Aux 1 Unit 3 Q8

Correct Answer: B) Brass, because it is corrosion-resistant and durable in water systems

Explanation: Brass is commonly used for the valve body in water systems due to its excellent corrosion resistance and durability, making it suitable for use with potable water and other fluids in HVAC systems.

Correct Answer: B) It connects the actuator to the valve disc or plug, allowing for the control of fluid flow

Explanation: The stem is a crucial component that connects the actuator to the valve disc or plug, enabling the actuator to control the position of the disc or plug, and thereby regulate the flow and mixing of the fluids.

Correct Answer: B) Two inlets and one outlet

Explanation: A 3-way mixer valve typically has two inlets for the two different fluids that need to be mixed and one outlet for the combined fluid. This configuration allows for effective mixing of the input streams.

Correct Answer: C) To mix hot and cold water in a heating system

Explanation: A common application for a 3-way mixer valve is to mix hot and cold water in a heating system. By adjusting the proportions of hot and cold water, the valve helps maintain the desired output temperature for heating or domestic water supply.

These questions should help you understand the design, components, and operation of a 3-way mixer valve, as well as its common applications in fluid systems.

Correct Answer: B) Verify that the valve is aligned correctly with the flow direction indicated by the manufacturer

Explanation: It is crucial to ensure that the valve is installed according to the manufacturer's instructions, with proper alignment of the flow direction. This ensures that the mixing process functions correctly and efficiently.

Correct Answer: C) The valve disc or plug

Explanation: The valve disc or plug inside the valve body is responsible for directing the flow of the two input fluids. By adjusting the position of the disc or plug, the valve controls the proportion of each fluid entering the mixed output stream.

Correct Answer: A) To mix two different fluids and control the output temperature or flow rate

Explanation: A 3-way mixer valve is designed to combine two different fluid streams, often to control the output temperature or flow rate of the mixed fluid. This is commonly used in heating, ventilation, and air conditioning (HVAC) systems.

Correct Answer: C) The valve may experience leaks or improper mixing due to wear and tear on the disc or seat

Explanation: Without regular maintenance, the disc or seat may wear down, leading to leaks or improper mixing of the fluids. This can compromise the performance of the system and lead to inefficiencies or failures.

Correct Answer: B) By adjusting the position of the valve disc or plug to regulate the flow of the input fluids

Explanation: The actuator controls the mixing process by adjusting the position of the valve disc or plug, thereby regulating the amount of each input fluid that is allowed to flow into the output stream.

Correct Answer: A) To provide a seal when the valve is closed

Explanation: The valve seat provides a seal between the disc or plug and the valve body, ensuring that when the valve is closed or partially closed, there is no leakage of fluid, maintaining the integrity of the mixing process.