List of top Mechanical Engineering Questions on Thermodynamics asked in CUET (PG)

Match List-I with List-II

List-I (Dimensionless Numbers)	List-II (Relationship)
(A) Froude's Number	(II) \( \sqrt{\frac{\text{Inertia force}}{\text{Gravity force}}} \)
(B) Mach's Number	(IV) \( \sqrt{\frac{\text{Inertia force}}{\text{Elastic Force}}} \)
(C) Euler's Number	(I) \( \frac{\text{Pressure Force}}{\text{Inertia Force}} \)
(D) Weber's Number	(III) \( \frac{\text{Inertia Force}}{\text{Surface Tension Force}} \)

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An aeroplane is flying at a height of 15 km, where the temperature is -50°C. Assuming \( k = 1.4 \) and \( R = 287 \, \text{J/K . kg} \), the approximate speed of the plane corresponding to \( M = 2.0 \) will be?

The latent heat of vaporization at the critical point is

Match List-I with List-II

List-I	List-II
(A) Work done in a polytropic process	(IV) \( \frac{p_1 V_1 - p_2 V_2}{n - 1} \)
(B) Work done in a steady flow process	(I) \( - \int v \, dp \)
(C) Heat transfer in a reversible adiabatic process	(II) Zero
(D) Work done in an isentropic process	(III) \( \frac{p_1 V_1 - p_2 V_2}{\gamma - 1} \)

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Which thermodynamics law predicts correctly the degree of completion of a chemical reaction?

A refrigerating machine working on a reversed Carnot cycle takes out 2 kW of heat from the system while working between temperature limits of 300K and 200K. The coefficient of performance and power consumed by the cycle will be respectively:

Gas contained in a closed system consisting of a piston-cylinder arrangement is expanded. Work done by the gas during expansion is 50 kJ. The decrease in internal energy of the gas during expansion is 30 kJ. The heat transfer during the process is equal to:

In a psychrometric chart, what does a vertical downward line represent?

Match List-I with List-II

List-I (Details of the processes of the cycle)	List-II (Name of the cycle)
(A) Two adiabatic, one isobaric and two isochoric	(I) Diesel
(B) Two adiabatic and two isochoric	(II) Carnot
(C) Two adiabatic, one isobaric and one isochoric	(III) Dual
(D) Two adiabatics and two isothermals	(IV) Otto

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