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1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q61 ⇒ The process opposite to 'dispersion' is termed as the flocculation [other wrong options] [Discuss in forum] sedimentation filtration none of these. |
Q62 ⇒ Which one is a filter aid ? Diatomaceous earth [other wrong options] [Discuss in forum] Convas fabric Calcined lime None of these |
Q63 ⇒ What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls ? 0.66 [other wrong options] [Discuss in forum] 0.5 1 2.76 |
Q64 ⇒ Ribbon blenders are exclusively meant for non-flowing powder and thin pastes. [other wrong options] [Discuss in forum] blending miscible liquids. bath mixing. continuous mixing. |
Q65 ⇒ The opening of a 200 mesh screen (Taylor series) is 0.0074 cm [other wrong options] [Discuss in forum] 0.0074 mm 0.0047 cm 74 mili-microns |
Q66 ⇒ As per Taggart's formula, the capacity (kg/hr) of Jaw & Gyratory crushers (for gapes of 10 to 60 cms) is equal to (where, L = Length of feed opening, cms S = Maximum width of discharge opening, cms ) 93 LS [other wrong options] [Discuss in forum] LS 250 LS LS |
Q67 ⇒ To produce talcum powder, use ball mill [other wrong options] [Discuss in forum] hammer mill jet mill pin mill |
Q68 ⇒ Which of the following achieves the least reduction ratio for a given feed size? Roll crusher [other wrong options] [Discuss in forum] Jaw crusher Cone crusher Gyratory crusher |
Q69 ⇒ The specific surface of sherical particles is proportional to (where, Dp = diameter of particle). 1/Dp [other wrong options] [Discuss in forum] D2p Dp 1/D2p |
Q70 ⇒ Which of the following conveyors cannot be recommended for transportation of abrasive materials ? Flight conveyor [other wrong options] [Discuss in forum] Belt conveyor Apron conveyor Chain conveyor |
Q71 ⇒ In case of grinding in a ball mill all (a), (b) and (c). [other wrong options] [Discuss in forum] wet grinding achieves a finer product size than dry grinding. its capacity decreases with increasing fineness of the products. grinding cost and power requirement increases with increasing fineness of the products. |
Q72 ⇒ During size reduction by a jaw crusher, the energy consumed decreases with the increasing size of feed at constant reduction ratio. [other wrong options] [Discuss in forum] decreasing size of product at constant size of feed. decreasing machine capacity. none of these. |
Q73 ⇒ Mass flow of granular solid (M) through a circular opening of dia, D follows M ∝ D3 [other wrong options] [Discuss in forum] M ∝ D M ∝ D2 M ∝ D |
Q74 ⇒ Energy consumption in a crusher decreases with increase in the all (a), (b) & (c). [other wrong options] [Discuss in forum] size of the product (at constant feed size). capacity of the crushing machine. size of feed (at constant reduction ratio). |
Q75 ⇒ Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ρ = bulk density of material, kg/m3) 3.6 W.D.V.ρ [other wrong options] [Discuss in forum] 3.6 W.D.V. 3.6 W.V.ρ 3.6 D.V.ρ |
Q76 ⇒ Sedimentation on commercial scale occurs in rotary drum filters [other wrong options] [Discuss in forum] classifiers thickeners cyclones |
Q77 ⇒ In froth floatation, chemical agent added to cause air adherence is called collector [other wrong options] [Discuss in forum] frother modifier activator |
Q78 ⇒ The mechanism of size reduction by a hammer mill is by impact and attrition between the both (a) and (b). [other wrong options] [Discuss in forum] grinding element & the housing. feed particles. neither (a) nor (b). |
Q79 ⇒ The grinding in a hammer crusher takes place due to the both (a) & (b) [other wrong options] [Discuss in forum] attrition impact neither (a) nor (b) |
Q80 ⇒ __________ baffles are provided in ball mills. Horizontal [other wrong options] [Discuss in forum] No Only two None of these |
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