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February 2019

Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids (> 50000 centipoise) ?

Mechanical Operations /
Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids (> 50000 centipoise) ?

A. Propeller
B. Helical screw
C. Flat blade turbine
D. Curved blade turbine

Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids (> 50000 centipoise) ? Read More »

Mechanical Operations

Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc) is proportional to ____________ and the cycle time (where, μ = filtrate viscosity Rm = filter medium resistance Rc = cake resistance)?

Mechanical Operations /
Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc) is proportional to ____________ and the cycle time (where, μ = filtrate viscosity Rm = filter medium resistance Rc = cake resistance)?

A. √μ
B. 1/√μ
C. 1/μ
D. 1/μ2

Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc) is proportional to ____________ and the cycle time (where, μ = filtrate viscosity Rm = filter medium resistance Rc = cake resistance)? Read More »

Mechanical Operations

Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines ?

Mechanical Operations /
Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines ?

A. Compartment mill
B. Rod mill
C. Pebble mill
D. Tube mill

Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines ? Read More »

Mechanical Operations

Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter) ?

Mechanical Operations /
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter) ?

A. 0.5 D
B. D
C. 1.5 D
D. 2 D

Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter) ? Read More »

Mechanical Operations

Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is ______________ microns?

Mechanical Operations /
Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is ______________ microns?

A. < 5
B. 10 to 25
C. < 74
D. > 1000

Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is ______________ microns? Read More »

Mechanical Operations