Chemical Engineering Thermodynamics A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect? Air refrigeration cycle Vapor compression cycle using expansion engine Vapor compression cycle using expansion valve Carnot refrigeration cycle Air refrigeration cycle Vapor compression cycle using expansion engine Vapor compression cycle using expansion valve Carnot refrigeration cycle ANSWER DOWNLOAD EXAMIANS APP
Chemical Engineering Thermodynamics The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is R log10 4 Cv loge 4 Cv log10 4 R loge 4 R log10 4 Cv loge 4 Cv log10 4 R loge 4 ANSWER DOWNLOAD EXAMIANS APP
Chemical Engineering Thermodynamics Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in Decreased COP Increased COP Same COP Increased or decreased COP ; depending upon the type of refrigerant Decreased COP Increased COP Same COP Increased or decreased COP ; depending upon the type of refrigerant ANSWER DOWNLOAD EXAMIANS APP
Chemical Engineering Thermodynamics For spontaneous changes in an isolated system (S = entropy) Ds > 0 Ds = Constant Ds = 0 Ds <0 Ds > 0 Ds = Constant Ds = 0 Ds <0 ANSWER DOWNLOAD EXAMIANS APP
Chemical Engineering Thermodynamics It is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions. Work alone can not bring out such a change of state More information is needed to conclude anything about the path dependence or otherwise of the work needed The amount of work needed is independent of path The amount of work needed is path dependent Work alone can not bring out such a change of state More information is needed to conclude anything about the path dependence or otherwise of the work needed The amount of work needed is independent of path The amount of work needed is path dependent ANSWER DOWNLOAD EXAMIANS APP
Chemical Engineering Thermodynamics While dissolving a gas into a liquid at a constant temperature, the ratio of the concentration of the gas in the solution phase and in the gaseous phase is Unity Constant Infinity Negative Unity Constant Infinity Negative ANSWER DOWNLOAD EXAMIANS APP
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