Engineering Questions with Answers - Multiple Choice Questions

# Mechanical Operations MCQ’s – Magnetic Separation

1 - Question

What does the below equation represents?

a) Filtration area
b) Velocity of filtration
c) Speed of filtration
d) Flow of filtrate

Explanation: The rate of filtration is represented by the above equation, where V is the volume of filtrate which has passed in time t and A is the area.

2 - Question

For any filtration pressure, the rate of flow is ______ at the beginning.
a) Constant
b) Greatest
c) Smallest
d) Critical

Explanation: For any filtration pressure, the rate of flow is greatest at the beginning of the process and this is because the resistance is minimum.

3 - Question

____ may cause plugging of pores.
a) High final rates
b) Low initial rates
c) High initial rates
d) Low final rates

Explanation: High initial rates of filtration may result in the initial layers can be appreciably influence the structure of the whole filter cake.

4 - Question

Increase of pressure drop forms ______
a) Vast volume
b) Deeper cake
c) Lighter cake
d) Denser cake

Explanation: With a compressible cake, increase of pressure difference or the rate of formation can form a denser cake.

5 - Question

What does the following equation gives?

(1-e)A lρs

a) Mass of solid in filter
b) Mass of cake
c) Mass of filter
d) Mass of fluid

Explanation: The variable l and V are connected, and the relation between then is given by the above equation, where ps is the density of solids.

6 - Question

Calculate the mass, if density of solid 1.20, e is 0.2 and has an area of 45 m2 and length 10 m?
a) 450 kg
b) 45 kg
c) 360 kg
d) 100 kg

Explanation: As (1 – 0.2)*45*10 = 360 kg.

7 - Question

What does the following equation gives?
(e) Alρs
a) Mass of solid in filter
b) Mass of liquid in filter
c) Mass of filter
d) Mass of fluid

Explanation: This equation is used in basic filtration equation and used to find the mass of liquid in filter and where A is area and l is the length.

8 - Question

Calculate the liquid in filter, if e is 2.0 and Area and length are 120 m2 and 2 m and consider water as fluid?
a) 250 kg
b) 240 kg
c) 480 kg
d) 260 kg

Explanation: As we know that the mass is given as 2.0*120*2 = 480 kg.

9 - Question

Particles will be compacted, if initial pressure is ____
a) High
b) Low
c) Constant
d) Open to atmosphere

Explanation: If the initial pressure is high, the first particles are caught and will be compacted into a tight mass that largely fills the pores.

10 - Question

The initial pressure of will form precipitate, if initial pressure is _____
a) High
b) Low
c) Constant
d) Open to atmosphere