ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2014

An incompressible fluid flows overa flat plate and its boundary layer thickness at certain location is 1mm for Reynolds Numberof 1000. If the velocity is increased by a factorof 4, then the boundarylayer thickness at that location in mm will be

A room contains 35 kg of dry air and 0.5 kg of water vapour. Total pressure and temperature in the room is 100kPa and 298 K.Saturation pressure of water at 298 is 3.17 kPa. Relative humidity of air in that room is

An ideal brayton cycle operating between the pressure limits of 1 bar and 6 bar, has minimum and maximum temperature of 300 and 1500 K. Ratio of specific heat of working
fluid is 1.4. Approximate final temperatures in Kelvin at the end of compression and expansion respectively are

Condition of perfect Vacuumis attained at temperature of

Two identical ball bearings P and Q are operating at loads 15 KN and 45 KN respectively. The ratio of life of bearing P to Q is

If a certain amount of dry ice is mixed with same amount of waterat 80°C, then the final temperature of the mixture is

The leaks in a refrigeration system using Freon is detected using

Presence of moisture in the refrigerant affects the working of

In SI unit, one ton of refrigeration is

On the pressure — enthalpy diagram, condensation and de-superheating is represented by a horizontal line because the process