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MCQ Problems / Explanations



A TER which transfers heat to system is called .......... and one which receives heat is called ...........

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Efficiency of a heat engine is defined as

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Entropy occurs due to .............

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The equation for the average kinetic energy is ..............

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During a fluid flow, the temperature is developed due to .............

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The Kelvin temperature is numerically equal to the .......... and may be measured by means of a ............

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The statement of third law is also called the Fowler-Guggenheim statement of the third law.

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Which law is stated here, It is impossible to reduce any system to the absolute zero of temperature in a finite num...

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A definite zero point .......... on the absolute temperature scale but this point ......... be reached ......... vi...

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If a system undergoes a reversible isothermal process without transfer of heat, the temperature at which this proce...

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When the heat transferred isothermally between the given .......... decreases, the temperature ............

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In defining the temperature scale, the standard reference point is taken as

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The absolute thermodynamic temperature scale is also known as

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It is necessary to have a temperature difference to obtain work of any cycle.

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The greater the temperature, the ......... is the vapour pressure.

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When two equilibrium states are infinitesimally near,

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Air can be cooled and dehumidified by

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The wet bulb temperature is the temperature recorded by moistened bulb.

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Which of the following statement is true?

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Humidity ratio is given by the ratio of

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If water is injected into a container with has unsaturated air

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For saturated air, relative humidity is 0%.

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Relative humidity is defined as

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When pw is very small,

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In a mixture of dry air and water vapour,

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Air with initial condition of p1, v1 expands to final condition of p1/2, 3v1.The process is

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Air expands from initial condition of p1, v1 to final condition of 1/2 p1, 2v1.Choose the correct statement

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A gas expands from initial condition of (p1, v1, T1) to final condition (p2, v1, T2), then according to Charle's la...

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The relationship between pressure & volume is expressed as pv?=const. Selectwrong statement

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Variations of pressure & volume atconstant temperature are correlated through

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Which one of the following pairs best expresses a relationship similar to that expressed in the pair 'pressure-volu...

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Increase in entropy of a systemrepresents

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Entropy in statistical thermodynamics isdefined as

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Adiabatic & isothermal processes areidentical at

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For any irreversible process the netentropy change is

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An ideal gas as compared to a real gas atvery high pressure occupies

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In the reversible polytropic process the value of exponent n varies between

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The index of compression n tends to reach ? (ratio of specific heats)

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The index of compression n tends to reach ? (ratio of specific heats)

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For ....... The internal energy & enthalpy are the functions of temperature only

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Which of the following processes arereversible processes?

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Which of the following processes isreversible process?

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Regarding enthalpy which of the following statements is incorrect?

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On which of the following factors does air standard efficiency of a diesel cycle depend?

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On which of the following factors does air standard efficiency of a diesel cycle depend?

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When two gases suddenly mix up with each other then resultant entropy of the system will

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Internal energy & enthalpy of an ideal gasare functions of

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........ Is the unit of entropy

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Under which of the following conditionsall gases behave ideally?

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During a throttling process

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The total entropy of a mixture of gases is the ........... of the partial entropies.

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Which of the following relation is correct?

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The expression which represents the pressure exerted by a gas is

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The slope of sublimation curve is ............ the slope of the vaporization curve at triple point.

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Water ......... on melting and has the fusion curve with a .......... slope.

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The Clausius-Clapeyron equation is given by

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A pure substance which exists in a single phase has .......... independent variables.

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A pure substance which exists in a single phase has .......... independent variables.

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If a relation exists among variables x,y,z then z may be expressed as a function of x and y as, dz=Mdx+Ndy .

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1 mole of cyclohexane (z = 1.2) is filled in a container at 27oC and 4 atm, what is the volume of container?

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Which of the following is true about compressibility of real gases?

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The following also gave two-constant equations of state.

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The temperature of feedwater leaving a heater is ............ the saturation temperature at steam extraction pressu...

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How many types of feedwater heaters are present?

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Which of the following contributes to the improvement of efficiency of Rankine cycle in a Thermal Power Plant?

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An 80 litre vessel contains 4 kg of R-134a at a pressure of 160 kPa. Determine the volume occupied by the vapour ph...

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Which of the following represents the specific volume during phase transition.

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What is the most preferable dryness fraction of the exhaust steam?

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Which of the following problems are posed by increasing the number of reheats?

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What is the effect of reheat pressure on mean temperature of heat addition Tml?

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The correct sequence of the processes taking place in a carnot cycle is

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Which if the following statements are true for a mechanical energy reservoir(MER)?

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Carnot cycle is a reversible cycle.

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Processes inside a thermal energy reservoir are quasi-static.

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A thermal energy reservoir is a large body of

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In a heat engine cycle, which of the following process occurs?

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Boiler, turbine, condenser and pump together constitute a heat engine.

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Which of the following is true?

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According to Joule’s experiments,

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The first law of thermodynamics doesn’t tell us whether a thermodynamic process is feasible or not.

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What reaction takes place during photosynthesis?

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Which among this is not an exothermic reaction?

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SI unit of enthalpy is

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What is the equation of entropy?

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Entropy occurs due to

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The equation for the average kinetic energy is

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During a fluid flow, the temperature is developed due to

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First law of thermodynamics deals with

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When the heat transferred isothermally

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At absolute zero, an isotherm and an adiabatic are identical.

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Which of the following statement is true?

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Phase change occurs at

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The greater the temperature, the is the vapour pressure.

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Which of the following statement is true?

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At a pressure below the triple point line,

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The area under the T-s (temperature - entropy) curve of any thermodynamicprocess represents

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Gases could have an infinite number ofspecific heats but only ................ Specific heats are defined

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The reversible engines are

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Which of the following is the correct statement?

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The efficiency of the Carnot cycle may beincreased by

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