As per international norms, the maximum permissible value of noise level in the industrial environment is __________ decibels as measured at a distance of 1.5 metres from the source of noise.
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The following type of bonding is strongly directional in solids.
A. Vander Waal's
B. Ionic
C. Metallic
D. Covalant
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The temperature at which ferromagnetic material can no longer be magnetised by the outside forces, is termed as the
A. Critical point
B. Curie temperature
C. Inversion temperature
D. Eutectic temperature
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Non-ferrous alloys used for making cutting tools need not have high
A. Abrasion resistance
B. Toughness
C. Red hardness
D. Cutting speed
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The gases used in the treatment of asthma is a mixture of __________ and oxygen.
A. Helium
B. Argon
C. Neon
D. None of these
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Magnetic permeability of iron is increased by its
A. Decarburising
B. Alloying with cobalt
C. Purification
D. Alternate heating & cooling
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The yield point in fatigue loading compared to that in static loading is less. The ratio of ultimate tensile strength to endurance limit of a material subjected to fatigue loading is
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FeO(s) + CO(g) = Fe(s) + CO2 (g), k = 0.435 at 1173 E; At equilibrium, what will be the number of moles of CO gas required to reduce one mole of FeO at 1173 K?
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Material of construction of foundary crucible is
A. Graphite
B. Lead
C. Porcelain
D. Stainless steel
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Material of construction of foundary crucible is
A. Lead
B. Stainless steel
C. Graphite
D. Cast iron
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Fatigue limit improvement by over stressing the metal by successively increasing the load is called coaxing. In fatigue failure, the material fails
A. Below the yield point
B. Above the yield point
C. Below the elastic limit
D. At the elastic limit
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Gross national product (GNP) means the total value of __________ in a country.
A. Goods produced
B. Gold reserve
C. Earning of the citizens
D. Taxes paid
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Plastics as a material of construction suffer from the drawback of low
A. Machinability
B. Density
C. Strength
D. Plastic deformation
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Which is the only metal that exists in liquid state at room temperature?
A. Sodium
B. Mercury
C. Lithium
D. Strontium
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A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place
A. The better insulation material should be put just next to pipe (i.e., inside)
B. The better insulating material should be put outside
C. Either of the insulating material could be put on either side
D. Steam temperature is considered before deciding as to which insulating material is to be put inside (i.e., just next to the pipe)
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Presence of nickel & chromium in steel does not raise its
A. Elastic limit
B. Machining properties
C. Ductility
D. Resilience
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Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode
A. Occurs higher in the electro-chemical series of metals
B. Is exemplified by magnesium plate
C. Is much cheaper than the cathodic base material to be guarded against corrosion
D. All of the above
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In fluid flow and heat & mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular diffusivity (θ) and thermal diffusivity (α). The units of these quantities are
A. μ, α and θ all have units of m/s
B. μ, α and θ all have units of m2 /s
C. α and θ have units of m2 /s, while μ has unit of m/s
D. α and θ have units of m/s, while μ has unit of m2 /s
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Fluorine is not a constituent of
A. Freon
B. Chloroform
C. Teflon
D. Fluorocarbons
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Superheated vapour behaves like
A. Dry steam
B. Gas approximately
C. An ordinary vapor
D. None of these
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