The maximum delivery pressure of compressors can be upto _____________ atmospheres?

Related Mcqs:

1. The maximum delivery pressure of a reciprocating compressor may be about ______________ kg/cm2?

   A. 1000
   B. 2000
   C. 3000
   D. 4000

2. 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

3. 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

4. Centrifugal compressors compared to reciprocating compressors__________________?

   A. Require less space
   B. Have quieter operation
   C. Have lower operating costs
   D. All A., B. and C.

5. The location of centre of pressure, which defines the point of application of the total pressure force on the surface, can be calculated by applying the principle of moments according to which “sum of the moment of the resultant force about an axis is equal to the sum of the components about the same axis”. The centre of pressure of a rectangular surface (of width ‘w’) immersed vertically in a static mass of fluid is at a depth of (where, y = depth of the liquid) ?

   A. 1/(y/3)
   B. 2y/3
   C. 1/(y/4)
   D. 3y/4

6. In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the _____________ efficiency?

   A. Manometric
   B. Mechanical
   C. Volumetric
   D. Overall

7. An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonian fluid beyond yield stress. Which of the following is an ideal plastic ?

   A. Sewage sludge
   B. Rubber latex
   C. Blood
   D. Sugar solution

8. Upto what value of ‘Mach number’, a fluid may be considered as incompressible ?

   A. 0.03
   B. 0.3
   C. 3
   D. 10

9. While starting a centrifugal pump, its delivery valve should be kept___________________?

   A. Opened
   B. Closed
   C. Either opened or closed; it does not make any difference
   D. Either opened or closed; depending on the fluid viscosity

10. Liquid delivery by centrifugal pump starts, only when the head developed by it is equal to the ____________ head?

    A. Manometric
    B. Total
    C. Static
    D. Friction