The question asks to identify the type of pump associated with the term "vane". This requires knowledge of the basic working principles and components of different pump types.
Correct Option: B) Vane pump — Vane pumps are a type of positive displacement pump that utilize a rotor with radially sliding vanes. These vanes create chambers that expand to draw fluid in and then contract to force it out, making the term "vane" central to their design and function.
The question asks to identify the component in a centrifugal pump responsible for directing fluid to the impeller. We need to understand the function of each listed component in a centrifugal pump.
A) Suction eye is the central opening of the impeller through which the fluid enters the impeller vanes from the suction pipe. It is specifically designed to guide the fluid smoothly into the rotating impeller.
The specific speed of a pump is a dimensionless parameter that characterizes the pump's geometry and operating conditions. It is used to classify pumps and predict their performance. Understanding its definition and application is key to answering this question.
B) The performance characteristics. Specific speed is a fundamental parameter that characterizes the type of pump and its inherent performance characteristics, such as its ability to handle high flow/low head or low flow/high head conditions. It helps in selecting the most suitable pump type for a given application.
The question asks about the main advantage of a peristaltic pump. We need to understand the working principle of a peristaltic pump and identify its key benefits compared to other pump types.
Correct Option: B) Contact-free pumping. This is the primary advantage because the fluid is entirely contained within a flexible tube, preventing contamination and protecting the pump's internal mechanisms from the pumped medium.
The question asks for the definition of a pump's "shut-off head." This term is fundamental in pump performance characteristics, typically represented by a pump curve. We need to understand what happens to the head developed by a pump when there is no flow.
A) Maximum head at zero flow — This accurately defines the shut-off head. It is the highest head a pump can produce when its discharge valve is closed, resulting in no flow.
The question asks to identify the type of pump commonly used in aquariums and small water features. This requires knowledge of the typical applications of various pump types.
Correct Option: B) Centrifugal pump
Centrifugal pumps are the most common type of pump used in aquariums and small water features. They operate by using an impeller to draw water in and then propel it outwards due to centrifugal force, creating flow. They are efficient, relatively quiet, and available in various sizes suitable for these applications.