Mechanical Operations MCQs

Question 1

__________ is a cohesive solid.

Accepted Answer

Wet clay

Answer

Wheat

Answer

Sand

Answer

None of these

Question 2

Pick out the wrong statement pertaining to the turbine agitator.

Accepted Answer

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

Answer

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

Answer

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)

Answer

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

Question 3

Trommels are revolving screens which normally operate in the range of __________ rpm.

Accepted Answer

15 - 20

Answer

1 - 2

Answer

40 - 50

Answer

60 - 75

Question 4

Trommels employ __________ for screening of materials.

Accepted Answer

Punched plate

Answer

Fibrous cloth

Answer

Woven wire screen

Answer

None of these

Question 5

The filter medium resistance is controlled by

Accepted Answer

Both pressure drop and flow rate

Answer

Pressure drop alone

Answer

Flow rate alone

Answer

Cake thickness

Question 6

Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.

Accepted Answer

Metalliferrous ores

Answer

Non-metallic ores

Answer

Basic slags

Answer

Asbestos & mica

Question 7

Hot, lumpy & abrasive materials are best transported by using a/an __________ conveyor.

Accepted Answer

Apron

Answer

Belt

Answer

Screw

Answer

Flight

Question 8

Which of the follwoing mechanical conveyors does not come under the division 'scrapers'?

Accepted Answer

Bucket elevators

Answer

Ribbon conveyor

Answer

Flight conveyor

Answer

Drag conveyor

Question 9

Which of the following is not a cutting machine?

Accepted Answer

Tube mills

Answer

Dicers

Answer

Knife cutters

Answer

Slitters