## Articles Posted in the " Basics of Thermodynamics " Category

• ### mcq-Thermodynamics Introduction

mcq-Thermodynamics Introduction Temperature is a (a) Derived quantity (b) Supplementary quantity © Fundamental quantity None ANS: © A closed thermodynamic system involves the use of (a) Only mass (b) Only Energy (c) Mass and energy (d) None ANS: (d) A thermodynamic system is a (a) 3 dimensional space (b) 2- dimensional area (c) 1-D line […]

• ### Van der Waals Equation

Van der Waals Equation of State It is a real gas equation. It is not perfect gas equation. In includes two corrections. First correction for the inter-molecular attractions which are weak forces of attractions and repulsion between two molecules of the same substance. we use p =Kinetic pressure –internal pressure =p’-a/v2 p = p’ […]

• ### Different Temperature Scales

Different Temperature Scales COMPARISON OF DIFFERENT TEMPERATURE SCALES Sr. No. Fixed point Celcius (0C) Farhrenheit 0F Kelvin K Rankine R 1. Absolute zero 273.15 -459.67 0.00 0.00 2. Ice point 0.00 32 273.15 459.67 3. Triple point of water 0.00 32 273.15 459.67 4. Steam point 100 212 373.15 671.67   WHAT IS MEANT BY […]

• ### Thermodynamic working fluids and Devices

Thermodynamic working fluids and  Devices  Working fluids Water It is used in boilers, pumps and water turbines. Vapor Vapor is used in nozzles, steam engines, steam turbines, refrigeration and air conditioners. Air Air is used in compressors and air conditioning. Refrigerants Refrigerants like R-22, R-134 a and R-717 are used in refrigeration and air conditioning […]

• ### THERMODYNAMIC EQUILIBRIUM

THERMODYNAMIC EQUILIBRIUM It is defined for a system. Thermodynamic equilibrium means that the value of a certain property is same at various points. There is no variation with respect to time, space and state etc. For this to achieve, thermodynamic equilibrium require the following types of equilibrium. Mechanical equilibrium Chemical equilibrium Thermal equilibrium Electrical equilibrium […]

• ### THERMODYNAMIC FUNDAMENTALS-1

THERMODYNAMIC FUNDAMENTALS-1 What is the Difference between a control volume and control surface? ANS: Control volume is a 3 dimensional space in a thermodynamic system (say in a compressor or pump) across which there will be mass transfer, energy transfer and momentum transfer. This control volume is arbitrarily selected as per convenience. At a time, […]

• ### Energy

ENERGY Energy is the capacity to do work. It units are kJ. It is of two types. 1. Stored Energy—It is the energy possessed by a system within its boundaries. Examples of stored energy a. Potential energy b. Kinetic energy c. Internal energy d. Chemical energy e. Nuclear energy     2. Transit Energy—It is […]

• ### * Thermodynamic System

THERMODYNAMIC SYSTEM  A thermodynamic system is a 3- dimensional visible space in the universe in which one or more thermodynamic process (or processes) of energy conversion (from one form to another form) is taking place. SURROUNDINGS 3- dimensional visible space outside (external ) to the thermodynamic system is surroundings. BOUNDARY The separating border between the […]

• ### Types of engines

Types of engines Definition of an engine An engine is a device which does two functions. (i)Produces motion (produces power) as in a scooter/bike, car, bus, train and aircraft (ii) Generate electricity as in generators and vehicles TYPES OF ENGINES There are many considerations for the various types of engines (I) Power generation Intermittent power […]

• ### States of matter & phase change process

States of matter & phase change process  Differentiate between the three states of matter Solids  Liquids Gases Have fixed volume and fixed shape Have fixed volume But have variable shape Variable volume And variable shape What are the various types of phase changes? Five types of phase changes Phase change    Name of Process Practical Application […]