In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to
d
1.25 d
1.5 d
1.75 d
Correct Answer :
C. 1.5 d
Related Questions
A screw is said to be a self locking screw, if its efficiency is
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More than 50 %
Equal to 50 %
None of these
Shear stress theory is applicable for
Ductile materials
Brittle materials
Elastic materials
All of the above
The pipe joint mostly used for pipes carrying water at low pressures is
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Nipple joint
Union joint
Spigot and socket joint
The size of a gear is usually specified by
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Pitch circle diameter
Circular pitch
Diametral pitch
In most machine members, the damping capacity of the material should be
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Zero
High
Could be anything
In the assembly of pulley, key and shaft
Pulley is made the weakest
Key is made the weakest
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All the three are designed for equal strength
A steel containing upto 0.15% carbon is known as
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Dead mild steel
Medium carbon steel
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Oil in journal bearing should be applied at the point where load is
Nil or lightest
Maximum
Average
Any one of the above
The property of a material which enables it to resist fracture due to high impact loads is known as
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Strength
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In a horizontal flat belt drive, it is customary to use
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Idler pulley
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The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)
Gd⁴/ 8D3n
Gd3/ 8D3n
Gd⁴/ 4D3n
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A column of length l is fixed at both ends. The equivalent length of the column is
l/2
l/√2
l
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According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by
Equating tearing resistance of the plate to the shearing resistance of the rivets
Equating tearing resistance of the plate to the crushing resistance of the rivets
Equating shearing resistance to the crushing resistance of the rivets
None of the above
The sleeve or muff coupling is designed as a
Dun cylinder
Hollow shaft
Solid shaft
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The included angle between the sides of V-belt is
40°
45°
38°
60°
A key made from a cylindrical disc having segmental cross-section, is known as
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Feather key
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The application of third type levers is found in
Handle of a hand pump
Hand wheel of a punching press
Lever of a loaded safety valve
A pair of tongs
The shear stress in a beam varies from zero at the outer fibres to a maximum at the________.
Neutral surface
Upper surface
Lower surface
None of these
The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where T₁, and T₂ = Tensions on the tight and slack sides of belt respectively, μ = Coefficient of friction, between the belt and pulley, and θ = Angle of contact)
T₁/T₂ = μθ
log (T₁/T₂) = μθ
T₁/T₂ =eμθ
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Yield stress
Fluctuating stress
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Ductile materials
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One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
A slot is cut partly in middle of nut and then slot reduced by tightening a screw
A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end
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Measure forces
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All of these
Turn buckle has
Right hand threads on bout ends
Left hand threads on both ends
Left hand threads on one end and right hand threads on other end
No threads
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Increases the power transmitted
Increase the wrap angle
Increases the belt tension without increasing power transmission
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Flat spiral spring
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Shear stress
Circumferential stress
None of these
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3 Pc
Pc
Pc/3
2 Pc Where, Pc = tension in belt due to centrifugal force
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Bushed pin type coupling
Universal coupling
Oldham coupling
All of these
A spring of stiffness 1000 N/m is stretched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is
5 N-m
7 N-m
10 N-m
15 N-m