Mechanical Guru's

PAPER – 1 LAST YEAR QUESTION PAPER THERMODYNAMICS   Que – 1(a): DEFINE THE FOLLOWING                QUASI STATIC PROCESS, THERMODYNAMIC EQUILIBRIUM, HEAT & WORK, INTENSIVE AND EXTENSIVE PROPERTY Que – 1(b): IN A PISTON CYLINDER ARRANGEMENT, THE NON FLOW REVERSIBLE PROCESS IS GIVEN BY V = 200/PM 3 , WHERE P IS IN BAR, FIND THE WORK DONE WHEN THE PRESSURE INCREASES FROM 1 BAR TO 10 BAR. INDICATE THAT THE PROCESS IF COMPRESSION OR EXPANSION. QUE – 2(a): PROVE THAT THE MOLE FRACTION OF EACH CONSTITUENTS IN A MIXTURE OF PERFECT GASES IS THE SAME AS ITS VOLUME FRACTION AND ALSO, THE RATIO OF ITS PARTIAL PRESSURE TO THE TOTAL PRESSURE.   QUE – 2(b): A MIXTURE OF GASES HAVING 2 KG HE AND 5 KG N 2 AT 30 0 C AND 1 BAR IS COMPRESSED IN A REVERSIBLE ADIABATIC PROCESS TO 6 BAR. FIND:                                     i.             FINAL PRESSURE OF THE CONSTITUENTS                                   ii.             THE FINAL TEMPERATURE                         

MECHANICAL PROPERTIES MECHANICAL PROPERTIES: IN THE COURSE OF OPERATION OR USE, ALL THE ARTICLES AND STRUCTURES ARE SUBJECTED TO THE ACTION OF EXTERNAL FORCES, WHICH CREATE STRESSES THAT INEVITABLY CAUSE DEFORMATION. TO KEEP THESE STRESSES, AND, CONSEQUENTLY DEFORMATION WITHIN PERMISSIBLE LIMITS IT IS NECESSARY TO SELECT SUITABLE MATERIALS FOR THE COMPONENTS OF VARIOUS DESIGNS AND TO APPLY THE MOST EFFECTIVE HEAT TREATMENT. I.E. A COMPREHENSIVE KNOWLEDGE OF THE CHIEF CHARACTER TICS OF THE SEMI-FINISHED METAL PRODUCTS & FINISHED METAL ARTICLES (SUCH AS STRENGTH, DUCTILITY, TOUGHNESS ETC) ARE ESSENTIAL FOR THE PURPOSE. FOR THIS REASON THE SPECIFICATION OF METALS, USED IN THE MANUFACTURE OF VARIOUS PRODUCTS AND STRUCTURE, ARE BASED ON THE RESULTS OF MECHANICAL TESTS OR WE SAY THAT THE MECHANICAL TESTS CONDUCTED ON THE SPECIALLY PREPARED SPECIMENS (TEST PIECES) OF STANDARD FORM AND SIZE ON SPECIAL MACHINES TO OBTAINED THE STRENGTH, DUCTILITY AND TOUGHNESS CHARACTERISTICS