Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid flow control. It is caused due to_________________?

Related Mcqs:

1. The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is_________________?

   A. Pipe vibrations
   B. Cavitation
   C. Boundary layer separation
   D. Fluctuation in liquid flow

2. Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about ____________ decibels?

   A. 3
   B. 30
   C. 7
   D. 70

3. Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan_________________?

   A. With greater number of blades
   B. Of increased diameter
   C. Both A. & B.
   D. Neither A. nor B.

4. Methyl isocyanate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of ______________ toxic gas?

   A. Moderately
   B. Highly
   C. Extremely
   D. Very extremely

5. The compressibility factor of a gas is given by (where, V1 = actual volume of the gas V2 = gas volume predicted by ideal gas law)____________________?

   A. V1/V2
   B. V2/V1
   C. V1 – V2
   D. V1.V2

6. The density of a gas ‘X’ is twice that of another gas ‘Y’. If the molecular weight of gas ‘Y’ is ‘M’; then the molecular weight of the gas ‘X’ will be________________?

   A. 2M
   B. M/2
   C. M
   D. M/4

7. An ideal gas is taken around the cycle ABCA as shown in P-V diagram below: The work done by the gas during the cycle is equal to_________________?

   A. 12 P1V1
   B. 6 P1 V1
   C. 3 P1V1
   D. P1 V1

8. The Killer gas which caused Bhopal gas tragedy in 1984 was________________?

   A. Phosgene
   B. Methyl isocyanate (MIC)
   C. Carbon monoxide
   D. Sulphur dioxide

9. Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the___________________?

   A. Nature of the liquid
   B. Nature of the gas
   C. Temperature of the liquid
   D. Total pressure

10. Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules ____________________?

    A. Do not lose energy on collision
    B. Are above the inversion temperature
    C. Do not exert attractive force on each other
    D. Do work equal to loss in kinetic energy