### CIVIL DIPLOMA 4TH SEMESTER MODEL QUESTION PAPER Hydraulics

CIVIL DIPLOMA 4TH SEMESTER MODEL QUESTION PAPER Hydraulics

 Test/Date and Time Semester/year Course/Course Code Max Marks Ex: I test/6 th week of sem 10- 11 Am IV SEM Hydraulics 20 Year: 2015-16 Course code:15CE41T Name of Course coordinator :                                                                               Course Outcome : 1,2 Note: Answer all questions Question M CL CO PO 1 1. State the different principles of measurement of pressure. 3 R 1 1,2,3 2 2. Differentiate between specific weight and specific gravity of an oil. 4 U 1 1,2,3 3 3. Define Bernoulli’s theorem. 2 R 2 1,2,3,4 4 4. State the difference between uniform flow and non-uniform flow & steady and unsteady flow 4 U 2 1 to 6 5 a)  A simple Manometer containing mercury is used to measure the pressure of water flowing in a pipe line. The mercury level in the open tube is 60mm higher than that in the left tube. If the height of water in the left tube is 500mm, determine the pressure in the pipe in terms of head of water. OR b)  Water is flowing through a pipe of 100mm diameter with an average velocity of 10m/s. Determine the rate of discharge of the water in litres/salsa determine the velocity of water at the other end of the pipe, if the diameter of the pipe is gradually changed to 200mm. 7 A 1 ,2 1 to 6

 TEXT BOOKS
1. Hydraulics and Fluid Mechanics - Dr. P.N.Modi and DrS.M.Seth
2. Hydraulics and Fluid Mechanics - Dr. JagadishLal
3. Hydraulics and Fluid Mechanics - Abdulla Sheriff
4. Hydraulics and Hydraulic Machinery V. Thanikachelam T.T.T.I Madras - 600 113
5. Hydraulics, Fluid Mechanics and Fluid Machines - S.Ramamrutham.
6. Hydraulics, Fluid Mechanics and Fluid Machines Bansal A R.
7. Hydraulics, Fluid Mechanics and Hydraulic Machines R S Khurmi

Model Question Paper
Diploma in Civil Engineering
4TH semester
Course title: HYDRAULICS
Time: 3Hrs. Max. marks : 100
Part –A
Answer any six questions each carries 5 marks

1. Distinguish between gauge pressure and absolute pressure.
2. What is Manometer? Explain differential manometer with a neat sketch.
3. Draw a neat sketch of Venturimeter and name the parts.
4. State the limitations of Bernoulli’s theorem.

5. Define Hydraulic coefficients and give the relation between them.
6. List different major and minor losses in pipe flow.
7. What is water hammer?
8. Define most economical section & state the conditions for a rectangular channel.
9. Explain the term open channel & list the various types of open channels.

Part –B
Answer any seven each question carries 10 marks

1. a) Define Pressure head and Total Pressure.
b) A rectangular tank 3mx4m in size contain water upto a depth of 2.5m. Calculate the total pressure on the base of the tank and also intensity of pressure at the base of the tank.

2. The right limb of a simple U-tube manometer containing mercury is open to the atmosphere, while the left limb is connected to a pipe in which a fluid of specific gravity
0.9 is flowing. The centre of the pipe is 120mm below the level of mercury in the right limb. Find the pressure of fluid in the pipe, if the difference of mercury level in the two limbs is 200mm.

3. a) State a Bernoulli’s theorem.
b) A pipe 300m long has a slope of 1 in 100 and tapers from 1.0m diameter at the higher end to 0.50m at the lower end. The quantity of water flowing is 900lit/sec. If the pressure at the higher end is 70KPa, find the pressure at the lower end.

4. A venturimeter with a 150mm diameter at inlet and 100mm at throat is laid with its axis horizontal and is used for measuring the flow of oil specific gravity 0.9. The oil mercury differential monometer shows a gauge difference of 200mm. Assume coefficient of the meter as 0.98. Calculate the discharge in litres per minute.

5. a) What is an orifice? Mention its different types.
b) A jet of water issues from an orifice of diameter 20mm under a head of 1m.What is the ‘Cd’ for the orifice, if actual discharge is 0.85lit/sec?

6. a) List the advantages of a triangular notch over a rectangular notch.
b) During an experiment in a laboratory, 280lit of water flowing over a right angled triangular notch was collected in one minute. If the head of water over the sill is 100mm, calculate the ‘Cd’ of the notch.

7. a) Differentiate between a notch and a weir.
b) A Trapezoidal notch of 1.2m wide at top and 0.45m at bottom is 0.3m high. Find the discharge through notch if head over notch is 225mm.Take Cd=0.6

8. a) State Darcy’s equation for determination of loss of head due to friction in pipe.
b) A reservoir has been built 4km away from a new extension area having 5000 population. Water is to be supplied from the reservoir to the new extension area. It is estimated that each person will consume 200litres of water per day, and that half of the daily supply is pumped within 10hours.Calculate the size of the supply main, if the loss of head due to friction in the pipeline is 20m.Take co-efficient of friction for the pipe line is 0.008

9. a) Define most economical channel section.
b) Calculate the bed slope of trapezoidal channel of bed width 9m,depth of flow 1.2m and side slope 2H to 1V if the discharge is 8 m3/s and Chezy’s constant C=50.

10. a) With a neat sketch explain the main parts of a Reciprocating pump.
b) Write any five differences between impulse turbine and reaction turbine.
MODEL QUESTION BANK

CO I : Fluids, pressure & its measurements and hydrostatics

Cognitive level –Remember

1. What is meant by pressure head? Derive an expression for it.
2. State the different principles of measurement of pressure.
3. Define the density of a liquid.
4. Define atmospheric pressure, gauge pressure, absolute pressure.
5. What is Manometer? Mention types of manometer.
6. State the difference between simple and differential manometer.
7. Define total pressure, centre pressure.

Cognitive level -Understand

8. Distinguish between gauge pressure and absolute pressure
9. Differentiate between specific weight and specific gravity of an oil.
10. Distinguish between compressibility and capillarity of water.
11. What do you understand by the term intensity of pressure? State its units.

Cognitive level -Application
12. A simple Manometer containing mercury is used to measure the pressure of water flowing in a pipe line. The mercury level in the open tube is 60mm higher than that in the left tube. If the height of water in the left tube is 500mm, determine the pressure in the pipe in terms of head of water.
13. A differential Manometer connected at the two points A and B at the same level in a pipe containing an oil of specific gravity 0.85, shows a difference in mercury level as 150mm.Determine the difference in pressure at the two points, the level of mercury in the left limb is lower than that in the right limb.
14. Determine the total & centre of pressure on an isosceles triangular plate of base 4m and altitude 4m, when it is immersed vertically in an oil of Sp.Gr. 0.9.The base of the plate coincides with the free surface of oil.
15. Find the intensity of pressure on diver working, at a depth of 200m under the sea, if the specific gravity of sea water is 1.025.

Cognitive level –Remember

1. Define Bernoulli’s theorem.
2. Give the equation for continuity of flow.
3. State the limitations of Bernoulli’s theorem.
4. 4.Draw a neat sketch of Ventuimeter and name the parts.
5. What is Venturimeter?

Cognitive level -Understand

6. State the difference between uniform flow and non uniform flow & steady and unsteady flow.

Cognitive level -Application
7. A circular pipe of 250mm diameter carries an oil of specific gravity 0.8 at the rate of 120lit/sec and under a pressure of 20kpa.Calculate the total energy in meters at point which is 3m above datum line.
8. Water is flowing through a pipe of 100mm diameter with an average velocity of 10m/s. Determine the rate of discharge of the water in litres/salsa determine the velocity of water at the other end of the pipe, if the diameter of the pipe is gradually changed to 200mm.
9. A venturimeter with a 150mm diameter at inlet and 100mm at throat is laid with its axis horizontal and is used for measuring the flow of oil specific gravity 0.9. The oil mercury differential monometer shows a gauge difference of 200mm.Assume coefficient of the meter as 0.98. Calculate the discharge in litres per minute.
10. A pipe 300m long has a slope of 1 in 100 and tapers from 1m at the higher end to 0.5m at the lower end. Discharge through pipe is 5400litre per minute, if pressure at the higher end is 70KN/m2, find the pressure at the lower end.

Cognitive level –Remember

1. Define veena contracta.
2. What is an orifice? Give the classification.
3. Define Hydraulic coefficients and give the relation between them.
4. List the types of notches.
5. List the advantages of a triangular notch over a rectangular notch.

Cognitive level -Understand

6. Differentiate between a notch and a weir.
7. What is a cipplottei weir? How does it differ from a rectangular weir?

Cognitive level -Application
8. A right angled V-notch was used to measure the discharge of a pump if the depth of water over the notch is 200mm,calculate the discharge if Cd=0.62.
9. A Trapezoidal notch of 1.2m wide at top and 0.45m at bottom is 0.3m high. Find the discharge through notch if head over notch is 225mm.Take Cd=0.6.
10. A weir, 8m long is to be built across a rectangular channel to discharge a flow of 9m3/sec. If the maximum depth of water on the upstream side of the weir is limited to 2mts maximum, what must be the height of the weir? Take Cd=0.62.
11. A jet of water issues from an orifice of diameter 20mm under a head of 1m.What is the ‘Cd’ for the orifice, if actual discharge is 0.85lit/sec?

Cognitive level –Remember

1. List the types of losses in the pipe flow.
2. Give the Darcy’s formula for head loss due to friction.
3. What is water hammer?
4. What is hydraulic mean depth?
Cognitive level -Understand

5. Explain Hydraulic gradient line & Total energy line with neat sketch.
6. Explain the surge tank with sketch.
Cognitive level -Application
7. A town having a population of 100000 is to be supplied with water from a reservoir at 5km distance. It is stipulated that one half of the daily supply 150lts/head should be delivered within 8. Hour that must be the size of the pipe to furnish the supply, if head available is 12m and C=45.

Cognitive level –Remember

1. Give the Chezy’s formula and Manning’s formula.
2. State the conditions of the most economical section of a rectangular and Trapezoidal channel.
Cognitive level –Understand

3. Explain the term open channel & list the various types of open channels.

Cognitive level -Application
4. A rectangular channel has a cross section of 50m2.Determine the discharge through the most economical section, if bed slope is 1 in 1000 take Chezy’s constant C=52.5.
CO VI : Understand the principles of pumps and Turbines

Cognitive level –Remember

1. What are the different types of pumps?
2. What is a turbine?
3. How turbines are classified?
Cognitive level -Understand

4. Explain the working principle of a centrifugal pump with sketch.
5. Explain the working principle of a reciprocating pump with sketch.