In an isolated system, neither the heat and work nor the, mass of the working su

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Question
In an isolated system, neither the heat and work nor the, mass of the working substance crosses the boundary of the system.
Options
A. True
B. False

Correct Answer

True

Thermodynamics problems

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1. According to First law of thermodynamics,
Options
A. total internal energy of a system during a process remains constant
B. total energy of a system remains constant
C. workdone by a system is equal to the heat transferred by the system
D. internal energy, enthalpy and entropy during a process remains constant

2. Which of the following statement is wrong?
Options
A. The closed cycle gas turbine plants are external combustion plants.
B. In the closed cycle gas turbine, the pressure range depends upon the atmospheric pressure.
C. The advantage of efficient internal combustion is eliminated as the closed cycle has an external surface.
D. In open cycle gas turbine, atmosphere acts as a sink and no coolant is required.

4. A cycle consisting of __________ and two isothermal processes is known as Stirling cycle.
Options
A. two constant pressure
B. two constant volume
C. two isentropic
D. one constant pressure, one constant volume

7. The condition for the reversibility of a cycle is
Options
A. the pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process
B. all the processes, taking place in the cycle of operation, must be extremely slow
C. the working parts of the engine must be friction free
D. all of the above

9. The compression ratio is the ratio of
Options
A. swept volume to total volume
B. total volume to swept volume
C. swept volume to clearance volume
D. total volume to clearance volume

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