Related Questions
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4
Name the safety device used to protect the boiler, when the water level falls below a minimum level.
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4
With increase in steam pressure, its specific volume decreases
A. Rapidly first and then slowly
C. Slowly first and then rapidly
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4
Pick out the wrong statement
A. Processing of thermosetting plastics is ideally done by injection moulding
B. Processing of thermoplastics is ideally done by compression moulding
C. Mass production of seamless pipes are done by electrical resistance welding (ERW)
D. Stretch forming is a process of cold drawing
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4
Laser is a device to produce
D. A beam of coherent light
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Cold working of a material results in increase in hardness, which is termed as the __________ hardening.
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Brittleness induced due to the presence of sulphur in steel can be reduced by adding
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Ferromagnetic materials owe their properties to __________ inner sub-shells.
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Cementite is in the lamellar form in the __________ phase of steel.
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4
Use of flux during soldering is done to
A. Increase fluidity of solder by lowering its melting temperature
B. Prevent oxide formation
C. Wash away surplus solder
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4
Dryness fraction of dry steam is
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Glycerine is used as a coolant in cooling of some engines instead of water, because
A. Its higher boiling point (290°C) increases its heat carrying capacity
B. Comparatively less weight of coolant is required
C. Smaller radiator can be used
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4
Pearlite comprises of
A. 87% cementite & 13% Fe
B. 87% ferrite & 13% cementite
C. 93.33% ferrite & 6.67% C
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4
Which of the following if present in iron ore, enhances its value?
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Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank)
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Tumbling is the process of improving the __________ of the materials/parts.
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Quartz is a __________ material.
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Wave length of X-rays is about 1 angstrom; however it cannot pass through a sheet of
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In troposphere (the weather domain), the temperature 't' at height 'h' above the sea level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)
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A steam carrying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will
D. May increase or decrease; depends on the thickness of each layer
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4
The product (s) of roasting of a sulphide ore is (are)
D. Dependent on temperature and partial pressure of oxygen & sulphur dioxide
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The taper provided on pattern for its easy & clean withdrawal from the mould is termed as the __________ allowance.
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Surface tension of a liquid
A. Is due to intermolecular forces of cohesion
B. Decreases with rise in temperature
C. Is responsible for the spherical shape of an isolated liquid drop
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Earing is a defect found in steels after the following metal working operation.
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The thickness of oxide film is y at time t. If are the temperature dependent constants, the parabolic law of oxidation is given by
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Out of the following, the joint produced by __________ has the lowest strength.
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Auto collimator is used to check
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Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by
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For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3) while the C.V. is same on weight basis (i.e., kcal/kg)?
C. Sewage gas and gobar gas
D. B.F gas and coke oven gas
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Inertial forces are obtained, when the elastic forces are multiplied by __________ number.
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Working of linear variable differential transducer (LVDT) is based on the principle of variable