EXAMINATION CONDITIONS
National Module EA706
TAFE Subject 7759X
Time Allowed 2 hours
Calculators may be used.
Attempt all questions
Show all working
TOTAL MARKS 60
This test is worth 60 % of your assessed mark.
Marks for questions are shown in [square] brackets.
DATA & FORMULAE
Question 1.[12]
Question 2.[13]
- Write down the Bernoulli equation and explain each of the terms.[4]
- What is a "stream line".[3]
- Explain why a pump will not work if it is placed at the top of a well when the water surface is 15 meters below the pump.[5]
Question 3.[15]
- A pump is used to fill a water tank dimensions 4m x 4m x 2m deep. Water is delivered through a 50mm inside?? pipe with a velocity of 3m/s. How long will it take to fill the tank? [8]
- If the inlet to the pump has an inside diameter of 75 mm, what will the velocity of water be at the inlet?[5].
Diesel fuel (RD = 0.9) is kept in an overhead storage tank. The lower surface of the tank is 2.8 meters above ground level, and the depth of fuel in the container is 1.5 meters.Question 4.[20]
Fuel is delivered through a flexible hose of inside diameter 40mm attached to the bottom of the tank. The end of the hose has a hand operated valve with a nozzle of diameter 18mm.
It is desired to fuel a tractor. The height of the fuel tank opening is 1.6 meters above ground level. Calculate:
- The pressure in the pipe just behind the valve when the valve is closed.[5]
- The flow rate from the nozzle when the valve is fully opened.[5]
- The pressure in the pipe when the valve is fully opened. [5]
A pump is used to deliver 180 litres of water per minute from a spring located 3 meters below the pump to a tank that is 35 meters above the pump. Head losses due to friction are 3.5 meters. Find:
- The power added to the water. [7]
- The input energy power if the efficiency of the pump is 83%. and the of the petrol driven motor is 32%.[6]
- The volume of water that would be pumped by 3 litres of petrol, if the energy is 35 MJ per litre.[7]