Mechanical Operations What is the selectivity index, if the grade of tailings & concentrate is the same? 0.5 ∞ 1 0.5 ∞ 1 ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher? Ball mill Rod mill Fluid energy mill Gyratory crusher Ball mill Rod mill Fluid energy mill Gyratory crusher ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Crushing efficiency of a machine ranges between __________ percent. 50 to 70 20 to 25 0.1 to 2 5 to 10 50 to 70 20 to 25 0.1 to 2 5 to 10 ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Which of the following comes in the category of primary crusher for hard and tough stone? Jaw crusher Gyratory crusher Cone crusher None of these Jaw crusher Gyratory crusher Cone crusher None of these ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls? 40° 16° 46° 32° 40° 16° 46° 32° ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations 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? 0.5 1 0.66 2.76 0.5 1 0.66 2.76 ANSWER DOWNLOAD EXAMIANS APP
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