Diploma Thermal Engineering 1 important questions and answers – 3 marks

Diploma Thermal Engineering 1 important questions and answers

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Diploma Thermal Engineering 1 important questions and answers

Diploma Thermal Engineering 1 important questions and answers in PDF

Thermal Engineering – 1
Unit 1 Click here
Unit 2 Part 1 Click here
Unit 2 Part 2  Click here
Unit 3 Click here
Unit 4 Click here
Unit 5 Click here

 

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Thermal Engineering 1 Syllabus

Unit – 1, BASICS OF THERMODYNAMICS AND THERMODYNAMIC PROCESSES OF PERFECT GASES
Introduction – definitions and units of mass, weight, volume, density, work –power-energy – types- specific weight, specific gravity and specific volume – pressure – units of pressure –temperature – absolute temperature – S.T.P and N.T.P conditions – heat -specific heat capacity at constant volume and at constant pressure – law of conservation of energy – thermodynamic system– types –thermodynamic equilibrium – properties of systems – intensive and extensive properties –State of System- process – cycle – point and path functions – zeroth, first and second laws of thermodynamics. Description of basic concepts only.Perfect gases – laws of perfect gases – Boyle’s, Charles’, Joule’s, Regnault’s and Avogadro’s laws –General Gas Equationcharacteristic gas equation – relation between specific heats and gas constant – universal gas constant  Thermodynamic ProcessesChange in Internal Energy- enthalpy –change in enthalpy – entropy – change in entropy – general equations for change in entropy.
Description only. Constant volume, constant pressure, isothermal, isentropic (reversible
adiabatic) – Description and problems. Polytropic (derivation only), hyperbolic (derivation only) – P-V and T-S diagrams, work done, change in internal energy, heat transfer, change in enthalpy, change in entropy for various processes – Free expansion and throttling processes.

Unit-2, THERMODYNAMIC AIR CYCLES AND HEAT TRANSFER
Air cycles – air standard efficiency – reversible and irreversible processes –assumptions in deriving air standard efficiency – Carnot cycle – Otto cycle –Joule cycle – Diesel cycle – comparison of Otto cycle and Diesel cycle -Comparison of ideal and actual p-V diagrams
of Otto and Diesel cycles –problems . Modes of heat transfer – heat transfer by conduction – Fourier’s Law- – heat transfer by convection –heat exchanger – Parallel flow and Counter flow– heat transfer by radiation – Description only. Steady flow system – control volume – steady flow energy equation – assumptions –Engineering applications of steady flow energy equation – non flow energy equation. Description only.

UNIT-3, INTERNAL COMBUSTION ENGINES
Internal combustion engines. Classifications of I.C Engines – components of I.C Engines and functions material and method of manufacturing – four stroke cycle petrol and diesel engines – two stroke cycle petrol and diesel engines – comparison of four stroke and two stroke engines – Comparison of petrol and diesel engines – valve timing diagram for four stroke petrol and diesel engines – port timing diagram for two stroke petrol and diesel engines. Layout of fuel supply system in petrol engines – A.C. mechanical fuel pump – simple carburetor – layout of fuel supply system in diesel engine- single acting fuel feed pump – CAV fuel injection pump – fuel injectors – types of nozzles -fuel filters. Ignition systems – battery coil ignition systems – magneto ignition system – MPFI and CRDI System. Governing of I.C. engines – quantity and quality governing – cooling systems – air cooling – water cooling. Lubrication system – properties of lubricants –types of lubrication systems – high pressure Lubrication system – oil pump (Gear & Rotor Pumps) and oil filters.

Unit – 4,  FUELS &COMBUSTION OF FUELS AND PERFORMANCE OF I.C
ENGINES
Classifications of fuels – merits and demerits – requirements of a good fuel –combustion equations – stoichiometric air required for complete combustion of fuels – excess air products of combustion – analysis of exhaust gases – Exhaust gas analyser – calorific value of fuels – higher and lower calorific values – Dulong’s formula – determination
of calorific value – Bomb and Junker’s calorimeter. Description only. Testing – thermodynamic and commercial tests – indicated power – brake power – friction power – efficiencies of I.C. engines – indicated thermal ,brake thermal, mechanical and relative efficiencies – Specific fuel consumption – problems – Morse test – heat balance sheet –
procedure and problems.

Unit – 5, REFRIGERATION AND AIR CONDITIONING
Refrigeration – refrigerators and heat pumps – types and applications of refrigeration Systems – refrigerating effect – unit of Refrigeration – C.O.P. – actual C.O.P. Air Refrigeration System – reversed Carnot cycle – C.O.P of refrigerator, heat pump & Heat Engines. Bellcoleman cycle – Vapour compression refrigeration system – vapour
absorption system – Comparision – refrigerants – properties. Description only. Psychrometry – psychometric properties – dry air – moist air – water vapour – saturated air – dry bulb temperature – wet bulb temperature – wet bulbdepression – dew point temperature – dew point depression – humidity – specific and relative humidity – psychrometric chart – psychrometric processes – sensible heating and cooling – Bypass Factor – humidification – dehumidification –Mixing of Air Stream. Air conditioning – classification and applications of air conditioning system – room air conditioning – central air conditioning – comparison – comfort and industrial air conditioning – factors to be considered in air conditioning – loads encountered in air conditioning systems. Description only.

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