Question

As per BIS, for safe use of threshers

(A) The minimum length of feeding chute should be 90 cm.
(B) The feeding chute should be covered up to a minimum length of 45 cm.
(C) The feeding chute should be inclined to the horizontal at an angle of 5-10 degree.
(D) The feeding chute should be made of stainless steel.
(E) The feeding chute should have an alarming system.

Choose the correct answer from the options given below:

• A. (A), (B) and (C) only.
• B. (B), (C) and (D) only.
• C. (B), (D) and (E) only.
• D. (A), (B) and (E) only.

Hint:

Focus on what actually protects an operator's hand: chute length, guarding, and a warning signal, not the material or the tilt angle.

Answer 1

The Correct Option is D

Step 1: The Bureau of Indian Standards safety code for power threshers is written to keep an operator's hands well away from the spinning cylinder while feeding crop material in.

Step 2: Statement (A) is correct. The feeding chute is required to have a minimum length of 90 cm, so a worker's hand, following the material in, stays a safe distance from the threshing cylinder.

Step 3: Statement (B) is correct. Part of that chute, at least 45 cm of it near the feeding end, must be covered or guarded, so fingers cannot slip down into the moving parts while pushing crop in.

Step 4: Statement (E) is correct. Threshers are required to carry an alarm system, typically an audible or visual signal, that activates when the machine is running, warning nearby workers that the cylinder is live and dangerous to approach.

Step 5: Statement (C), a specific incline angle of 5 to 10 degrees, is not part of the standard safety requirement, the chute's angle is a design detail, not a mandated safety dimension. Statement (D), demanding stainless steel construction, is also not required, ordinary mild steel with proper guarding satisfies the safety code just as well.

Step 6: So only (A), (B) and (E) are genuine BIS safety requirements, matching option 4.