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BARC 2021 ME: Fluid mechanics & Machinery Nuclear Quiz 1

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Question 1

A simple and accurate viscometer can be made from a length of capillary tubing. If the flow rate and pressure drop are measured, and the tube geometry is known, the viscosity of Newtonian liquid can be computed. A test of a certain liquid in a capillary viscometer gave the following data:
Flow rate: 880 mm3/s, Tube length: 1 m, Tube diameter: 0.50 mm, Pressure drop: 1.0 MPa
The viscosity of liquid will be (), assuming the flow to be laminar.

Question 2

If H is the head available at nozzle entry and is the Coefficient of velocity, the head loss in the nozzle is given by

Question 3

The effect of Cavitations is due to:

Question 4

The Newtonian fluid has the following velocity fields: .  The rate of shear deformation at εyz the point X=–3, Y=–2 and Z=3 for the given flow is ___________.

Question 5

The velocity components in x and y direction are given by u = λxy3 - x2y; v = xy2 – 3/4 y4. The value of λ for a possible flow field involving an incompressible fluid is:

Question 6

If the surface tension of water in contact with air is 0.075 N/m, the correction (in mm) need to be applied towards capillary rise in the manometric reading in tubes of 2.5 mm diameter will be ____.

Question 7

A liquid with specific gravity of 0.94 undergoes a reduction in volume of 0.22% when subjected to an increase in pressure of 1400 kPa. The velocity of propagation of sound in this liquid will be ___________m/s.

Question 8

A turbine is working under a head of 200 m. The power developed by the turbine is 100 kW and discharge through the turbine is 0.125 m3/s. In such a case, the ratio of unit power to unit discharge for the turbine will be ____.

Question 9

A centrifugal pump is designed to handle a head of 60m  under atmospheric condition. If vapour pressure of the water is 4.25 kPa at atmospheric condition and Thoma’s cavitation factor is 0.12, then NPSH will be (in m)

Question 10

The velocity of water at the inlet and outlet sections of a draft tube are 8 m/s and 2 m/s respectively. If frictional losses in the draft tube are 0.6 m, the efficiency of the draft tube is?
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