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While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the
C. Better finish and surface appearance
D. High plastic deformation
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4
High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27°C with relative humidity ranging from __________ percent.
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4
Which of the following phenomenon/ phenomena is/are diffusion controlled?
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Yield strength of a material is determined by the __________ test.
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4
Increase in the entropy of a system represents the
B. Decrease in system pressure
C. Increase in the availability of energy
D. Increase in the temperature
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4
The best lubricants for a machine working at high temperature & load is
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4
Which of the following materials has the least scrap value?
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Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the mixture. Dryness factor of steam is measured by a __________ calorimeter.
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While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen flame is about __________ °C.
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A solar cell converts the sunlight directly into __________ energy.
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Which of the following is prone to cup and cone fracture?
C. Round specimen of ductile metal
D. Flat tensile specimen of ductile metal
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Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans?
A. Emissivity of pipe surface
B. Diameter & length of the pipe
C. Temperature of hot pipe surface & that of air in the room
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4
Silicon percentage in acid resistant cast iron is about
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4
Stainless steel is welded with difficulty because of
A. Its high melting temperature
D. Chromium carbide formation
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What is the percentage of chromium in 18-4-1 high speed steel?
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Aluminium is extracted from
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Property responsible for the talcum powder to cling to the skin is the
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Dephosphorization of molten pig iron is favoured by
A. Oxidising and basic slag
B. Reducing and basic slag
C. High activity co-efficient of phosphorous in metal
D. Oxidising and neutral slag
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Which of the following commonly used condenser tube materials has the lowest thermal conductivity?
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4
Dry saturated steam can be converted into superheated steam by
A. Increasing its cross-sectional area of flow
B. Passing it through a pressure reducing valve
C. Forcing it downwards through a vertical tube
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Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)
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Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are __________ respectively.
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The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the __________ of the slag.
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Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50% B is
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__________ test is the appropriate test to determine whether a material is ductile or brittle.
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4
The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler.
B. Evaporation efficiency
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The most important consideration in value engineering is the
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The effect of friction on the flow of steam through a nozzle is to decrease the __________ of steam.
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Cobalt - 60 is used as a source of __________ in medical therapy & industrial radiography.
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Which of the following is the correct nature of shear stress distribution along the cross section in a horizontal circular pipe under steady state fluid flow condition?