131. Which of the following is the softest material?
132. Work index is defined as the
133. The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be __________ cms.
134. Which of the following is the hardest material?
135. Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor.
136. Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a __________ conveyor.
137. Sulphuric acid mist is arrested by using a __________ scrubber.
138. __________ conveyors are also called scrapers.
139. Coal is finally pulverised to 200 mesh size for burning in boilers by a
140. Filtration rate through a filter cake is proportional to (where, S = filtering surface, R = specific cake resistance, $$\mu $$ = viscosity of the filtrate)
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