Related Questions
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Which one of the following is incombustible?
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Transformation range for ferrous material is the temperature interval during which __________ is formed during its heating.
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Electrolytic reduction cell used for conversion of calcined Al2O3 to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to
A. Achieve very high purity of aluminium (99.9%)
B. Keep the electrolyte in liquid condition by the generation of heat
C. Electrolytically dissociate alumina
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4
Globular form of cementite is formed during the __________ process.
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__________ of air does not increase with increase in temperature.
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Difference at any instant between the value of the controlled variable and the set point is called the
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Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs?
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The friction factor for the turbulent fluid flow in a rough pipe does not depend upon the
A. Pipe roughness & pipe diameter
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Which of the following is not used as a bearing material?
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Flue gases pass through the following boiler accessories in a high pressure natural circulation boiler.
A. Induced draft fan
B. Economiser
C. Air preheater
D. Steam superheater Which of the following gives the correct sequence of flow of the flue gases through the above mentioned boiler accessories?
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4
Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its
C. Resistance to vegetable acids as the tin plate are commercially used in 'canning' industry
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4
Tesla metre per ampere (T. m/A) is the unit for the measurement of
A. Magnetic susceptibility
C. Permeability of free space
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Tempering of a material does not improve its
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The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability?
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Magnesium is present in
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Material of construction of foundry crucible is
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__________ joint is mostly used for joining pipes carrying water at low pressure.
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Change in volume of metals from absolute zero temperature to their melting points is
A. Almost same for all metals
B. Different for different metals
C. Less for low melting point metals
D. Less for high melting point metals
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__________ of grey cast iron produces white cast iron.
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4
The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong
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__________ is not a case hardening process.
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In the blast furnace, incorporation of water vapour in the blast gives the following effect.
A. Increases the reducing potential of the gas
B. Increases the flame temperature
C. No significant change occurs
D. Increases the hydrogen content in the metal
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Which of the following does not have a sharp melting point?
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For separating small pieces of metal from engine oil of a car, the best separating technique is the
D. Fractional distillation
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Chromium molybdenum steel cannot be welded using __________ welding.
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__________ rubber is generally used for making 'O' rings used for vacuum sealings.
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4
Circular cross section machine parts which are symmetrical about the axis of rotation are made by hot
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4
Blow off cock is provided in steam boiler to
A. Guard the boiler in case of abnormal rise in steam pressure
B. Drain out water and sludge during its repair
C. Regulate the supply of water in boiler
D. Put out the fire in the furnace when the water level in the boiler falls to unsafe limit
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Increase in temperature, in general results in the
A. Decrease in the viscosities of both liquids & gases
B. Increase in the viscosities of both liquids & gases
C. Increase in the viscosity of liquids and decrease in that of gases
D. Decrease in the viscosity of liquids and increase in that of gases
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The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.