Mechanical Operations MCQs

Question 1

The ratio of the actual mesh dimension of Taylor series to that of the next smaller screen is

Accepted Answer

$$\sqrt 2 $$

Answer

2

Answer

1.5

Answer

$$\sqrt 3 $$

Question 2

__________ conveyors are also called scrapers.

Accepted Answer

Both B & C

Answer

Apron

Answer

Screw

Answer

Helical flight

Question 3

Which of the following relationships between co-efficinet of friction (μ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct ?

Accepted Answer

Μ ≥ tan α

Answer

Μ > tan α

Answer

Μ > tan 2α

Answer

Μ ≤ tan α

Question 4

Traces of solids are removed from, liquid in a

Accepted Answer

Clarifier

Answer

Classifier

Answer

Sparkler filter

Answer

Rotary vacuum filter

Question 5

The most common filter aid is

Accepted Answer

Diatomaceous earth

Answer

Calcium silicate

Answer

Sodium carbonate

Answer

Silica gel

Question 6

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

Accepted Answer

$$\sqrt 2 $$

Answer

1.5

Answer

1

Answer

None of these

Question 7

Energy requirement (per unit mass of material crushed/ground) is highest for

Accepted Answer

Fluid energy mill

Answer

Jaw crusher

Answer

Rod mill

Answer

Ball mill

Question 8

In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is

Accepted Answer

$$\frac{1}{4}$$

Answer

4

Answer

1

Answer

$$\frac{1}{2}$$

Question 9

In a roll crusher, both the rolls

Accepted Answer

All of the above

Answer

Have the same diameter

Answer

Are rotated towards each other

Answer

Run either at the same or different speeds