### SSC JE EXAM 2017(1 march morning shift) part - 2

51 - When two mutually perpendicular principal stresses are unequal but alike, the maximum shear stress is represented by _
Options:
1) The diameter of the Mohr's circle
2) Half the diameter of the Mohr's circle
3) One-third the diameter of the Mohr's circle
4) One-fourth the diameter of the Mohr's circle
Correct Answer: Half the diameter of the Mohr's circle

52 - The amplitude of underdamping a small damping varies with time as _
Options:
1) Linearly
2) Arithmetically
3) Geometrically
4) Exponentially

53 - Whirling speed of a shaft coincide with the natural frequency of the _
Options:
1) Longitudinal vibration
2) Transverse vibration
3) Torsional vibration
4) Coupled between torsional vibration

54 - A mass of 1 kg is attached to the end of a spring with stiffness 0.7 N/mm. The critical damping coefficient of this system is _
Options:
1) 1.40 Ns/m
2) 18.522 Ns/m
3) 52.92 Ns/m
4) 529.20 Ns/m

55 - Hydraulic grade line for any flow system as compared to energy line is_
Options:
1) Above
2) Below
3) At same level
4) Uncertain

56 - To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than _
Options:
1) 2.4 m above the hydraulic gradient
2) 6.4m above the hydraulic gradient
3) 10.0 m above the hydraulic gradient
4) 5.0 m above the hydraulic gradient

57 - The locus of elevations that water will rise in a series of pitot tube is called _
Options:

58 - Pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to _
Options:
1) 1 Pa
2) 98.1 Pa
3) 981 Pa
4) 9810 Pa

59 - Rankine's theory of failure is applicable for which of the following type of materials?
Options:
1) Brittle
2) Ductile
3) Elastic
4) Plastic

60 - The shock absorbing capacity of a bolt can be increased by _
Options:
1) Tightening it properly
2) Increasing shank diameter
3) Grinding the shank
4) Using washer

61 - Which if the following key is under compression rather than in being shear when under load?
Options:
2) Barth
3) Feather
4) Kennedy

62 - The plane of maximum shear stress has normal stress that is _
Options:
1) Maximum
2) Minimum
3) Zero
4) None of these

63 - Consider the following theories of failure:
A. Maximum stress theory
B. Maximum strain theory
C. Maximum shear stress theory
D. Maximum energy or distortion theory
The most suitable for ductile material i
Options:
1) A and B
2) A and C
3) A and D
4) C and D

64 - For ductile materials, the most appropriate failure theory is _
Options:
1) Maximum shear stress theory
2) Maximum principal stress theory
3) Maximum principal strain theory
4) Shear strain energy theory
Correct Answer: Maximum shear stress theory

65 - All the failure theories give nearly the same result _
Options:
1) When one of the principal stresses at a point is larger in comparison to the other
2) When shear stresses act
3) When both the principal stresses are numerically equal
4) For all situations of stress
Correct Answer: When one of the principal stresses at a point is larger in comparison to the other

66 - From the hypothesis given by Rankine, the criteria for failure of brittle material is _
Options:
1) Maximum principal stress
2) Maximum strain energy
3) Maximum shear stress
4) Maximum shear strain energy

67 - Surge wave is an example of _
Options:

68 - Quick return mechanism is an inversion of _
Options:
1) Four bar chain
2) Single slider crank chain
3) Double slider crank chain
4) Crossed slider crank chain
Correct Answer: Single slider crank chain

69 - In gears, interference takes place when _
Options:
1) Tip of a tooth of a mating gear digs into the portion between base and root circles
2) Gears do not move smoothly in the absence of lubrication
3) Pitch of the gear is not same
4) Gear teeth are undercut
Correct Answer: Tip of a tooth of a mating gear digs into the portion between base and root circles

70 - In a multiple V belt drive, when a single belt is damaged, it is preferable to change the complete set to _
Options:
1) Reduce vibration
2) Reduce slip
4) Ensure proper alignment

71 - The centre of gravity of the coupler link in a 4-bar mechanism would experience _
Options:
1) No acceleration
2) Only linear acceleration
3) Only angular acceleration
4) Both linear and angular accelerations
Correct Answer: Both linear and angular accelerations

72 - In a closed helical spring subjected to an axial load, other quantities remaining the same, if the wire diameter is doubled and mean radius of the coil is also doubled, then stiffness of spring when compared to original one will become _
Options:
1) Twice
2) Four times
3) Eight times
4) Sixteen times

73 - The Poisson's ratio for most of the materials is close to _
Options:
1) 1 : 2
2) 1 : 3
3) 1 : 4
4) 1 : 5

74 - True stress represents the ratio of_
Options:
1) Average load and average area
2) Average load and maximum area
3) Maximum load and maximum area
4) Instantaneous load and instantaneous area

75 - For an element under the effect of biaxial state of normal stress, the normal stresses are on a 45 ° plane is equal to _
Options:
1) Difference of normal stresses
2) Sum of normal stresses
3) Half of the sum of normal stresses
4) Half of the difference of normal stresses
Correct Answer: Half of the sum of normal stresses

76 - For a thin spherical shell subjected to internal pressure, the ratio of volumetric strain to diametrical strain is _
Options:
1) 5 : 4
2) 3 : 2
3) 2 : 1
4) 3 : 1

77 - If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge
Options:
1) same quantity of liquid
2) 0.75Q
3) Q/0.75
4) 1.5Q
Correct Answer: same quantity of liquid

78 - A 20 cm diameter pipe 5000 metres long conveys 0.05 cumec of water which is to be pumped through a height of 6 metres. What is the horse power required by the pump, if its efficiency is 75 % ?(take 4f = 0.006)
Options:
1) 74.2 HP
2) 74 HP
3) 75 HP
4) 50 HP

79 - For laminar flow in a pipe, V is equal to _
Options:
1) Umax
2) 0.5 Umax
3) 0.25 Umax
4) 2 Umax

80 - Water at 20° C flowing through a 20 cm diameter pipe. Take kinematic viscosity of water at 20°C is equal to 0.0101 stoke. Assume that the changes from laminar to turbulent at Re = 2320. The critical velocity will be _
Options:
1) 1.117 cm/sec
2) 11.17 cm/sec
3) 111.7 cm/sec
4) 1.117 m/sec

81 - Shaft is subjected to which of the following stresses?
Options:
1) Bending
2) Torsional
3) Both bending and torsional
4) None of these
Correct Answer: Both bending and torsional

82 - Which of the following is self-aligning bearing?
Options:
1) Conical
2) Spherical
3) Rectangular
4) None of these

83 - Which of the following is Trapezoidal thread?
Options:
1) Acme
2) Square
3) Buttress
4) All options are correct

84 - The efficiency of self-locking screw is _
Options:
1) More than 50%
2) Less than 50%
3) Equal to 50%
4) None of these

85 - Stud and projection welding belong to the following category of welding _
Options:
1) gas welding
2) arc welding
3) resistance welding
4) pressure welding

86 - Electrode gets consumed in the following welding process _
Options:
1) gas
2) resistance
3) thermit
4) arc

87 - The strength of a properly welded joint as compared to base metal would be _
Options:
1) same
2) more
3) less
4) unpredictable

88 - Oxygen to acetylene ratio in case of carburising flame is _
Options:
1) 0.5 : 1
2) 0.9 : 1
3) 1 : 1
4) 1 : 1.2

89 - For steel castings, the following type of sand is better _
Options:
1) fine-grain
2) coarser-grain
3) medium grain
4) fine-grain, coarser-grain and medium grain all are equally good

90 - The most suitable bearing for carrying very heavy loads with slow speed is _
Options:
1) Hydrodynamic bearing
2) Ball bearing
3) Roller bearing
4) Hydrostatic bearing

91 - The outside diameter of a hollow shaft is twice it's inside diameter. The ratio of its torque carrying capacity to that of a solid shaft of the same material and the same outside diameter is _
Options:
1) 15/16
2) 3/4
3) 1/2
4) 1/16

92 - A solid shaft can resist a bending moment of 3 kNm and a twisting moment of 4 kNm together, then the maximum torque that can be applied is _
Options:
1) 7.0 kNm
2) 3.5 kNm
3) 4.5 kNm
4) 5.0 kNm

93 - Under torsion, brittle materials generally fail _
Options:
1) Along a plane perpendicular to its longitudinal axis
2) In the direction of minimum tension
3) Along surfaces forming a 45° angle with the longitudinal axis
4) Not in any specific manner
Correct Answer: Along surfaces forming a 45° angle with the longitudinal axis

94 - The shear stress distribution over a rectangular cross-section of a beam follows _
Options:
1) A straight line path
2) A circular path
3) A parabolic path
4) An elliptical path

95 - Hot tear refers to _
Options:
1) casting defect
2) process of fabrication
3) process of heat treatment
4) weathering of non-ferrous materials

96 - Slick in a foundry shop is used to_
Options:
1) make and repair corners in a mould
2) thoroughly mix up moulding sand
3) make venting holes in the mould
4) prepare gates
Correct Answer: make and repair corners in a mould

97 - Which of the following processes would produce best components?
Options:
1) die casting
2) hot rolling
3) extrusion
4) forging

98 - A sprue hole is _
Options:
1) a casting defect
2) a hold made for riveting
3) a blind hole in jigs
4) an opening in mould for pouring molten metal
Correct Answer: an opening in mould for pouring molten metal

99 - Coining is the operation of _
Options:
1) cold forging
2) hot forging
3) cold extrusion
4) piercing