Question

The volume of tyre filled with water for ballasting purpose is:

• A. 25%
• B. 50%
• C. 75%
• D. 90%

Hint:

Think about how much air space has to stay inside the tube so the tyre can still cushion the ride.

Answer 1

The Correct Option is C

Step 1: Liquid ballasting means water, sometimes mixed with calcium chloride so it does not freeze, is put inside the tractor's rear tyre tubes through the valve stem. This raises the weight sitting on the drive wheels, which gives more grip and more pull without bolting extra weights onto the tractor.

Step 2: The tube is never filled all the way. Some air has to stay inside so the tyre can still flex over bumps and absorb shocks. If water filled the whole tube, the ride would turn hard and rough ground could split the tube because water does not compress.

Step 3: Standard practice in tractor operation is to fill the tube to about three fourths of its volume with water and leave the rest as an air pocket. Three fourths of the volume works out to 75%.

Step 4: Checking the choices: 25% and 50% add too little weight to matter for ballasting, and 90% leaves almost no air cushion, which risks damaging the tube. Only 75% gives a proper balance of added weight and a safe air pocket, so option 3 is correct.