Top 250+ Solved Engineering Thermodynamics MCQ Questions Answer
Q. Which of the following is true about compressibility of real gases?
a. z = 1
b. z < 1
c. z > 1
d. both z < 1 and z > 1 view answer
Q. 1 mole of cyclohexane (z = 1.2) is filled in a container at 27oC and 4 atm, what is the volume of container?
a. 3.8 liter
b. 4.4 liter
c. 5.6 liter
d. 7.4 liter view answer
Q. When humidity ratio of air air is said to be dehumidified.
a. increases
b. decreases
c. remains constant
d. none of the mentioned
Q. The degree of saturation is the ratio of
a. (saturated specific humidity / actual specific humidity)^2
b. 1/(saturated specific humidity * actual specific humidity)
c. saturated specific humidity / actual specific humidity
d. actual specific humidity / saturated specific humidity
Q. At any dbt, the the difference of wbt reading below below dbt, is the amount of water vapour held in mixture.
a. smaller, smaller
b. greater, greater
c. greater, smaller
d. smaller, greater
Q. When unsaturated air flows over a sheet of water in an insulated chamber
a. specific humidity of air decreases
b. the water evaporates
c. both air and water are cooled during evaporation
d. all of the mentioned
Q. The main cause of the irreversibility is
a. a) mechanical & fluid friction
b. b) unrestricted expansion
c. c) heat transfer with a finite temperature difference
d. d) all of the above
Q. An isentropic process is always
a. a) irreversible & adiabatic
b. b) reversible & isothermal
c. c) frictionless & irreversible
d. d) reversible & adiabatic
Q. For a reversible adiabatic process, thechange in entropy is
a. a) zero
b. b) minimum
c. c) maximum
d. d) infinite
Q. For any reversible process, the change in entropy of the system & surroundings is
a. a) zero
b. b) unity
c. c) negative
d. d) positive
Q. For any irreversible process the netentropy change is
a. a) zero
b. b) positive
c. c) negative
d. d) infinite
Q. The processes of a Carnot cycle are
a. a) two adiabatic & two constant volume
b. b) one constant volume &one constant pressure & two isentropies
c. c) two adiabatics & two isothermals
d. d) two isothermals & two isentropies
Q. Isentropic flow is
a. a) irreversible adiabatic flow
b. b) ideal fluid flow
c. c) reversible adiabatic flow
d. d) frictionless reversible flo
Q. In a carnot engine, when the working substance gives heat to the sink
a. a) the temperature of the sink increases
b. b) the temperature of the sink remains the same
c. c) the temperature of the source decreses
d. d) the temperature of the source decrease