A. Zero
B. +ve
C. -ve
D. Dependent on the path
Related Mcqs:
- Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is_____________________?
A. Positive
B. Negative
C. Zero
D. Infinity - In an ideal refrigeration cycle, the change in internal energy of the fluid is_____________?
A. +ve
B. -ve
C. 0
D. Either of the above three; depends on the nature of refrigerant - A car tyre of volume 0.057 m3 is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is__________________?
A. 380
B. 630
C. 760
D. 880 - The internal energy of an ideal gas does not change in a reversible _____________ process?
A. Isothermal
B. Adiabatic
C. Isobaric
D. Isometric - For a cyclic process, a fixed ratio between heat and work___________________?
A. Always exists
B. May exist
C. Never exists
D. Is difficult to predict - For an isothermal process, the internal energy of a gas____________________?
A. Increases
B. Decreases
C. Remains unchanged
D. Data insufficient, can’t be predicted - Internal energy is equal to the heat absorbed in case of a/an ______________ process?
A. Constant volume
B. Polytropic
C. Adiabatic
D. Constant pressure - For a constant volume process _____________ by the system is used only to increase the internal energy?
A. Heat absorbed
B. Work done
C. Both A. & B
D. Neither A. nor B - When a gas in a vessel expands, its internal energy decreases. The process involved is________________?
A. Reversible
B. Irreversible
C. Isothermal
D. Adiabatic - A cyclic engine exchanges heat with two reservoirs maintained at 100 and 300°C respectively. The maximum work (in J) that can be obtained from 1000 J of heat extracted from the hot reservoir is_________________?
A. 349
B. 651
C. 667
D. 1000
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