Dynamic Pumps Flashcards
What is gauge pressure?
Gauge pressure is the pressure measured relative to the ambient atmospheric pressure.
True or False: Absolute pressure includes atmospheric pressure.
True
What is the formula for converting gauge pressure to absolute pressure?
Absolute Pressure = Gauge Pressure + Atmospheric Pressure
Fill in the blank: Vacuum pressure is measured as a pressure that is _____ than atmospheric pressure.
lower
What unit is commonly used to measure pressure in dynamic pumps?
Pascals (Pa) or pounds per square inch (psi)
What is head pressure in the context of pumps?
Head pressure refers to the height of a fluid column that a pump can support.
How does increasing the head pressure affect a pump’s performance?
Increasing head pressure generally increases the pump’s ability to move fluid to greater heights.
True or False: A vacuum gauge measures absolute pressure.
False
What is the typical atmospheric pressure at sea level in psi?
14.7 psi
What does a negative reading on a gauge pressure indicate?
It indicates that the pressure is below atmospheric pressure.
Multiple Choice: What type of pressure is used to determine the actual pressure exerted by a fluid in a system? A) Gauge Pressure B) Absolute Pressure C) Both A and B
C) Both A and B
What is the absolute pressure at 0 psi gauge pressure at sea level?
14.7 psi
True or False: The term ‘head’ in head pressure refers to the pressure due to the weight of the fluid.
True
Fill in the blank: The pressure measurement that reflects the weight of the atmosphere is known as _____ pressure.
absolute
What is typically considered a vacuum in terms of pressure?
A pressure lower than atmospheric pressure, often measured in inches of mercury (inHg) or millibars.
How is head pressure calculated in a fluid system?
Head Pressure (ft) = Pressure (psi) x 2.31
Multiple Choice: Which of the following is not a type of pressure? A) Gauge Pressure B) Head Pressure C) Flow Pressure
C) Flow Pressure
What happens to gauge pressure when the atmospheric pressure changes?
Gauge pressure remains constant; it only reflects the pressure relative to atmospheric pressure.
True or False: Vacuum pumps are designed to create low absolute pressures.
True
What is the primary purpose of a dynamic pump?
To convert mechanical energy into hydraulic energy to move fluids.
Fill in the blank: A pump’s efficiency can be affected by changes in _____ and head pressure.
gauge pressure
What is the relationship between head pressure and flow rate in a pump?
Generally, as head pressure increases, flow rate decreases and vice versa.
Multiple Choice: Which pressure is crucial for determining the performance of a pump? A) Gauge Pressure B) Absolute Pressure C) Both A and B
C) Both A and B
What does a vacuum pressure gauge measure?
It measures the pressure below atmospheric pressure in a system.
True or False: The use of a manometer is common for measuring gauge pressure.
True
What is a common application of vacuum pressure in industry?
In processes like distillation and evaporation to lower boiling points.
Fill in the blank: To achieve a specific head pressure, the pump must overcome _____ pressure.
static
What does a higher head pressure indicate about a pump’s capability?
It indicates that the pump can move fluid to greater heights.
What happens to the absolute pressure as altitude increases?
Absolute pressure decreases as altitude increases.
True or False: Dynamic pumps can operate efficiently at varying head pressures.
True
What is the significance of understanding vacuum pressure in pump systems?
It helps in evaluating the efficiency and operational limits of pumps.
Multiple Choice: Which of the following best describes absolute pressure? A) It is always higher than gauge pressure B) It is the sum of gauge pressure and atmospheric pressure C) It is the pressure relative to a perfect vacuum
C) It is the pressure relative to a perfect vacuum
Fill in the blank: A pressure reading of 0 psi on a gauge indicates _____ pressure.
atmospheric
What type of pressure measurement is crucial for ensuring safety in pressurized systems?
Gauge pressure
True or False: A change in temperature can affect the density of a fluid, thus impacting head pressure.
True
What is the typical range of absolute pressure at sea level in pascals?
101,325 Pa
Multiple Choice: Which of the following tools is used to measure absolute pressure? A) Bourdon gauge B) Manometer C) Vacuum gauge
A) Bourdon gauge
Fill in the blank: In a closed system, if the gauge pressure is 10 psi, the absolute pressure is _____ psi at sea level.
24.7
What role does atmospheric pressure play in determining gauge pressure?
It serves as the baseline reference for gauge pressure measurements.
True or False: Vacuum pressure gauges can display negative values.
True
What is the relationship between fluid velocity and static pressure in dynamic pumps?
As fluid velocity increases, static pressure decreases.
Fill in the blank: The pressure exerted by a fluid at rest is referred to as _____ pressure.
static
What is the effect of cavitation on pump performance?
Cavitation can lead to decreased efficiency and potential damage to the pump.
True or False: All dynamic pumps are designed to operate under the same pressure conditions.
False
What is the significance of a vacuum in a pumping system?
It indicates the degree of suction that can be achieved to move fluids.
What is the common pressure measurement unit for vacuum systems?
inHg (inches of mercury)
Multiple Choice: Which type of pressure is typically used in hydraulic systems? A) Gauge Pressure B) Absolute Pressure C) Both A and B
A) Gauge Pressure
Fill in the blank: The difference between absolute pressure and gauge pressure is _____ pressure.
atmospheric
What happens to head pressure when a pump is throttled?
Head pressure decreases.
True or False: Gauge pressure can be negative.
False
What is the primary measurement of interest when assessing pump performance?
Both gauge pressure and head pressure
Fill in the blank: A pressure of 0 inHg indicates _____ pressure.
atmospheric
What is the effect of temperature on fluid viscosity and pressure in pumps?
Increased temperature typically decreases viscosity, affecting pressure and flow.
True or False: Dynamic pumps can only operate in a specific range of head pressures.
True
What is the purpose of a pressure relief valve in a pump system?
To prevent excessive pressure buildup that could damage the system.
Fill in the blank: The pressure at the pump’s discharge is known as _____ pressure.
discharge
What does a pressure drop in a system indicate?
It may indicate a blockage or restriction in the flow path.
Multiple Choice: Which of the following factors can affect head pressure? A) Pump speed B) Fluid density C) Both A and B
C) Both A and B
Fill in the blank: When measuring head pressure, the reference point is typically the _____ of the fluid.
surface
What is the main advantage of using a centrifugal pump?
High flow rate and ability to handle varying head pressures.
True or False: The pressure at the inlet of a pump is typically higher than at the outlet.
False
What does a vacuum pressure of -10 psi indicate?
It indicates that the pressure is 10 psi lower than atmospheric pressure.
Fill in the blank: The efficiency of a pump is influenced by its _____ pressure and flow rate.
head
What is the role of impellers in dynamic pumps?
Impellers convert rotational energy into kinetic energy to move fluids.
Multiple Choice: Which pressure measurement is essential for troubleshooting pump issues? A) Gauge Pressure B) Absolute Pressure C) Both A and B
C) Both A and B
Fill in the blank: The measurement of pressure in a vacuum system is typically expressed in _____ of mercury.
inches
What is the primary reason for monitoring head pressure in a pumping system?
To ensure proper operation and prevent damage to the pump.
True or False: Fluid dynamics plays a critical role in understanding pressure changes in pumps.
True
What happens to gauge pressure if the atmospheric pressure increases?
Gauge pressure remains the same; it is not affected by changes in atmospheric pressure.
Fill in the blank: The maximum head pressure achievable is limited by the _____ pressure of the fluid.
suction
What is the relationship between pressure and flow rate in a centrifugal pump?
As flow rate increases, pressure typically decreases.
