logo

MCQ Problems / Explanations



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

Last updated: 18 hour ago

Efficiency of a heat engine is defined as

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

The absolute thermodynamic temperature scale is also known as

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

When two equilibrium states are infinitesimally near,

Last updated: 18 hour ago

Air can be cooled and dehumidified by

Last updated: 18 hour ago

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

Last updated: 18 hour ago

Which of the following statement is true?

Last updated: 18 hour ago

Humidity ratio is given by the ratio of

Last updated: 18 hour ago

If water is injected into a container with has unsaturated air

Last updated: 18 hour ago

For saturated air, relative humidity is 0%.

Last updated: 18 hour ago

Relative humidity is defined as

Last updated: 18 hour ago

When pw is very small,

Last updated: 18 hour ago

In a mixture of dry air and water vapour,

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

Variations of pressure & volume atconstant temperature are correlated through

Last updated: 18 hour ago

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

Last updated: 18 hour ago

Increase in entropy of a systemrepresents

Last updated: 18 hour ago

Entropy in statistical thermodynamics isdefined as

Last updated: 18 hour ago

Adiabatic & isothermal processes areidentical at

Last updated: 18 hour ago

For any irreversible process the netentropy change is

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

Which of the following processes arereversible processes?

Last updated: 18 hour ago

Which of the following processes isreversible process?

Last updated: 18 hour ago

Regarding enthalpy which of the following statements is incorrect?

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

Internal energy & enthalpy of an ideal gasare functions of

Last updated: 18 hour ago

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

Last updated: 18 hour ago

Under which of the following conditionsall gases behave ideally?

Last updated: 18 hour ago

During a throttling process

Last updated: 18 hour ago

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

Last updated: 18 hour ago

Which of the following relation is correct?

Last updated: 18 hour ago

The expression which represents the pressure exerted by a gas is

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

The Clausius-Clapeyron equation is given by

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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 .

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

The following also gave two-constant equations of state.

Last updated: 18 hour ago

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

Last updated: 18 hour ago

How many types of feedwater heaters are present?

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

Carnot cycle is a reversible cycle.

Last updated: 18 hour ago

Processes inside a thermal energy reservoir are quasi-static.

Last updated: 18 hour ago

A thermal energy reservoir is a large body of

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

Which of the following is true?

Last updated: 18 hour ago

According to Joule’s experiments,

Last updated: 18 hour ago

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

Last updated: 18 hour ago

What reaction takes place during photosynthesis?

Last updated: 18 hour ago

Which among this is not an exothermic reaction?

Last updated: 18 hour ago

SI unit of enthalpy is

Last updated: 18 hour ago

What is the equation of entropy?

Last updated: 18 hour ago

Entropy occurs due to

Last updated: 18 hour ago

The equation for the average kinetic energy is

Last updated: 18 hour ago

During a fluid flow, the temperature is developed due to

Last updated: 18 hour ago

First law of thermodynamics deals with

Last updated: 18 hour ago

When the heat transferred isothermally

Last updated: 18 hour ago

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

Last updated: 18 hour ago

Which of the following statement is true?

Last updated: 18 hour ago

Phase change occurs at

Last updated: 18 hour ago

The greater the temperature, the is the vapour pressure.

Last updated: 18 hour ago

Which of the following statement is true?

Last updated: 18 hour ago

At a pressure below the triple point line,

Last updated: 18 hour ago

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

Last updated: 18 hour ago

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

Last updated: 18 hour ago

The reversible engines are

Last updated: 18 hour ago

Which of the following is the correct statement?

Last updated: 18 hour ago

The efficiency of the Carnot cycle may beincreased by

Last updated: 18 hour ago