Related Questions
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Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same weight
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4
'Cryogenics' is concerned with the generation & use of low temperature in the range of
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4
__________ is a non volatile film forming constituent of a paint.
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One ton of refrigeration is not equivalent to the heat removal rate of
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Matte smelting is used in the extraction of
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Materials having __________ lattice structure are usually the most ductile.
A. Body centred cubic (bcc)
B. Hexagonal close packed (hcp)
C. Face centred cubic (fcc)
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4
Fire refining process is employed in case of
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4
Pressure exerted by a liquid depends upon its
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4
Shrinkage allowance on pattern is provided to compensate for shrinkage when the
A. Metal changes from liquid state to solid state at freezing temperature
B. Solid phase temperature drops from freezing temperature to the room temperature
C. Liquid metal temperature drops from pouring temperature to room temperature
D. Liquid metal temperature drops from pouring temperature to freezing temperature
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4
Most important property of steels for use in automobile bodies is the
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Boiling point of water gets lowered at high altitudes (e.g., hills), because
B. Atmospheric pressure is low
C. Atmospheric pressure is high
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4
Corona discharge is related to the operation of a/an
B. Electrostatic precipitator
D. Magneto hydrodynamic generator (MHD)
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4
Air-petrol ratio for maximum power generation in spark ignition engine is about
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4
__________ is not a case hardening process.
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The activity co-efficient of the solute in a dilute solution
A. Decreases with the increase of concentration of the solute
B. Increases with the increase of concentration of the solute
D. Is unity at infinite dilution
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4
Which of the following is a boiler accessory
i.e., not a boiler mounting?
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__________ can replace tungsten in high speed steel.
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In fluid flow, and heat and 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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4
The refrigerant freon-12 is chemically
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Boiler tube size is specified by its thickness and __________ diameter.
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Steel & cast iron pipes are produced by __________ casting.
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4
At the point of boundary layer separation in fluid flow, the
A. Shear stress is maximum
B. Velocity gradient is flat
C. Density variation is maximum
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Atomic __________ is a whole number for an element.
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Which of the following is not the commercial name of poly-methyl-methacrylate (PMMA)?
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Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.
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Which of the following materials does not form adherent oxide film on surface?
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Cementite is in the lamellar form in the __________ phase of steel.
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4
A spring material should have low
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4
Air-petrol ratio in an automotive petrol engine is around
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For infinite parallel planes having emissivities ε1 & ε2, the interchange factor for radiation from surface 1 to surface 2 is given by