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civil engineering interview questions, mechanical engineering interview questions, electrical engineering interview questions, eee, it, cse, lab viva questions, seminar topics, mcqs, clas* notes, gate syllabus and objective type questions, online preparation tests for. mechanical engineering interview questions and answers with explanation for job interview, competitive examinations and entrance. tests. fully solved examples with detailed information about mechanical engineering questions and answers pdf. mechanical engineering is the branch of engineering which deals with the designing, constructing , maintaining and manufacturing various 2. what is the difference between machine and engine? engine converts heat energy to mechanical energy but machine converts all forms of energy to mechanical energy except heat energy.. 3. what are the names given to constant temperature, constant pressure, constant volume, constant internal energy, constant. enthalpy, and constant entropy processes. isothermal, isochroic, isobaric, free expression, throttling and 4. why entropy change for a reversible adiabatic process is zero ? because there is no heat transfer in this process. 5. what are two essential conditions of perfect gas ? it satisfies equation of state and its specific heats are constant. 6. what are turbo machines? turbo machines are devices which transfer energy to or from the fluid. 7. why rate of condensation is higher on a polished surface compared to rusty surface ? polished surface promotes drop wise condensation and does not wet the surface. 8. what is the difference between heat engine & heat pump? heat engine produces work and transfers energy from high temp. to low temp source medium. in heat pump external work is needed to transfer energy from low to high temp. medium. 9. what is the relationship between cop of heating and cooling ? cop of heating is one(unity) more than cop of cooling. 11. when maximum discharge is obtained in nozzle ? at the critical pressure ratio.