Top 350+ Solved Thermodynamics MCQ Questions Answer
Q. Which of the following is not a positive displacement compressor?
a. Centrifugal compressor?
b. Vane type compressor
c. Roots blower
d. Double acting reciprocating compressor
e. Single stage reciprocating compressor
Q. The internal energy of a substance depdnds on
a. Velocity
b. Pressure
c. Entropy
d. Temperature
e. Volume
Q. According to Kinetic theory of gases, at absolute zero
a. Pressure of gas will reduce to zero
b. Mass of gas will reduce to zero
c. Volume of gas will reduce to zero
d. Kinetic energy of gas molecules will reduce to zero
e. Specific heat of molecules will reduce to zero
Q. 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
e. Pulsejet
Q. Which of the following is conserved across a shock wave?
a. Temperature
b. Pressure
c. Momentum
d. All of the above
e. Temperature remains constant
Q. A cycle which consists of two adiabatic and two constant volume processes is known as
a. Pulsejet
b. Diesel cycle
c. Carnot cycle
d. Stirling cycle
e. Otto cycle
Q. If the roof of a house is replaced by a shiny metallic surface the temperature inside will
a. microns
b. Decrease
c. Increase
d. Remain unaltered
Q. In an isothermal process
a. Pressure remains constant
b. Change in internal energy is zero
c. Enthalpy change is maximum
d. Volume remains constant
e. Temperature increases gradually
Q. A 500 litre tank contains a saturated mixture of steam and water at 300?C. If the mass of steam and water within the tank is equal, it can be concluded that
a. Steam will be nearly dry and saturated
b. volume of steam will be less than the volume of water
c. Pulsejet
d. Dryness fraction of steam will be closer to 0.5
e. Volume of steam will be less than the volume of water
Q. When a fluid is passed in steady, flow through a porous plug in a duct under such conditions that heat transfer, kinetic energy change and potential change is negligible, the process is called
a. Throttling
b. Separation
c. Constant pressure compression
d. Isothermal compression
e. Frictionless compression
Q. In adiabatic compression the decrease in volume is associated with
a. Pulsejet
b. decrease in temperature and increase in pressure
c. increase in temperature and increase in pressure
d. increase in temperature and decrease in pressure
e. decrease in temperature and decrease in pressure
Q. A Brayton cycle is also a reversed
a. Carnot cycle
b. Dual cycle
c. Joule cycle
d. Otto cycle
e. Rankine cycle
Q. For diatomic gas flowing through a nozzle the critical pressure ratio is given by
a. 0.577
b. 0.546
c. 0.75
d. 1
e. 0.528
Q. The molecular volume of any perfect gas at 600 x 103 N/m3 and 27?C will be
a. 41.7 m3/kg mol
b. 4.17 m3/kg mol
c. 47.7 m3/kg mol
d. 2.085 m3/kg mol
e. 85.3 m3/kg mol
Q. In a 2 stroke engine we get one power stroke in
a. 180? of crank rotation
b. 540? of crank rotation
c. 360? of crank rotation
d. 270? of crank rotation
e. 720? of crank rotation