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February 2019

The ratio of the area of openings in one screen (Taylor series) to that of the openings in the next smaller screen is_________________?

Mechanical Operations /
The ratio of the area of openings in one screen (Taylor series) to that of the openings in the next smaller screen is_________________?

A. 1.5
B. 1
C. √2
D. None of these

The ratio of the area of openings in one screen (Taylor series) to that of the openings in the next smaller screen is_________________? Read More »

Mechanical Operations

Velocity of a small particle of diameter ‘Dp’ at a distance ‘r’ from the rotational axis of a cyclone rotating at an angular speed ‘ω’ is given by (the other symbols are as per standard notation) ?

Mechanical Operations /
Velocity of a small particle of diameter ‘Dp’ at a distance ‘r’ from the rotational axis of a cyclone rotating at an angular speed ‘ω’ is given by (the other symbols are as per standard notation) ?

A. [(DP/18). (ρs – ρ/μ)] ω2r
B. [(DP2/18). (ρs – ρ/μ)] ω2r
C. [(DP/18). (ρs – ρ/μ)] ω2r2
D. [(DP2/18). (ρs – ρ/μ)] ω2r

Velocity of a small particle of diameter ‘Dp’ at a distance ‘r’ from the rotational axis of a cyclone rotating at an angular speed ‘ω’ is given by (the other symbols are as per standard notation) ? Read More »

Mechanical Operations

For a non-spherical particle, the sphericity__________________?

Mechanical Operations /
For a non-spherical particle, the sphericity__________________?

A. Is defined as the ratio of surface area of a sphere having the same volume as the particle to the
actual surface area of the particle
B. Has the dimension of length
C. Is always less than 1
D. Is the ratio of volume of a sphere having the same surface area as the particle to the actual
volume of the particle

For a non-spherical particle, the sphericity__________________? Read More »

Mechanical Operations