Q.1
Cold working of a material results in increase in hardness, which is termed as the __________ hardening.
Q.2
The increase in hardness of metal due to its cold working is termed as the __________ hardening.
Q.3
Rate of chemical reaction is not much affected, if the reactants are in __________ form.
Q.4
In BOF, desiliconisation is a first order reaction. So the silicon content of the metal decreases
Q.5
Cast iron compared to steel is better in
Q.6
Tungsten in high speed steel is responsible for its
Q.7
Melting point & boiling points of liquid oxygen are respectively - 218.8°C & - 183°C, while the same for liquid nitrogen is - 210°C & - 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8
Q.8
Which of the following is the most effective inhibitor of grain growth, when added in small quantity in steel ?
Q.9
Fibrous fracture is normally encountered in the __________ materials.
Q.10
Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the mixture. Dryness factor of steam is measured by a __________ calorimeter.
Q.11
Pressure exerted by a liquid depends upon its
Q.12
Resistance of an electrical conductor is proportional to its (where, l = length and A = cross-sectional area of the conductor)
Q.13
Out of the following the refractive index is the highest for
Q.14
Corrosion is
Q.15
Aromatics are desired constituents of
Q.16
With increase in temperature, the electrical conductivity of semiconductors
Q.17
__________ is not used as a material of construction in thermocouples.
Q.18
Coarse grained steels have
Q.19
Colloids can be purified by
Q.20
Scab is a defect developed during __________ of metals.
Q.21
Compressed dry air is used as the cutting fluid, while machining
Q.22
The taper provided on pattern for its easy & clean withdrawal from the mould is termed as the __________ allowance.
Q.23
Electrostatic separation of minerals from each other is based on their differences in the following property.
Q.24
Which of the following manufacturing processes produces the strongest components ?
Q.25
The product out from a cupola is called
Q.26
The product out from a cupola is called
Q.27
Force between the molecules of the same substance is called __________ force.
Q.28
The trace metal present in insulin is
Q.29
Ganister contains maximum percentage of
Q.30
An oxidation process is accompanied with decrease in the
Q.31
A reduction process is accompanied with increase in the
Q.32
Probability of cavitation occuring becomes very high, when the local __________ resulting in water bubbles formation, which on rupture cause cavitation
Q.33
Tip of the match stick contains a mixture of
Q.34
Out of the following, the joint produced by __________ has the lowest strength.
Q.35
Corrosion rate can not be lowered by reducing the __________ of the corroding medium.
Q.36
Powder metallurgy processing can be used for making
Q.37
The leg of a barometric leg pump is longer than the Toricellian leg, which is about __________ metres.
Q.38
Thermal shock produced by cooling is more dengerous/deleterious than that produced by heating a surface, because of the reason that
Q.39
Bad odour in sanitary latrines is reduced by periodically sprinkling
Q.40
Ceramic materials are
Q.41
Ceramic compounds as compared to metallic compounds
Q.42
A friction lighter is normally used for lighting gas welding torch, because of the reason that
Q.43
Gratings is associated with the measurement of
Q.44
Nickel is a __________ material.
Q.45
1% concentration of water vapor in air is equivalent to __________ ppm (parts per million).
Q.46
Measurement of the area of the indented surface is not involved in the __________ hardhes testing method.
Q.47
Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by __________ have residual stresses.
Q.48
Water hammer is caused in steam carrying pipelines, because of
Q.49
__________ number determines whether the fluid flow in an open channel is supercritical, critical or sub-critical.
Q.50
Production of a hollow product by inflation of a tube or parison is called the __________ process.
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