Related Questions
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__________ is not used as a material of construction in thermocouples.
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Desalination of water
C. Means distillation of water
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The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours is __________ BTU/hr.
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Absolute zero, pressure will occur, when the molecular momentum of the system becomes zero. A liquid will cease to exist as liquid at
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4
Identify the correct statement with reference to the extractive metallurgy of aluminium.
A. The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3
B. Approximately 80% of the aluminium deposited on the cathode comes from cryolite
C. Sodium is deposited along with aluminium, but is immediately vaporised
D. Anode effect sets in when the cryolite concentration goes below 40%.
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4
Silicon percentage in silicon steel used for electrical equipments is about
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Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per of steel strip.
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Oxyacetylene reducing flame is used while carrying out welding on
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Heat flow across a hollow sphere of inner radius 'r1' and outer radius 'r2' is directly proportional to
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4
Pearlite comprises of
A. 87% cementite & 13% Fe
B. 87% ferrite & 13% cementite
C. 93.33% ferrite & 6.67% C
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Which of the following contributes maximum as main source of sulphur in the blast furnace charge?
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Which of the following is an unconventional source of energy?
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For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be __________ toys.
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Fire refining process is employed in case of
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Silicon percentage in the silicon steel used for electrical appliances/equipments is
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Glass reacts with
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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
The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe)
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4
The concentration of (H+) ions is 4 x 10-5 in a solution. Then pH of the solution will be (Given log 4 = 0.6)
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4
__________ fluid force is not considered in the Navier-Stokes equation.
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When the wavelength of incident X-rays increases, the angle of diffraction
D. Shows no systematic variation
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Secondary hardening in steels arises out of the
A. Precipitation of fine alloy carbides at high temperatures
B. Refinement of ferrite grain size by working
C. Decomposition of retained austenite upon heat treatment
D. Precipitation of complex inter-metallic upon heat treatment
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Coarse grained steels have
B. No tendency to distort
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Cold working of a material results in increase in hardness, which is termed as the __________ hardening.
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The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the
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The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400°C is
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Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than
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4
Super conduction in metals is observed at a temperature of __________ °K.
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4
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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A material is capable of resisting softening at high temperature, because of its property termed as