If x is the mean of data 3, x, 2 and 4, then the mode is
Q. If x is the mean of data 3, x, 2 and 4, then the mode is Ans: 3 Sol: Given data are 3, x, 2, and 4
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The most common limit gage used for inspecting the hole diameter is
Q. The most common limit gage used for inspecting the hole diameter is (A) Snap gage (B) Ring gage (C) Plug gage (D) Master gage Ans: Plug gage Sol: The most common limit gauge used for inspecting the hole diameter is Plug gauge.
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The cold forming process in which a hardened tool is pressed against a workpiece
Q. The cold forming process in which a hardened tool is pressed against a workpiece (when there is relative motion between the tool and the workpiece) to produce a roughened surface with a regular pattern is (A) Roll forming (B) Strip rolling (C) Knurling (D) Chamfering Ans: Knurling Sol: It is a process of
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The fluidity of molten metal of cast alloys (without any addition of fluxes) increases with increase in
Q. The fluidity of molten metal of cast alloys (without any addition of fluxes) increases with increase in (A) viscosity (B) surface tension (C) freezing range (D) degree of superheat Ans: degree of superheat
Hardenability of steel is a measure of
Q. Hardenability of steel is a measure of (A) the ability to harden when it is cold worked (B) the maximum hardness that can be obtained when it is austenitized and then quenched (C) the depth to which required hardening is obtained when it is austenitized and then quenched (D) the ability to retain its
Which one of the following modifications of the simple ideal Rankine cycle increases the thermal efficiency
Q. Which one of the following modifications of the simple ideal Rankine cycle increases the thermal efficiency and reduces the moisture content of the steam at the turbine outlet? (A) Increasing the boiler pressure. (B) Decreasing the boiler pressure. (C) Increasing the turbine inlet temperature. (D) Decreasing the condenser pressure. Ans: Increasing the turbine inlet
One-dimensional steady state heat conduction takes place through a solid whose cross-sectional area varies linearly in the direction of heat transfer
Q. One-dimensional steady state heat conduction takes place through a solid whose cross-sectional area varies linearly in the direction of heat transfer. Assume there is no heat generation in the solid and the thermal conductivity of the material is constant and independent of temperature. The temperature distribution in the solid is (A) Linear (B)
Sphere 1 with a diameter of 0.1 m is completely enclosed by another sphere 2 of diameter 0.4 m. The view factor F12 is
Q. Sphere 1 with a diameter of 0.1 m is completely enclosed by another sphere 2 of diameter 0.4 m. The view factor F12 is (A) 0.0625 (B) 0.25 (C) 0.5 (D) 1.0 Ans: 1.0 Sol: By summation rule F1-1 + F1-2 = 1 ∵ F1-1 = 0 because no radiation leaving the surface 1
A two-dimensional incompressible frictionless flow field is given by u = xˆi – yˆj . If r is the density of the fluid, the expression for pressure gradient
Q. A two-dimensional incompressible frictionless flow field is given by u = xˆi – yˆj . If r is the density of the fluid, the expression for pressure gradient vector at any point in the flow field is given as Ans: – ρ (xi + yj)
Endurance limit of a beam subjected to pure bending decreases with
Q. Endurance limit of a beam subjected to pure bending decreases with (A) decrease in the surface roughness and decrease in the size of the beam (B) increase in the surface roughness and decrease in the size of the beam (C) increase in the surface roughness and increase in the size of the beam (D)
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