Mechanical Operations - Practice Test

[#326] Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens.

(A) Jaw crusher

(B) Hammer crusher

(C) Ball mill

(D) Tube mill

Correct Answer

(B) Hammer crusher

[#327] increasing the capacity of a screen __________ the screen effectiveness.

(A) Decreases

(B) Increases

(C) Does not effect

(D) None of these

Correct Answer

(A) Decreases

[#328] Pick out the wrong statement pertaining to the turbine agitator.

(A) Recommended peripheral speed for the turbine agitator is 200 - 250 metres/minute

(B) Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow

(C) Generally, the diameter of the agitator is kept between $${frac{1}{3}^{{ ext{rd}}}}$$ to $${frac{1}{6}^{{ ext{th}}}}$$ of the tank diameter while the blade length is $${frac{1}{4}^{{ ext{th}}}}$$ of agitator diameter (with central disc, it is $${frac{1}{8}^{{ ext{th}}}}$$ of the agitator diameter)

(D) Turbine agitator should be located at a height not less than one agitator diameter length from the bottom. If the depth of liquid in the tank is more than twice the agitator diameter, two agitators should be used

Correct Answer

(B) Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow

[#329] A gravity decanter is meant for the separation of two __________ density.

(A) Immiscible liquids of different

(B) Miscible liquids of different

(C) Immiscible liquids of same

(D) Miscible liquids of same

Correct Answer

(A) Immiscible liquids of different

[#330] The reduction ratio for fine grinders is

(A) 5-10

(B) 10-20

(C) 20-40

(D) As high as 100

Correct Answer

(D) As high as 100

Mechanical Operations - Study Mode

[#326] Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens.

Correct Answer

[#327] increasing the capacity of a screen __________ the screen effectiveness.

Correct Answer

[#328] Pick out the wrong statement pertaining to the turbine agitator.

Correct Answer

[#329] A gravity decanter is meant for the separation of two __________ density.

Correct Answer

[#330] The reduction ratio for fine grinders is

Correct Answer