Mechanical Engineering - Workshop Technology - Discussion

D is the correct answer.

The correct answer is clay-type binder.

In foundry sand, a binder is used to hold the sand grains together to form a mould. In oil sand, a clay-type binder is commonly used. Clay-type binders are:

- Water-based
- Inexpensive
- Easy to use
- Provide good strength and durability

Clay-type binders are typically a mixture of clay, water, and other additives. They are widely used in foundry sand because they:

- Provide good binding properties
- Are relatively inexpensive
- Are easy to mix and apply
- Can be used with a variety of sand types

The other options are incorrect because:
- Organic-type binder: Typically used in resin-bonded sand, not oil sand.
- Inorganic-type binder: Not commonly used in oil sand, as it may not provide the necessary binding properties.
- Any one of these: While there are different types of binders, clay-type binders is the most commonly used in oil sand.

The choice of binder depends on the specific application, sand type, and desired properties of the mould.