A. a thermodynamic machine
B. a non-thermodynamic machine
C. a hypothetical machine
D. a hypothetical machine whose opera-tion would violate the laws of thermodynamics
E. an inefficient machine
Related Mcqs:
- The energy of molecular motion appears as________________?
A. heat
B. potential energy
C. surface tension
D. friction
E. increase in pressure - Work done in a free expansion process is___________________?
A. + ve
B. -ve
C. zero
D. maximum
E. minimum - An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is___________________?
A. feasible
B. impossible
C. possible
D. possible, but with lot of sophistications
E. desirable - The unit’of universal gas constant is___________________?
A. watts/°K
B. dynes/°C
C. ergscm/°K
D. erg/°K
E. none of the above - The behaviour of gases can be fully determined by___________________?
A. 1 law
B. 2 laws
C. 3 laws
D. 4 laws - If value of n is infinitely large in a polytropic process pV” = C, then the process is known as constant_____________________?
A. volume
B. pressure
C. temperature
D. enthalpy
E. entropy - Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant________________?
A. pressure
B. temperature
C. volume
D. internal energy
E. entropy - Which of the following cycles is not a reversible cycle_____________________?
A. Carnot
B. Ericsson
C. Stirling
D. Joule
E. none of the above - For which of the following substances, the internal energy and enthalpy are the functions of temperature only____________________?
A. any gas
B. saturated steam
C. water
D. perfect gas
E. superheated steam - A closed system is one in which_________________________?
A. mass does not cross boundaries of the system, though energy may do so
B. mass crosses the boundary but not the energy
C. neither mass nor energy crosses the boundaries of the system
D. both energy and mass cross the boundaries of the system
E. thermodynamic reactions take place
