faculty of diploma studies 695

Faculty of Diploma Studies – 695 Department of Mechanical Engineering - 19

DME (3351902) Prepared By K. C. Lathiya

MCQ with Answer

Subject: Design of Machine Elements Semester: 5th Sem.

Prepared by: K. C. Lathiya Course: Diploma

M.E. (CAD/CAM)

Unit.no-1: Introduction

1) Which of the following material has the maximum ductility?

(a) Mild steel

(b) Copper

(c) Zinc

(d) Aluminium

2) 2. According to Indian standard specifications, a grey cast iron designated by ‘FG

200’ means that the

(a) carbon content is 2%

(b) maximum compressive strength is 200 N/mm2

(c) minimum tensile strength is 200 N/mm2

(d) maximum shear strength is 200 N/mm2

3) Steel containing upto 0.15% carbon is known as

(a) mild steel

(b) dead mild steel

(c) medium carbon steel

(d) high carbon steel

4) According to Indian standard specifications, a plain carbon steel designated by

40C8 means that

(a) carbon content is 0.04 per cent and manganese is 0.08 per cent

(b) carbon content is 0.4 per cent and manganese is 0.8 per cent

(c) carbon content is 0.35 to 0.45 per cent and manganese is 0.60

to 0.90 per cent

(d) carbon content is 0.60 to 0.80 per cent and manganese is 0.8 to

1.2 per cent

5) The material commonly used for crane hooks is.

(a) cast iron

(b) wrought iron

(c) mild steel

(d) aluminium



6) A steel with 0.8 per cent carbon is known as.

(a) eutectoid steel

(b) hypereutectoid steel

(c) hypoeutectoid steel

(d) none of these

7) 1Mpa = _____N/mm2

(a) 1

(b) 10

(c) 100

(d) 1000

8) Unit of Load is_____

(a) N

(b) N/mm2

(c) Mpa

(d) Pa*s

9) Unit of Stress_____

(a) N

(b) N/mm2

(c) kg/m3

(d) Pa*s

10) Unit of Torque_____

(a) N*mm

(b) N/mm2

(c) Mpa

(d) Pa*s

11) Unit of Bending Moment _____

(a) N*mm

(b) N/mm2

(c) Mpa

(d) Pa*s

12) Which Design Methods required Maximum Experience & Research..

(a) Developed Design

(b) Adeptive Design

(c) New Design

(d) All of the Above



13) The material commonly used for machine tool bodies is

(a) mild steel

(b) aluminium

(c) brass

(d) cast iron

14) Unit of Bending Modulus Elasticity(E) _____

(a) N*mm

(b) N/mm2

(c) KN

(d) Pa*s

15) Unit of Modulus of rigidity (G) _____

(a) N*mm

(b) N/mm2

(c) KN

(d) Pa*s

16) The permanent mode of deformation of a material known as _____________

a) Elasticity

b) Plasticity

c) Slip deformation

d) Twinning deformation

17) The ability of a material to be formed by hammering or rolling is known as

_________

a) Malleability

b) Ductility

c) Harness

d) Brittleness

18) The ability of a metal which helps it to form a smooth cast is known as ______

a) Machinability

b) Formability

c) Solderability

d) Castability

19) Which property helps a material to absorb lubricants?

a) Density

b) Porosity

c) Soldering

d) Absorptivity



20) Plain carbon steels are alloys mainly consisting of _________

a) Iron and Carbon

b) Potassium and Iron

c) Carbon and Potassium

d) Carbon and Indium

21) Which of the following parameters can be obtained by tension test of a standard

specimen?

a) Proportional Limit

b) Yield Strength

c) Percentage Reduction in area

d) All of the mentioned

22) Which of the following is measure of stiffness?

a) Modulus of elasticity

b) Modulus of plasticity

c) Resilience

d) Toughness

23) Which of the following are true for toughness

a) Ability of material to absorb energy before fracture

b) Measured by Izod & Charpy test

c) Decreases with the increase in temperature


24) Hardness is

a) Surface property

b) Resistance to abrasion

c) Depends upon resistance to plastic deformation of the material


25) Type of load affects factor of safety.

a) True

b) False

26) A mechanical component may fail as a result of which of the following

a) elastic deflection

b) general yielding

c) fracture

d) each of the mentioned

27) Type of load affects factor of safety.

a) True

b) False



28) For cast iron components, which of the following strength are considered to

be the failure criterion?

a) Ultimate tensile strength

b) Yield Strength

c) Endurance limit

d) None of the mentioned

29) For components made of ductile materials like steel, subjected to static

loading which of the following strength is used as a failure of criterion?

a) Yield strength

b) Ultimate strength

c) Endurance limit


30) Pitting occurs on _____ of the component.

a) Surface

b) Inner body

c) Inside or on surface

31) Stress concentration is defined as the localization of high stresses due to

irregularities present in the component and no changes of the cross section.

a) True

b) False

32) For an elliptical hole on a flat plate, if width of the hole in direction of the

load decrease, Stress Concentration Factor will______

a) Increase

b) Decrease

c) Remains constant

d) Can’t be determined. Varies from material to material

33) In which of the following case stress concentration factor is ignored?

a) Ductile material under static load

b) Ductile material under fluctuating load

c) Brittle material under static load

d) Brittle material under fluctuating load

34) Which of the following reduces the stress concentration?

a) Use of multiple notches

b) Drilling additional holes

c) Removal of undesired material

d) Each of the mentioned



35) The phenomenon of decreased resistance of the materials to fluctuating

stresses is the main characteristic of _____ failure.

a) Fracture

b) Fatigue

c) Yielding


36) Fatigue failure is time dependent failure.

a) True

b) False

Unit-2 Design of machine elements subjected to Direct Stress.

37) The taper on cotter varies from

a. 1 in 15 to 1 in 10

b. 1 in 24 to 1 in 20

c. 1 in 32 to 1 in 24

d. 1 in 48 to 1 in 24

38) In a steam engine, the piston rod is usually connected to the crosshead by

means of a

a. knuckle joint

b. universal joint

c. flange coupling

d. cotter joint

39) In a steam engine, the valve rod is connected to an eccentric by means of a

a. knuckle joint

b. universal joint

c. flange coupling

d. cotter joint

40) A cotter joint is used to transmit

a. axial tensile load only

b. axial compressive load only

c. combined axial and twisting loads

d. axial tensile or compressive loads

41) Hooke’s law holds good upto

a. yield point

b. elastic limit

c. plastic limit



d. breaking point

42) The ratio of linear stress to linear strain is called

a. Modulus of elasticity

b. Modulus of rigidity

c. Bulk modulus

d. Poisson's ratio

43) The modulus of elasticity for mild steel is approximately equal to

a. 80 kN/mm2

b. 110 kN/mm2

c. 100 kN/mm2

d. 210 kN/mm2

44) When the material is loaded within elastic limit, then the stress is ......... to

strain.

a. equal

b. directly proportional

c. inversely proportional

45) The ratio of the ultimate stress to the design stress is known as

a. elastic limit

b. strain

c. factor of safety

d. bulk modulus

46) The Poisson’s ratio for steel varies from

a. 0.21 to 0.25

b. 0.25 to 0.33

c. 0.33 to 0.38

d. 0.38 to 0.45

47) The energy stored in a body when strained within elastic limit is known as

a. resilience

b. proof resilience

c. strain energy

d. impact energy

48) A rivet is specified by

a. shank diameter

b. length of rivet

c. type of head

d. length of tail



49) According to Unwin’s formula, the relation between diameter of rivet hole (d)

and thickness of plate (t) is given by

a. d = t

b. d = 1.6

c. d = 2 t

d. d = 6 √t

where d and t are in mm.

50) A line joining the centres of rivets and parallel to the edge of the plate is

known as

a. back pitch

b. marginal pitch

c. gauge line

d. pitch line

51) The centre to centre distance between two consecutive rivets in a row, is

called

a. margin

b. pitch

c. back pitch

d. diagonal pitch

52) A lap joint is always in ..... shear.

a. single

b. double

53) A double strap butt joint (with equal straps) is

a. always in single shear

b. always in double shear

c. either in single shear or double shear

d. any one of these

54) According to Indian standards, the diameter of rivet hole for a 24 mm

diameter of rivet, should be

a. 23 mm

b. 24 mm

c. 25 mm

d. 26 mm

55) The diameter of the rivet hole is usually ............ the nominal diameter of the

rivet.

a. equal to

b. less than



c. more than

56) The largest diameter of an external or internal screw thread is known as

a. minor diameter

b. major diameter

c. pitch diameter

d. none of these

57) The pitch diameter is the ...................... diameter of an external or internal

screw thread.

a. effective

b. smallest

c. largest

58) A screw is specified by its

a. major diameter

b. minor diameter

c. pitch diameter

d. pitch

59) The railway carriage coupling have

(a) square threads

(b) acme threads

(c) knuckle threads

(d) buttress threads

60) The square threads are usually found on

(a) spindles of bench vices

(b) railway carriage couplings

(c) feed mechanism of machine tools

(d) screw cutting lathes

61) A locking device in which the bottom cylindrical portion is recessed to

receive the tip of the locking set screw, is called

(a) castle nut

(b) jam nut

(c) ring nut

(d) screw nut

62) Which one is not a positive locking device ?

(a) Spring washer

(b) Cotter pin

(c) Tongued washer

(d) Spring wire lock



63) The washer is generally specified by its

(a) outer diameter

(b) hole diameter

(c) thickness

(d) mean diameter

64) A locking device extensively used in automobile industry is a

(a) jam nut

(b) castle nut

(c) screw nut

(d) ring nut

65) A bolt of M 24 × 2 means that

(a) the pitch of the thread is 24 mm and depth is 2 mm

(b) the cross-sectional area of the threads is 24 mm

(c) the nominal diameter of bolt is 24 mm and the pitch is 2 mm

(d) the effective diameter of the bolt is 24 mm and there are two threads per cm

66) When a nut is tightened by placing a washer below it, the bolt will be subjected to

(a) tensile stress

(b) compressive stress

(c) shear stress

(d) none of these

67) The eye bolts are used for

(a) transmission of power

(b) locking devices

(c) lifting and transporting heavy machines

(d) absorbing shocks and vibrations

68) The shock absorbing capacity of a bolt may be increased by

(a) increasing its shank diameter

(b) decreasing its shank diameter

(c) tightening the bolt properly

(d) making the shank diameter equal to the core diameter of the thread.

69) The resilience of a bolt may be increased by

(a) increasing its shank diameter

(b) increasing its length

(c) decreasing its shank diameter

(d) decreasing its length

70) A bolt of uniform strength can be developed by



(a) keeping the core diameter of threads equal to the diameter of

unthreaded portion of the bolt

(b) keeping the core diameter of threads smaller than the diameter of

unthreaded portion of the bolt

(c) keeping the nominal diameter of threads equal to the diameter of

unthreaded portion of bolt

(d) none of the above

Unit-3: Design of Machine elements Subjected to bending Stress

71) The neutral axis of a beam is subjected to

a. zero stress

b. maximum tensile stress

c. maximum compressive stress

d. maximum shear stress

72) At the neutral axis of a beam, the shear stress is

a. zero

b. maximum

c. minimum

73) In levers, the leverage is the ratio of

a. load lifted to the effort applied

b. mechanical advantage to the velocity ratio

c. load arm to the effort arm

d. effort arm to the load arm

74) In the levers of first type, the mechanical advantage is................ one.

(a) less than

(b) equal to

(c) more than

75) The bell crank levers used in railway signalling arrangement are of

(a) first type of levers

(b) second type of levers

(c) third type of levers

76) The rocker arm in internal combustion engines are of ................... type of levers.

(a) first

(b) second

(c) third



77) The cross-section of the arm of a bell crank lever is

(a) rectangular

(b) elliptical

(c) I-section

(d) any one of these

78) All the types of levers are subjected to

(a) twisting moment

(b) bending moment

(c) direct axial load

(d) combined twisting and bending moment

79) The method of manufacturing usually adopted for levers is

(a) casting

(b) fabrication

(c) forging

(d) machining

80) An I-section is more suitable for a

(a) rocker arm

(b) cranked lever

(c) foot lever

(d) lever of lever safety valve

81) The design of the pin of a rocker arm of an I.C. Engine is based on

(a) tensile, creep and bearing failure

(b) creep, bearing and shearing failure

(c) bearing, shearing and bending failure

(d) none of these

82) In designing a rocker arm for operating the exhaust valve, the ratio of the length to

the diameter of the fulcrum and roller pin is taken as

(a) 1.25

(b) 1.5

(c) 1.75

(d) 2

83)A leaf spring in automobiles is used

b. to apply forces

c. to measure forces

d. to absorb shocks

e. to store strain energy



84) In leaf springs, the longest leaf is known as

a. lower leaf

b. master leaf

c. upper leaf

d. none of these

Unit-4 Design of machine elements subjected to Direct &

Twistting Moments.

85) The taper on a rectangular sunk key is

a. 1 in 16

b. 1 in 32

c. 1 in 48

d. 1 in 100

86) The usual proportion for the width of key is

a. d/8

b. d/6

c. d/4

d. d/2 where d = Diameter of shaft.

87) When a pulley or other mating piece is required to slide along the shaft, a

................ sunk key is used.

a. rectangular

b. square

c. parallel

88) A key made from a cylindrical disc having segmental cross-section, is known as

a. feather key

b. gib head key

c. woodruff key

d. flat saddle key

89) A feather key is generally

a. loose in shaft and tight in hub

b. tight in shaft and loose in hub

c. tight in both shaft and hub

d. loose in both shaft and hub.

90) The type of stresses developed in the key is/are

(a) shear stress alone

(b) bearing stress alone



(c) both shear and bearing stresses

(d) shearing, bearing and bending stresses

91) For a square key made of mild steel, the shear and crushing strengths are related as

(a) shear strength = crushing strength

(b) shear strength > crushing strength

(c) shear strength < crushing strength

(d) none of the above

92) A keyway lowers

(a) the strength of the shaft

(b) the rigidity of the shaft

(c) both the strength and rigidity of the shaft

(d) the ductility of the material of the shaft

93) The sleeve or muff coupling is designed as a

(a) thin cylinder

(b) thick cylinder

(c) solid shaft

(d) hollow shaft

94) Oldham coupling is used to connect two shafts

(a) which are perfectly aligned

(b) which are not in exact alignment

(c) which have lateral misalignment

(d) whose axes intersect at a small angle

95) A transmission shaft subjected to bending loads must be designed on the basis of

(a) maximum normal stress theory

(b) maximum shear stress theory

(c) maximum normal stress and maximum shear stress theories

(d) fatigue strength

96) The maximum shear stress theory is used for

(a) brittle materials

(b) ductile materials

(c) plastic materials

(d) non-ferrous materials

97) The maximum normal stress theory is used for

(a) brittle materials

(b) ductile materials

(c) plastic materials

(d) non-ferrous materials



98) Which of the following loading is considered for the design of axles?

(a) Bending moment only

(b) Twisting moment only

(c) Combined bending moment and torsion

(d) Combined action of bending moment, twisting moment and axial

thrust

99) Two shafts will have equal strength, if

(a) diameter of both the shafts is same

(b) angle of twist of both the shafts is same

(c) material of both the shafts is same

(d) twisting moment of both the shafts is same

100) The standard length of the shaft is

(a) 5m

(b) 6m

(c) 7m

(d) All of the above

101) A spring used to absorb shocks and vibrations is

(a) closely-coiled helical spring

(b) open-coiled helical spring

(c) conical spring

(d) torsion spring

102) The spring mostly used in gramophones is

(a) helical spring

(b) conical spring

(c) laminated spring

(d) flat spiral spring

103) Which of the following spring is used in a mechanical wrist watch?

(a) Helical compression spring

(b) Spiral spring

(c) Torsion spring

(d) Bellevile spring

104) When a helical compression spring is subjected to an axial compressive load, the

stress induced in the wire is

(a) tensile stress

(b) compressive stress

(c) shear stress

(d) bending stress



105) ____ is used for a shaft that supports rotating elements like wheels, drums or rope

sleaves.

a) Spindle

b) Axle

c) Shaf

d) None of the listed

106) Is it necessary for an axle to be ______ with respect to rotating element?

a) Stationary

b) Moving

c) Moving or stationary


107) Counter shaft is a secondary shaft.

a) True

b) False

108) Shafts are subjected to ______ forces.

a) Compressive

b) Tensile

c) Shear


109) Which of the following act on shafts?

a) Torsional moment

b) Bending Moment

c) Both torsional and bending


110) When the shaft is subjected to pure bending moment, the bending stress is given

by?

a) None of the listed

b) 32M/πdᵌ

c) 16M/πdᵌ

d) 8M/πdᵌ

111) When the shaft is subjected to pure torsional moment, the torsional stress is given

by?


b) 32M/πdᵌ

c) 16M/πdᵌ

d) 8M/πdᵌ



112) The stiffness of solid shaft is more than the stiffness of hollow shaft with same

weight.

a) True

b) False

113) The strength of hollow shaft is more than the strength of solid shaft of same

weight.

a) True

b) False

114) Solid shaft is costlier than hollow shaft of same weight.

a) True

b) False

115) Flexible shafts have ___ rigidity in torsion making them flexible.

a) Low

b) High

c) Very high

d) Infinitely small

116) Flexible shafts have ______ rigidity in bending moment.

a) High

b) Low

c) Very high

d) Extremely low

117) A sunk key fits in the keyway of the _____ only.

a) Hub

b) Sleeve

c) Both hub and sleeve

d) Neither hub nor sleeve

118) Hollow saddle key is superior to flat saddle key as far as power transmitting

capability is concerned.

a) True

b) False

119) Saddle key is more suitable than sunk key for heavy duty applications.

a) True

b) False

120) The main advantage of sunk key is that it is a _____ drive.

a) Positive

b) Negative



c) Neutral


121) Woodruff key permits _____ movement b/w shaft and the hub.

a) Axial

b) Radial

c) Eccentric


122) Splines are keys.

a) True

b) False

123) Oldham coupling i used to connect two shafts having intersecting axes.

a) True

b) False

124) Clamp coupling employ bolts.

a) True

b) False

125) Entire torque is transmitted by friction in the clamp coupling.

a) True

b) False

126) Does shaft has to be shifted i axial direction to remove clamp coupling.

a) Yes

b) No

127) If shaft diameter is 40mm, calculate the diameter of sleeves in clamp coupling.

a) 100mm

b) 80mm

c) 60mm

d) 40mm Explanation: Dia=2.5d

128) If shaft diameter is 40mm, calculate the length of sleeves in clamp coupling.

a) 80mm

b) 140mm

c) 100mm

d) 120mm Explanation: L=3.5d

129) If shaft diameter is 60mm, how many bolts are recommended for rigid flange

coupling?

a) 2

b) 3



c) 4

d) 5

130) The hub is treated as a solid shaft while calculating torsional shear stress in the

hub.

a) True

b) False

131) Which of the following function can the spring perform?

a) Store energy

b) Absorb shock

c) Measure force


132) The helix angle is very small about 2⁰. The spring is open coiled spring.

a) Yes

b) It is closed coiled spring

c) That small angle isn’t possible


133) The longest leaf in a leaf spring is called centre leaf.

a) It is called middle leaf

b) It is called master leaf

c) Yes


134) The spring index is the ratio of wire diameter to mean coil diameter.

a) True

b) False

135) If the spring is compressed completely and the adjacent coils touch each other,

the length of spring is called as?

a) Solid length

b) Compressed length

c) Free length


136) If number of coils are 8 and wire diameter of spring 3mm, then solid length is

given by?


b) 27mm

c) 24mm

d) 21mm



137) Compressed length is smaller than the solid length.

a) True

b) False

138) Pitch of coil is defined as axial distance in compressed state of the coil.

a) Yes

b) It is measured in uncompressed state

c) It is same in uncompressed or compressed state


139) Active and inactive, both types of coils support the load although both don’t

participate in spring action.

a) Active coils don’t support the load

b) Inactive coils don’t support the load

c) Both active and inactive don’t support the load

d) Both active and inactive support the load

Unit-5 Design of machine elements subjected to Direct & Bending Stresses.

140) If core diameter of bolt is 13.8cm the it’s nominal diameter is given by?

a) 17.27mm

b) 15.34mm

c) 14.67mm

d) 16.34mm

141) For questions 142-148.

i) The following data is given for bracket

ii) P=20kN, e=100mm, S(yt)=400N/mm², FS=

b)

https://www.sanfoundry.com/wp-content/uploads/2017/06/machine-design-test-q1.png



142) Find the direct shear stress in bolts if diameter =18mm

a) 16.9N/mm²

b) 19.6 N/mm²

c) 78.6 N/mm²

d) 76.8 N/mm² Explanation: Direct shear stress=one fourth of P/A

143) If distance between the bolts from the axis of tilting is 125mm and 25mm, then

find the effective tensile force acting on the bolts lying at 125mm from tilting axis.

a) 6765.2N

b) 8798.2N

c) 7692.3N

d) 7962.11N Explanation: Tensile force=Pe x 125/2(125²+25²).

144) If distance between the bolts from the axis of tilting is 125mm and 25mm, then

find the effective tensile force acting on the bolts lying at 25mm from tilting axis.


b) 7692.3N

c) 2345.2N

d) 1538.46N Explanation: Tensile force=Pe x 25/2(125²+25²)

145) Which bolt can be used as criteria for designing?

a) Left top bolt

b) Both top bolts

c) Left bottom bolt

d) Both bottom bolt Explanation: The bolts farthest from the tilting axis are

under the maximum tensile force.

146) Find the principal shear stress in the top bolts in terms of area A?


b) 5309.2/A

c) 6308.2/A

d) 6980.4/A Explanation: Shear Stress in one bolt=5000/A and tensile

stress in upper bolt=7692.3/A. τ(max)=√[(σ/2)²+ τ²]

147) Find the size of the bolt using maximum shear stress theory.

a) 11mm

b) 12mm

c) 13mm

d) 14mm Explanation: 400 x 0.5/3 =6308.2 x 4 /πd²

148) Find the size of the bolt using maximum principal stress theory.


b) 19.2mm



c) 15.3mm

d) 21.2mm Explanation: σ(max)=σ/2 + √[(σ/2)²+ τ²]=10154.35/A = 35N/mm².

Unit-6 Pressure vessel Design.

140) A pressure vessel is said to be a thin cylindrical shell, if the ratio of the wall

thickness of the shell to its diameter is

(a) equal to 1/10

(b) less than 1/10

(c) more than 1/10

(d) none of these

141) In case of pressure vessels having open ends, the fluid pressure induces

(a) longitudinal stress

(b) circumferential stress

(c) shear stress

(d) none of these

142) The longitudinal stress is ...... of the circumferential stress.

(a) one-half

(b) two-third

(c) three-fourth

143) In case of thick cylinders, the tangential stress across the thickness of cylinder is

(a) maximum at the outer surface and minimum at the inner surface

(b) maximum at the inner surface and minimum at the outer surface

(c) maximum at the inner surface and zero at the outer surface

(d) maximum at the outer surface and zero at the inner surface

144) The design of the pressure vessel is based on

(a) longitudinal stress

(b) hoop stress

(c) longitudinal and hoop stress

(d) none of these

145) In a thick cylindrical shell, the maximum radial stress at the outer surfaces of the shell is

(a) zero

(b) p

(c) – p

(d) 2p



146) For high pressure oil and gas cylinders, the thickness of the cylinder is determined

by

(a) Lame’s equation

(b) Clavarino’s equation

(c) Barlow’s equation

(d) Birnie’s equation

147) Which of the following stress can also be known as hoop stress?

a) Axial stress

b) Longitudinal stress

c) Fluid stress

d) Circumferential stress

Unit-7 Selection of Procedure for Bearing.

148) In a full journal bearing, the angle of contact of the bearing with the journal is

a) 120°

b) 180°

c) 270°

d) 360°

149) A sliding bearing which can support steady loads without any relative motion

between the journal and the bearing is called

(a) zero film bearing

(b) boundary lubricated bearing

(c) hydrodynamic lubricated bearing

(d) hydrostatic lubricated bearing

150) In a boundary lubricated bearing, there is a ................ of lubricant between the

journal and the bearing.

(a) thick film

(b) thin film

151) When a shaft rotates in anticlockwise direction at slow speed in a bearing, then it

will

(a) have contact at the lowest point of bearing

(b) move towards right of the bearing making metal to metal contact

(c) move towards left of the bearing making metal to metal contact

(d) move towards right of the bearing making no metal to metal contact

152) The property of a bearing material which has the ability to accommodate small

particles of dust, grit etc., without scoring the material of the journal, is called



(a) bondability

(b) embeddability

(c) comformability

(d) fatigue strength

153) Teflon is used for bearings because of

(a) low coefficient of friction

(b) better heat dissipation

(c) smaller space consideration

(d) all of these

154) When the bearing is subjected to large fluctuations of load and heavy impacts, the

bearing characteristic number should be ............... the bearing modulus.

(a) 5 times

(b) 10 times

(c) 15 times

(d) 20 times

155) When the length of the journal is equal to the diameter of the journal, then the

bearing is said to be a

(a) short bearing

(b) long bearing

(c) medium bearing

(d) square bearing

156) In thrust bearings, the load acts

(a) along the axis of rotation

(b) parallel to the axis of rotation

(c) perpendicular to the axis of rotation

(d) in any direction

157) The rolling contact bearings are known as

a) thick lubricated bearings

b) plastic bearings

c) thin lubricated bearings

d) antifriction bearings

158) The bearings of medium series have capacity .......... over the light series.

a) 10 to 20%

b) 20 to 30%

c) 30 to 40%

d) 40 to 50%



159) The bearings of heavy series have capacity .......... over the medium series.

a) 10 to 20%

b) 20 to 30%

c) 30 to 40%

d) 40 to 50%

160) The ball bearings are usually made from

a) low carbon steel

b) medium carbon steel

c) high speed steel

d) chrome nickel steel

161) The tapered roller bearings can take

a) radial load only

b) axial load only

c) both radial and axial loads

d) none of the above

162) The piston pin bearings in heavy duty diesel engines are

a) needle roller bearings

b) tapered roller bearings

c) spherical roller bearings

d) cylindrical roller bearings

163) Which of the following is antifriction bearing?

a) journal bearing

b) pedestal bearing

c) collar bearing

d) needle bearing

164) Ball and roller bearings in comparison to sliding bearings have

a) more accuracy in alignment

b) small overall dimensions

c) low starting and running friction

d) all of these

165) A bearing is designated by the number 405. It means that a bearing is of

a) light series with bore of 5 mm

b) medium series with bore of 15 mm

c) heavy series with bore of 25 mm

d) light series with width of 20 mm

166) The listed life of a rolling bearing, in a catalogue, is the

a) minimum expected life



b) maximum expected life

c) average life

d) none of these

faculty of diploma studies 695

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