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4

The heat supplied to the gas at constant volume is (where m = Mass of gas, cv = Specific heat at constant volume, cp = Specific heat at constant pressure, T2 - T1 = Rise in temperature, and R = Gas constant)

A. mR (T2 - T1)

B. mcv (T2 - T1)

C. mcp (T2 - T1)

D. mcp (T2 + T1)

Correct Answer :

B. mcv (T2 - T1)


Related Questions

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4

The root mean square velocity of the gas molecules is given by (where k = Boltzmann's constant, T = Absolute temperature, and m = Mass of one molecule of a gas)

A. √(KT/m)

B. √(2KT/m)

C. √(3KT/m)

D. √(5KT/m)

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4

The safe twisting moment for a compound shaft is equal to the

A. Maximum calculated value

B. Minimum calculated value

C. Mean value

D. Extreme value

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4

The value of cp/cv for air is

A. 1

B. 1.4

C. 1.45

D. 2.3

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4

The heat and mechanical energies are mutually convertible. This statement was established by

A. Boyle

B. Charles

C. Joule

D. None of these

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4

In open cycle gas turbine plants

A. The indirect heat exchanger and cooler is avoided

B. Direct combustion system is used

C. A condenser is used

D. All of the above

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4

When the gas is heated at constant pressure, the heat supplied

A. Increases the internal energy of the gas

B. Increases the temperature of the gas

C. Does some external work during expansion

D. Both (B) and (C)

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4

A column is said to be a short column, when

A. Its length is very small

B. Its cross-sectional area is small

C. The ratio of its length to the least radius of gyration is less than 80

D. The ratio of its length to the least radius of gyration is more than 80

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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

The total strain energy stored in a body is termed a

A. Resilience

B. Proof resilience

C. Modulus of resilience

D. Toughness

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4

High air-fuel ratio in gas turbines

A. Increases power output

B. Improves thermal efficiency

C. Reduces exhaust temperature

D. Do not damage turbine blades

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4

A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum normal stress will be

A. 400 MPa

B. 500 MPa

C. 900 MPa

D. 1400 MPa

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4

For which material the Poisson's ratio is more than unity

A. Steel

B. Copper

C. Aluminium

D. None of the above

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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 hyperbolic process is governed by

A. Boyle's law

B. Charles' law

C. Gay-Lussac law

D. Avogadro's law

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4

The property of a material by virtue of which it can be beaten or rolled into plates is called

A. Malleability

B. Ductility

C. Plasticity

D. Elasticity

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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

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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4

Shear stress induced in a shaft subjected to tension will be

A. Maximum at periphery and zero at center

B. Maximum at center

C. Uniform throughout

D. None of the above

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4

The deformation of a bar under its own weight is _________ the deformation, if the same body is subjected to a direct load equal to weight of the body.

A. Equal to

B. Half

C. Double

D. Quadruple

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4

The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is

A. Equal to one

B. Less than one

C. Greater than one

D. None of these

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4

Energy can neither be created nor destroyed, but it can be transformed from one form to another. This statement is known as

A. Zeroth law of thermodynamics

B. First law of thermodynamics

C. Second law of thermodynamics

D. Kinetic theory of gases

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4

The compression ratio for petrol engines is

A. 3 to 6

B. 5 to 8

C. 15 to 20

D. 20 to 30

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4

The efficiency of Diesel cycle depends upon

A. Temperature limits

B. Pressure ratio

C. Compression ratio

D. Cut-off ratio and compression ratio

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4

The assumption made in Euler's column theory is that

A. The failure of column occurs due to buckling alone

B. The length of column is very large as compared to its cross-sectional dimensions

C. The column material obeys Hooke's law

D. All of the above

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4

The efficiency of the Carnot cycle may be increased by

A. Increasing the highest temperature

B. Decreasing the highest temperature

C. Increasing the lowest temperature

D. Keeping the lowest temperature constant

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4

Modulus of rigidity is defined as the ratio of

A. Longitudinal stress to longitudinal strain

B. Volumetric stress to volumetric strain

C. Lateral stress to Lateral strain

D. Shear stress to shear strain

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4

The mass of carbon per kg of flue gas is given by

A. (11/3) CO2 + (3/7) CO

B. (3/7) CO2 + (11/3) CO

C. (7/3) CO2 + (3/11) CO

D. (3/11) CO2 + (7/3) CO

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4

Which of the following gas is mostly used in town for street and domestic lighting and heating?

A. Producer gas

B. Coal gas

C. Mond gas

D. Coke oven gas

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4

Strain re-setters are used to

A. Measure shear strain

B. Measure linear strain

C. Measure volumetric strain

D. Relieve strain

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4

True stress strain-curve for materials is plotted between

A. Load/original cross-sectional area and change in length/original length

B. Load/ instantaneous cross-sectional area and loge (original area/ instantaneous area)

C. Load/ instantaneous cross-sectional area and change in length/ original length

D. Load/ instantaneous area and instantaneous area/original area