1.0 A higher mean effective pressure means a larger piston displacement in an au
ID: 1867811 • Letter: 1
Question
1.0 A higher mean effective pressure means a larger piston displacement in an auto engine for a given power output (a) True) (b) False 1.1 For the same compression ratio, the efficiency of the air-standard Otto cycle is normally greater than the Diesel cycle (a) True (b) False 1.2 The compression ratio of an auto engine refers to the sum of the volumes at the TDC and BDC (a) True (b) False 1.3 The thermal efficiency of the ideal Otto cycle increases with the compression ratio and decreases with the specific heat ratio (a) True (b) false 1.4 The compression ratio of a spark ignition auto engine is normally lower than diesel engine (a) True (b) False 1.5 The thermal efficiency of the simple Brayton cycle decreases with the pressure ratio (a) True (b) False 1.6 The Camot cycle is a realistic and widely used cycle that eliminates the practical limitations of the ideal Rankine cycle (a) True (b) False 1.7 During the regeneration process in a Rankine cycle liquid water (feedwater) leaving the pump is cooled prior to entering the boiler by steam bled off the turbine at some intermediate pressure in devices called feedwater heaters (a) True (b) False 18 Turbojet and a turbofan engines used in aircrafts are actually based on the same thermodynamic design concepts (a) True (b) False 1.9 A device that allows the same system to be used in a cooling or heating mode is (a) compressor (b) expansion valve (c) Reversing valve To minimize compression work during two-stage compression, the pressure ratio across each stage of the compressor must be (a) same (b) different 1.11 Area under the process curve on a P.V diagram represents heat and T-S diagram represents work arue (b) False 1.12 A closed system undergoing an isentropic process (m-c) uses a gas with k-14 and C,-? 8 kJ/k K what is the value of C,? 1.13 The Coefficient of Performance (COP, of a refrigerator is always greater than one (a) True (b) False 1.14 Entropy generation and exergy destruction of real processes are synonymous (a) True (b) False 14 points)Explanation / Answer
1.0 false
1.1 true
1.2 false
1.3 False
1.4 TRUE
1.5 FALSE
1.6 FALSE
1.7 true
1.8 TRUE
1.9 Compressor
1.10 SAME
1.11 FALSE
1.12 (1.28)
1.13 FALSE
1.14 TRUE
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