Subtopic: Calculation of power, torque, fuel consumption, heat load and power losses
Question Statement:
A power operated chaff cutter with two knives is rotating at 600 rpm. It has a conveyor type feeding mechanism which operates at a speed of 0.6 m s⁻¹. The theoretical chaff length in mm is
Options:
(A) 20
(B) 30
(C) 60
(D) 90
Official Answer Key:
B
Step-by-Step Solution & Explanation
Theoretical chaff length = (feed speed)/(number of knives × rotational speed in rev/s).
Rotational speed = 600 rpm = 600/60 = 10 rev/s. Number of cuts per second = knives × rev/s = 2×10 = 20 cuts/s.
Chaff length = 0.6 m/s ÷ 20 cuts/s = 0.03 m = 30 mm. Matches option (B).
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