Mechanical Operations - Section 1 (2)

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.

9.

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

A.	metalliferrous ores
B.	non-metallic ores
C.	basic slags
D.	asbestos & mica

Answer: Option A

Explanation:

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10.

The value of 'angle of nip' is generally about

A.	16°
B.	32°
C.	52°
D.	64°

Answer: Option B

Explanation:

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11.

Highly viscous liquids & pastes are agitated by

A.	propellers
B.	turbine agitators
C.	multiple blade paddles
D.	none of these

Answer: Option C

Explanation:

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12.

Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is

A.	0.01 to 0.1
B.	0.1 to 0.3
C.	0.2 to 0.8
D.	0.2 to 0.4

Answer: Option C

Explanation:

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13.

Pick out the correct statement:

A.	Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products.
B.	The operating cost of shaking screen is more than that of a vibrating screen.
C.	Screen capacity does not depend upon the specific gravity of the minerals.
D.	Asphalt is best crushed using toothed roll crusher.

Answer: Option A

Explanation:

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14.

Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm) ?

A.	Trough washer
B.	Baum jig washer
C.	Spiral separator
D.	Froth floatation

Answer: Option D

Explanation:

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15.

The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 μrn is

A.	6.35 kWh/ton
B.	9.0 kWh/ton
C.	18 kWh/ton
D.	25.4 kWh/ton

Answer: Option C

Explanation:

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16.

Froth floatation is the most suitable for treating

A.	iron ores
B.	sulphide ores
C.	quartzite
D.	none of these

Answer: Option B

Explanation:

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