Subtopic: Mechanics and energy requirement in size reduction of agriculture produce
Question Statement:
Which of the following comminution machines operates primarily on the principle of combined impact and attrition for the fine grinding of cereal grains and spices?
Options:
(A) Hammer mill equipped with swinging beaters and a perforated peripheral screen
(B) Burr (attrition) plate mill with grooved stationary and rotating discs
(C) Smooth double-roll crusher with parallel counter-rotating cylinders
(D) Jaw crusher with reciprocating swinging jaw plate
Answer Key:
A
Step-by-Step Solution & Explanation
In a hammer mill, high-speed revolving hammers shatter grains through dynamic impact, and particles are further reduced by attrition (shear against the screen and other particles) until they become fine enough to pass through the peripheral screen openings.