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4

The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)

A. rγ - 1

B. 1 - rγ - 1

C. 1 - (1/r) γ/γ - 1

D. 1 - (1/r) γ - 1/ γ

Correct Answer :

D. 1 - (1/r) γ - 1/ γ


Related Questions

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4

Which of the following is the correct statement of the second law of thermodynamics?

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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4

If the rivets in adjacent rows are staggered and the outermost row has only one rivets, the arrangement of the rivets is called

A. Chain riveting

B. Zigzag riveting

C. Diamond riveting

D. Crisscross riveting

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4

If the depth is kept constant for a beam of uniform strength, then its width will vary in proportional to

A. Bending moment (i.e. M)

B. Bending moment² (i.e. M²)

C. Bending moment³ (i.e. M³)

D. Bending moment⁴ (i.e. M⁴)

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4

If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle

A. More

B. Less

C. Equal

D. Depends on other factors

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4

When a gas is heated at constant volume

A. Its temperature will increase

B. Its pressure will increase

C. Both temperature and pressure will increase

D. Neither temperature nor pressure will increase

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4

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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4

The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight

A. Of same magnitude as that of bar and applied at the lower end

B. Half the weight of bar applied at lower end

C. Half of the square of weight of bar applied at lower end

D. One fourth of weight of bar applied at lower end

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4

The ratio of the largest load in a test to the original cross-sectional area of the test piece is called

A. Elastic limit

B. Yield stress

C. Ultimate stress

D. Breaking stress

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4

The compression ratio for petrol engines is

A. 3 to 6

B. 5 to 8

C. 10 to 20

D. 15 to 30

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4

Which of the following process can be made reversible with the help of a regenerator?

A. Constant pressure process

B. Constant volume process

C. Constant pvn process

D. All of these

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4

The limit of eccentricity for no tensile conditions for a column of circular section of diameter (D) is

A. d/4

B. d/8

C. d/12

D. d/16

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4

Volumetric strain for a rectangular specimen of length l, breadth b and thickness t subjected to a pull of P is given by

A. e (1 - 2m)

B. e (1 - 2/m)

C. e (m - 2)

D. e (2/m - 1)

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4

When a body is subjected to biaxial stress i.e. direct stresses (σx) and (σy) in two mutually perpendicular planes accompanied by a simple shear stress (τxy), then maximum normal stress is

A. x + σy)/2 + (1/2) × √[(σx - σy)² + 4 τ²xy]

B. x + σy)/2 - (1/2) × √[(σx - σy)² + 4 τ²xy]

C. x - σy)/2 + (1/2) × √[(σx + σy)² + 4 τ²xy]

D. x - σy)/2 - (1/2) × √[(σx + σy)² + 4 τ²xy]

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4

If the value of n = 0 in the equation pvn = C, then the process is called

A. Constant volume process

B. Adiabatic process

C. Constant pressure process

D. Isothermal process

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4

The ratio of direct stress to volumetric strain in case of a body subjected to three mutually perpendicular stresses of equal intensity, is equal to

A. Young's modulus

B. Bulk modulus

C. Modulus of rigidity

D. Modulus of elasticity

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4

The heat flows from a cold body to a hot body with the aid of an external source. This statement is given by

A. Kelvin

B. Joule

C. Clausis

D. Gay-Lussac

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4

Proof resilience per material is known as

A. Resilience

B. Proof resilience

C. Modulus of resilience

D. Toughness

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4

When a gas is heated at constant pressure

A. Its temperature will increase

B. Its volume will increase

C. Both temperature and volume will increase

D. Neither temperature not volume will increase

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4

The throttling process is __________ process.

A. Reversible

B. Irreversible

C. Reversible or irreversible

D. None of these

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4

The maximum shear stress, in the given figure, is equal to __________ of the Mohr's circle.

A. Radius

B. Diameter

C. Circumference

D. Area

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4

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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4

The stress induced in a body due to suddenly applied load compared to when it is applied gradually is

A. Same

B. Half

C. Two times

D. Four times

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4

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

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4

The value of specific heat at constant pressure (cp) is __________ that of at constant volume (cv).

A. Less than

B. Equal to

C. More than

D. None of these

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4

Which of the following has the minimum atomic mass?

A. Oxygen

B. Sulphur

C. Nitrogen

D. Carbon

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4

When shear force at a point is zero, then bending moment is _________ at that point.

A. Zero

B. Minimum

C. Maximum

D. Infinity

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4

The intensity of stress which causes unit strain is called

A. Unit mass

B. Modulus of rigidity

C. Bulk modulus

D. Modulus of Elasticity

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4

Those substances which have so far not been resolved by any means into other substances of simpler form are called

A. Elements

B. Compounds

C. Atoms

D. Molecules

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4

One kg of carbon monoxide requires 4/7 kg of oxygen and produces

A. 11/3 kg of carbon dioxide gas

B. 7/3 kg of carbon monoxide gas

C. 11/7 kg of carbon dioxide gas

D. 8/3 kg of carbon monoxide gas

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4

The volumetric or molar specific heat at constant pressure is the product of

A. Molecular mass of the gas and the specific heat at constant volume

B. Atomic mass of the gas and the gas constant

C. Molecular mass of the gas and the gas constant

D. None of the above