Mechanical Operations - Study Mode
[#61] Vibrating screens are used for handling large tonnages of materials. The vibrating motion is imparted to the screening surface by means of
Correct Answer
(D) Either A, B or C
[#62] Gizzlies are used for separating __________ solids.
Correct Answer
(A) Coarse
Explanation
Solution: Gizzlies are heavy-duty screens used in mechanical operations for separating large-sized solids from the feed material. They consist of parallel bars or rods spaced at specific intervals to allow only particles below a certain size to pass through. Typically, gizzlies are used at the initial stages of processing to remove large lumps or coarse materials before finer screening or crushing. Therefore, gizzlies are specifically designed to separate coarse solids .
[#63] For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a
Correct Answer
(A) Buhrstone mill
[#64] What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?
Correct Answer
(B) 32°
[#65] Sauter mean diameter is the same as the __________ mean diameter.
Correct Answer
(C) Volume-surface