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Current Affairs January 2024

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4

The buckling load for a given column depends upon

A. Area of cross-section of the column

B. Length and least radius of gyration of the column

C. Modulus of elasticity for the material of the column

D. All of the above

Correct Answer :

D. All of the above


Related Questions

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The deformation per unit length is called

A. Tensile stress

B. Compressive stress

C. Shear stress

D. Strain

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4

The shape of cantilever for uniformly distributed load will be

A. Straight line

B. Parabolic

C. Elliptical

D. Cubic

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4

Euler's formula holds good only for

A. Short columns

B. Long columns

C. Both short and long columns

D. Weak columns

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4

The bending equation is

A. M/I = σ/y = E/R

B. T/J = τ/R = Cθ/l

C. M/R = T/J = Cθ/l

D. T/l= τ/J = R/Cθ

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4

When the expansion or compression takes place according to the law pvn = C, the process is known as

A. Isothermal process

B. Adiabatic process

C. Hyperbolic process

D. Polytropic process

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4

Modular ratio of two materials is the ratio of

A. Strains

B. Stress and strain

C. Shear stress and shear strain

D. Moduli and elasticity

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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

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

The neutral axis of the cross-section a beam is that axis at which the bending stress is

A. Zero

B. Minimum

C. Maximum

D. Infinity

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4

The shear force diagram of a cantilever beam of length l and carrying a uniformly distributed load of w per unit length will be

A. A right angled triangle

B. An isosceles triangle

C. An equilateral triangle

D. A rectangle

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4

One kg of carbon requires 4/3 kg of oxygen and produces __________ kg of carbon monoxide gas.

A. 8/3

B. 11/3

C. 11/7

D. 7/3

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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

In the tensile test, the phenomenon of slow extension of the material, i. e. stress increasing with the time at a constant load is called

A. Creeping

B. Yielding

C. Breaking

D. Plasticity

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4

The section modulus of a circular section about an axis through its C.G., is

A. πd²/4

B. πd²/16

C. πd3/16

D. πd3/32

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4

The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is always __________ one.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

The atomic mass of oxygen is

A. 12

B. 14

C. 16

D. 32

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4

The absolute zero temperature is taken as

A. -273°C

B. 73°C

C. 237°C

D. -237°C

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4

The heat and work are mutually convertible. This statement is called __________ law of thermodynamics.

A. Zeroth

B. First

C. Second

D. Third

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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

One kg of ethylene (C2H4) requires 2 kg of oxygen and produces 22/7 kg of carbon dioxide and __________ kg of water or steam.

A. 9/7

B. 11/7

C. 7/4

D. 1/4

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4

The efficiency of the dual combustion cycle for the same compression ratio is __________ Diesel cycle.

A. Greater than

B. Less than

C. Equal to

D. None of these

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4

In a reversible adiabatic process, the ratio of T1/T2 is equal to

A. (p2/p1)γ - 1/ γ

B. (p1/p2)γ - 1/ γ

C. (v2/v1)γ - 1/ γ

D. (v1/v2)γ - 1/ γ

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4

Resilience is the

A. Energy stored in a body when strained within elastic limits

B. Energy stored in a body when strained up to the breaking of the specimen maximum strain

C. Energy which can be stored in a body

D. None of the above

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4

Which of the following cycles is not a reversible cycle?

A. Carnot

B. Ericsson

C. Stirling

D. None of the above

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4

Otto cycle consists of

A. Two constant volume and two isentropic processes

B. Two constant pressure and two isentropic processes

C. Two constant volume and two isothermal processes

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

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4

The molecular mass expressed in gram (i.e. 1 g - mole) of all gases, at N. T. P., occupies a volume of

A. 0.224 litres

B. 2.24 litres

C. 22.4 litres

D. 224 litres

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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)

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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 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

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