Top 250+ Solved Engineering Thermodynamics MCQ Questions Answer
Q. In the reversible polytropic process the value of exponent n varies between
a. a) 0.2 to 1
b. b) 1.0 to 1.2
c. c) 1.2 to 1.4
d. d) 1.4 to 2.0
Q. An ideal gas as compared to a real gas atvery high pressure occupies
a. a) same volume
b. b) less volume
c. c) more volume
d. d) all of the above
Q. For any irreversible process the netentropy change is
a. a) unity
b. b) infinite
c. c) positive
d. d) negative
Q. Adiabatic & isothermal processes areidentical at
a. a) absolute zerotemperature
b. b) below 0??c temperature
c. c) saturation temperature
d. d) critical temperature
Q. In polytropic process pv?=C the value ofexponent n=±? is indicative of
a. a) isobaric process
b. b) isentropic process
c. c) isochoric process
d. d) throttling process
Q. Entropy in statistical thermodynamics isdefined as
a. a) a universal property
b. b) reversible heat transfer
c. c) degree of randomness
d. d)measure of reversibilityof a system
Q. A mixture of gases expands from 0.03 m³ to 0.06 m³ at a constant pressure of 1 Mpa & absorbs 84 kJ of heat during the process. The change in internal energy ofthe mixture is
a. a) 30 kj
b. b) 54 kj
c. c) 84 kj
d. d) 114 kj
Q. Increase in entropy of a systemrepresents
a. a) increase in availability ofenergy
b. b) increase in temperature
c. c) decrease in pressure
d. d) degradation of energy
Q. Which one of the following pairs best expresses a relationship similar to that expressed in the pair 'pressure-volume' for a thermodynamic system undergoinga process?
a. a) enthalpy-entropy
b. b) pressure-enthalpy
c. c) pressure-temperature
d. d) temperature-entropy
Q. Variations of pressure & volume atconstant temperature are correlated through
a. a) charle\s law
b. b) boyle\s law
c. c) gas law
d. d) gay lussac\s law
Q. The relationship between pressure & volume is expressed as pv?=const. Selectwrong statement
a. a) expansion with n=0 is a constant pressure process
b. b) expansion with n=? is an adiabatic process
c. c) expansion with n=? is not possible
d. d) expansion at constant temperature has n=1
Q. A gas expands from initial condition of (p1, v1, T1) to final condition (p2, v1, T2), then according to Charle's law:
a. a) p1t1=p2t2
b. b) p1p2 = t1t2
c. c) p1+ t2 = p2 + t1
d. d) p1t2 = p2t1
Q. Air expands from initial condition of p1, v1 to final condition of 1/2 p1, 2v1.Choose the correct statement
a. a) no work is performed during expansion
b. b) expansion is isothermal
c. c) expansion is polytropic with n= 1.2
d. d) expansion is adiabatic
Q. Air with initial condition of p1, v1 expands to final condition of p1/2, 3v1.The process is
a. a) hyperbolic
b. b) adiabatic
c. c) polytropic with n > 1
d. d) polytropic with n < 1
Q. The internal energy of a perfect gas is afunction of
a. a) pressure change &temperature
b. b) temperature change &specific heat
c. c) pressure & work supplied
d. d) temperature