  # ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2014

Instructions

For the following questions answer them individually

Question 1

# The condition of stable equilibrium fora floating body is: Question 2

# The thickness of turbulent boundary layer at a distance x from the leading edge overa flat plate vvaries as Question 3

# The diameters of a pipe at the sections 1 and 2 are 10 cm and 15 cm respectively. Velocity of water flowing through the pipe at section 1 is 5 m/s. velocity at section 2 in m/s and discharge in cmm is Question 4

# The velocity distribution for flow over flat plate is given $$u = \frac{3}{4}y - y^2$$ in which u is the velocity in m/s at a distance y meter above the plate. Shear stress at $$y = 0.15 m$$ is (Take $$\mu$$ for fluid = 8.5 poise) Question 5

# A gas weighs 16 N/m$$^3$$ at 288 K and at an adiabatic pressure of 25 N/cm$$^2$$. Its gas constant is Question 6

# A pipe line AB of diameter 30 cm and of length 400 m carries water at the rate of 50 liters/sec. The flow takes place from A to B where point B is 30 meters above A. Pressureat B is 2 ksc. Pressure at Ais (Take f = 0:008) Question 7

# A nozzle is fitted at the end of a pipe of length 300m and of diameter 10 cm for transmitting water. What is the diameter of the nozzle considering maximum transmissionof powerthrough the nozzle (f = 0.009) Question 8

# A turbine develops 500 kW under a head of 100 meters at 200 RPM.Its normal speed and powerunder a head of 81 meters Question 9

# Number of degrees of freedom in a Ball and socket joint: Question 10

# Two inelastic spheres of masses 10 kg each move with velocities of 15m/s and 5m/s respectively in the same direction. The loss in kinetic energy when theycollide OR