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# Mechanical Operations MCQ’s – Magnetic Separation

What does the below equation represents?

a) Filtration area

b) Velocity of filtration

c) Speed of filtration

d) Flow of filtrate

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Answer: a

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.

For any filtration pressure, the rate of flow is ______ at the beginning.

a) Constant

b) Greatest

c) Smallest

d) Critical

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Answer: b

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.

____ may cause plugging of pores.

a) High final rates

b) Low initial rates

c) High initial rates

d) Low final rates

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Answer: c

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

Increase of pressure drop forms ______

a) Vast volume

b) Deeper cake

c) Lighter cake

d) Denser cake

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Answer: d

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

What does the following equation gives?

(1-e)A lρ_{s}

a) Mass of solid in filter

b) Mass of cake

c) Mass of filter

d) Mass of fluid

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Answer: a

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

Calculate the mass, if density of solid 1.20, e is 0.2 and has an area of 45 m_{2} and length 10 m?

a) 450 kg

b) 45 kg

c) 360 kg

d) 100 kg

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Answer: c

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

What does the following equation gives?

(e) Alρ_{s}

a) Mass of solid in filter

b) Mass of liquid in filter

c) Mass of filter

d) Mass of fluid

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Answer: b

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.

Calculate the liquid in filter, if e is 2.0 and Area and length are 120 m^{2} and 2 m and consider water as fluid?

a) 250 kg

b) 240 kg

c) 480 kg

d) 260 kg

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Answer: c

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

Particles will be compacted, if initial pressure is ____

a) High

b) Low

c) Constant

d) Open to atmosphere

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Answer: a

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.

The initial pressure of will form precipitate, if initial pressure is _____

a) High

b) Low

c) Constant

d) Open to atmosphere

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Answer: b

Explanation: If initial pressure is low, the initial layer of precipitate will be more open so that rates of filtration will be higher.