The processes occuring in open system which permit the transfer of mass to and from the system, are known as
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| A. | flow processes |
| B. | non-flow processes |
| C. | adiabatic processes |
| D. | none of these |
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An open system is one in which
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| A. | heat and work crosses the boundary of the system, but the mass of the working substance does not crosses the boundary of the system |
| B. | mass of the working substance crosses the boundary of the system but the heat and work does not crosses the boundary of the system |
| C. | both the heat and work as well as mass of the working substance crosses the boundary of the system |
| D. | neither the heat and work nor the mass of the working substance crosses the boundary of the system |
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An isothermal process is governed by
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| A. | Boyle's law |
| B. | Charles' law |
| C. | Gay-Lussac law |
| D. | Avogadro's law |
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Workdone in a free expansion process is
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An adiabatic process is one in which
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| A. | no heat enters or leaves the gas |
| B. | the temperature of the gas changes |
| C. | the change in internal energy is equal to the mechanical workdone |
| D. | all of the above |
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The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called
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| A. | specific heat at constant volume |
| B. | specific heat at constant pressure |
| C. | kilo Joule |
| D. | none of these |
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The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is
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| A. | equal to one |
| B. | less than one |
| C. | greater than one |
| D. | none of these |
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If the value of n = 0 in the equation pvn = C, then the process is called
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| A. | constant volume process |
| B. | adiabatic process |
| C. | constant pressure process |
| D. | isothermal process |
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A process, in which the temperature of the working substance remains constant during its expansion or compression, is called
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| A. | isothermal process |
| B. | hyperbolic process |
| C. | adiabatic process |
| D. | polytropic process |
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When the gas is cooled at constant pressure,
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| A. | its temperature increases but volume decreases |
| B. | its volume increases but temperature decreases |
| C. | both temperature and volume increases |
| D. | both temperature and volume decreases |
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Workdone during adiabatic expansion is given by (where p1 v1, T1 = Pressure, volume and temperature for the initial condition of gas, p2, v2, T2 = Corresponding values for the final condition of gas, R = Gas constant, and γ = Ratio of specific heats)
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In a free expansion process,
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| A. | W1 - 2 = 0 |
| B. | Q1 - 2 = 0 |
| C. | dU = 0 |
| D. | all of these |
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The increase in entropy of a system represents
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| A. | increase in availability of energy |
| B. | increase in temperature |
| C. | decrease in pressure |
| D. | degradation of energy |
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The heat absorbed during a polytropic process is
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The sum of internal energy (U) and the product of pressure and volume (p.v) is known as
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| A. | workdone |
| B. | entropy |
| C. | enthalpy |
| D. | none of these |
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The value of gas constant (R) in S. I. units is
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| A. | 0.287 J/kgK |
| B. | 2.87 J/kgK |
| C. | 28.7 J/kgK |
| D. | 287 J/kgK |
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When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called
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| A. | Zeroth law of thermodynamics |
| B. | First law of thermodynamics |
| C. | Second law of thermodynamics |
| D. | Kelvin Planck's law |
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The measurement of a thermodynamic property known as temperature is based on
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| A. | Zeroth law of thermodynamics |
| B. | First law of thermodynamics |
| C. | Second law of thermodynamics |
| D. | none of these |
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The general gas energy equation is (where Q1 - 2 = Heat supplied, dU = Change in internal energy, and W1 - 2 = Work done in heat units)
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| A. | Q1 - 2 = dU + W1 - 2 |
| B. | Q1 - 2 = dU - W1 - 2 |
| C. | Q1 - 2 = dU/W1 - 2 |
| D. | Q1 - 2 = dU x W1 - 2 |
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Which of the following is the correct statement of the second law of thermodynamics?
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| A. | It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work. |
| B. | It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source. |
| C. | There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy. |
| D. | all of the above |
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According to Kelvin-Planck's statement of second law of thermodynamics,
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| A. | it is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work |
| B. | it is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work |
| C. | it is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body |
| D. | none of the above |
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Kelvin-Planck's law deals with
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| A. | conservation of work |
| B. | conservation of heat |
| C. | conversion of heat into work |
| D. | conversion of work into heat |
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During which of the following process does heat rejection takes place in Carnot cycle?
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| A. | Isothermal expansion |
| B. | Isentropic expansion |
| C. | Isothermal compression |
| D. | Isentropic compression |
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A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as
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x Workdone
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