# Mechanical Engineering Thermodynamics – Set 04

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

## Q2. The gas turbine cycle with regenerator improves

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

## 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

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

(A) The end states only
(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

## 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

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

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

## Q12. Mixture of ice and water form a

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

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

## 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

(A) 237°C
(B) -273°C
(C) -237°C
(D) 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

## 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