopin

"1. The follo&in description is of a _______________________ type cylinder. ) cylinder in

&hich there are multipistons &hich etent the lenth of a stroe and &hich are placed one inside theother.

). sinle actin

*. double actin

+. double end rod

,. cushioned

-. reenerati(e

'. telescopin

"2. Which of the follo&in is not true of a fluid!

). increases &or

*. is incompressible

+. transmits pressure in all directions,. has shape of its o&n

"3. Who &as the first man to build hydraulic systems to &or on farm tractors as &e no& it today!

). oseph *ramah

*. 5arry 'eruson

+. *ernoulli

,. 6ascal

-. Torricelli

"4. Who disco(ered this principle7la&! 6ressure applied on a confined fluid is transmitted

undiminished in all directions and acts &ith equal force on equal areas and at riht anles to them.

). oseph *ramah*. 5arry 'eruson

+. *ernoulli

,. 6ascal

-. Torricelli

"#. Which one of the follo&in is not a function of a reser(oir!

). helps fluid to cool

*. hold fluid at lo& pressure

+. allo&s air to separate

,. allo&s contaminates to settle

-. stores fluids under pressure

"$. 8iscosity of a fluid refers to the:

). measure of a fluid9s resistance to flo&.

*. lo&est temperature at &hich the fluid &ill pour.

+. fluids resistance to cold.

,. additi(e miture.

-. life of a fluid.

"%. The lo&est temperature at &hich a fluid &ill flo& is called its:

a. pour point

b. (iscosity number

c. actuator

d. saybolt fluid pointe. pump point

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Subject: Hydru!"cs #d P#eumt"cs $%&ME'()". 5ih (iscosity fluids that can be pumped are:

a. more liely to cause sluish operation of cylinders

b. more liely to leac. harder to separate air from oil in the reser(oir

d. more liely to cause &ear of parts

e. ) and + f. ) and ,

#0. Lo& (iscosity fluids tend to:

a. cause sluishness

b. lea more

c. mae it harder to separate air from oil in reser(oir

d. more liely to cause &ear of parts e. * and ,

#1. The component or part of a component &hich helps air separate from fluid encouraes

trash settlin to the bottom and causes the fluid to not be recycled throuh the system quicly is call

the:

a. filter

b. strainer

c. accumulator

d. baffle

e. (al(e

f. one of these#2. Which of the follo&in is an actuator:

a. reser(oir

b. motor

c. pump

d. cylinder

e. hose

f. * and ,

#3. 'luid returnin to the reser(oir is:

a. hotter than fluid in the reser(oir

b. cooler than fluid in the reser(oir

c. There is no difference

#4. What is the symbol for a reser(oir!

#". Which of the follo&in is ;T a fied displacement pump

a. -ternal <ear

b. /nternal <ear

c. =adial 6iston

d. *alanced 8ane

##. ) s&ashplate is used in the _______________ type pump.a. )ial 6iston

B

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Subject: Hydru!"cs #d P#eumt"cs $%&ME'() b. /nternal <ear

c. =adial 6iston

d. *alanced 8anee. -ternal <ear

#$. +hanin the position of the s&ashplate &ill7may:

a. chane the torque

b. chane the (olume of fluid pumped

c. chane the direction of fluid flo&

d. all of the abo(e

#%. ) direct actin relief (al(e is operated by:

a. full hydraulic pressure

b. manual controls

c. partial hydraulic pressure

d. pneumatic pressuree. electric solenoid

#. ) pilot operated relief (al(e is operated by:

a. hydraulic pressure

b. manual controls

c. electric solenoid

d. pneumatic pressure

$0. The purpose of a relief (al(e is to:

a. pre(ent circuit o(erload

b. maintain a proportional pressure in branch circuits

c. direct flo& to a priority circuitd. none of the abo(e

e. all of the abo(e

$1. The purpose of a pressure reducin (al(e is to eep the pressure in one branch of the

circuit _________ that of the main circuit.

a. abo(e

b. belo&

c. equal to

d. none of the abo(e

$2. The purpose of a pressure sequencin (al(e is to:

a. pre(ent circuit o(erload


c. direct flo& to a priority circuit

d. hold the (al(e in place until it completes a cycle

e. none of the abo(e

$3. The purpose of an unload (al(e is to:

a. eep from usin the relief (al(e to dump oil bac to reser(oir.



d. none of the abo(e

$4. The most common type of directional (al(e is a:

a. rotary (al(e b. spool (al(e

%&

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Subject: Hydru!"cs #d P#eumt"cs $%&ME'()c. chec (al(e

d. pressure relief (al(e

$". ) (al(e &ith detent &ill:a. pre(ent circuit o(erload



d. hold the (al(e in place until it completes a cycle

e. none of the abo(e

$#. ) stac (al(e is:

a. a sinle lare casted (al(e

b. se(eral (al(e bodies bolted toether

c. used mostly &ith rotary (al(es

d. allo& etra (al(es to be added later

e. a b and c

$$. ) (al(e used to limit or reduce pressure.

a. ,irectional control

b. 6ressure control

c. 8olume control

d. >anual control

e. 6ilot (al(e

$%. ) (al(e that reulates the amount of flo&.

a. ,irectional control

b. 6ressure controlc. 8olume control

d. >anual control

e. 6ilot (al(e

$. The measure of the t&istin force on a shaft!

a. torque in ft. lbs.

b. bac pressure in psi

c. pm

d. psi e. rpm

%0. /f a piston is pushin do&n&ard &ith a force of "00 pounds and the area of the piston is "

sq. inches &hat is the pounds pressure per?square inch @6S/A!

a. 10

b. 100

c. 1000

d. 2"00

e."000

%1. /f a dri(e piston has a force of 300 6S/ and the dri(en piston has an area of 10 square

inches ho& many lbs. can be lifted!

a. 30

b. 300

c. 1000

d. 3000e. none of the abo(e

%%

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Subject: Hydru!"cs #d P#eumt"cs $%&ME'()%2. /f a dri(en piston must lift 2"00 lbs. and the dri(en piston has an area of 10 square inches

&hat 6S/ is required!

a. 100 b. 2"0

c. "00

d. 1000

e. 2"00

%3. /f a dri(en piston must lift 2"00 lbs. and the pressure pro(ided is 100 6S/ &hat siBe piston

is required!

a. "

b. 10

c. 2"

d. 2"0

e. 2"000

%4. /f you ha(e a cylinder that has a 10 inch stroe and has an area of 12 sq. inches &hat

amount of fluid &ould be required to fill the area!

a. 120 sq in

b. 120 cu in

c. 1200 sq in

d. 1200 cu in

e. 4$1.24 cu in

%". /f you ha(e a cylinder that has a 24 inch stroe and has a diameter of # inches &hat

amount of fluid &ould be displayed!a. 12 sq in

b. 144 cu in

c. 144 sq in

d. 1#.#4 cu in

e. #$%."% cu in

%#. What 6S/ is required to lift 12000 lbs. if the dri(en piston had a diameter of # inches!

a. 42

b. 4#"

c. 2000

d. 42"

e. 200

%$. /f you ha(e a cylinder that has a 1# inch stroe and has an area of 12 sq. inches and the

time required to complete one stroe is 10 seconds &hat (olume of fluid is displaced in one minute!

a. 12 cu in

b. 1#0

c. 12

d. 11"2

e. 120

%%. /f you ha(e a cylinder that has a 112 inch stroe and has an area of 10 sq. inches and the

time required to complete one stroe is 10 seconds &hat (olume in <6> is displaced!

a. 4. b. ".

%6

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Subject: Hydru!"cs #d P#eumt"cs $%&ME'()c. 2.

d. 11"2

e. 120

%(

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