Cast iron compared to steel is better in
A. Ductility
B. Strength
C. Malleability
D. Fluidity & castability
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With increase in temperature, the electrical conductivity of semiconductors
A. Increases
B. Decreases
C. Remain constant
D. Either A or B, depends on the type of semi-conductor
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Constituents of stellite are
A. Zinc, copper & nickel
B. Cobalt, chromium & tungsten
C. Zinc, aluminium & nickel
D. Nickel, cobalt & vanadium
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__________ is not used as a material of construction in thermocouples.
A. Alumel
B. Rhodium
C. Constantan
D. Duralumin
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Ganister contains maximum percentage of
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In BOF, desiliconisation is a first order reaction. So the silicon content of the metal decreases
A. Linearly with time
B. Exponentially with time
C. Logarithmically with time
D. In proportion to the square root of time
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Corrosion is
A. A physical phenomenon
B. A chemical phenomenon
C. Same as erosion
D. An uncontrollable phenomenon
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Aromatics are desired constituents of
A. Lubricating oil
B. Diesel
C. Kerosene
D. Petrol
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The product out from a cupola is called
A. Wrought iron
B. Pig iron
C. Cast iron
D. None of these
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The product out from a cupola is called
A. Wrought iron
B. Pig iron
C. Cast iron
D. None of these
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Rate of chemical reaction is not much affected, if the reactants are in __________ form.
A. Solids
B. Liquids
C. Either A or B
D. Gaseous
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Resistance of an electrical conductor is proportional to its (where, L = length and A = cross-sectional area of the conductor)
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Out of the following the refractive index is the highest for
A. Glass
B. Diamond
C. Brine
D. Kerosene
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Compressed dry air is used as the cutting fluid, while machining
A. Steel
B. Cast iron
C. Aluminium
D. None of these
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The taper provided on pattern for its easy & clean withdrawal from the mould is termed as the __________ allowance.
A. Casting
B. Pattern
C. Draft
D. Distoration
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Cold working of a material results in increase in hardness, which is termed as the __________ hardening.
A. Cold
B. Work
C. Age
D. Induction
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The increase in hardness of metal due to its cold working is termed as the __________ hardening.
A. Work
B. Age
C. Induction
D. Flame
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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.
A. Bomb
B. Throttling
C. Junker's
D. Boy's
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Pressure exerted by a liquid depends upon its
A. Surface tension
B. Density
C. Viscosity
D. Buoyancy
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Scab is a defect developed during __________ of metals.
A. Forging
B. Sand casting
C. Machining
D. Welding
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