Mechanical Operations - Section 1 (4)

Directions to Solve

Mechanical Operations - Section 1

You can find the problems related to mechanical operation and can
solve these problems to test your aptitude ability.

25.

Size reduction of __________ is accomplished in steam heated rollers and roll crushers.

A.	resins
B.	gums
C.	hard rubber
D.	waxes

Answer: Option C

Explanation:

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26.

Ball mills and tube mills with flint or porcelain balls are used for size reduction of

A.	asbestos
B.	rubber
C.	non-metallic ores
D.	limestone

Answer: Option C

Explanation:

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27.

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

A.	4
B.	1/4
C.	1
D.	1/2

Answer: Option B

Explanation:

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28.

For a non-spherical particle, the sphericity

A.	is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle.
B.	has the dimension of length.
C.	is always less than 1.
D.	is the ratio of volume of a sphere having the same surface area as the particle to the actual volume of the particle.

Answer: Option A

Explanation:

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29.

Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, V_p = volume of one particle, ρ= density of particles)

A.	m/ρ . Vp
B.	m . ρ/Vp
C.	m . Vp/ρ
D.	Vp/m . ρ

Answer: Option A

Explanation:

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30.

The distribution given by microscopic analysis of powder is

A.	number
B.	length
C.	area
D.	volume

Answer: Option A

Explanation:

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31.

Diatomaceous earth is a/an

A.	explosive
B.	filter aid
C.	filter medium
D.	catalyst

Answer: Option B

Explanation:

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32.

Solid particles separation based on the difference in their flow velocities through fluids is termed as the

A.	clarification
B.	classification
C.	elutriation
D.	sedimentation

Answer: Option B

Explanation:

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