Is grading on a curve fair?

Is grading on a curve fair?

This is a fair system, because the students are still getting the same grades relative to each other. So if he curves up, all the kids still get a grade that is the same relative to their peers that they would have before. When it’s NOT fair is to try and curve on a bell when you DON’T have that distribution.

How bell curve works in performance appraisal?

Bell curve system of performance appraisal is a forced ranking system imposed on the employees by the management. Bell curve method assumes that employees in a company can be divided into groups such as: High Performers – Top 20% Average Performers – The middle 70%

How do I get a good appraisal rating?

How to prepare yourself to get good appraisal

1. Own the system. Know your employer’s annual performance appraisal system thoroughly.
2. Gather the facts.
3. Keep the discussion alive.
4. Work the self-appraisal.
5. Wear the shoes.
6. Expect to be surprised.
7. Bring a solution.
8. Share a goal.

What is a performance curve?

A pump performance curve indicates how a pump will perform in regards to pressure head and flow. A curve is defined for a specific operating speed (rpm) and a specific inlet/outlet diameter. The curve also shows the shut off head or the head that the pump would generate if operating against a closed valve.

What is the total head of a pump?

Total Head is the measure of a pump’s ability to push fluids through a system. Total Head is proportional to the difference in pressure at the discharge vs. the suction of the pump.

How do you calculate the total dynamic head of a pump?

The total dynamic head of a water system must be considered when determining the size of pumping equipment to be installed. It determines the various head losses that the pump must overcome. Total dynamic head = elevation head + friction head loss + pressure head.

What is the total dynamic head of a pump?

Total Dynamic Head (TDH) is the amount of head or pressure on the suction side of the pump (also called static lift), plus the total of 1) height that a fluid is to be pumped plus 2) friction loss caused by internal pipe roughness or corrosion.

What is static and dynamic head of a pump?

In fluid dynamics, Total Dynamic Head (TDH) is the total equivalent height that a fluid is to be pumped, taking into account friction losses in the pipe. where: Static Lift is the height the water will rise before arriving at the pump (also known as the suction head). Friction Loss (or Head Loss).

How do you calculate the head of a centrifugal pump?

1. IMPORTANT NOTES :
2. TOTAL HEAD CALCULATION:
3. Total Head = suction Head + Delivery Head. Suction Head calculation = Suction vertical Height ( From Foot valve to Pump Centre) + Horizontal pipe line used + No of Bend (or) Elbow used in suction pipe line.
4. Example :-
5. Actul. Runnin.
6. Actul Total Head. —-
7. Head Conversion. Feet.

What is total dynamic head in feet of water?

Total Dynamic Head (TDH) refers to the total equivalent height that a fluid will be pumped by taking into consideration any friction losses in the pipe. Essentially “dynamic head” is the measurement of resistance working against your pool pump as it pulls water from your basin and pushes it back to the pool.

What causes dynamic head loss?

“A long-in-service pump’s dynamic head can vary from the published curve.” Pressure demands in pumped liquid systems come from dynamic and static sources. Friction in the system causes the dynamic losses. For Newtonian fluids, these losses are proportional to the square of the velocity in the system.

How do you calculate NPSH?

Explanation: To calculate NPSH Available, take the source pressure , add the atmospheric pressure , subtract the losses from friction within the pipeline and subtract the vapor pressure of the fluid . The result equals the NPSHA (or Net Positive Suction Head Available) of your system.

What is the difference between static and dynamic head?

STATIC HEAD – head of a fluid when it is static ie. not moving. For example in a beaker. DYNAMIC HEAD – head of flowing fluid due to its velocity.

How do I calculate static pressure?

Add total elbow equivalents to the length of straight duct to arrive at the total system duct length. Multiply the static pressure for 100 feet of duct by the percentage of 100 feet that you have. This will be the static pressure caused by the ductwork.

What is meant by dynamic pressure?

Dynamic pressure is the kinetic energy per unit volume of a fluid. Dynamic pressure is one of the terms of Bernoulli’s equation, which can be derived from the conservation of energy for a fluid in motion.

What is difference between static pressure and dynamic pressure?

Static pressure is the pressure you have if the fluid isn’t moving or if you are moving with the fluid. Dynamic pressure is the pressure of a fluid that results from its motion. It is the difference between the total pressure and static pressure.