The question asks for the fundamental principle behind the operation of most mechanical pumps. We need to identify the physical phenomenon that enables pumps to move fluids.
B) Hydraulic pressure is the correct answer because all mechanical pumps, regardless of their specific design (centrifugal, positive displacement, etc.), function by creating a pressure differential within the fluid, thereby enabling its movement. The energy input to the pump is converted into hydraulic pressure energy in the fluid.
The question asks to identify the type of pump commonly used for lifting water from a well. We need to evaluate the characteristics and typical applications of each given pump type.
Correct Option: C) Submersible pump. Submersible pumps are specifically designed to be placed inside the well, below the water level. They push the water upwards, which is very efficient for deep wells and eliminates the need for priming. Their sealed design protects the motor from water, making them ideal for continuous operation in a submerged environment.
The question asks about the primary function of an impeller in a centrifugal pump. We need to understand how a centrifugal pump works and what role its main rotating component, the impeller, plays in the process.
Correct Option: A) Increase Pressure
The impeller's rotation imparts kinetic energy to the fluid, which is subsequently converted into pressure energy in the pump casing. Thus, its ultimate function is to increase the fluid's pressure to enable it to be moved against resistance.
The question asks about the primary application of a diaphragm pump. We need to understand the working principle and characteristics of diaphragm pumps to determine their most suitable use case among the given options.
Correct Option: B) A fluid needs to be moved without contamination
The question asks about the defining characteristic of self-priming pumps. Understanding the basic principle of pump priming is key to answering this question. Priming refers to the process of filling the pump casing and suction line with the liquid to be pumped, expelling air or gas, to allow the pump to create the necessary vacuum for operation.
A) Start pumping without manual priming — This is the defining characteristic of a self-priming pump. It means the pump can automatically evacuate air from its suction line and casing to begin pumping liquid without needing to be manually filled with liquid first.
The question asks to identify the 'suction side' in a centrifugal pump. Understanding the basic operation of a centrifugal pump is key to answering this. A centrifugal pump works by drawing fluid in and then expelling it at a higher pressure and velocity.
A) Fluid enters the pump. This accurately describes the suction side. The suction pipe connects the fluid source to the pump's inlet, and fluid is drawn into the pump through this side.