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4

A thin cylindrical shell of diameter (D) and thickness (t) is subjected to an internal pressure (p). The ratio of longitudinal strain to volumetric strain is

A. (m - 1)/ (2m - 1)

B. (2m - 1)/ (m - 1)

C. (m - 2)/ (3m - 4)

D. (m - 2)/ (5m - 4)

Correct Answer :

D. (m - 2)/ (5m - 4)


Related Questions

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4

For a perfect gas, according to Boyle's law (where p = Absolute pressure, v = Volume, and T = Absolute temperature)

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 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

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

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

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

Which of the following is a reversible non-flow process?

A. Isochoric process

B. Isobaric process

C. Hyperbolic process

D. All of these

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4

The absolute zero pressure will be

A. When molecular momentum of the system becomes zero

B. At sea level

C. At the temperature of - 273 K

D. At the centre of the earth

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4

The maximum stress produced in a bar of tapering section is at

A. Smaller end

B. Larger end

C. Middle

D. Anywhere

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4

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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4

The buckling load for a given material depends on

A. Slenderness ratio and area of cross-section

B. Poisson's ratio and modulus of elasticity

C. Slenderness ratio and modulus of elasticity

D. Slenderness ratio, area of cross-section and modulus of elasticity

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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

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

Stirling cycle consists of

A. Two constant volume and two isentropic processes

B. Two constant volume and two isothermal processes

C. Two constant pressure and two isothermal processes

D. One constant volume, one constant pressure and two isentropic processes

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4

First law of thermodynamics deals with

A. Conservation of heat

B. Conservation of momentum

C. Conservation of mass

D. Conservation of energy

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4

A close cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.

A. Same

B. Lower

C. Higher

D. None of these

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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

The energy absorbed in a body, when it is strained within the elastic limits, is known as

A. Strain energy

B. Resilience

C. Proof resilience

D. Modulus of resilience

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4

A composite shaft consisting of two stepped portions having spring constants K₁ and K₂ is held between two rigid supports at the ends. Its equivalent spring constant is

A. K₁ K₂

B. (K₁ + K₂)/ 2

C. (K₁ + K₂)/ K₁ K₂

D. K₁ K₂/ (K₁ + K₂)

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4

Young's modulus is defined as the ratio of

A. Volumetric stress and volumetric strain

B. Lateral stress and lateral strain

C. Longitudinal stress and longitudinal strain

D. Shear stress to shear strain

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4

A steel bar of 5 mm is heated from 25°C to 45°C and it is free to expand. The bar will induce

A. No stress

B. Shear stress

C. Tensile stress

D. Compressive stress

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4

The efficiency of Stirling cycle is __________ Carnot cycle.

A. Greater than

B. Less than

C. Equal to

D. None of these

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4

In a free expansion process,

A. W1 - 2 = 0

B. Q1 - 2 = 0

C. dU = 0

D. All of these

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4

The sum of internal energy (U) and the product of pressure and volume (p.v) is known as

A. Workdone

B. Entropy

C. Enthalpy

D. None of these

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4

In a belt drive, the pulley diameter is doubled, the belt tension and pulley width remaining same. The changes required in key will be

A. Increase key length

B. Increase key depth

C. Increase key width

D. Double all the dimensions

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4

The fuel mostly used in steam boilers is

A. Brown coal

B. Peat

C. Coking bituminous coal

D. Non-coking bituminous coal

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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

The state of a substance whose evaporation from its liquid state is complete, is known as

A. Vapour

B. Perfect gas

C. Air

D. Steam

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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

The bending moment at a point on a beam is the algebraic ________ of all the moments on either side of the point.

A. Sum

B. Difference

C. Multiplication

D. None of the above

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4

The efficiency of Diesel cycle with decrease in cut-off

A. Increases

B. Decreases

C. First increases and then decreases

D. First decreases and then increases