Q.1
A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material?
Q.2
Steel produced from phosphatic iron is __________ in nature.
Q.3
Swaging is a/an __________ operation.
Q.4
__________ is not a case hardening process.
Q.5
The approximate height of a blast furnace having a useful volume of 2000 m³ is about __________ metres
Q.6
Materials used for making permanent magnets containing iron and nickel are made by __________ technique.
Q.7
Shaft/rotor speed is most accurately measured by a
Q.8
Which of the following phenomenon/ phenomena is/are diffusion controlled ?
Q.9
On increasing the yield strength of a steel from 450 to 650 MPa, its __________ will increase.
Q.10
Thermal efficiency of an internal combustion engine is around __________ percent.
Q.11
Pick out the wrong statement
Q.12
Transformation range for ferrous material is the temperature interval during which __________ is formed during its heating.
Q.13
Frost formation on the evaporator tubes in the domestic refrigerators
Q.14
Milk is fat dispersed in water. It is an example of
Q.15
__________ is the most suitable lubricant for drawing mild steel wires?
Q.16
Maraging steels derive their strength from the following mechanism:
Q.17
__________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength.
Q.18
Hydrogen in liquid steels is dissolved
Q.19
For the irreversible reaction, Ca+ 2C = Ca C₂ , Δ H°298 = - 60000 J . mole⁻¹ . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be
Q.20
__________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.
Q.21
Tempering of a material does not improve its
Q.22
With increase in steam pressure, its specific volume decreases
Q.23
The velocity of sound in air is independent of changes in its
Q.24
The most important material handling system in an integrated steel plant is the
Q.25
Ignition of fuel in a diesel engine is by
Q.26
Blast furnace slag is mainly molten
Q.27
Laser welding is widely employed in the __________ industries.
Q.28
Air refrigeration cycle is used in the air crafts, because of
Q.29
Which of the following contributes maximum as main source of sulphur in the blast furnace charge ?
Q.30
Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are
Q.31
Which of the following welding processes employs the highest welding temperature ?
Q.32
In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is
Q.33
Titanium alloys are welded using the Following process:
Q.34
Salvage value is the most flexible criteria for analysing a financial investment. 'Salvaging' means
Q.35
Paint spray gun works on the principle of
Q.36
Classification of metal forming processes into hot and cold working is based on the following parameters.
Q.37
Working of linear variable differential transducer (LVDT) is based on the principle of variable
Q.38
Wood is a/an __________ material.
Q.39
Lead is most readily dissolved in
Q.40
Puddling process is used for converting pig iron into
Q.41
Which of the following is a boiler accessory i.e., not a boiler mounting ?
Q.42
The behaviour of a metal specimen, which when plastically strained in tension reduces its yield stress in compression and vice versa; is termed as the
Q.43
Ester is formed, when an alcohol reacts with
Q.44
Silicon percentage in acid resistant cast iron is about
Q.45
Pick out the wrong statement.
Q.46
Holes in a plate for rivetted joints is preferably made by
Q.47
Hard magnetic materials have high
Q.48
Between 230 and 370°C, blue brittleness is caused in mild steel because of the
Q.49
Metal shots used in shot blasting are made of
Q.50
A jet engine turbine blade is normally manufactured by
0 h : 0 m : 1 s