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A thin, flat & square plate measuring 2 m × 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2. The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is __________ W/m2 °C.
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4
On decreasing the grain size of a polycrystalline material, the property most likely to deteriorate is
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4
For infinite parallel planes having emissivities ε1 & ε2, the interchange factor for radiation from surface 1 to surface 2 is given by
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4
Uniform ramming of sand in green sand moulding process leads to
A. Reduced chance of gas porosity
B. Greater dimensional stability of the casting
C. Uniform flow of molten metal into the mould cavity
D. Less sand expansion type of casting defect
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4
__________ furnace is generally used in the non-ferrous foundries.
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Which of the following heat treatment processes is usually applied to castings?
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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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The highest stress that a material can withstand for a specified length of time without excessive deformation is called the __________ strength.
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Which one is neutral in character?
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Joule-Thomson co-efficient is the ratio of
A. Pressure change to temperature change occuring during adiabatic compression of a gas
B. Pressure change to temperature change occuring during adiabatic throttling of a gas
C. Temperature change to pressure change occuring during adiabatic compression of a gas
D. Temperature change to pressure change occuring during adiabatic throttling of a gas
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4
What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.
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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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All of the following alloying elements of steel increases hardness but sacrifice ductility, except
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4
A compact estimate about the amount of materials handling between various work stations is obtained from the
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Tumbling is the process of improving the __________ of the materials/parts.
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In electrical resistance welding, distortion results from the use of improper
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Gantt charts are used for streamlining the
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Inertial forces are obtained, when the elastic forces are multiplied by __________ number.
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The pressure outside a bubble/droplet of liquid is __________ the internal pressure.
D. Unpredictable; depends on the bubble size
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Good design of the casing of a centrifugal pump aims at minimising the
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Unit of viscosity in CGS system is
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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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4
Lap joints are preferred over butt joints in soldering/brazing, because these joints are
A. Weaker in tension but stronger in shear
B. Weaker in shear but stronger in tension
C. Stronger in both shear and tension
D. The lap joints are easily made
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Which of the following low melting alloy containing bismuth and lead is used for electric fuse?
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Often earing defects are found during deep drawing operation, because the
A. Surface finish of the sheet is poor
B. Sheet material has been given substantial spring back
C. Starting sheet has planer anisotropy due to its texture
D. Starting sheet has normal anisotropy due to its texture
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Which of the following terminology is used for the temperature at which new grains are formed in a metal?
B. Lower critical temperature
C. Recrystallisation temperature
D. Upper critical temperature
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Non-ferrous alloys used for making cutting tools need not have high
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Neutrons are present in all atoms except that of
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The cathode in an electrochemical cell always carries
D. Positive or negative charge depending upon the nature of the cell
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If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity
C. Decreases by a factor of 3
D. Decreases by a factor of 1/3