Thermodynamics assignment on basic concepts and processes.

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