Top 350+ Solved Thermodynamics MCQ Questions Answer
Q. Sadi Carnot was a
a. French engineer
b. Russian engineer
c. Pulsejet
d. British engineer
e. German engineer
Q. Cut of ratio in a steam engine is the ratio of
a. Work done by piston after cut off to total work done per cylinder
b. Fraction of piston stroke which the piston has travelled when cut off occurs
c. Pressure at cut off to supply pressure
d. Pressure at cut off to exhaust pressure
e. Pressure at cut off to mean effective pressure
Q. Which of the following statement about Vanc der Waal's equation is valid?
a. Pulsejet
b. It represents a straight line on pv versus v plot
c. The equation is valid for diatomic gases only
d. It is valid for all pressures and temperatures
e. It has three roots of identical value at the critical point
Q. The statement that the volume of a mixture of ideal gases is equal to the span of the partial volumes which the constituent gases would occupy if each existed alone at the pressure and temperature of the mixture, is known as
a. Clapeyrons law
b. Maxwell's law
c. Leduc's law
d. Daltons law
e. Clausius law
Q. The rate of radiant energy, which is emitted by a surface at any temperature and in small wavelengths is found from the known rate of energy, which under the same conditions would be emitted from a black surface, by multiplying with the absorptivity. Above enunciation is known as
a. Planck's law
b. Kirchhoff's law
c. Stefan Bolzmann's law
d. Lambart's rule
e. None of the above
Q. A gs which satisfies the Kinetic theory of gases is known as
a. Manoatomic gas
b. Diatomic gas
c. Real gas
d. Perfect gas
e. None of the above
Q. Which of the following gas will satisfy, Boyle's law over a wider range of temperatures and pressures?
a. Helium
b. Pulsejet
c. Oxygen
d. Hydrogen
e. Carbon monoxide
Q. The term "pre-whirl" is associated with
a. Gas turbines
b. Super-charged diesel engines
c. Sliding vane type air compressors
d. Reciprocating air compressors
e. Centrifugal air compressors
Q. If a heat engine gives an output of 3 kW and input is 10,000 J/s the thermal efficiency of the engine will be
a. 70%
b. 30%
c. 33.30%
d. 66.60%
e. 100%
Q. An amount of heat given to a gas under isothermal conditions will be
a. For a temperature rise
b. For doing external work
c. For doing external work and also for a temperature rise
d. For increasing the internal energy of the gas
e. None of the above
Q. By applying chike in an automobile we get
a. Stoichiometric mixture
b. Chemically correct mixture
c. Weak mixture
d. Lean mixture
e. Rich mixture
Q. The critical temperature of carbondioside is 31.1?C. If the room temperature is 34.7?C, then carbondioxide at room temperature is
a. vapour
b. wet vapour
c. Pulsejet
d. superheated vapour
e. gas
Q. In case of a four cylinder diesel engine, the heat carried away by exhaust gases will be
a. 10 to 20 percent
b. 50 to 70 percent
c. 25 to 35 percent
d. 5 to 7 percent
e. 7 to 10 percent