Mechanical Engineering
ME 8593 | Design of Machine Elements Mcq
1.The basic series of preferred numbers are
a) R5,R10,R20, & R80
2.The increase in local stresses at points of rapid change in crosssection or discontinuities is called
a) strength
b) toughness
c) stress concentration
d) stress distribution
3.Hooke's law holds good upto
a) breaking point b) yield point c) elastic limit d) plastic limit
4.Stress varying from zero to a maximum value of same nature is
a) repeated stress b) reversed stress c) fluctuating stress d) alternating stress
5.The property of the material to absorb energy and to resist shock and impact loads
a) creep b) toughness c) hardness d) resilience
6.The degree to which the theoretical effect of stress concentration is actually reached is
a) sensitivity b) notch sensitivity c) factor of safety d) endurance limit
7.Ratio of shear stress to shear strain is called
a) bulk modulus b) poisson ratio c) modulus of rigidity d) modulus of elasticity
8.Speed at which the shaft runs which makes the axis of shaft to be infinite is known as
a) maximum speed b) critical speed c) minimum speed d) optimum speed
9. ------------are used to convert rotary motion into reciprocating motion
a) piston b) shafts c) crankshafts d) fuels
10.Material used for making hub or flange or muff in couplings is
a) mild steel b) nickel c) steel d) cast iron
11.------------is defined as the distance from a point on one thread to the corresponding on the adjacent
thread in the same axis plane
a) pitch b) addendum c) crest d) peak
12.For plates of thickness less than 6mm,the ends of overlapping plates can be directly welded at the edges called
a) lap joint b) butt joint c) edge joint d) tee joint
13.The ratio of mean diameter to the coil to wire diameter
a) stiffness b) spring indes c) waahls factor d) free length
14.-------------is that the helical compression spring behaves like a column and bends at a comparative
small load when the length of the spring is more than 4times the mean coil diameter
a) buckling b) surging c) nipping d) camber
15.What are the methods of reducing stress concentration
a) Avoiding sharp corners and giving sharp edges
b) providing fillets and undercuting shoulders
c) increasing load and reducing fatique
d) increasing thickness and area
16.Hardness is the ability of material to
a) resist scratching and indentation
b) resist deformation under loading
c) absorb energy
d) draw into a wire
17.Coulomb ,Tresca and Guest’s theory of failure is applicable to
a) ductile materials b) elastic materials c) brittle materials d) plastic materials
18.When a part is subjected to a constant stress at hig htemperature for a long period of time, it will
undergoas low and permanent deformation called
a) fatique b) testing of strength c) toughness d) creep
19.Maximizing a desired quantity and minimizing an undesired one is called
a) peaking b) optimization c) improvisation d) design
20.In a curved beam of symmetrical section where will be the maximum stress
a) inner fibre b) outer fibre c) centroidal axis d) neutral axis
21.------------theory states that failure occurs when the maximum strain in the member equals the tensile yield strain
a) St venant b) rankine c) gerber d) von - mises henky
22.------------are used to convert rotary motion into reciprocating motion
a) piston b) shaft c) crankshaft d) fuels
23.Material used for making hub or flange or muff in couplings is
a) mild steel b) nickel c) steel d) cast iron
24.Which of the following screw thread is stronger than other threads?
a) Square threads b) trapezoidal threads c) buttress threads d) V threads
25.Speed at which the shaft runs which makes the axis of shaft to be infinite is known as
a) maximum speed b) critical speed c) minimum speed d) optimum speed
26.Cold working
a) increases fatique strength b) has no influence on fatique strength c) decreases fatique strength d) none
27.------is a piece having same thickness ,and provides a larger bearing surface for the cotter to slide
on ,due to the increased holding power
a) screw b) gib c) nut d) cotter
28.In order to find the endurance limit, the rotating beam specimen is subjected to
a)repeated stress b) reversed stress c) fluctuating stress d) maximum stress
29.The ratio of mean diameter to the coil to wire diameter
a) stiffness b) spring indes c) waahls factor d) free length
30.A ------- spring consists of flat bars of varying lengths clamped together and supported at both ends,
thus acting as a simply supported beam.
a) helical b) conical c) leaf d) belleville
31. -------- is defined as the ratio of absolute viscosity to the density of oil
a) kinematic viscosity b) viscosity c) density d) thickness
32.If the length of journal is equal to its diameter it is called as ------ journal bearing
a) rectangular b) circular c) short d) square
33.A flat bar 32mm wide and 12mm thick is loaded by a steady tensile load of 85kN. The material is mild steel with yield
point stress of 315N per sqmm. Find the factor of safety based on the yield point
a) 2 b) 1.42 c) 2.3 d) 1.76
34.The property of a material by virtue of which it can be beaten rolled into plates is called.
a) malleability b) ductility c) elasticity d) relibility
35.Which material cannot be used to manufacture shafts?
a) plain carbon steels b) cast iron c) both a and b d) none
36.Which type of key consists of two square tapered keys placed 90o apart?
a) tangent key b) kennedy key c) saddle key d) woodruffkey
37.In S-N diagram, the graph plotted between fatigue strength and number of stress cycles becomes horizontal for which
type of materials?
a) ferrous materials b) non-ferrous materials c) both a and b d) none
38.Two shafts A and B are made of the same material .The diameter of shaft A is twice as that of shaft B.The power
transmitted by the shaft A will be__________of shaft B.
a) twice b) four times c) 6times d) 8times
39.Which is correct statement ?
a) A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast
iron
b) A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel
c) both will be equally rigid
d) all the above
40.Couplings are used
a) To transmit power between misalignment of shafts
b) to protect against overload
c) to connect two shafts in order to get long shafts
d) all the above
41.Which of the following statements is/are false for an axle?
a) It is used to support rotating machine elements
b) it can transmit torque
c) it is subjected to axial force
d) all the above
42.Which of the following threads have greater pitch and lead angle for a given nominal diameter when compared with
each other?
a) Coarse threads b) fine threads c) both a and b d) none
43.Which type of stress is induced in a screw thread?
a) torsional shear stress b) buckling load c) bearing pressure d) all of the above
44.What does the designation M 16x2 indicate?
a) I.S.O Metric fine thread
b) I.S.O Metric coarse thread
c) B.S.F Metric coarse thread
d) B.S.F Metric fine thread
45.Which type of screw fasteners are threaded through out its length?
a) cap screws b) set screws c) studs d) tap bolt
46.Which type of joint is used if plate thickness is less than 5mm?
a) single v butt weld
b) single u butt weld
c) square butt weld
d) double u butt weld \
47.Calculate weld throat thickness for the parallel fillet weld shown below, if allowable shear stress is 80MPa and tensile
load of 300kN is acting on it
a) 2.6 mm b) 9.56 mm c) 9.86 mm d) 8.36 mm
48.Which among the following is a knuckle joint
a) tension link in bridge structure b) foundation bolt c) both a and b d) none
49.Calculate weld size if weld throat thickness for the fillet weld is 8.2mm
a) 10 mm b) 14.20 mm c) 16.4 mm d) 12mm
50.When helical compression spring is subjected to axial compressive force, the type of stress induced in the spring wire
is
a) tensile stress b) compressive stress c) bending stress d) shear stress
51.The maximum shear stress in spring wire is induced at
a) inner surface of the coil b) outer surface of the coil c) central surface of the coil d) end coil
52.Two springs of stiffness k1 and k2 are connected in parallel, the combined stiffness of the connection is given by,
a) k1 k1 / k1 + k1
b) k1 k1 / k1 - k1
c) k1+k1
d) k1+k1/ k1 k1
53.If the wire diameter of a closely coiled helical spring subjected to compressive load is increased from 1cm to2cm,
other parameters remaining same,the deflection will decrease by a factor
a) 16 b) 8 c) 4 d) 2
54.When helical spring is cut into two equal halves ,stiffness of each of the resulting spring will be,
a) unaltered b) double c) one half d) one forth
55.The coefficient of fluctuation of speed of fly wheel is,
a) ratio of maximum and minimum speeds during the cycle
b) ratio of maximum fluctuating speed to the mean speed
c) ratio of mean speed to maximum fluctuation of speed during the cycle
d) sum of maximum fluctuation speed and mean speed
56.The cross section of the fly wheel arm (orspokes) is,
a) I section b) rectangular c) elliptical d) circular
57.A flywheel of moment of inertia 9.8kg m2 fluctuates by 30rpm for a fluctuation of energy of 1936joules.The mean
speed of the fly wheel (inrpm) is
a) 600 b) 900 c) 968 d) 2940
58.The ratio of length of stroke to cylinder bore (l/D) in IC engines is usually
a) 1/2 b) 5 c) 1.5 d) 1/4
59.The bolts for the cap of big end of connecting rod are subjected to
a) only gas force b) only inertia force c) only side force d) all the above
60.In case of partial bearing ,the angle of contact of the bushing with the journal is
a) 270* b) 180* c) less than 180* d) 360*
61.Boundary lubricated bearing is
a) thick film bearing b) thin film bearing c) hydrodynamic bearing d) hydrostatic bearing
62.The property of bearing material to allow foreign particle to get absorbed on the surface of the lining is called
a) embeddability b) conformability c) viscosity d) endurance limit stress
63.In Petroff’s equation, it is assumed that the lubricant film is
a) converging b) diverging c) uniform d) converging diverging
64.Starting friction is low in
a) hydrostatic lubrication b) hydrodynamic lubrication c) mixed semi fluid lubrication d) boundary lubrication
65.In radial bearings ,the load acts
a) along the axis of rotation b) perpendicular to the axis of rotation c) paralled to the axis of rotation d) inclined to the axis of rotation
66.A bearing number XX10 indicates that the bearing is having
a) bore diameter of 10mm b) bore diamter of 100mm c) bore diamter of 50mm d) outer diameter of 100mm
67.Stress induced in the balls or rollers of rolling contact bearing is
a) torsional shear stress b) tensile stress c) crushing stress d) contact stress
68.The catalogue life of the bearing is
a) minimum life that 90% of the bearing will reach or exceed
b) maximum life for 90% of the bearings
c) average life
d) median life
69.The medium series bearing have …...... higher load carrying capacity than light series bearing of the same bore
diameter
a) 30 to 40% b) 20 to 30% c) 40 to 50% d) 10 to 20%
Also read : OR 0551 Renewable energy sources mcq
ME 8595 Thermal Engineering 2 mcq
ME 8594 Dynamics of machines mcq
ME 8501 Metrology and measurements mcq
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