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4

The variables which control the physical properties of a perfect gas are

A. Pressure exerted by the gas

B. Volume occupied by the gas

C. Temperature of the gas

D. All of these

Correct Answer :

D. All of these


Related Questions

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4

Which is the false statement about true stress strain method?

A. It does not exist

B. It is more sensitive to changes in both metallurgical and mechanical conditions

C. It gives a more accurate picture of the ductility

D. It can be correlated with stress strain values in other tests like torsion, impact, combined stress tests etc.

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4

A riveted joint in which the number otrivets decrease from innermost to outer most rows is called

A. Chain riveted joint

B. Diamond riveted joint

C. Crisscross riveted joint

D. Zigzag riveted joint

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4

For the same maximum pressure and temperature,

A. Otto cycle is more efficient than Diesel cycle

B. Diesel cycle is more efficient than Otto cycle

C. Dual cycle is more efficient than Otto and Diesel cycles

D. Dual cycle is less efficient than Otto and Diesel cycles

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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

A fletched beam is used to

A. Change the shape of the beam

B. Effect the saving in material

C. Equalise the strength in tension and compression

D. Increase the cross-section of the beam

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4

Select the correct statement as per Charles' law

A. p.v = constant, if T is kept constant

B. v/T = constant, if p is kept constant

C. p/T = constant, if v is kept constant

D. T/p = constant, if v is kept constant

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4

A cycle consisting of two constant pressure and two isentropic processes is known as

A. Carnot cycle

B. Stirling cycle

C. Otto cycle

D. None of these

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4

One kg of carbon monoxide requires __________ kg of oxygen to produce 11/7 kg of carbon dioxide gas.

A. 4/7

B. 11/4

C. 9/7

D. All of these

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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 is the incorrect statement about Carnot cycle?

A. It is used as the alternate standard of comparison of all heat engines.

B. All the heat engines are based on Carnot cycle.

C. It provides concept of maximising work output between the two temperature limits.

D. All of the above

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4

Workdone in a free expansion process is

A. Zero

B. Minimum

C. Maximum

D. Positive

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4

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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4

A pressure vessel is said to be a thick shell, when

A. It is made of thick sheets

B. The internal pressure is very high

C. The ratio of wall thickness of the vessel to its diameter is less than 1/10.

D. The ratio of wall thickness of the vessel to its diameter is greater than 1/10.

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4

When a perfect gas is expanded through an aperture of minute dimensions, the process is known as

A. Isothermal process

B. Adiabatic process

C. Free expansion process

D. Throttling process

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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

The general law for the expansion or compression of gases, is

A. pv = C

B. pv = m R T

C. pvn = C

D. pvγ = C

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4

In the below figure, the stress corresponding to point D is

A. Yield point stress

B. Breaking stress

C. Ultimate stress

D. Elastic limit

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4

Youngs modulus of a wire is defined as the stress which will increase the length of wire compared to its original length by

A. Half

B. Same amount

C. Double

D. One-fourth

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4

Charles' law states that all perfect gases change in volume by __________ of its original volume at 0°C for every 1°C change in temperature, when pressure remains constant.

A. 1/27th

B. 1/93th

C. 1/173th

D. 1/273th

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4

When it is indicated that a member is elastic, it means that when force is applied, it will

A. Not deform

B. Be safest

C. Stretch

D. Not stretch

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4

The maximum tangential stress in a thick cylindrical shell is always _________ the internal pressure acting on the shell.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

The neutral axis of a transverse section of a beam passes through the centre of gravity of the section and is

A. In the vertical plane

B. In the horizontal plane

C. In the same plane in which the beam bends

D. At right angle to the plane in which the beam bends

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4

Which of the following is the correct statement?

A. For a given compression ratio, both Otto and Diesel cycles have the same efficiency.

B. For a given compression ratio, Otto cycle is more efficient than Diesel cycle.

C. For a given compression ratio, Diesel cycle is more efficient than Otto cycle.

D. The efficiency of Otto or Diesel cycle has nothing to do with compression ratio.

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4

A simply supported beam with a gradually varying load from zero at B and w per unit length at A is shown in the below figure. The shear force at B is equal to

A. wl/6

B. wl/3

C. wl

D. 2wl/3

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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

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

Diesel cycle consists of following four processes

A. Two isothermal 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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4

When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel, the process is known as __________ of fuel.

A. Atomisation

B. Carbonisation

C. Combustion

D. None of these

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4

The compression ratio is the ratio of

A. Swept volume to total volume

B. Total volume to swept volume

C. Swept volume to clearance volume

D. Total volume to clearance volume

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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