If the spindle speed is 80 rpm and cross-feed is 0.3 mm/rev,then the time taken to face a work piece of 72 mm diameter will be ________.
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Solution
Small amount of carbonaceous material sprinkled on the inner surface of mould cavity is knownas:
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Solution
Small amount of carbonaceous material sprinkled on the inner surface of mould cavity is known as dry sand.
Austempering is employed to obtain:
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Solution
Austempering is a heat treatment process which is applied to ferrous materials. it produces bainite microstructure.
When a weight of 100 N falls on a spring of stiffness 1 kN/m from a height of 2 m, the deflection caused in the first fall is________.
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Solution
A thin cylinder of radiusr and thickness t when subjected to an internal hydrostatic pressure P causes a radial displacement u, thin the tangential strain caused will be:
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Solution
Tangential strain =2u⁄r
where, u = radial displacement
r = radius of cylinder
Match List-I with List-II
List-I List-II
A. Saddle key 1.strong in shear
B. Woodruff key 2.withstands tension in
one direction
C .Tangent key 3.transmission of power
through frictional resistance
D. Kennedy key 4.semi-circular in shape
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Solution
Saddle key = Transmission of power through frictional resistance.
Wood-ruff key =Semi-circular in shape
Tangent key = withstands tension in one direction.
Kennedy key = Strong in shear.
A cotter joint is used when no relative motion is permitted between the rods joined by the cotter. It is capable of transmitting:
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Solution
A cotter joint is used to connect rigidly two rods that are subjected to axial tensile or compressive forces so the cotter joint is capable of transmitting an axial tensile and compressive load.
A linkage is shown in figure in which links ABC and DEF are ternary links, whereas AF, BE and CD are binary links.
The degree of freedom of linkage when link ABC is fixed is:
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Solution
Common contact ratio of a pair of spur pinion and gear is:
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Solution
Contact ratio is described as maximum number of teeth are in contact at any instant. High contact ratio is responsible for smooth gear operation.
Contact ratio =\(\frac{Contact\, are}{Pitch}\)
Contact ratio of a pair of spur pinion and gear is in between 2 and 3.
Throttle governing in steam turbines,
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Solution
In throttle governing, the pressure of steam is decreased significantly at inlet of turbine.