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February 2019

Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the___________________?

Mechanical Operations /
Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the___________________?

A. Coagulation
B. Flocculation
C. Sedimentation
D. Clarification

Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the___________________? Read More »

Mechanical Operations

Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the____________________?

Mechanical Operations /
Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the____________________?

A. Density separation
B. Differential wettability
C. Size
D. Volatile matter content

Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the____________________? Read More »

Mechanical Operations

Critical speed of rotation, N (in rps – rotation per second) of a trammel is equal to (where, g = acceleration due to gravity = 9.81 m/sec2 and, r = radius of trammel, metre.) ?

Mechanical Operations /
Critical speed of rotation, N (in rps – rotation per second) of a trammel is equal to (where, g = acceleration due to gravity = 9.81 m/sec2 and, r = radius of trammel, metre.) ?

A. (1/2π). √(g/r)
B. (1/π). √(g/r)
C. ½ √(g/r)
D. 2π. √(g/r)

Critical speed of rotation, N (in rps – rotation per second) of a trammel is equal to (where, g = acceleration due to gravity = 9.81 m/sec2 and, r = radius of trammel, metre.) ? Read More »

Mechanical Operations

General crushing equation is given by d(P/m) = -K (dD̅ S/D̅ n S). Bond’s crushing law is obtained by solving this equation for n = _____________ and feed of infinite size?

Mechanical Operations /
General crushing equation is given by d(P/m) = -K (dD̅ S/D̅ n S). Bond’s crushing law is obtained by solving this equation for n = _____________ and feed of infinite size?

A. 1
B. 1.5
C. 2
D. 2.5

General crushing equation is given by d(P/m) = -K (dD̅ S/D̅ n S). Bond’s crushing law is obtained by solving this equation for n = _____________ and feed of infinite size? Read More »

Mechanical Operations