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the main difference between them is the way that energy is added to the fluid to be converted to pressure increase.
In dynamic pumps, energy is added to the fluid continuously through the rotary motion of the blades. These rotating blades raise the momentum of fluid and the momentum then is converted to pressure energy through diffuser in pump outlet.
In positive displacement pumps, the energy is added periodically to the fluid. the pump has reciprocating motion by pistons for example. When the fluid enters the pump through valves, the reciprocating piston begins to press the fluid resulting in going out of the pump with pressure rise.
What else can I help you with?
Why reciprocating pump is called positive displacement pump?
because they deliver a fixed quantity of the discharge irrespective of their rpm
What is the key difference between gauging and variable inspection?
The key difference between gauging and variable inspection lies in their measurement methods. Gauging typically involves the use of fixed tools to determine whether a part meets specific criteria, often resulting in a pass/fail outcome. In contrast, variable inspection measures continuous data (like dimensions or weight) that can provide a range of values, allowing for more detailed analysis of product quality. This distinction affects how quality control is implemented in manufacturing processes.
Where thrust bearing located in steam turbine?
The thrust pads will be there at the front or non drive end of the turbine side....These are usually used to limit the axial displacement of the rotor( Means to minimize the movement of rotor axially in order to maintain the axial clearance between the moving blades and the fixed blades of steam turbine rotor).....
What is compressor turndown?
Turndown: The allowable operating range for the centrifugal compressor between the design point and the surge line at any given speed for a fixed compressor head.
How does a Variable speed transmission work?
Assume a 3 phase AC Induction motor. The speed of the motor is derived by the formula N = (120/f)/P. N speed, f - frequency, P number of poles. In an induction motor P is fixed by the winding. f system frequency. Variable speed drives change the system frequency so that the speed (N) can be varied. Drive is a power electronic device through which the system frequency can be varied
Can a gear pump be a fixed or variable displacement pump?
Fixed
The difference between fixed and variable inputs?
difference between fixed and variable inputs
What are the differences between a variable APR and a fixed APR?
A variable APR can change over time based on market conditions, while a fixed APR remains the same throughout the life of the loan.
What is the differences between Fixed Direct labor with variable direct labor?
Direct labor which do not vary with level of production is fixed direct labor while labor vary with change in production is variable direct labor.
What is the difference between a fixed resistor and a variable resistor?
its the colour of the fixed and the variable we define it by its power and name
What is the difference between fix and variable mortgages?
The difference between fixed and variable mortgages are that in a fixed mortgage, the rate can not change. In a variable mortgage, the rate changes with time.
What determines the difference between a variable and a fixed cost?
The relataionship of cost between the level of production is determine the fixed or variable cost if cost change with production level then it is variable cost otherwise fixed cost.
What is variable ratio and variable interval?
different between variable intervals and fixed ratio
What is the difference between a fixed second mortgage and one with a variable rate?
The difference between a fixed second mortgage and one with a variable rate is that fixed second mortgage has a fixed rate and is commonly thought of as safer than a mortgage with a variable rate.
What is difference between fixed overhead and variable overhead?
The difference between fixed overhead and variable overhead is that fixed overheads are the ones that do not change regardless and variable overheads are the ones that vary depending on the number of units that it produces. An example of fixed overhead is a managers salary.
What are the differences between fixed and variable APR, and how do they impact the overall cost of borrowing?
The main difference between fixed and variable APR is that fixed APR stays the same throughout the loan term, while variable APR can change based on market conditions. Fixed APR provides more predictability in monthly payments, while variable APR can lead to fluctuating payments. The impact on the overall cost of borrowing is that fixed APR offers stability and easier budgeting, while variable APR can result in lower initial rates but potentially higher costs over time if rates increase.
What are the differences between fixed and variable interest rates on loans?
Fixed interest rates on loans remain the same throughout the loan term, providing predictability in monthly payments. Variable interest rates can change based on market conditions, leading to fluctuating payments.
