Question

1. The exergy change of a system can be a) Only positive during a process b) Only negative during a process c) Positive or negative during a process d) None of the above 2. Which of the following air standard heat engine cycles can have a 100% second law efficiency a) Otto cycle b) Ericsson cycle c) Diesel cycle d) Brayton cycle 3. Both energy and exergy can be transferred by a) Heat and work b) Mass and heat c) Work and mass d) Work, heat, and mass 4. Carnot and Stirling heat engines are a) Internally reversible b) Externally reversible c) Totally reversible d) None of the above 5. If the system boundary contracts during the process then a) Exergy accompanied by the work transfer will be more than the work itself b) Exergy accompanied by work transfer will be zero c) Exergy accompanied by the work transfer will be less than the work itself d) Exergy accompanied by the work transfer will be work itself 6. The thermal efficiency of ideal or air standard Diesel cycle approaches to Otto cycle efficiency if the cut-off ratio becomes a) Zero b) Unity c) Negative d) None of the above 7. The work done during the process of heat addition in the Otto cycle is...

Answer 1

Din 2.8 Q3 Q.4 2.5 .6 - Q.7 (B) (B) (A) (A) (c) (6) zero cs Scanned with CamScanner