Basic Fluid Mechanics and Hydraulic Machines by Zoeb Husain, Mohd Zulkifly Abdullah, Zainal Alimuddin | 9781441661609 | 1441661603 | Holooly

Basic Fluid Mechanics and Hydraulic Machines [EXP-20421]

97 SOLVED PROBLEMS

Question: 1.2

A 2 mm diameter clean glass tube is inserted in water at 20 °C. Determine the height that the water will rise to capillary action in the tube. The constant angle for water can be taken as zero.

Verified Answer:

A free-body diagram of water is shown in Fig. 1.5....

Question: 2.3

A 50 mm diameter syphon drawing oil of sp. gravity 0.82 from a reservoir is shown in Fig. 2.17. The head loss from point 1 to 2 is 1.5 m and from point 2 to 3 is 2.4 m. Determine flow rate of oil from syphon and also the pressure at point 2.

Verified Answer:

Total head loss from 1 to 3 =

1.5 + 2.4 =3....

Question: 8.7

A centrifugal pump is to be placed over a large open water tank and is to pump water at a rate of 3.5 x 10^(-3) m^3/s. At this flow rate, the value of NPSH given by the manufacturer is 4.5 m. If the water temperature is 15°C and atmospheric pressure .of 10 kPa, determine the maximum height that the

Verified Answer:

Given

Q = 3.5 \times 10^{-3} m^{3}/s ; NPS...

Question: 1.5

A compressed air tank has a volume of 0.85 m^3 . When the tank is filled with a gauge pressure of 3 bar, determine density of air and weight of air in the tank. Assume temperature of air 15°C.

Verified Answer:

Absolute pressure in the tank in kPa

= 3\ti...

Question: 2.14

A deflector shown in Fig. 2.25 moves to the right at 3 m/s while the nozzle remains stationary. Determine the force components needed to move the deflector. The jet velocity is 8 m/s. The nozzle area is 2 cm x 40 cm.

Verified Answer:

Inlet triangle of velocity is a straight line as s...

Question: 2.13

A deflector turns a sheet of water through an angle of 30° as shown in Fig. 2.24. What force is necessary to hold the deflector in place if mass flow rate is 32 kg/s?

Verified Answer:

Mass flow rate in =

32 {kg}/{s}

T...

Question: A.12

A draft tube is a must in :(a) Francis turbine (b) Pelton turbine (c) axial pump (d) Centrifual pump

Verified Answer:

(a) Francis turbine

Question: 2.10

A fire engine pump (shown in Fig. 2.21) delivers water to a nozzle at C located 30 m above the pump at the end of a 100 mm diameter delivery pipe. The pump draws water from a sump at A through a 150 mm diameter pipe. The pump is located at B at a height 2 m above the level of the sump.

Verified Answer:

Applying equation of continuity

Q=a \times ...

Question: 6.5

A Francis turbine has the following data: Flow rate 0.4 m^3/s, head = 92 m, runner speed 1260 rev/min. The guide vane angle 20°, the radius at inlet = 600 mm, width of vanes 30 mm. Determine the shaft power, hydraulic efficiency and specific speeds (wT, NT). Assume radial discharge.

Verified Answer:

given

N = 1260 rpm, Q = 0.4 {m^{3}}/{s},...

Question: 6.2

A francis turbine has the following specifications. Inlet radius 300 mm, outer radius 150 mm, flow rate 0.05 m^3/s, inlet guide blade 30°, angle the absolute velocity at exit makes an angle of 80° with the axis inlet absolute velocity 6 m/s, exit absolute velocity 3 m/s; overall efficiency 80%,

Verified Answer:

Refering to velocity diagrams shown in Fig. 6.15, ...

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