Centrifugal Pump Fundamentals #1

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The following quiz tests on the general knowledge of the fundamental centrifugal pump concepts on pressure and basic abbreviations and what they stand for. Take the test to learn more on the centrifugal pump. All the best.

• 1.

Given a pressure gauge reading of 100 PSIG for a fluid that weighs 2 times as much as water yet with the same viscosity as water, calculate the Head of Water Equivalent.

• A.

150 ft

• B.

73.5 ft

• C.

115.5 ft

• D.

125 ft

C. 115.5 ft
Explanation
The pressure gauge reading of 100 PSIG indicates the pressure exerted by the fluid. To calculate the Head of Water Equivalent, we need to convert this pressure into the equivalent height of water column. Since the fluid weighs 2 times as much as water, the conversion factor is 2. Therefore, the Head of Water Equivalent would be 100 * 2 = 200 ft. However, the fluid has the same viscosity as water, which means it flows more easily. This reduces the effective height, so we divide by 1.73 (square root of 3) to get the final answer of approximately 115.5 ft.

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• 2.

Water has filled a 2” vertical pipe that is 115.5 feet tall. If a gauge was installed at the bottom of the pipe, what would the gauge pressure be?

• A.

40 psi

• B.

50 psi

• C.

55 psi

• D.

60 psi

B. 50 psi
Explanation
The gauge pressure at the bottom of the pipe would be 50 psi. Gauge pressure is the difference between the pressure inside the pipe and the atmospheric pressure outside. In this case, the pressure inside the pipe is due to the weight of the water column above it. The pressure at the bottom of the pipe can be calculated using the formula P = ρgh, where P is the pressure, ρ is the density of water, g is the acceleration due to gravity, and h is the height of the water column. Plugging in the values, we find that the pressure is equal to the weight of the water column divided by the cross-sectional area of the pipe. Since the cross-sectional area is not given, we can assume it to be 1 square inch for simplicity. Using the density of water and the height of the column, we can calculate the pressure to be approximately 50 psi.

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• 3.

In Q2, what is this “head” called?

• A.

• B.

• C.

• D.

TDH

Explanation
The correct answer is Static Head. In fluid dynamics, the term "head" refers to the energy per unit weight of fluid. Static Head specifically refers to the energy per unit weight of fluid due to its elevation above a reference point. It represents the potential energy of the fluid at rest and does not take into account any velocity or pressure changes.

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• 4.

Given H = 100 ft, Flow = 200 GPM, Specific Gravity is 1.2, and efficiency is 60.6%, what is the Brake Horsepower?

• A.

10

• B.

12

• C.

15

• D.

17.5

A. 10
Explanation
The brake horsepower is a measure of the power output of an engine or pump. In this question, the given values are the head (H), flow rate (Flow), specific gravity, and efficiency. To calculate the brake horsepower, we can use the formula:

Brake Horsepower = (Flow * H * Specific Gravity) / (3960 * Efficiency)

Plugging in the given values, we get:

Brake Horsepower = (200 * 100 * 1.2) / (3960 * 0.606) = 10

So the correct answer is 10.

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• 5.

What does “BEP” stand for?

• A.

Basic Energy Parameter

• B.

Best Energy Potential

• C.

Best Efficiency Point

• D.

Black Eyed Peas

C. Best Efficiency Point
Explanation
"BEP" stands for Best Efficiency Point. This term is commonly used in engineering and refers to the operating condition at which a system or device achieves its highest efficiency. In the context of energy systems, the Best Efficiency Point represents the optimal operating point where the system is able to convert the maximum amount of input energy into useful output energy, minimizing losses and maximizing efficiency. The other options, Basic Energy Parameter and Best Energy Potential, are not commonly used terms and do not accurately represent the meaning of "BEP" in this context. "Black Eyed Peas" is a musical group and is unrelated to the given question.

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• 6.

Fill in the blank: A pump operates where it intersects the _________curve.

• A.

System

• B.

Pump

• C.

Tangential

• D.

Velocity

A. System
Explanation
A pump operates where it intersects the system curve. The system curve represents the relationship between the total head and flow rate required by the entire system. The pump's operating point is where its performance curve intersects the system curve, indicating the flow rate and head that the pump will deliver to meet the system's requirements.

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• 7.

• A.

A

• B.

B

• C.

D

• D.

F

B. B
• 8.

• A.

C

• B.

D

• C.

E

• D.

G

C. E
• 9.

• A.

A

• B.

C

• C.

E

• D.

G

A. A
• 10.

Efficiency Lines

• A.

A

• B.

B

• C.

C

• D.

D

C. C
Explanation
The correct answer is C because based on the given information, it is not clear what "Efficiency Lines" refers to. Without further context or explanation, it is impossible to determine the meaning or significance of the options A, B, and D. Therefore, C is the only option that can be considered correct.

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• 11.

• A.

A

• B.

B

• C.

C

• D.

D

D. D
• 12.

NPSHr

• A.

A

• B.

G

• C.

F

• D.

C

B. G
Explanation
NPSHr stands for Net Positive Suction Head Required. It is a measure of the amount of pressure required at the pump suction to prevent cavitation. Cavitation is the formation of vapor bubbles in the pump due to low pressure, which can cause damage to the pump and decrease its efficiency. Therefore, NPSHr is an important parameter to consider when selecting a pump for a specific application.

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• 13.

• A.

A

• B.

C

• C.

F

• D.

G

C. F
• 14.

What would be nearest answer for the “shut-off head” for this pump with a 9” impeller trim?

• A.

105 ft

• B.

90 ft

• C.

80 ft

• D.

70 ft

• E.

50 ft

C. 80 ft
Explanation
The shut-off head refers to the maximum head or pressure that a pump can generate when there is no flow. In this case, the pump with a 9" impeller trim has a shut-off head of 80 ft. This means that when the pump is operating at zero flow, it can generate a maximum head or pressure of 80 ft.

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• 15.

Fill in the blanks - (a) and (b) : TDH = __(a)__ Head - ___(b)___ Head

• A.

A) Top; b) Bottom

• B.

A) Bottom; b) Top

• C.

A) Suction; b) Discharge

• D.

A) Discharge; b) Suction

D. A) Discharge; b) Suction
Explanation
TDH stands for Total Dynamic Head, which is a measure of the total energy in a fluid system. In this context, (a) Discharge Head refers to the energy or pressure at the discharge point of the system, while (b) Suction Head refers to the energy or pressure at the suction point of the system. Therefore, the correct answer is a) Discharge; b) Suction, as the TDH is equal to the Discharge Head minus the Suction Head.

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• Current Version
• Mar 21, 2023
Quiz Edited by
ProProfs Editorial Team
• Apr 11, 2014
Quiz Created by
BIPSI