Slip Casting Questions and Answers

Answer: C

Doubling the thickness needs four times the time, so 16 minutes becomes 64. Simply doubling the time would be the intuitive but wrong answer and is the mistake this relationship most often causes. Casting time rises steeply with the wall thickness wanted.

Answer: D

Correct answer: Both A and R are true, and R is the correct explanation of A

Both are true and the reason gives the mechanism. Water reaching the plaster must pass through the layer already deposited, so as that layer thickens it becomes its own barrier and the rate falls. The thickness grows roughly as the square root of time, which means doubling the wall takes four times as long - and it is why thick sections are cast by other routes.

Answer: A

Hollow ware such as jugs and sanitaryware is made this way, with the wall thickness set by the time before draining. Solid casting fills a cavity between two mould faces and is used for handles and similar solid parts.

Answer: B

Solid casting fills the whole cavity and gives a solid section, while drain casting produces hollow ware. The names describe the product rather than the method of filling the mould. Drain casting is by far the more common of the two in practice.

Answer: C

Raising the pressure difference across the cast increases the flow of water and shortens the cycle considerably. Polymer moulds able to withstand the pressure have largely replaced plaster in modern sanitaryware plants.

Answer: D

Correct answer: Both A and R are true, and R is the correct explanation of A

Both are true and the reason gives the cause. Pressure casting applies several bars to force water out faster and shorten the cycle from hours to minutes, and plaster would fail rapidly under that repeated loading. Porous polymer moulds withstand it, last for tens of thousands of cycles instead of hundreds, and can be flushed clean rather than dried - which is what makes the process continuous.

Answer: A

Twelve tenths divided by one tenth is twelve, so the driving force is roughly twelve times greater. Since casting rate depends on that pressure, the cycle time falls dramatically. Cycles measured in hours become cycles measured in minutes.

Answer: B

A slip is spread by a doctor blade onto a moving carrier and dried to a flexible green tape. Multilayer capacitors and substrates are made by stacking and laminating such tapes before firing. Layer thicknesses below ten micrometres are routinely achieved.

Answer: C

Its height above the moving carrier sets the wet thickness, which together with the solids content fixes the dried thickness. Fine control here is what makes multilayer devices possible. Blade height and carrier speed are both controlled closely.

Answer: D

Organic solvents are common because they evaporate faster and interact less with the binder, though aqueous systems are increasingly used for environmental reasons. The choice affects drying rate and binder selection together.