Top 350+ Solved Thermodynamics MCQ Questions Answer
Q. The perfect heat engine works on the Carnot cycle between 1000?C and 200?C. The efficiency of the engine will be
a. 60%
b. 68.20%
c. 37.20%
d. 80%
e. 62.80%
Q. Joule Thomson coefficient for an ideal gas having equation pv = RT is
a. Zero
b. 0.5
c. ?100?C
d. Unity
Q. The efficiency of a dicsel cycle will be maximum when
a. Engine is super-charged
b. Cylinder is water cooled
c. Injection pressure is high
d. Cut off is zero
e. Speed is high
Q. Thermodynamic equilibrium is completely defined by the specifications of
a. Internal energy
b. Generalized displacement
c. All the above together
d. None of the above
e. It is dimensionless
Q. In the polytropic process equation pvn Constant, if n = 0 the process is termed as
a. Constant volume
b. Constant pressure
c. Isothermal
d. Constant temperature
e. Adiabatic
Q. Out of the following materials which may be expected to have higher value of thermal conductivity?
a. Asbestos
b. Refractory brick
c. Wood
d. Clay
e. Nichrome
Q. In a Carnot engine, when the working substance gives heat to the sink
a. Changes depend on the operating conditions
b. The temperature of the sink increases
c. The temperature of both the sink and the source decreases
d. The temperature of the sink remains the same
e. The temperature of the source decreases
Q. Which of the following is not a property of the system?
a. Temperature
b. Pressure
c. Specific volume
d. Work
e. None of the above
Q. Which of the engine is used for fighter bombers?
a. Pulsejet
b. Ramjet
c. Turbo prop
d. Rockets
e. Turbojet
Q. A gas can never be liquid
a. Above critical temperature
b. When it is diatomic
c. When it is impure
d. When it is reactive with any other gas
e. Above room temperature
Q. A mixture of liquid and vapour Freon in a vessel is an example of
a. Isolated system
b. Heterogeneous system
c. Open system
d. Closed system
e. Transient system
Q. Heat exchanger used in a steam condenser of a thermal power plant is
a. Direct contact type
b. Recuperator type
c. Regenerator type
d. Any one of the above
e. None of the above
Q. A piece of paper wrapped tightly on a copper rod will get charred relatively slowly when held over a flame as compared to a piece of paper wrapped tightly on any of the following rod except
a. silver rod
b. iron rod
c. Pulsejet
d. brass rod
e. wooden rod
Q. Three engines A, B and C operating on Carnot cycle use working substances as oxygen, hydrogen and air. Which engine will have higher efficiency?
a. Engine C
b. All will have the same efficiency
c. Pulsejet
d. Engine B
e. Angine A
Q. In a diesel engine fuel is injected
a. after the end of compression stroke
b. at the beginning of compression stroke
c. at the end of compression stroke
d. before the end of compression stroke
e. Pulsejet