Aux 1 Unit 3 Q2

Correct Answer: B) It is lightweight and offers quick operation

Explanation: Butterfly valves are preferred in ballast systems because they are lightweight, compact, and allow for quick opening and closing, which is essential for the efficient management of ballast water.

Correct Answer: C) It provides rapid and reliable shutoff

Explanation: The quick closing, screw lift valve is specifically designed to provide rapid shutoff in critical situations, such as emergencies where the fuel supply needs to be isolated quickly to prevent further escalation of a hazardous event.

Correct Answer: B) It allows for seamless switching between different flow paths

Explanation: A 3-way valve is designed to smoothly divert or mix flows, which is essential for applications that require the redirection of fluid between different circuits without interrupting the flow.

Correct Answer: A) On a fuel oil service tank outlet for emergency shutdown

Explanation: Quick closing, screw lift valves are used in situations requiring rapid shutoff, such as on fuel oil service tank outlets. They are designed to quickly isolate the fuel supply in emergencies, preventing fuel from feeding a fire.

Correct Answer: C) The diaphragm prevents contamination and clogging

Explanation: The diaphragm in this valve type separates the flow medium from the valve’s internal components, making it ideal for controlling slurries and viscous fluids, as it reduces the risk of clogging and contamination.

Correct Answer: A) Diverting flow between two different circuits

Explanation: A 3-way valve is commonly used to divert flow between two different circuits or to mix two different fluids, making it ideal for applications where flow needs to be redirected or mixed.

Correct Answer: B) Slurry or viscous fluid control

Explanation: Diaphragm valves are well-suited for handling slurry, viscous fluids, or corrosive chemicals because they have a flexible diaphragm that isolates the fluid from the valve's moving parts, reducing the risk of clogging or corrosion.

Correct Answer: B) It prevents backflow of water into the bilge

Explanation: The main function of a screw-down, non-return valve is to prevent backflow, which is essential in bilge pump systems to avoid water re-entering the bilge once it has been pumped out.

Correct Answer: B) Ballast water systems on ships

Explanation: Butterfly valves are most suitable for applications like ballast water systems where quick operation and control of large volumes of fluid are required. They are ideal for such systems due to their compact design, low pressure drop, and ease of operation.

Correct Answer: A) Ensuring unidirectional flow in bilge pump discharge lines

Explanation: Screw-down, non-return valves are designed to ensure that fluid flows in only one direction, making them suitable for applications like bilge pump discharge lines where backflow prevention is critical.