The value of y = cp/cv. at < 500°C for air & most common gases can be safely assumed to be_____________________?

Related Mcqs:

1. Specific gravity of a metal, which weighs 5 kg in air and 4 kg when submerged in water, will be_____________________?

   A. 5
   B. 1.25
   C. 2.5
   D. 3.75

2. A thin, flat & square plate measuring 2 m × 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2. The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is ________________ W/m2 °C ?

   A. 50
   B. 100
   C. 150
   D. 200

3. For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3) while the C.V. is same on weight basis (i.e., kcal/kg) ?

   A. Propane and acetylene
   B. Propane and LPG
   C. Sewage gas and gobar gas
   D. B.F gas and coke oven gas

4. The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be_______________?

   A. Parabolic
   B. Hyperbolic
   C. Straight line
   D. None of these

5. Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about ____________________?

   A. 9 : 1
   B. 17 : 1
   C. 23 : 1
   D. 29 : 1

6. Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be________________?

   A. 9.5 : 1
   B. 12.5 : 1
   C. 15.5 : 1
   D. 18.5 : 1

7. _____________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C ?

   A. Borosilicate
   B. High silica
   C. Supermax
   D. Lead

8. In case of compression of one kg of air, the work done will be the least, when the value of polytropic index ‘n’ is______________________?

   A. 1
   B. 1.4
   C. 1.5
   D. Y = Cp/Cv

9. Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of ______________ will facilitate the most accurate measurement of the temperature ?

   A. Copper
   B. Steel
   C. Aluminium
   D. Brass

10. Which of the following gases cause global warming ?

    A. Carbon monoxide
    B. Carbon dioxide
    C. Nitrogen
    D. Ozone