At critical point the enthalpy of vaporisation is
A.Only dependent on temperature
B.Zero
C.Maximum
D.Minimum
E.None of the above
Category: Thermodynamics Mcqs
If the temperature of the source is increased, the efficiency of the Carnot engine
A.Decreases
B.Increases
C.Does not change
D.Will be equal to the efficiency of a practical engine
E.Depends on their factors
Which of the following does not change during an-ideal throttling process?
A.Enthalpy
B.Enthalpy and temperature
C.Temperature and pressure
D.Pressure and volume
E.Pressure, volume and temperature
In case of a four cylinder diesel engine, the heat carried away by exhaust gases will be
A.5 to 7 percent
B.7 to 10 percent
C.10 to 20 percent
D.25 to 35 percent
E.50 to 70 percent
The total radiant energy emitted by a plane surface per unit area and unit time is called
A.Radiant flux density
B.Total absorptivity
C.Radiant energy
D.Radiant intensity
E.None of the above
If the roof of a house is replaced by a shiny metallic surface the temperature inside will
A.Increase
B.Remain unaltered
C.Decrease
The specific heat at constant volume of solids obeys Deby’s T3 law
A.at high pressures
B.at low pressures
C.at low temperatures
D.at all temperatures
If molar Cp = 4.97 then
A.Cv = 2.97
B.Cv = 1.97
C.Cv = 5.97
D.Cv = 0.97
E.Cv = 0.597
The mean free path of a gas molecule increases with
A.increase in temperature
B.decrease in temperature
C.increase in density
D.increase in pressure
The temperature of a gas is a measure of
A.the average kinetic energy of the gaseous molecules
B.the average distance between the molecules of the gas
C.The average potential energy of the molecules
D.None of the above
