Top 350+ Solved Thermodynamics MCQ Questions Answer
Q. The mean free path of a gas least depends on
a. volume of gas
b. viscosity of gas
c. Pulsejet
d. density of gas
e. pressure of gas
Q. The value of universal gas constant in S.I. units is
a. 831.4 J/kg mole/?k
b. 8314 J/kg mole/?k
c. 8.314 J/kg mole/?k
d. 83.14 J/kg mole/?k
e. 0.8314 J/kg mole/?k
Q. Which of the following valve is installed between the boiler and the feed pump?
a. Flow of cock
b. Pulsejet
c. Steam stop valve
d. Throttle valve
e. Feed check valve
Q. Thermodynamic equilibrium is completely defined by the specifications of
a. Internal energy
b. Enthalpy
c. Generalized displacements
d. All the above together
e. None of the above
Q. A gas (inversion temperature Ti) undergoing Joule Thomson expansion at temperature T will produce cooling effect only when
b. Ti < T
c. Ti > T
d. Pulsejet
e. Ti = T
Q. During an adiabatic expansion, the increase in volume is associated with
a. decrease in pressure and increase in temperature
b. increase in pressure and decrease in temperature
c. Decrease in pressure and decrease in temperature
d. Pulsejet
e. increase in pressure and increase in temperature
Q. The mean free path of a gas molecule increases with
a. increase in pressure
b. increase in density
c. increase in temperature
d. Pulsejet
e. decrease in temperature
Q. In a Carnot cycle the heat is rejected at
a. Constant pressure
b. Constant temperature
c. Constant entropy
d. Constant enthalpy
e. Constant volume
Q. Which of the following statement is incorrect?
a. Total heat of steam is less than the total weight of dry and super saturated steam
b. Total heat of super heated steam is more than the total heat of wet steam
c. Latent heat of steam at critical pressure is zero
d. Latent heat per kg of steam decreases as the pressure of steam increases
e. None of the above
Q. Non-dimensional numbers generally involved in case of heat transfer from horizontal cylinders by natural convection are
a. Reynolds number
b. Nusselt number
c. Prandtl number
d. Grashof number
e. (B), (C) and (D) above
Q. The efficiency of a Rankine cycle may be expected to
a. Increase with decreasing temperature of heat rejection
b. Decrease with decreasing temperature of heat rejection
c. Decrease with increasing temperature of heat rejection
d. Increase with increasing exhaust pressure
e. None of the above
Q. A heat engine works on a Carnot cycle with a heat sink at a temperature of 27?C. The efficiency of the engine is 10%, the temperature of the heat source is
a. 30?C
b. 270?C
c. Temperature shows the extent of expansion
d. 60?C
e. 10?C
Q. All of the following cycles consist of two isentropic processes EXCEPT
a. Otto cycle
b. Stirling cycle
c. Pulsejet
d. Carnot cycle
e. Diesel cycle
Q. A system consisting of more than one phase is known as
a. Isolated system
b. Closed system
c. Non-uniform system
d. Open system
e. Heterogeneous system