B.TECH - Semester 4 fluid machinery Question Paper 2020 (sep)
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- A Francis turbine with an overall efficiency of $70 \%$ is required to produce 147.15 kW . it is working under a head of 8 m . The peripheral velocity $=0.30 \sqrt{2 g H}$ and the radial velocity of flow at inlet is $0.96 \sqrt{2 g H}$. The wheel runs at 200 rpm and the hydraulic losses in the turbi...
- A Francis turbine with an overall efficiency of $70 \%$ is required to produce 147.15 kW . it is working under a head of 8 m . The peripheral velocity $=0.30 \sqrt{2 g H}$ and the radial velocity of flow at inlet is $0.96 \sqrt{2 g H}$. The wheel runs at 200 rpm and the hydraulic losses in the turbi...
- A Francis turbine with an overall efficiency of $70 \%$ is required to produce 147.15 kW . it is working under a head of 8 m . The peripheral velocity $=0.30 \sqrt{2 g H}$ and the radial velocity of flow at inlet is $0.96 \sqrt{2 g H}$. The wheel runs at 200 rpm and the hydraulic losses in the turbi...
- A Francis turbine with an overall efficiency of $70 \%$ is required to produce 147.15 kW . it is working under a head of 8 m . The peripheral velocity $=0.30 \sqrt{2 g H}$ and the radial velocity of flow at inlet is $0.96 \sqrt{2 g H}$. The wheel runs at 200 rpm and the hydraulic losses in the turbi...
- (b) Derive an expression for specific speed of a pump.
- (a) What is an air vessel? Describe the function of the air vessel for reciprocating pump. Explain how the work is saved by fitting an air vessel.
- What is a hydraulic intensifier?
- (a) Two centrifugal pumps running at the same speed of 1440 rpm are geometrically similar. One pump having an impeller diameter 0.05 lifts 20 liters per second of water of water against a head of 15 m . If the discharge of the second pump is 10 liters per second, find the impeller diameter and head ...
- Define static head and manometric head of a centrifugal pump.
- (a) The diameter and stroke of a single acting reciprocating pump are 10 cm and 20 cm respectively. The pump is fed by a suction pipe 5 cm in diameter and 6 m long; the suction lift being 3 m . What is the maximum speed at which pump can be run without separation in the suction pipe? Given that sepa...
- Define bydrodynamic force. How is it different from hydrostatic force?
- What are the difference between impulse and reaction turbine?
- What is the reason for using Pelton turbine when the head available is high?
- What is the function of a vortex chamber in a volute type centrifugal pump?
- Differentiate between a single-cylinder and double-cylinder reciprocating pump.
- What are the applications of reciprocating compressors?
- What are the advantages of multi-stage compression?
- What are the applications of Roots blower? Answer one full question out of the two from each module.
- (a) A water jet of diameter 60 mm and velocity $25 \mathrm{~m} / \mathrm{s}$ strikes a flat plate inclined at an angle $25^{\circ}$ with the axis of the jet.
- (i) Find the force exerted by the jet on the plate and the component of force in the direction normal to the jet if the plate is stationary. Also find the ratio with which the discharge gets divided after striking the plate. (ii) Find the force exerted on the plate and the work done per unit time by...
- (b) Find an expression for maximum hydraulic efficiency of a Pelton wheel.
- (a) An open circular cylinder of 15 cm diameter and 100 cm long contains water upto a height of 70 cm . Find the speed at which the cylinder is to be rotated about its vertical axis, so that the axial depth becomes zero.
- (b) A centrifugal pump running at 1200 rpm has internal and external impeller diameters of 0.2 m and 0.4 m respectively. Velocity of flow is constant and water enters the impeller radially. The vane angles at inlet and outlet are $20^{\circ}$ and $30^{\circ}$, respectively. Find out the work done by...
- (b) Explain the effect of acceleration in suction and delivery pipes.
- (b) Explain jet pumps with neat sketch. 17．（a）A reciprocating compressor delivers 5 kg of air per minute at a pressure of $7.5 \mathrm{kgf} / \mathrm{cm}^{2}$ ．The pressure and temperature of the air before compression are $1 \mathrm{kgf} / \mathrm{cm}^{2}$ and $15^{\circ} \mathrm{C}$ ，respectively...
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