Mechanical Engineering Thermodynamics

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Q1. Work done in a free expansion process is

(A) Zero
(B) Maximum
(C) Minimum
(D) Positive

Answer: (A) Zero

Q2. The gas turbine cycle with regenerator improves

(A) Work ratio
(B) Thermal efficiency
(C) Avoid pollution
(D) None of these

Answer: (B) Thermal efficiency

Q3. The condition of perfect vacuum, i.e., absolute zero pressure can be attained at

(A) A temperature of 273.16°C
(B) A temperature of 0°C
(C) A temperature of 273 °K
(D) A negative pressure and 0°C temperature

Answer: (A) A temperature of 273.16°C

Q4. Stirling and Ericsson cycles are

(A) Quasi-static cycles
(B) Reversible cycles
(C) Semi-reversible cycles
(D) Irreversible cycles

Answer: (B) Reversible cycles

Q5. Work done in an adiabatic process between a given pair of end states depends on

(A) The end states only
(B) Particular adiabatic process
(C) The value of index ‘n’
(D) The value of heat transferred

Answer: (A) The end states only

Q6. The basis for measuring thermodynamic property of temperature is given by

(A) Zeroth law of thermodynamics
(B) First law of thermodynamics
(C) Second law of thermodynamics
(D) Third law of thermodynamics

Answer: (A) Zeroth law of thermodynamics

Q7. A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as

(A) Irreversible cycle
(B) Thermodynamic cycle
(C) Reversible cycle
(D) None of these

Answer: (B) Thermodynamic cycle

Q8. Energy can neither be created nor destroyed but can be converted from one form to other is inferred from

(A) Zeroth low of thermodynamic
(B) First law of thermodynamics
(C) Second law to thermodynamics
(D) Basic law of thermodynamics

Answer: (B) First law of thermodynamics

Q9. If a system after undergoing a series of processes, returns to the initial state then

(A) Process is thermodynamically in equilibrium
(B) Process is executed in closed system cycle
(C) Its entropy will change due to irreversibility
(D) Sum of heat and work transfer will be zero

Answer: (D) Sum of heat and work transfer will be zero

Q10. 1 kgf/cm² is equal to

(A) 760 mm Hg
(B) Zero mm Hg
(C) 735.6 mm Hg
(D) 1 mm Hg

Answer: (C) 735.6 mm Hg

Q11. General gas equation is

(A) PV=nRT
(B) PV=mRT
(C) PV = C
(D) PV=KiRT

Answer: (B) PV=mRT

Q12. Mixture of ice and water form a

(A) Closed system
(B) Open system
(C) Isolated system
(D) Heterogeneous system

Answer: (D) Heterogeneous system

Q13. For reversible adiabatic process, change in entropy is

(A) Maximum
(B) Minimum
(C) Zero
(D) Negative

Answer: (C) Zero

Q14. An adiabatic process is one in which

(A) The temperature of the gas changes
(B) No heat enters or leaves the gas
(C) The change in internal energy is equal to the mechanical work done
(D) All of the above

Answer:(D) All of the above

Q15. The absolute zero temperature is taken as

(A) 237°C
(B) -273°C
(C) -237°C
(D) 273°C

Answer: (B) -273°C

Q16. Which of the following laws is applicable for the behaviour of a perfect gas?

(A) Boyle’s law
(B) Charles ‘law
(C) Gay Lussac’s law
(D) All of the above

Answer: (D) All of the above

Q17. The compression ratio is the ratio of

(A) Total volume to swept volume
(B) Swept volume to clearance volume
(C) Swept volume to total volume
(D) Total volume to clearance volume

Answer: (D) Total volume to clearance volume

Q18. The efficiency of Carnot cycle depends upon

(A) Temperature limits
(B) Volume compression ratio
(C) Cut-off ratio and compression ratio
(D) Pressure ratio

Answer: (A) Temperature limits

Q19. Reheating in a gas turbine

(A) Increases the compressor work
(B) Increases the turbine work
(C) Increases the thermal efficiency
(D) Decreases the thermal efficiency

Answer: (C) Increases the thermal efficiency

Q20. Heat and work are

(A) Point functions
(B) System properties
(C) Path functions
(D) Intensive properties

Answer: (C) Path functions

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