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Which of the following statement is correct?

A. The increase in entropy is obtained from a given quantity of heat at a low temperature.

B. The change in entropy may be regarded as a measure of the rate of the availability or unavailability of heat for transformation into work.

C. The entropy represents the maximum amount of work obtainable per degree drop in temperature.

D. All of the above

Correct Answer :

D. All of the above


Related Questions

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The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will

A. Increase

B. Decrease

C. Remain unchanged

D. Increase/decrease depending on application

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The deformation of a bar under its own weight compared to the deformation of same body subjected to a direct load equal to weight of the body is

A. Same

B. Double

C. Half

D. Four times

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Otto cycle is also known as

A. Constant pressure cycle

B. Constant volume cycle

C. Constant temperature cycle

D. Constant temperature and pressure cycle

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The ratio of elongation in a prismatic bar due to its own weight (W) as compared to another similar bar carrying an additional weight (W) will be

A. 1 : 2

B. 1 : 3

C. 1 : 4

D. 1 : 2.5

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4

The value of shear stress which is induced in the shaft due to the applied couple varies

A. From maximum at the centre to zero at the circumference

B. From zero at the centre to maximum at the circumference

C. From maximum at the centre to minimum at the circumference

D. From minimum at the centre to maximum at the circumference

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All perfect gases change in volume by 1/273th of its original volume at 0°C for every 1°C change in temperature, when the pressure remains constant. This statement is called

A. Boyle's law

B. Charles' law

C. Gay-Lussac law

D. Joule's law

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The entropy __________ in an irreversible cyclic process.

A. Remains constant

B. Decreases

C. Increases

D. None of these

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Principal planes are planes having

A. Maximum shear stress

B. No shear stress

C. Minimum shear stress

D. None of the above

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A cycle consisting of two isothermal and two isentropic processes, is known as

A. Carnot cycle

B. Stirling cycle

C. Ericsson cycle

D. Joule cycle

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When the gas is cooled at constant pressure,

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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A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as

A. Reversible cycle

B. Irreversible cycle

C. Thermodynamic cycle

D. None of these

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The process is adiabatic, if the value of n in the equation pvn = C, is

A. 0

B. 1

C. γ

D.

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A molecule consisting of one atom is known as

A. Mono-atomic

B. Di-atomic

C. Tri-atomic

D. Poly-atomic

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An open cycle gas turbine works on

A. Carnot cycle

B. Otto cycle

C. Joule's cycle

D. Stirling cycle

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The __________ states that change of internal energy of a perfect gas is directly proportional to the change of temperature.

A. Boyle's law

B. Charle's law

C. Gay-Lussac law

D. Joule's law

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The atomic mass of sulphur is

A. 12

B. 14

C. 16

D. 32

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Otto cycle consists of following four processes

A. Two isothermals and two isentropic

B. Two isentropic and two constant volumes

C. Two isentropic, one constant volume and one constant pressure

D. Two isentropic and two constant pressures

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When a gas is heated, change takes place in

A. Pressure

B. Volume

C. Temperature

D. All of these

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The hard coke is obtained when carbonisation of coal is carried out at

A. 300° to 500°C

B. 500° to 700°C

C. 700° to 900°C

D. 900° to 1100°C

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Proof resilience per material is known as

A. Resilience

B. Proof resilience

C. Modulus of resilience

D. Toughness

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The property of a material which allows it to be drawn into a smaller section is called

A. Plasticity

B. Ductility

C. Elasticity

D. Malleability

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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)

A. (p1 v1 - p2 v2)/(γ - 1)

B. [m R (T1 - T2)] /(γ - 1)

C. [m R T1/(γ - 1)][1 - (p2 v2 /p1 v1)]

D. All of these

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Which of the following statement is incorrect?

A. The liquid fuels have higher calorific value than solid fuels

B. The solid fuels have higher calorific value than liquid fuels

C. A good fuel should have low ignition point

D. The liquid fuels consist of hydrocarbons

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The general law of expansion or compression is pvn = C, The process is said to be hyperbolic, if n is equal to

A. 0

B. 1

C. γ

D.

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Elasticity of Mild Steel specimen is defined by

A. Hookes law

B. Yield point

C. Plastic flow

D. Proof stress

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Producer gas is obtained by

A. Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast

B. Carbonisation of bituminous coal

C. Passing steam over incandescent coke

D. Passing air and a large amount of steam over waste coal at about 650°C

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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

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

A. Zeroth law of thermodynamics

B. First law of thermodynamics

C. Second law of thermodynamics

D. None of these

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The isothermal and adiabatic processes are regarded as

A. Reversible process

B. Irreversible process

C. Reversible or irreversible process

D. None of these

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A definite area or a space where some thermodynamic process takes place is known as

A. Thermodynamic system

B. Thermodynamic cycle

C. Thermodynamic process

D. Thermodynamic law