We appreciate your visit to Q01 The production rate for casting process is usually and that for a thermoforming process is comparatively Options A high high B low higher C. This page offers clear insights and highlights the essential aspects of the topic. Our goal is to provide a helpful and engaging learning experience. Explore the content and find the answers you need!
Answer :
Let's tackle each question one by one:
Q01. The production rate for casting process is usually ____, and that for a thermoforming process is comparatively.
To answer this, let's first understand the processes:
- Casting Process: This involves pouring liquid material into a mold, where it solidifies into the required shape. It is often used for complex shapes and large components. The production rate for casting is generally medium because it involves significant cooling and processing time.
- Thermoforming Process: This involves heating a plastic sheet and forming it over a mold. It is typically faster than casting since it involves moldable plastic rather than melting and solidifying metal. Thus, the production rate is generally higher than that of casting.
Therefore, the correct answer is B. low, higher.
Q02. The advantage of open-die forging is that:
Open-die forging is a process where a piece of metal is shaped by pressing between two flat or simple contoured dies. Unlike closed-die forging, there is no cover or specific cavity shaping the metal.
- Material is utilized efficiently: This is false because open-die forging usually involves more material wastage compared to closed-die forging.
- It can be used for complex shapes: This is not entirely true since complex shapes often require closed-die forging for detailed precision.
- Wide range of workpiece sizes can be used: This is true. Open-die forging is versatile, accommodating various sizes and shapes.
- Final cost of production is very low: Not always true as it depends heavily on the workpiece.
Therefore, the correct answer is C. wide range of workpiece sizes can be used.
Q03. Consider a boat, built with sheet metal on a wooden frame, has an average density which is greater than that of water. Determine how will the boat float in water?
The concept of flotation involves buoyancy, which states that an object will float if it displaces a volume of water equal to its own weight.
- If the average density of the boat (considering its hollow body) is greater than that of water, the boat will initially float thanks to its shape and hollow structure.
- However, if overturned, the distributed density (due to water filling the hollow section) will no longer support flotation. Thus, it will sink.
Therefore, the correct option is B. The boat will float with its hollow face upwards, but will sink once it overturns.
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