OBJECTIVE QUESTIONS FROM GATE/IES/IAS
1. Match the items in columns I and II Column I P. Higher kinematic pair Q. Loer kinematic pair ". Quick return mechanism %. Mobilit& o a linkage
+a, P-! Q-* "-( %-# +c, P-* Q-! "-) %-# A!"#$%& d
[GATE-2006]
Column II 1. Grubler's equation !. Line contact #. $uler's equation (. Planer ). %haper *. %urace contact +b, P-* Q-! "-( %-1 (d) P-2, Q-6, R-5, S-
!. /he minimum number o links in a single degree-o-reedom de gree-o-reedom planar mechanism ith both higher and loer kinematic pairs is [GATE-2002] (') +a, ! +b, # +d, ) A!"#$%& '
#. /he number degrees o reedom o a planar linkage ith 0 links and simple re2olute 3oints is [GATE2005] (') +a,1 +b, ! +d,( A!"#$%& '
(. 4hen a c&linder is located in a 5-block then number o degrees o reedom hich are arrested [GATE-200] is +a, ! +b, ( +d, 0 (') * A!"#$%& '
). /he number o degrees o reedom o a i2e link plane mechanism ith i2e re2olute pairs as [GATE-++] shon in the igure is (')2 +a, # +b,( +d, 1 A!"#$%& '
*. 6 planar mechanism has 0 links and 17 rotar& 3oints. /he number o degrees o reedom o the mechanism using Grubler's criterion is [GATE-200] () +a, 7 +c, ! +d, # A!"#$%&
8. Match the approaches gi2en belo to perorm stated kinematics9d&namics anal&sis o [GATE -200+] machine. 6nal&sis 6pproach P. Continuous relati2e rotation 1. :;6lembert;s principle Q. 5elocit& and acceleration !. Grubler;s criterion ". Mobilit& #. Grasho;s la %. :&namic-static anal&sis (.
0. 4hich o the olloing statements is incorrect
[GATE-200]
(.) G%."1" %34$ ".$" . 1% . 4.!.% '%.!7-%'7$% 13% .% 8$'.!9"8, $ "38 1 $ "%$" .!d 4!:$" 49!7 4$!:" '.!! $ 4$"" .! $ "38 1 $ %$8.9!9!: # 49!7 4$!:";
+b, In2ersions o a mechanism are created-b& i=ing dierent links one at a time. +c, Gene2a mechanism is an intermittent motion de2ice. +d, Gruebler's criterion assumes mobilit& o a planar mechanism to be one. A!"#$%& .
. In a our-bar linkage % denotes the shortest link length L is the longest link length P and Q are the lengths o other to links. 6t least one o the three mo2ing links ill rotate b& #*7o i [GATE-2006] (.) S < = > P < Q +b, % > L ? P > Q +c, % > P@L > Q +d, % > P ? L > Q A!"#$%& .
17. /he number o in2ersions or a slider crank mechanism is (') +a, * +b, ) +d, #
[GATE-2006]
A!"#$%& '
11. /he mechanism used in a shaping machine is +a, 6 closed (-bar chain ha2ing ( re2olute pairs +b, 6 closed *-bar chain ha2ing * re2olute pairs +c, 6 closed (-bar chain ha2ing ! re2olute and ! sliding pairs (d) A! 9!?$%"9! 1 $ "9!:4$ "49d$%-'%.!7 '.9! A!"#$%& d
[GATE-200]
1!. Match the olloing /&pe o Mechanism Motion achie2ed P. %cott - "ussel mechanism 1. Intermittent motion Q. Gene2a mechanism !. Quick return motion ". A-set slider-crank mechanism #. %imple harmonic motion %. %cotch Boke mechanism (. %traight line motion +a, P-! Q-# "-1 %-( +b, P-# Q-! "-( %-1 (') P- Q- R-2 S- +d, P-( Q-# "-1 %-! A!"#$%& '
[GATE-200]
1#. /he lengths o the links o a (-bar linkage ith re2olute pairs onl& are pq r and s units p D q D r D s. 4hich o these links should be the i=ed one or obtaining a Edouble crankE [GATE-200] mechanismF +a, Link o length p +b, link o length q +c, Link o length r (d) 49!7 1 4$!: " A!"#$%& d
1(. Match List I ith List II and select the correct anser [IES-2002] List I +
A!"#$%& d
1). 6 round bar 6 passes through the c&lindrical hole in as shon in the gi2en igure. 4hich [IES-++5] one o the olloing statements is correct in this regardF +a, /he to links shon rom a kinematic pair. +b, /he pair is completel& constrained. (') T$ .9% ." 9!'84$$ '!"%.9!; +d, /he pair is successull& constrained. A!"#$%& '
1*. Consider the olloing statements 1. 6 round bar in a round hole orm a turning pair !. 6 square bar in a square hole orms a sliding pair #. 6 2ertical shat in a ootstep bearing orms a successul constraint. A these statements +a, 1 and ! are correct +b, 1 and # are correct +d, 1! and # are correct (') 2 .!d .%$ '%%$' A!"#$%& '
[IES-2000]
18. Match List I ith List II and select the correct anser using the codes gi2en belo the lists List I List II [IES-+++] 6. ( links ( turning pairs 1. Complete constraint . # links # turning pairs !. %uccessul constraint C. ) links ) turning pairs #. "igid rame :. Jootstep bearing (. Incomplete constraint 6 C : 6 C : +a, # 1 ( ! +b, 1 # ! ( (d) 2 +c, # 1 ! ( A!"#$%& d
10. Consider the olloing statements 1. /he degree o reedom or loer kinematic pair is ala&s equal to one. !. 6 ball-and-socket 3oint has # degrees o reedom and is a higher kinematic pair. #. Aldham;s coupling mechanism has to prismatic pairs and to re2olute pairs. 4hich o the statements gi2en abo2e is9are correctF
(.) ,2 .!d +b, 1 and # A!"#$%& .
+c,!# and (
+d,1!# and (
1. 4hich o the olloing are e=amples o orced closed kinematic pairsF 1. Cam and roller mechanism !. :oor closing mechanism #. %lider-crank mechanism (. 6utomoti2e clutch operating mechanism %elect the correct anser using the codes gi2en belo Codes (.) , 2 .!d +b, 1 and # +c, ! # and ( +d, 1 ! # and ( A!"#$%& .
[IES-200]
[IES-++6] !7. 6ssertion +6, H&draulic luid is one orm a link. "eason +", 6 link need not necessaril& be a rigid bod& but it must be a resistant bod&. (.) B A .!d R .%$ 9!d9?9d3.44@ %3$ .!d R 9" $ '%%$' $4.!.9! 1 A +b, oth 6 and " are indi2iduall& true but " is not the correct e=planation o 6 +c, 6 is true but " is alse +d, 6 is alse but " is true A!"#$%& .
