This document contains an assignment with 6 questions for a 3rd semester mechanical engineering class. The questions cover topics related to thermodynamics, including thermodynamic equilibrium, the differences and similarities between heat and work transfer, limitations of the first law of thermodynamics, cyclic processes involving air in a cylinder, and using PV diagrams to analyze thermodynamic cycles. The students are asked to calculate changes in internal energy, enthalpy, heat transfer, and work transfer for specified thermodynamic processes and cycles.

1. MECHANICAL ENGINEERING DEPARTMENT
ASSIGNMENT NO. 1 CLASS: III SEM SUBMISSION DATE: 12.09.2016
Q1. WHAT IS THERMODYNAMIC EQUILIBRIUM?
Q2. GIVE THE DIFFERENCESANDSIMILARITIESBETWEEN HEAT ANDWORK TRANSFER.
Q3. WHAT ARE THE LIITATIONSOFFIRST LAW OF THERMODYNAMICS?
Q4. SHOW THAT PVˠ= C
Q5. AIR UNDERGOES A CYCLIC PROCESSIN A CYLINDER ANDPISTON ARRANGEMENT.ONE KG OF
ATMOSPHERICAIR AT 1 BARAND 300˚K ISFIRST COMPRESSED ADIABATICALLYTO12 BAR,
THEN EXPANDEDISOTHERMALLY UPTO THE INITIALPRESSURE AND LASTLY THE AIRIS
BROUGHT TO INITIALCONDITIONSUNDERCONSTANTPRESSURE.CALCULATE FOR EACH
PROCESSANDFOR THE CYCLE:
1. CHANGE IN INTERNALENERGY
2. CHANGE IN ENTHALPY
3. HEAT TRANSFER
4. WORK TRANSFER,IFCp= 1.005 kJ/kgK and ˠ - 1.4
Q6. A MASS OF AIRINITIALLYAT 500˚C IS AT A PRESSURE OF 10 BAR ANDHAS A VOLUME OF 0.03M3
.
THE AIRIS EXPANDEDISOBARICALLYTO0.09M3, A POLYTROPICPROCESSWITH N=1.5 IS THEN
CARRIEDOUT, FOLLOWED BY A CONSTANTTEMPERATURE PROCESS WHICH COMPLETES THE
CYCLE. ALL PROCESSESARE REVERSIBLE. SKETCH THE CYCLE ON PV DIAGRAMAND FINDTHE
HEAT RECEIVED ANDHEAT REJECTED IN THE CYCLE. R=287J/KG KAND Cv=0.718KJ/KG K