The- most efficient method of compressing air is to compress it :
A. isothermally
B. adiabatically
C. is entropically
D. isochronically
E. as per law pV
In a forced vortex, the velocity of flow everywhere within the fluid is :
A. maximum
B. minimum
C. zero
D. non-zero finite
E. unpredictable
For pipes, laminar flow occurs when Roynolds number is :
A. less than 2000
B. between 2000 and 4000
C. more than 4000
D. less than 4000
E. none of the above
The fluid forces considered in the Navier Stokes equation are :
A. gravity, pressure and viscous
B. gravity, pressure and turbulent
C. pressure, viscous and turbulent
D. gravity, viscous and turbulent
E. none of the above
The work done per unit mass of air in compression will 'be least when n is equal to :
A. 1
B. 1.2 ,
C. 1.3
D. 1.4
E. 1.5
What will be the volume of air at 327°C if its volume at 27°C is 1.5 m3/mt ?
A. 3 m3/mt
B. 1.5 m3/mt
C. 18 m3/mt
D. 6 m3/mt
E. 0.75 m3/mt
Inter cooling in compressors :
A. cools the delivered air
B. results in saving of power in compressing a given volume to given pressure
C. is the standard practice for big compressors
D. enables compression in two stages
E. prevents compressor jacket running very hot
Standard air is the air at :
A. atmospheric conditions at any specific location
B. 20°C and 1 kg/cm2 and relative humidity 36%
C. 0°C and standard atmospheric conditions
D. 15°C and 1 kg/cm2
E. 25°C, 1 kg/cm2 and RH of 60%.
Maximum work is done in compressing air when the compression is :
A. isothermal
B. adiabatic
C. polytropic
D. any one of the above
E. none of the above
