Related Questions
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The refractory lining of the bottom in a basic electric arc furnace is made of
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Limestone addition in the blast furnace is done to flux __________ present in the raw materials.
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Cast iron contains __________ percent carbon.
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4
Resistance of an electrical conductor is proportional to its (where, l = length and A = cross-sectional area of the conductor)
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4
Which of the following is an acidic constituent of B.F. slag?
A.
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4
The thermodynamic law, = constant, is not followed by the
A. Free expansion of an ideal gas
B. Adiabatic expansion of steam in turbine
C. Adiabatic compression of air
D. Ideal compression of air
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4
Highest cutting speed is achieved by the __________ tool material.
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4
Heat transfer by __________ is almost absent in case of fluidised bed drying operation.
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4
The activity of pure hydrogen gas at 1000°C and 5 atm pressure
B. Is always greater than 1
D. Depends on the choice of the standard state
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Evaporative cooling process employs a combination of cooling and humidification in which the
A. Sensible heat is added
B. Sensible heat is removed and the latent heat is added
C. Latent heat is removed
D. Sensible heat is added and latent heat is removed
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4
Enzymes belong to the category of
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Force between the molecules of the same substance is called __________ force.
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__________ are normally subjected to sub-zero treatment.
B. Gauges or precision parts
D. Non machinable materials
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Cold working of a material results in increase in hardness, which is termed as the __________ hardening.
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M10 index of coke indicates its
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4
Transformer cores are normally made from
C. Grain oriented Fe-Si alloy
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Addition of __________ to steel does not impart hardness.
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Wohler test is a destructive test to find out the __________ strength of a prepared metal specimen.
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4
Tesla metre per ampere (T. m/A) is the unit for the measurement of
A. Magnetic susceptibility
C. Permeability of free space
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Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of
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4
The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation as 43723 J/gm.mole, its fugacity at 300 K would be
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4
The same volume of all gases is representative of their
C. Gas characteristic constants
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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
C. Below the elastic limit
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4
Eutectoid composition of carbon steel at room temperature is
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Pick out the wrong statement.
A. A ferromagnetic material becomes paramagnetic above the 'Curie temperature'
B. Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials
C. Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces
D. Tungsten steel and alnico are not hard magnetic materials
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4
The normal stress is the same in all directions at a point in a fluid, only when the fluid
A. Is at rest & has zero viscosity
C. Fluid layer has no motion relative to an adjacent layer of fluid
D. is incompressible & frictionless
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4
Which of the following hardness tests does not measure the indentation hardness of metals and alloys?
B. Shore scleroscope test
D. Rockwell hardness test
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__________ is not used as the control rod material in a nuclear reactor.
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Density in the solid state is slightly less than that in its liquid state, in case of
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Temperature profile along the length of a gasgas counter flow heat exchanger is correctly represented by