Production of a hollow product by inflation of a tube or parison is called the __________ process.
Blow moulding
Calendaring
Extrusion
Injection
Correct Answer :
A. Blow moulding
Related Questions
Which of the following fastening devices has a head at one end and a nut fitted to the other?
Bolt
Stud
Top bolt
None of these
Tip of the match stick contains a mixture of
K + S
K + S + K2Cr2O7
S + K2Cr2O7 + White P
None of these
Catalyst used in the 'catalytic converter' employed in automobile exhaust line for complete combustion/oxidation of carbon monoxide, nitrogen oxides and hydrocarbons is
Alumina
Platinum
Vanadium pentoxide
Iron oxide
Inertial forces are obtained, when the elastic forces are multiplied by __________ number.
Mach
Froude
Reynolds
Euler
A jig is used while __________ a hole.
Boring
Counter boring
Drilling
Enlarging
The 'transition temperature' for ductile to brittle behaviour of steel increases with increase in the __________ content in steel.
Carbon
Manganese
Both 'a' nor 'b'
Neither 'a' nor 'b'
Fibrous fracture is normally encountered in the __________ materials.
Hard
Elastic
Ductile
Brittle
Euler number is defined as the ratio of inertia force to __________ force.
Pressure
Elastic
Gravity
Viscous
Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are __________ respectively.
70 & 30
30 & 70
50 & 50
90 & 10
The property of material, by which a given amount of energy is absorbed by it without plastic deformation, is called the
Resilience
Toughness
Ductility
Impact strength
Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of
Lumps
Pellets
Briquettes
Sinter
Shampoos are commercially not available in the form of
Powder
Gaseous mixture
Solution
Emulsion
Reduction in the grain size reduces the __________ of the material.
Fatigue resistance
Tensile strength
Creep resistance
All (A), (B) & (C)
Upto the critical radius of insulation, added insulation, will
Increase the heat loss
Decrease heat loss and will have no effect beyond that
Decrease heat flux
Reduce convection heat loss compared to conduction heat less
In a furnace with heating element temperature at 1700°C, the dominant mechanism of heat transfer will be
Conduction
Radiation
Natural convection
Forced convection
The leaching solvent used in Baeyer's process for the purification of bauxite is
Ammonium hydroxide
Sodium carbonate
Sodium hydroxide
Ammonium carbonate
Out of the following substances, one ton of __________ will store the maximum heat for a rise of 30°C in temperature.
Steel
Lignite
Water
Lime stone
The type of pump used for lifting large quantity of sewage is a __________ pump.
Gear
Centrifugal
Reciprocating
Plunger
Which of the following are made out of the carbon steel having carbon content of 0.9 to 1%?
Small punches, broaches reamers and springs
Cutlery, screws, rivets and files
Mandrels, twist drills, small lathe tools and razors
Forgings like can shaft, structural steel plate, threading dies and drawing dies
For dynamic strain measurement, the Wheatstone bridge used is of __________ type.
Voltage sensitive null
Voltage sensitive deflected
Current sensitive deflected
None of these
__________ test is the appropriate test to determine whether a material is ductile or brittle.
Impact
Cupping
Hardness
Tensile
In the X-ray radiography technique, the tube voltage for thicker plates as compared to thin plates, should be
Higher, as it gives higher wavelength
Lower, as it gives higher wavelength
Higher, as it gives shorter wavelength
Lower, as it gives shorter wavelength
Methyl orange indicator turns
Orange yellow in alkaline medium
Orange yellow in acidic medium
Colourless in acidic medium
Colourless in basic medium
Which of the following processes follows the hardening process for reducing the hardening strains & increasing the toughness of the steel part?
Anodising
Tempering
Carburising
Annealing
Which of the following has the least value of ultimate tensile strength (UTS)?
Medium carbon steel
High carbon steel
Cast iron
Wrought iron
__________ the exhaust gas is an indication of the incomplete combustion of fuel.
Low temperature of
High temperature of
High % of CO in
High % of CO2 in
The product out from a cupola is called
Wrought iron
Pig iron
Cast iron
None of these
Metallic surveying tapes are made of __________ which has a low co-efficient of expansion & enough strength.
Invar
Hastelloy
Duralumin
Monel metal
Brazing filler metal used for joining steel plates
Melts below the melting points of base metals
Melts below 300°C
Is copper phosphorous alloy
Is copper
Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ρ = specific weight of the gas)
√T
1/√P
√y
1/√ρ