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4

The given figure shows the Mohr's circle of stress for two unequal and like principal stresses (σx and σy) acting at a body across two mutually perpendicular planes. The normal stress on an oblique section making an angle θ with the minor principle plane is given by

A. OC

B. OP

C. OQ

D. PQ

Correct Answer :

C. OQ


Related Questions

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4

The strain energy stored in a solid circular shaft subjected to shear stress (τ), is: (Where G = Modulus of rigidity for the shaft material)

A. τ²/ 2G × Volume of shaft

B. τ/ 2G × Volume of shaft

C. τ²/ 4G × Volume of shaft

D. τ/ 4G × Volume of shaft

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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 thickness of a thin cylindrical shell with hemispherical ends is __________ that of spherical ends.

A. Equal to

B. More than

C. Less than

D. None of these

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4

Steam coal is a

A. Pulverised coal

B. Brown coal

C. Coking bituminous coal

D. Non-coking bituminous coal

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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

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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4

Workdone in a free expansion process is

A. Zero

B. Minimum

C. Maximum

D. Positive

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4

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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4

The condition for the reversibility of a cycle is

A. The pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process

B. All the processes, taking place in the cycle of operation, must be extremely slow

C. The working parts of the engine must be friction free

D. All of the above

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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

A process, in which the working substance neither receives nor gives out heat to its surroundings during its expansion or compression, is called

A. Isothermal process

B. Hyperbolic process

C. Adiabatic process

D. Polytropic process

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4

According to Kelvin-Planck's statement, a perpetual motion of the __________ is impossible.

A. First kind

B. Second kind

C. Third kind

D. None of these

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4

The state of stress at a point in a loaded member is shown in the below figure. The magnitude of maximum shear stress is

A. 10 MPa

B. 30 MPa

C. 50 MPa

D. 100 MPa

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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

The columns whose slenderness ratio is less than 80, are known as

A. Short columns

B. Long columns

C. Weak columns

D. Medium columns

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4

The entropy may be expressed as a function of

A. Pressure and temperature

B. Temperature and volume

C. Heat and work

D. All of these

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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

The value of Poisson's ratio for steel is between

A. 0.01 to 0.1

B. 0.23 to 0.27

C. 0.25 to 0.33

D. 0.4 to 0.6

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4

When a bar is subjected to a change of temperature and its deformation is prevented, the stress induced in the bar is

A. Tensile stress

B. Compressive stress

C. Shear stress

D. Thermal stress

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4

Which of the following is an intensive property of a thermodynamic system?

A. Volume

B. Temperature

C. Mass

D. Energy

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4

The torsional rigidity of a shaft is expressed by the

A. Maximum torque it can transmit

B. Number of cycles it undergoes before failure

C. Elastic limit up to which it resists torsion, shear and bending stresses

D. Torque required to produce a twist of one radian per unit length of shaft

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4

Petrol is distilled at

A. 65° to 220°C

B. 220° to 345°C

C. 345° to 470°C

D. 470° to 550°C

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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

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

Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle

A. Combustion is at constant volume

B. Expansion and compression are isentropic

C. Maximum temperature is higher

D. Heat rejection is lower

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4

When both ends of a column are fixed, the effective length is

A. Its own length

B. Twice its length

C. Half its length

D. 1/√2 × its length

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4

The ultimate analysis of coal consists of the determination of the percentage of

A. Carbon

B. Hydrogen and nitrogen

C. Sulphur and ash

D. All of these

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4

Stirling and Ericsson cycles are

A. Reversible cycles

B. Irreversible cycles

C. Semi-reversible cycles

D. Adiabatic irreversible cycles

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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

The unit of energy is S. I. units is

A. Joule (J)

B. Joule metre (Jm)

C. Watt (W)

D. Joule/metre (J/m)