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4

The point of contraflexure is a point where

A. Shear force changes sign

B. Bending moment changes sign

C. Shear force is maximum

D. Bending moment is maximum

Correct Answer :

B. Bending moment changes sign


Related Questions

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4

One molecule of oxygen is __________ times heavier than the hydrogen atom.

A. 12

B. 14

C. 16

D. 32

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4

Diesel cycle consists of __________ processes.

A. Two constant volume and two isentropic

B. Two constant pressure and two isentropic

C. Two constant volume and two isothermal

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

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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 natural solid fuel is

A. Wood

B. Coke

C. Anthracite coal

D. Pulverised coal

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4

In order to prevent crushing of masonry at the base of the dam, the maximum stress should be __________ the permissible stress of the soil.

A. Equal to

B. Less than

C. More than

D. None of these

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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

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

Principal planes are planes having

A. Maximum shear stress

B. No shear stress

C. Minimum shear stress

D. None of the above

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4

In case of an under-reinforced beam, the depth of actual neutral axis is __________ that of the critical neutral axis.

A. Same as

B. Less than

C. Greater than

D. None of these

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4

In an irreversible process, there is a

A. Loss of heat

B. No loss of heat

C. Gain of heat

D. No gain of heat

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4

Which of the following gas has the highest calorific value?

A. Coal gas

B. Producer gas

C. Mond gas

D. Blast furnace gas

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4

Kelvin-Planck's law deals with

A. Conservation of work

B. Conservation of heat

C. Conversion of heat into work

D. Conversion of work into heat

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4

According to First law of thermodynamics,

A. Total internal energy of a system during a process remains constant

B. Total energy of a system remains constant

C. Workdone by a system is equal to the heat transferred by the system

D. Internal energy, enthalpy and entropy during a process remain 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

In an ideal gas turbine plant, it is assumed that the compression and expansion processes are

A. Isothermal

B. Isentropic

C. Polytropic

D. None of these

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4

When the gas is cooled at constant pressure,

A. Its temperature increases but volume decreases

B. Its volume increases but temperature decreases

C. Both temperature and volume increases

D. Both temperature and volume decreases

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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

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

The mass of excess air supplied is equal to

A. (23/100) × Mass of excess carbon

B. (23/100) × Mass of excess oxygen

C. (100/23) × Mass of excess carbon

D. (100/23) × Mass of excess oxygen

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4

The principal constituents of a fuel are

A. Carbon and hydrogen

B. Oxygen and hydrogen

C. Sulphur and oxygen

D. Sulphur and hydrogen

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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 distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and recondensed, then the liquid with the next higher boiling point is then evaporated and recondensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called

A. Cracking

B. Carbonisation

C. Fractional distillation

D. Full distillation

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4

When a beam is subjected to a bending moment, the strain in a layer is __________ the distance from the neutral axis.

A. Equal to

B. Directly proportional to

C. Inversely proportional to

D. Independent of

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4

A beam which is fixed at one end and free at the other is called

A. Simply supported beam

B. Fixed beam

C. Overhanging beam

D. Cantilever beam

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4

A cube subjected to three mutually perpendicular stress of equal intensity p expenses a volumetric strain

A. 3p/E × (2/m - 1)

B. 3p/E × (2 - m)

C. 3p/E × (1 - 2/m)

D. E/3p × (2/m - 1)

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4

Which of the following is correct?

A. Absolute pressure = Gauge pressure + Atmospheric pressure

B. Gauge pressure = Absolute pressure + Atmospheric pressure

C. Atmospheric pressure = Absolute pressure + Gauge pressure

D. Absolute pressure = Gauge pressure - Atmospheric pressure

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4

A process, in which the gas is heated or expanded in such a way that the product of its pressure and volume remains constant, is called

A. Isothermal process

B. Hyperbolic process

C. Adiabatic process

D. Polytropic process

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4

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

A. 11/7

B. 9/7

C. 4/7

D. All of the above

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4

The bending moment of a cantilever beam of length l and carrying a uniformly distributed load of w per unit length is __________ at the fixed end.

A. wl/4

B. wl/2

C. wl

D. wl²/2