A. Save power in compressing a given volume to a given pressure
B. Cool the delivered air
C. Achieve the exact delivery pressure
D. None of these
Related Mcqs:
- For very low pressure and high discharge rate, the compressor used is a/an ______________ compressor?
A. Axial
B. Reciprocating
C. Rotary
D. None of these - The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost is P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet ?
A. P, Q and R
B. P and R
C. R and S
D. P, Rand S - Multistage compressors are used in industry, because they____________________?
A. Reduce the cost of compressor
B. Reduce the size requirement
C. Resemble closely to isothermal compression
D. Are easy to control - Multistage centrifugal pumps are generally used for________________?
A. High head
B. Low head but high discharge
C. Highly viscous liquid
D. Slurries of high solid concentration - Horsepower increase of a centrifugal gas compressor without altering the volumetric flow rate will _____________ the gas discharge pressure?
A. Increase
B. Decrease
C. Not change
D. Exponentially decrease - With increase in molecular weight of the gas, the head developed by a centrifugal compressor will________________?
A. Decrease
B. Increase
C. Remain same
D. Unpredictable - The maximum delivery pressure of a reciprocating compressor may be about ______________ kg/cm2?
A. 1000
B. 2000
C. 3000
D. 4000 - Purpose of air lift pump is to____________________?
A. Compress air
B. Lift compressed air
C. Lift water from a well by using compressed air
D. Lift air under negative pressure - If Blasius or Darcy friction factor is ‘f1’ then the Fanning friction factor is equal to____________________?
A. f1/4
B. 4f2
C. 2f1
D. f1/2 - For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poisseule equation predicts the volumetric flow rate to be proportional to____________________?
A. R
B. R2
C. R4
D. R0.5
