Mock campus paper for mechanical 3
1) Rupture stress is
a) Breaking stress
b) Maximum load/original cross-sectional area(A)
c) Load at breaking point/A
d) Load at breaking point/neck area
e) Maximum stress
2) Flow stress corresponds to
a) Fluids in motion
b) Breaking point
c) Plastic deformation of solids
d) Rupture stress
e) None of the above
3) Resilience of a material is considered when it is subjected to
a) Frequent heat treatment
b) Fatigue
c) Creep
d) Shock loading
e) Resonant condition
4) The total strain energy stored in a body is termed as
a) Resilience
b) Proof resilience
c) Modulus of resilience
d) Toughness
e) Impact energy
5) The strain energy stored in a body due to suddenly applied load compared to when it is applied gradually is
a) Same
b) Twice
c) Four times
d) Eight times
e) Half
6) A beam is loaded as cantilever. If the load at the end is increased, the failure will occur
a) In the middle
b) At the tip below the load
c) At the support
d) Anywhere
e) None of the above
7) Moment of inertia of an area will be least w.r.t.
a) Horizontal axis
b) Vertical axis
c) Bottom most axis
d) Central axis
e) Point of suspension
58) If a material is loaded beyond yield point stress
a) It becomes elastic
b) It becomes ductile
c) Its resistance to failure increases
d) It loses its tendency to return to its original shape
9) If all the dimensions of a prismatic bar be increased in the ratio of k :1, then maximum stress produced in the bar due to its own weight will increase in the following ratio
a) k:1
b) k*k:1
c) k*k*k:1
d) 1:k
e) 1:k*k
10) The torsional rigidity of a shaft is expressed by the
a) Maximum torque it can transmit
b) Number of cycles it undergoes before failure
c) Elastic limit upto which it resists torsion, shear & bending stresses
d) Torque required to produce a twist of one radian per unit length of shaft
e) Maximum power it can transmit at highest possible speed.
11) Strain energy stored in a solid circular shaft is proportional to
a) GJ (torsional rigidity of shaft)
b) 1/GJ
c) GJ*GJ
d) 1/(GJ*GJ)
e) 1/sqrt(GJ)
12) Shear stress induced in a shaft subjected to tension will
be
a) Maximum at periphery & zero at centre
b) Maximum at centre
c) Uniform throughout
d) Average value in centre
e) None of the above
13) Which of the following is a lower joint
a) Ball & socket
b) Piston & cylinder
c) Cam & follower
d) a) & b) above
e) belt drive
14) The example of rolling pair is
a) Bolt and nut
b) Lead screw of a lathe
c) Ball & socket joint
d) Ball bearing & roller bearing
e) All the above
15) The Scott-Russell mechanism consists of
a) Sliding & turning pairs
b) Sliding & rotary pairs
c) Turning & rotary pairs
d) Sliding pairs only
e) Turning pairs only
16) Davis steering gear consists of
a) Sliding pairs
b) Turning pairs
c) Rolling pairs
d) Higher pairs
e) Lower pairs
17) Oldham’s coupling is the
a) Second inversion of double slider crank chain
b) Third conversion of double slider crank chain
c) Second conversion of single slider crank chain
d) Third conversion of single slider crank chain
e) Fourth conversion of double slider crank chain
18) Relationship between the number of links (L) &
number of pairs (P) is
a)P = 2 L – 4
b)P = 2 L + 4
c)P = 2 L + 2
d)P = 2 L -2
e)P = L - 4
19) In automobiles the power is transmitted from gear box to differential through
a) Bevel gear
b) Universal joint
c) Hooke’s joint
d) Knuckle joint
e) Oldham’s coupling.
20) Sprue in casting refers to
a) gate
b) runner
c) riser
d) horizontal passage
e) vertical passage
21) Which of the following casting methods utilizes wax patterns
a)Shell moulding
b)Plaster moulding
c)Slush casting
d)Investment casting
e)Semi-centrifugal casting
22) Pick up the incorrect statement about advantages of
vacuum die casting
a) It produces good quality castings
b) Porosity is reduced
c) Surface finish is improved
d) Less metal is used
e) Injection pressure is reduced
23) Ornamental objects, statues, toys etc. are cast by
a) Die casting
b) Pressed casting
c) Centrifugal casting
d) Slush casting
e) None of the above
24) Large and heavy castings are made by
a) Green sand moulding
b) Pit moulding
c) Dry sand moulding
d) Pressure moulding
e) Machine moulding
25) Sweep pattern is used for moulding parts having
a)Rectangular shape
b)Elliptical shape
c)Uniform symmetrical shape
d)Complicated shape having intricate details
e)None of the above
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