The density of a gas at N.T.P.is ‘ρ’. Keeping the pressure constant (i.e. 760 mm Hg), the 3 density of the gas will become ¾ 0.75 ρ at a temperature of ____________ °K?

Related Mcqs:

1. Answer: Option B 392. Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27°C, the temperature should be raised to _____________ °C?

   A. 270
   B. 327
   C. 300
   D. 540

2. 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

3. Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is__________________?

   A. Inversely proportional to viscosity of gas
   B. Proportional to the viscosity & density of the gas
   C. Proportional to the pressure of the gas
   D. Both B. and C.

4. Fugacity of a component in an ideal gas mixture is equal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at constant pressure and temperature ____________ as its mole fraction increases?

   A. Decreases
   B. Decreases exponentially
   C. Increases
   D. Remain constant

5. At a constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to___________________?

   A. Decrease in mean free path
   B. Increased collision rate among molecules
   C. Increase in molecular attraction
   D. Increase in average molecular speed

6. A gas at 0°C was subjected to constant pressure cooling until its volume became half the original volume. The temperature of the gas at this stage will be________________?

   A. 0°C
   B. 0°K
   C. -136.5°C
   D. -136.5°K

7. The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called the ____________ temperature?

   A. Critical
   B. Boyle
   C. Inversion
   D. Reduced

8. In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in_____________?

   A. Enhanced COP
   B. Decreased COP
   C. No change in the value of COP
   D. Increased or decreased COP; depending upon the type of refrigerant

9. Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in__________________?

   A. Increased COP
   B. Same COP
   C. Decreased COP
   D. Increased or decreased COP; depending upon the type of refrigerant

10. The vapour pressure of water is given by, in Psat = A – (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K. The vapor pressure of water in atm. at 50°C is approximately__________________?

    A. 0.07
    B. 0.09
    C. 0.11
    D. 0.13