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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

Correct Answer :

B. 1.086


Related Questions

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4

One kilowatt is equal to

A. 1 N-m/s

B. 100 N-m

C. 1000 N-m/s

D. 1 × 106 N-m/s

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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 air standard efficiency of an Otto cycle is given by (where r = Compression ratio, and γ = Ratio of specific heats)

A. 1 - rγ - 1

B. 1 + rγ - 1

C. 1 - (1/ rγ - 1)

D. 1 + (1/ rγ - 1)

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4

Which of the following statement is correct according to Clausis statement of second law of thermodynamics?

A. It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature.

B. It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.

C. It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle.

D. None of the above

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4

The stress necessary to initiate yielding is

A. Considerably greater than that necessary to continue it

B. Considerably lesser than that necessary to continue it

C. Greater than that necessary to stop it

D. Lesser than that necessary to stop it

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4

The efficiency of Diesel cycle increases with

A. Decrease in cut-off

B. Increase in cut-off

C. Constant cut-off

D. None of these

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4

One reversible heat engine operates between 1600 K and T2 K and another reversible heat engine operates between T2 K and 400 K. If both the engines have the same heat input and output, then temperature T2 is equal to

A. 800 K

B. 1000 K

C. 1200 K

D. 1400 K

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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 universal gas constant (or molar constant) of a gas is the product of

A. Molecular mass of the gas and the gas constant

B. Atomic mass of the gas and the gas constant

C. Molecular mass of the gas and the specific heat at constant pressure

D. Molecular mass of the gas and the specific heat at constant volume

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4

The tensile strength of the welded joint for double fillet is (where s = Leg or size of the weld, l = Length of weld, and σt = Allowable tensile stress for weld metal)

A. 0.5 s.l.σt

B. s.l.σt

C. √2 s.l.σt

D. 2.s.l.σt

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4

The heat flows from a cold body to a hot body with the aid of an external source. This statement is given by

A. Kelvin

B. Joule

C. Clausis

D. Gay-Lussac

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4

The bending stress in a beam is _________ section modulus.

A. Inversely proportional to two times

B. Directly proportional to

C. Inversely proportional to

D. None of these

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4

A key is subjected to side pressure as well at shearing forces. These pressures are called

A. Bearing stresses

B. Fatigue stresses

C. Crushing stresses

D. Resultant stresses

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4

Two shafts 'A' and 'B' transmit the same power. The speed of shaft 'A' is 250 r.p.m. and that of shaft 'B' is 300 r.p.m.

A. The shaft 'B' has the greater diameter

B. The shaft 'A' has the greater diameter

C. Both are of same diameter

D. None of these

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4

Which of the following statement is incorrect?

A. The liquid fuels consist of hydrocarbons.

B. The liquid fuels have higher calorific value than solid fuels.

C. The solid fuels have higher calorific value than liquid fuels.

D. A good fuel should have low ignition point.

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4

The isothermal and adiabatic processes are regarded as

A. Reversible process

B. Irreversible process

C. Reversible or irreversible process

D. None of these

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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

The maximum diameter of the hole that can be punched from a plate of maximum shear stress 1/4th of its maximum crushing stress of punch, is equal to (where t = Thickness of the plate)

A. t

B. 2t

C. 4t

D. 8t

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4

A cycle consisting of two adiabatic and two constant pressure processes is known as

A. Otto cycle

B. Ericsson cycle

C. Joule cycle

D. Stirling cycle

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4

The safe twisting moment for a compound shaft is equal to the

A. Maximum calculated value

B. Minimum calculated value

C. Mean value

D. Extreme value

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4

A circular shaft fixed at, A has diameter D for half of its length and diameter D/2 over the other half, as shown in the below figure. If the rotation of B relative to A is 0.1 radian, the rotation of C relative to B will be

A. 0.4 radian

B. 0.8 radian

C. 1.6 radian

D. 3.2 radian

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4

The property of a material by virtue of which a body returns to its original, shape after removal of the load is called

A. Plasticity

B. Elasticity

C. Ductility

D. Malleability

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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

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

Which of the following is a proper sequence?

A. Proportional limit, elastic limit, yielding, failure

B. Elastic limit, proportional limit, yielding, failure

C. Yielding, proportional limit, elastic limit, failure

D. None of the above

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4

The polytropic index (n) is given by

A. log (p1p2)/log (v1v2)

B. log (p2/ p1)/log (v1/ v2)

C. log (v1/ v2)/ log (p1/p2)

D. log [(p1v1)/(p2v2)]

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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

In the torsion equation T/J = τ/r = Gθ/ L, the term J/R is called

A. Shear modulus

B. Section modulus

C. Polar modulus

D. None of these

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4

Flow stress corresponds to

A. Fluids in motion

B. Breaking point

C. Plastic deformation of solids

D. Rupture stress

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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