Fluid Mechanics and Hydraulic Machines 1st. Edition by S. C. Gupta | 9788177583649 | 8177583646

Hydraulic, Fluid Mechanics

Fluid Mechanics and Hydraulic Machines

176 SOLVED PROBLEMS

Question: 9.2.3

A centrifugal pump lifts water under a static head of 36 m of water of which 4 m is suction lift. Suction and delivery pipes are both 150 mm in diameter. The head loss in suction pipe is 1.8 m and in delivery pipe 7 m. The impeller is 380 mm in diameter and 25 mm wide at mouth and revolves at 1200 ...

Verified Answer:

Refer section 9.2.1 for various heads used in the ...

Question: 9.4.6

A Kaplan turbine working under a head of 10 m and at a design speed of 250 rpm has a flow rate of 24 m³/s. The diameter of the runner and hub are 2 m and 1 m, respectively. The inlet and outlet diameter of the draft tube are 2 m and 3 m, respectively. The pressure recorded at inlet of the draft ...

Verified Answer:

Given:

Q = 24 m^3/s, N = 250 \ \mathrm{rp...

Question: 10.4.2

It is required to transmit 36.75 kW power from an accumulator through a pipeline of 10 cm diameter and 1500 m long. The ram is loaded with a weight of 1250 kN and the friction loss in the pipeline equals 2.5% of the total power being transmitted. Work out the diameter of the ram if the friction ...

Verified Answer:

Given: P = 36.75 kW, d = 0.1 m, L = 1500 m, W = 12...

Question: 10.6.1

A hydraulic lift is required to lift a load of 12 kN through a height of 10 m, once in every 1.75 minutes. The speed of the lift is 0.75 m/s. During the working stroke of the lift, water from the accumulator and the pump at a pressure of 400 N/cm² is supplied to the lift. If the efficiency of the ...

Verified Answer:

Given:

W = 12 kN, H = 10 m, t = 1.75 \m...

Question: 10.4.1

The total weight including the self-weight of ram placed on the sliding ram of a hydraulic accumulator is 40 kN. The diameter of the ram is 500 mm. If the frictional resistance against the movement of the ram is 5% of the total weight, determine the intensity of pressure of water when (i) the ram ...

Verified Answer:

Given: W = 40 kN, D = 0.5 m → A = 0.1963 m², frict...

Question: 10.5.1

The efficiency of a hydraulic crane, which is supplied water under a pressure of 70 N/cm² for lifting a weight through a height of 10 m, is 60%. If the diameter of the ram is 150 mm and velocity ratio 1/6, find (i) the weight lifted, and (ii) the volume of water required in litres to lift the ...

Verified Answer:

Given:

η_c = 0.6, p = 7 × 10^5 N/m^2, x ...

Question: 10.6.2

An accumulator maintains a steady pressure of 8 Mpa in a 7.5 cm hydraulic main. A hydraulic lift is supplied with pressure water from the main and the point at which the supply to the lift is drawn off is at a distance of 600 m from the accumulator. The ram of the lift is 20 cm in diameter and the ...

Verified Answer:

Given:

p = 8 × 10^6 N/m^2, d = 0.075 m, ...

Question: 10.7.1

A hydraulic press has a ram of 200 mm diameter and a plunger of 30 mm diameter. It is used for lifting a weight of 3 kN. Find the force required at the plunger. How much force will be required at the end of a lever, if used, having the ratio l/L = 1/10. If the stroke of the plunger is 100 mm find ...

Verified Answer:

Given:

A = 0.7854 × 0.2^2 = 0.0314 m^2, a...

Question: 10.9.1

The water is supplied at the rate of 3000 l/min from a height of 4 m to a hydraulic ram, which raises 300 l/min to a height of 30 m from the ram. The length and diameter of the delivery pipe is 100 m and 70 mm respectively. Calculate the efficiency of the hydraulic ram if the coefficient of ...

Verified Answer:

Given:

Q = 3000 \ l/\min = 0.05 m^3/s, q ...

Question: 10.9.2

The supply pipe in a hydraulic ram installation is 60 mm in diameter and 4 m in length. The waste valve is 130 mm diameter having an effective lift of 6.5 mm and a weight of 13.25 N; it makes 125 beats per minute. Find the discharge through the delivery pipe per minute against a delivery head of 8 ...

Verified Answer:

Given: d = 0.06 m, L = 4 m, valve weight = 13.25 N...