Related Questions

Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity?
A Sphere
B Cube
C Cylinder (L/D = 1)
D Raschig rings
A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case,
A The cooling rate will be the same for the two spheres and hence the two spheres will have equal temperatures at any instant
B Both the spheres will emit equal amount of radiation per unit time in the beginning
C Both will absorb equal amount of radiation from the surrounding in the beginning
D Both B & C
For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is
A $$\frac{{{{\text{d}}_1}}}{{{{\text{d}}_1} + {{\text{d}}_2}}}$$
B $$\frac{{{{\text{d}}_2}}}{{{{\text{d}}_1} + {{\text{d}}_2}}}$$
C $$\frac{{{{\text{d}}_1} + {{\text{d}}_2}}}{{{{\text{d}}_1}}}$$
D $$\frac{{{{\text{d}}_1} + {{\text{d}}_2}}}{{{{\text{d}}_2}}}$$
A Thevenin ac equivalent circuit always consists of an equivalent ac voltage source and an equivalent capacitance.
A True
B False
Norton's theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent voltage source in series with an equivalent impedance.
A True
B False
Thevenin's theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent current source in parallel with an equivalent impedance.
A True
B False
A particle inside a hollow sphere of radius r, having coefficient of friction µ can rest up to height of
A $$\frac{{\text{r}}}{2}$$
B $$\frac{{\text{r}}}{{\text{A}}}$$
C $$\frac{{\text{r}}}{3}$$
D 0.134 r
A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ?
A Both the spheres will reach the ground simultaneously.
B A will reach the ground first.
C B will reach the ground first.
D The question is incomplete because the masses of the spheres are not given.
such matters are outside the sphere of my responsibility.The word sphere in this sentence can be replaced (without altering the meaning by:
A area
B domain
C range
D any of a, b or c
In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube)
A $$\frac{{4\left( {{{\text{p}}^2} - \pi {{\text{d}}^2}/4} \right)}}{{\pi {\text{d}}}}$$
B $$\frac{{{{\text{p}}^2} - \pi {{\text{d}}^2}/4}}{{\pi {\text{d}}}}$$
C $$\frac{{4{{\text{p}}^2}}}{{\pi {\text{d}}}}$$
D $$\frac{{\pi {\text{d}}}}{{4{{\text{p}}^2}}}$$

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