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# Centrifugal Pumps MCQs - Fluid Mechanics

Centrifugal Pumps MCQs - Fluid Mechanics: This section contains the multiple-choice questions and answers on the fluid mechanics chapter Dimensional and Model Analysis. practice these MCQs to learn and enhance the knowledge of Dimensional and Model Analysis.

## List of Fluid Mechanics - Centrifugal Pumps MCQs

1. Which of the following is not a component of a centrifugal pump?

1. Impeller
2. Diffuser
3. Piston
4. Casing

Explanation:

Pistons are not part of centrifugal pumps; they are associated with reciprocating pumps

2. What is the primary function of a centrifugal pump?

1. Mixing fluids
2. Generating pressure
3. Measuring flow rate
4. Filtering fluids

Explanation:

Centrifugal pumps are primarily used to generate pressure and move fluids through a system.

3. What is the primary component responsible for creating centrifugal force in a centrifugal pump?

1. Impeller
2. Bearings
3. Shaft
4. Casing

Explanation:

The impeller is the rotating component that imparts kinetic energy to the fluid, creating centrifugal force.

4. Which part of the centrifugal pump houses the impeller and directs the flow of fluid?

1. Casing
2. Shaft
3. Volute
4. Bearings

Explanation:

The casing surrounds the impeller and guides the flow of fluid through the pump.

5. Which part of the pump is responsible for maintaining the axial alignment of the shaft?

1. Bearings
2. Impeller
3. Casing
4. Volute

Explanation:

Bearings support the shaft and maintain its axial alignment.

6. What is the purpose of the volute in a centrifugal pump?

1. To transmit power to the impeller
2. To direct the flow of fluid into the impeller
3. To support the bearings
4. To house the impeller

Answer: B) To direct the flow of fluid into the impeller

Explanation:

The volute is a curved casing that helps direct fluid into the impeller.

7. Which part of the centrifugal pump is responsible for adjusting the flow rate and head of the pump?

1. Impeller
2. Casing
3. Volute
4. Shaft

Explanation:

The volute shape can be adjusted to control the pump's flow rate and head.

8. What is the suction head in a centrifugal pump?

1. The height from the pump outlet to the pump centerline
2. The height from the pump inlet to the pump centerline
3. The pressure at the pump inlet
4. The pressure at the pump outlet

Answer: B) The height from the pump inlet to the pump centerline

Explanation:

The suction head is the vertical distance from the pump inlet to the pump centerline. It represents the height difference between the liquid source and the pump inlet.

9. Which of the following represents the delivery head of a centrifugal pump?

1. The height from the pump outlet to the pump centerline
2. The height from the pump inlet to the pump centerline
3. The pressure at the pump inlet
4. The pressure at the pump outlet

Answer: B) The height from the pump inlet to the pump centerline

Explanation:

The delivery head is the pressure at the pump outlet, typically measured in meters of fluid column

10. What does the manometric head in a centrifugal pump represent?

1. The kinetic energy of the fluid
2. The potential energy of the fluid
3. The pressure energy of the fluid
4. The friction losses in the pump

Answer: C) The pressure energy of the fluid

Explanation:

The manometric head represents the pressure energy of the fluid, typically expressed in meters of fluid column.

11. In a multistage centrifugal pump, what happens as the fluid passes through each stage?

1. Pressure decreases
2. Velocity decreases
3. Pressure increases
4. Velocity increases

Explanation:

Each stage of a multistage centrifugal pump adds energy to the fluid, increasing its pressure.

12. Which component of a multistage centrifugal pump is responsible for converting mechanical energy into kinetic energy?

1. Impeller
2. Casing
3. Shaft
4. Diffuser

Explanation:

The impeller is the rotating component that imparts kinetic energy to the fluid.

13. What is the primary advantage of using a multistage centrifugal pump in applications with high head requirements?

1. Lower maintenance costs
2. Energy efficiency
3. Reduced noise levels
4. Higher pressure capabilities

Explanation:

Multistage centrifugal pumps are known for their ability to generate high pressure, making them suitable for high-head applications.

14. What is cavitation in a centrifugal pump?

1. The erosion of the pump impeller due to high-pressure
2. The formation of vapor bubbles in the pump due to low-pressure
3. The pump's inability to maintain a steady flow rate

Answer: B) The formation of vapor bubbles in the pump due to low-pressure

Explanation:

Cavitation occurs when the pressure in a centrifugal pump drops to the vapor pressure of the liquid, causing bubbles to form. These bubbles can collapse, leading to damage to the pump and reduced efficiency

15. What does NPSH represent in NPSH calculations?

1. Atmospheric pressure at the pump inlet
2. Theoretical pump speed
4. Vapor pressure of the liquid

Answer: A) Atmospheric pressure at the pump inlet

Explanation:

NPSH (Net Positive Suction Head) includes atmospheric pressure as it represents the total pressure at the pump inlet.