Top 350+ Solved Thermodynamics MCQ Questions Answer
Q. The melting point of ice
a. Pulsejet
b. decreases with increase in atmospheric pressure
c. increases with increase in atmospheric pressure
d. is independent of atmospheric pressure
Q. In an isothermal process change in internal energy
a. Depends on the friction and other factors
b. Becomes zero
c. Remains constant
d. Decreases
e. Increases
Q. When two gases are not under the same conditions of temperature and pressure, upon mixing there will be
a. loss of entropy to the surroundings
b. exchange of entropy between the two gases
c. increase in available heat but decrease in unavailable heat
d. None of the above
e. Pulsejet
Q. The dew point temperature of humid air is
a. the temperature of air obtained on cooling it till saturation at constant volume
b. Pulsejet
c. always higher than the wet bulb temperature
d. the temperature of air obtained on cooling it till saturation at constant pressure
e. never lower than the wet bulb temperature
Q. Which one of the following is heterogeneous system
a. Cooking gas in a cylinder
b. The cooling fluid in the radiator
c. A mixture of hydrogen and oxygen
d. Atmospheric air
e. A mixture of ice, water and system.
Q. The value of characteristic gas constant for carbon dioxide would be
a. 19.28 kg/metre/kg/?K
b. 30.4 kg/metre/kg/?K
c. 29.2 kg/metre/kg/?K
d. 16.1 kg/metre/kg/?K
e. 10.0 kg/metre/kg/?K
Q. In case of centrifugal compressors the phenomenon of fixed mass flow rate in compressor regardless of pressure ratio is known as
a. Choking
b. Stalling
c. Recirculation
d. Surging
e. Regeneration
Q. The statement that the entropy of a pure substance in complete theromodynamic equilibrium becomes zero at the absolute zero of temperature is known as
a. First law of thermodynamics
b. Third law of thermodynamics
c. Law of entropy
d. Zeroth law of thermodynamics
e. Second law of thermodynamics
Q. A Carnot refrigerator extracts 100 kcal of heat per minute from a cold room which is maintained at - 15?C and it is discharged to atmosphere at 30?C. The horse power required to run the unit would be
a. 1
b. 1.5 to 2
c. Mone than 6
d. 2 to 5
e. 5 to 6
Q. The function of a distributor is
a. To distribute fuel
b. To distribute spark
c. To time the spark
d. To distribute power
e. To generate the spark
Q. A petrol engine fuel that knocks at a low speed
a. Pulsejet
b. will have low fire point
c. has a high octane rating
d. will always knock at high speed
e. may not knock at high speed
Q. Which of the following does not use ambient air for propulsion?
a. Rocket
b. Turboprop
c. Turbojet
d. Pulsojet
e. Propellor
Q. During constant pressure heating of a gas the following does not increase?
a. Pressure
b. Pulsejet
c. Volume
d. Entropy
e. Temperature
Q. A safety valve is used on boilers to
a. Check the level of water
b. Check the level of steam
c. Check the temperature of steam
d. To release excess pressure
e. None of the above
Q. For an ideal gas the value of Joule Kelvin coefficient is
a. Negative
b. Unity
c. Infinite
d. Zero
e. 0.5