Question

As per BIS, for safe use of threshers

• A. The minimum length of feeding chute should be 90 cm and covered up to a minimum of 45 cm
• B. The maximum length of feeding chute should be 90 cm and covered up to a minimum of 45 cm
• C. The maximum length of feeding chute should be 90 cm and covered up to a maximum of 45 cm
• D. The minimum length of feeding chute should be 90 cm and covered up to a maximum of 45 cm

Hint:

Safety requirements always enforce "minimum" values for lengths and coverage to maximize protection.
Hence, choose options specifying "minimum" parameters for both limits.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
To prevent severe hand and arm injuries during manual crop feeding into power threshers, safety standards specify exact dimensional constraints for the feeding chute.

Step 3: Detailed Explanation:
According to the Bureau of Indian Standards (BIS) safety guidelines for power threshers (IS: 9020):
1. The feeding chute must be long enough to prevent the operator's hand from reaching the high-speed threshing cylinder.
2. The safety specifications state that the

minimum length of the feeding chute must be \(90\text{ cm}\) (\(900\text{ mm}\)).
3. Additionally, a top cover must be provided over the chute extending to a

minimum distance of 45 cm (\(450\text{ mm}\)) from the mouth of the chute to prevent accidental entry of hands.

Step 4: Final Answer:
The correct option is 1, which corresponds to "The minimum length of feeding chute should be 90 cm and covered up to a minimum of 45 cm".