17 In an irreversible process there is a loss of heat. no loss of work MED a b gain of heat No gain of heat e Mechanical and fluid friction f Unrestricted expansion g Heat transfer with a finite temperature difference Which or the following is the correct statement? C d a b C d All engines are designed as reversible in order to obtain maximum efficiency The increase in entropy is obtained from a given quantity of heat at a low temperature The entropy represents a maximum amount of work obtainable per degree drop in temperature The change in entropy may be regarded as a measure of the rate of the availability of heat for transformation into work e f g For the same compression ratio a b C d e f a b All the statements g Thermal efficiency of Otto cycle may be greater or lesser than that of Diesel cycle The thermal efficiency of theoretical Otto cycle C d e f a b All the reversible engines have the same efficiency All the reversible and irreversible engines have the same efficiency Irreversible engines have maximum efficiency C d g None of the statements Which of the following are true for the limitations and impracticalities of the evaporator and condenser of t Carnot vapour cycle? Difficulty in controlling the condensation process to desired quality at pump inlet. Difficulty in designing a compressor that handles two phases. a b Thermal efficiency of Otto cycle is greater than that of Diesel cycle Thermal efficiency of Otto cycle is less than that of Diesel cycle Thermal efficiency of Otto cycle is same as that of Diesel cycle Thermal efficiency of Otto cycle cannot be predicted. None of the statements C d e f g Increases with increase in compression ratio Increases with increase in pressure ratio Increases with increase in adiabatic index decreases with increase in compression ratio decreases with increase in pressure ratio decreases with increase in adiabatic index e Limitation in reaching a suitable maximum temperature. f Limitation of the thermal efficiencies due to operation temperature. g Difficulty in accomplishing a working fluid in a single phase at a high temperature. Which of the following are true for the limitations and impracticalities of the compressor of the Carnot vapour cycle? The challenge of device that can handle steam with high moisture content. Incident of wear and corrosion on device blades. Difficulty in controlling the condensation process to desired quality at pump inlet. Difficulty in designing a compressor that handles two phases. The challenge of device that can handle steam with high moisture content. Incident of wear and corrosion on device blades. Limitation in reaching a suitable maximum temperature. Limitation of the thermal efficiencies due to operation temperature. Difficulty in accomplishing a working fluid in a single phase at a high temperature.