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779, SAI JOTHI POLYTECHNIC COLLEGE,

ELIYARPATHY, MADURAI 22.

DEPARTMENT OF CIVIL ENGINEERING

21062 - HYDRAULICS Time ! H"#MODEL E$AMINATION M%& M%"'# 7(

PART- A M%"'# 1( & 1 ) 1(A*#+e" %* 1( e#/i*#. A e#/i*# 3%"" e4% m%"'#1. Define the term: fluid2. Differentiate cohesion from adhesion3. What are the types of mechanical pressure gauges?4. Define total pressure5. Distinguish between steady and unsteady flow. What are the limitations of !ernoulli"s theorem ?#. What is an orifice? $ow are orifices classified ?

%. &ention the 'arious minor losses of head of water(. What is the use of a notch ?1). Define crest and nappe.11. What is a weir? $ow are weirs classified ?12. *tate the purpose of spillway in a dam ?13. What is uniform flow and non+uniform flow in open channels14. $ow are canals classified ?15. ,ist the ad'antages of canal lining1. Define the term- ritical Depth- with respect to open channel flow.1#. What is the principal source of ground water?1%. Define /0uifer1(. Differentiate pump and turbine.

2). What is meant by centrifugal pump ?

PART- 5 M%"'# ( & 12 ) 60/nswer all uestions choosing either di'ision / or di'ision ! of each 0uestion.

i /ll di'isions carry e0ual mars.

21. Ai / capillary tube of diameter 2.51)+3m is dipped in water. 6he surface tension at thecontact surface is #3.51)+378m. 9f the angle of contact is 25) determine the capillary rise. ii6he pressure of water at a point in a pipe line is 578m2. What is the correspondingpressure head in terms of water ? What is the corresponding pressure head in terms oferosene of specific gra'ity ).%.

OR

5i 6o measure the pressure at a point in a pipe line carrying water a sensiti'e manometerha'ing a basin of area ) times the area of the tube is employed. 6he deflection of mercurybetween the limbs is ).()m. 6he mercury is ).3m below the centre of pipe in the basin.Determine the pressure head in terms of water. ii / triangular plate of base 3m and altitude 4m is immersed in a li0uid of specific ).%. 9tsbase is parallel to and at a depth of 1m from the free li0uid surface. 9ts plane maes 3))to the free surface. 9ts base is nearer to the free li0uid surface. ompute 1 6otalpressure on one side of the plate and 2 Depth of centre of pressure.

22 Ai / hori;ontal pipe line of 1))mm diameter discharges under a pressure of 343.41)3ind 1 coefficient of discharge 2 coefficient of 'elocity and3 coefficient of contraction.

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OR5 i / rectangular orifice 2m wide and 4m deep is discharging water from a tan. 6he waterle'el is 1)m abo'e the upper edge of the orifice. 6aing d)..>ind the discharge.ii / pipe line connects two reser'oirs whose difference in water le'el is 15m. 6he length ofthe pipe is ))m. 9f the discharge is 3)) lps find the diameter of the pipe line taing 8 as ).)2.

2! Ai / triangular notch is discharging under a head of ).#m. 9f the coefficient of discharge ofthe notch is ).)find the discharge. /ngle of the notch is )).ii / trape;oidal notch ))mm wide at the bottom has side slopes 1:1. 9f the discharge o'erthe notch is 3)) lps determine the head causing flow o'er the sill of the notch. 6ae das ).2.

OR5 i / weir1)m long is di'ided into 4 bays by 'ertical posts each 3))mm wide. Determine thedischarge if the head of water o'er the weir is 1m. 6ae d as ).).ii Determine the discharge o'er a sharp crested weir of length 2)m under a constant headof ).1)m. 6ae d as ).).

2A i alculate the hydraulic mean depth for a rectangular channel ha'ing a bottom width of2m and depth of flow 1.#5m.ii Design an economical rectangular channel to carry ()m38s with a bed fall of 1 in 15)). 9nthe he;y"s formula 5).

OR5 i Design a most economical rectangular section to carry ).3)m38s for a bed slope of 1 in1))). 6ae ).ii /n economical trape;oidal channel has a bed width of 4m and side slopes of 1:1. 9t has abed fall of 1 in 1)). 6aing as ) determine the discharge.

2( A i *tate 'arious methods of tapping ground water. ii @i'e a brief note on ABpen wells-.

OR5 i What are the different types of heads for a centrifugal pump? ii / centrifugal pump installed in a well for irrigation pumps 24))litres of water per minuteto a height of 25m through 12)m long and 15)mm diameter pipe. 6he o'erall efficiency of thepump is )C. 6aing friction factor as ).)4 calculate the power re0uired to dri'e the pump.

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