In a roll crusher, the specific power consumption and the production rate is affected by the (A) Reduction ratio (B) Differential roll speed (C) Both (A) and (B) (D) Neither (A) nor (B)

In a roll crusher, the specific power consumption and the production
rate is affected by the
(A) Reduction ratio
(B) Differential roll speed
(C) Both (A) and (B)
(D) Neither (A) nor (B)
by

1 Answer

Answer :

(C) Both (A) and (B)
by

Related questions

Horsepower required for a roll crusher is directly proportional to its (A) Reduction ratio (B) Capacity(C) Both (A) & (B)(D) Neither (A) nor (B)

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Last Answer : (C) Both (A) & (B)

Pick out the wrong statement pertaining to the roll crushers. (A) Maximum feed size determines the required roll diameter (B) For hard material's crushing, the reduction ratio should not exceed 4 (C) Both the rolls run necessarily at the same speed (D) Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced

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Last Answer : (C) Both the rolls run necessarily at the same speed

Which of the following achieves the least reduction ratio for a given feed size? (A) Jaw crusher (B) Roll crusher (C) Cone crusher (D) Gyratory crusher

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Last Answer : (B) Roll crusher

Energy consumption in a crusher decreases with increase in the (A) Size of the product (at constant feed size) (B) Capacity of the crushing machine (C) Size of feed (at constant reduction ratio) (D) All (A), (B) & (C)

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Last Answer : (D) All (A), (B) & (C)

Toothed roll crushers achieve size reduction by (A) Tearing (shear) and compression (B) Impact and attrition (C) Both (A) & (B) (D) Neither (A) nor (B)

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Last Answer : (C) Both (A) & (B)

Size reduction of ice and gypsum can be accomplished suitably by a __________ crusher. (A) Blake jaw (B) Toothed roll (C) Gyratory (D) None of these

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Last Answer : (B) Toothed roll

The grinding in a hammer crusher takes place due to the (A) Attrition (B) Impact (C) Both (A) & (B) (D) Neither (A) nor (B

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Last Answer : (B) Reduction ratio in crushing operation is defined as the ratio of minimum feed size to the maximum product size

During size reduction by a jaw crusher, the energy consumed decreases with the (A) Decreasing size of product at constant size of feed (B) Decreasing machine capacity (C) Increasing size of feed at constant reduction ratio (D) None of these

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Last Answer : (D) All (A), (B) and (C)

In a roll crusher, both the rolls (A) Have the same diameter (B) Are rotated towards each other (C) Run either at the same or different speeds (D) All (A), (B) and (C

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Last Answer : (D) All (A), (B) and (C

In___________ thereis alwaysa transition at the middle of the bit, but thebit values are determined at the beginningof the bit. If the nextbit is 0, there is a transition; if the next bit is 1, there is none. A) Manchester B) differential Manchester C) both (a) and (b) D) neither (a) nor (b)

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Last Answer : differential Manchester

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Last Answer : both (a) and (b)

The idea of RZ andthe ideaof NRZ-I are combined into the ________ scheme. A) Manchester B) differential Manchester C) both (a) and (b) D) neither (a) nor (b)

Description : The idea of RZ andthe ideaof NRZ-I are combined into the ________ scheme. A) Manchester B) differential Manchester C) both (a) and (b) D) neither (a) nor (b)

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The idea of RZ andthe ideaof NRZ-L are combined into the ________ scheme. A) Manchester B) differential Manchester C) both (a) and (b) D) neither (a) nor (b)

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Use of grinding aids results in the (A) Enhanced production rate (B) Finer products (C) Both (A) & (B) (D) Neither (A) nor (B)

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Half the angle of nip, (α), for a roll crusher is given by (where, dr, dp and df are diameters of crushing rolls, feed particles and rolls gap respectively). (A) cos α = (dr + dp)/(dr + df) (B) cos α = (dr + df)/(dr + dp) (C) tan α = (dr + dp)/(dr + df) (D) sin α = (dr + dp)/(dr + df)

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Which of the following is not an ultrafine grinder (colloid mill)?(A) Micronizers (B) Agitated mills and fluid energy mills (C) Toothed roll crusher (D) Hammer mills with internal classification

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Last Answer : (C) Toothed roll crusher

Limestone is normally crushed in a (A) Roll crusher (B) Hammer crusher (C) Ball mill (D) Tube mill

Description : Limestone is normally crushed in a (A) Roll crusher (B) Hammer crusher (C) Ball mill (D) Tube mill

Last Answer : (B) Hammer crusher

Coal is finally pulverised to 200 mesh size for burning in boilers by a (A) Hammer crusher(B) Ball mill(C) Roll crusher(D) Gyratory crusher

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Last Answer : (B) Ball mill

Which is a secondary crusher for a hard & tough stone? (A) Jaw crusher(B) Cone crusher(C) Impact crusher(D) Toothed roll crushe

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Last Answer : (C) Gyratory crusher

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Last Answer : (B) Squirrel-cage disintegrator

Which of the following is used for primary crushing of very hard lumpy materials? (A) Toothed roll crusher (B) Gyratory crusher

Description : Which of the following is used for primary crushing of very hard lumpy materials? (A) Toothed roll crusher (B) Gyratory crusher

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Which of the following is a fine crusher? (A) Blake jaw crusher (B) Gyratory crusher (C) Toothed roll crusher (D) Dodge jaw crusher

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Last Answer : (C) Toothed roll crusher

Cement clinker is reduced to fine size by a (A) Roll crusher (B) Ball mill (C) Tube mill (D) Hammer mill

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Last Answer : (C) Tube mill

Carbon black is pulverised in a (A) Hammer crusher (B) Ball mill (C) Roll crusher (D) Gyratory crusher

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Last Answer : (B) Ball mill

The mechanism of size reduction by a hammer mill is by impact and attrition between the (A) Grinding element & the housing (B) Feed particles (C) Both (A) and (B) (D) Neither (A) nor (B)

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Last Answer : (C) Both (A) and (B)

Size reduction of moulding powders, waxes, resins & gums are done in a __________ mill. (A) Cage (B) Hammer (C) Both (A) & (B) (D) Neither (A) nor (B)

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If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process'. The diffusivity under this condition is called 'Knudsen diffusivity', which is affected by the (A) Pressure (B) Temperature (C) Both (A) & (B) (D) Neither (A) nor (B)

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Marginal Propensity to Consume is (a) Increase in consumption due to one unit increase in income. (b) Total consumption divided by total income. © Both (a) and (b). (d) Neither (a) nor (b).

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Out of the following size reduction equipments, the maximum feed size can be accepted by the (A) Tube mill (B) Ball mill (C) Jaw crusher (D) Jet pulveriser

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Size reduction of fibrous materials like wood, asbestos, mica etc. is done by a disintegrator exemplified by the(A) Blake jaw crusher(B) Cage mill(C) Stamp mill(D) Bradford's breaker

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Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them. (A) Jaw crusher, Ball mill, Fluid energy mill(B) Ball mill, Jaw crusher, Fluid energy mill(C) Fluid energy mill, Jaw crusher, Ball mill(D) Fluid energy mill, Ball mill, Jaw crusher

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In case of a hammer crusher, the final product size depends on the (A) Feed rate (B) Rotor speed(C) Clearance between hammer & grinding plates(D) All (A), (B) and (C

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Last Answer : (C) Both (A) & (B)

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Last Answer : (a) neither syngamy nor reduction division

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How would the economy be affected if everyone holding stock neither bought nor sold shares for, say, a week?

Description : How would the economy be affected if everyone holding stock neither bought nor sold shares for, say, a week?

Last Answer : it would stay flat and sidewise. people would be going long term- then when it broke- there’d be lots of money to make

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