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4

For a beam, as shown in the below figure, when the load W is applied in the centre of the beam, the maximum deflection is

A. Wl3 / 48EI

B. 5Wl3 / 384EI

C. Wl3 / 392EI

D. Wl3 / 384EI

Correct Answer :

A. Wl3 / 48EI


Related Questions

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4

The efficiency of Carnot cycle depends upon

A. Temperature limits

B. Pressure ratio

C. Volume compression ratio

D. Cut-off ratio and compression ratio

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4

The torque transmitted by a solid shaft of diameter (D) is (where τ = Maximum allowable shear stress)

A. π /4 × τ × D³

B. π /16 × τ × D³

C. π /32 × τ × D³

D. π /64 × τ × D³

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4

When the gas is heated at constant pressure, the heat supplied

A. Increases the internal energy of the gas

B. Increases the temperature of the gas

C. Does some external work during expansion

D. Both (B) and (C)

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4

For same compression ratio and for same heat added

A. Otto cycle is more efficient than Diesel cycle

B. Diesel cycle is more efficient than Otto cycle

C. Efficiency depends on other factors

D. Both Otto and Diesel cycles are equally efficient

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4

One molecule of oxygen consists of __________ atoms of oxygen.

A. 2

B. 4

C. 8

D. 16

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4

The amount of heat required to raise the temperature of 1 kg of water through one Kelvin is called

A. Specific heat at constant volume

B. Specific heat at constant pressure

C. kilo-Joule

D. None of these

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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

The efficiency of Diesel cycle depends upon

A. Temperature limits

B. Pressure ratio

C. Compression ratio

D. Cut-off ratio and compression ratio

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4

The ratio of elongation in a prismatic bar due to its own weight (W) as compared to another similar bar carrying an additional weight (W) will be

A. 1 : 2

B. 1 : 3

C. 1 : 4

D. 1 : 2.5

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4

When the gas is heated at constant volume, the heat supplied

A. Increases the internal energy of the gas and increases the temperature of the gas

B. Does some external work during expansion

C. Both (A) and (B)

D. None of these

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4

According to Avogadro's law

A. The product of the gas constant and the molecular mass of an ideal gas is constant

B. The sum of partial pressure of the mixture of two gases is sum of the two

C. Equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules

D. All of the above

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4

The pressure exerted by an ideal gas is ________ of the kinetic energy of all the molecules contained in a unit volume of gas.

A. One-half

B. One-third

C. Two-third

D. Three-fourth

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4

The change in the unit volume of a material under tension with increase in its Poisson's ratio will

A. Increase

B. Decrease

C. Remain same

D. Increase initially and then decrease

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4

An open system is one in which

A. Heat and work crosses the boundary of the system, but the mass of the working substance does not crosses the boundary of the system

B. Mass of the working substance crosses the boundary of the system but the heat and work does not crosses the boundary of the system

C. Both the heat and work as well as mass of the working substance crosses the boundary of the system

D. Neither the heat and work nor the mass of the working substance crosses the boundary of the system

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4

When a system changes its state from one equilibrium state to another equilibrium state, then the path of successive states through which the system has passed, is known as

A. Thermodynamic law

B. Thermodynamic process

C. Thermodynamic cycle

D. None 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

A riveted joint in which every rivet of a row is opposite to other rivet of the outer row, is known as

A. Chain riveted joint

B. Diamond riveted joint

C. Crisscross riveted joint

D. Zigzag riveted joint

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4

A column is said to be a short column, when

A. Its length is very small

B. Its cross-sectional area is small

C. The ratio of its length to the least radius of gyration is less than 80

D. The ratio of its length to the least radius of gyration is more than 80

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4

The total energy of a molecule is shared equally by the various degrees of freedom possessed by it. This law is known as

A. Law of equipartition of energy

B. Law of conservation of energy

C. Law of degradation of energy

D. None of these

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4

When coal is first dried and then crushed to a fine powder by pulverising machine, the resulting fuel is called

A. Wood charcoal

B. Bituminous coal

C. Briquetted coal

D. None of these

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4

The deformation per unit length is called

A. Tensile stress

B. Compressive stress

C. Shear stress

D. Strain

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4

Select the wrong statement

A. A Joule cycle consists of two constant volume and two isentropic processes.

B. An Otto cycle consists of two constant volume and two isentropic processes.

C. An Ericsson cycle consists of two constant pressure and two isothermal processes.

D. All of the above

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4

The value of gas constant (R) in S. I. units is

A. 0.287 J/kgK

B. 2.87 J/kgK

C. 28.7 J/kgK

D. 287 J/kgK

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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

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 ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will

A. Increase

B. Decrease

C. Remain unchanged

D. Increase/decrease depending on application

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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

If percentage reduction in area of a certain specimen made of material 'A' under tensile test is 60% and the percentage reduction in area of a specimen with same dimensions made of material 'B' is 40%, then

A. The material A is more ductile than material B

B. The material B is more ductile than material A

C. The ductility of material A and B is equal

D. The material A is brittle and material B is ductile

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4

Strain is equal to (where l = Original length, and δl = Change in length)

A. l/δl

B. δl/l

C. l.δl

D. l + δl

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4

The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is

A. 0.086

B. 1.086

C. 1.086

D. 4.086