(a) True) ( a 1.0 A low mean effective pressure means a large piston displacemen
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(a) True) ( a 1.0 A low mean effective pressure means a large piston displacement for a given power output 1.1 Two major differences between the air-standard Otto and Diesel cycle are (very brietly) 1.2 What does the compression ratio in an Otto or Diesel cycle signify? iency of the ideal Otto cycle increases with the compression ratio but decreases with the specific heat ratio (a) True (b) false of a k ignition auto engine is normally higher than diesel engine (a) True (b) False 1.4 The compression ratio 1.5 The thermal efficiency of the simple Brayton cycle decreases with the pressure ratio (a) True (b) False 1.6 Three main reasons the Camot cycle is not a realistic model for steam power plants .7 During the regeneration process in a Rankine cycle liquid water (feedwater) leaving the pump is cooled by steam bled off the turbine at some intermediate pressure in devices called feedwater heaters (a) True (b) False What is the main difference between a turbojet and a turbofan engine in one short sentence? coefficient of performance (COP) (a) COP Desired output/Required input-?/Work input (b) COP Desired output/Required input- ?/Work input 1.8 1.9, Fillin the mising information (marked by the ? Symbol) in the expressions for the performance of refrigerators 1.10 To minimize compression work during two-stage compression, the pressure natio across each stage of th (a) same (b) different 1.11 What does the area under the process curve on a T-S diagram represent? 12 Students who demonstrate a commendable sense of responsibilities in terms of class attendance, timely submittal of home work respectful conduct in the class and are more committed to the pursuit of knowledge are expected to generate very little entropy in all their assignments during their professional career (a) True (b) False 1.13 If the volume flow rates at the inlet and at the outlet are the same for a device with one outlet and one inlet, is the flow through this 1.14 Write down the general forms of mass and energy equations for steady flow processes device necessarily steady?Explanation / Answer
1.0) a) True
1.1) Major difference between Otto cycle and Diesel cycle.
1.2) Compression ratio, in an internal-combustion engine, is the degree to which the fuel mixture is compressed before ignition. It is defined as the maximum volume of the combustion chamber (with the piston farthest out, or bottom dead centre) divided by the volume with the piston in the full-compression position (with the piston nearest the head of the cylinder, or top dead centre). A compression ratio of 10 means that the mixture is compressed to one-tenth its original volume by the action of the piston in the cylinder.
1.3) b) False
1.4) b) False
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