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Which of the following gas is mostly used in town for street and domestic lighting and heating?

A. Producer gas

B. Coal gas

C. Mond gas

D. Coke oven gas

Correct Answer :

B. Coal gas


Related Questions

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The absolute zero pressure will be

A. When molecular momentum of the system becomes zero

B. At sea level

C. At the temperature of - 273 K

D. At the centre of the earth

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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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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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Percentage reduction of area in performing tensile test on cast iron may be of the order of

A. 50 %

B. 25 %

C. 0 %

D. 15 %

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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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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

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A steel bar of 5 mm is heated from 25°C to 45°C and it is free to expand. The bar will induce

A. No stress

B. Shear stress

C. Tensile stress

D. Compressive stress

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The heat energy stored in the gas and used for raising the temperature of the gas is known as

A. External energy

B. Internal energy

C. Kinetic energy

D. Molecular energy

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Select the correct statement as per Charles' law

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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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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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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The relation between equivalent length (L) and actual length (l) of a column for both ends fixed is

A. L = l/2

B. L = l/√2

C. L = l

D. L = 2l

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Coke is produced

A. When coal is first dried and then crushed to a fine powder by pulverising machine

B. From the finely ground coal by moulding under pressure with or without a binding material

C. When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel

D. By heating wood with a limited supply of air to a temperature not less than 280°C

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The property of a material by virtue of which it can be beaten or rolled into plates is called

A. Malleability

B. Ductility

C. Plasticity

D. Elasticity

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The measurement of a thermodynamic property known as temperature is based on

A. Zeroth law of thermodynamics

B. First law of thermodynamics

C. Second law of thermodynamics

D. None of these

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The shear force at the centre of a simply supported beam with a gradually varying load from zero at both ends to w per metre at the centre, is

A. Zero

B. wl/4

C. wl/2

D. wl²/2

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A coil is cut into two halves, the stiffness of cut coil will be

A. Double

B. Half

C. Same

D. None of these

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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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The property of a working substance which increases or decreases as the heat is supplied or removed in a reversible manner, is known as

A. Enthalpy

B. Internal energy

C. Entropy

D. External energy

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The extremeties of any diameter on Mohr's circle represent

A. Principal stresses

B. Normal stresses on planes at 45°

C. Shear stresses on planes at 45°

D. Normal and shear stresses on a plane

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According to Regnault's law, the specific heat at constant pressure (cp) and specific heat at constant volume (cv) _________ with the change in pressure and temperature of the gas.

A. Change

B. Do not change

C. Both (A) and (B)

D. None of these

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The variables which control the physical properties of a perfect gas are

A. Pressure exerted by the gas

B. Volume occupied by the gas

C. Temperature of the gas

D. All of these

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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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A composite bar made up of steel and copper bars of equal lengths are heated through 100°C. The stresses developed shall be

A. Tensile in both the material

B. Tensile in steel and compressive in copper

C. Compressive in steel and tensile in copper

D. Compressive in both the materials

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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

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The buckling load for a given material depends on

A. Slenderness ratio and area of cross-section

B. Poisson's ratio and modulus of elasticity

C. Slenderness ratio and modulus of elasticity

D. Slenderness ratio, area of cross-section and modulus of elasticity

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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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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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Carbonisation of coal consists of

A. Drying and crushing the coal to a fine powder

B. Moulding the finely ground coal under pressure with or without a binding material

C. Heating the wood with a limited supply of air to temperature not less than 280°C

D. None of the above

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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