Q.1
Number of electrons in the outermost shell of a semi-conductor material is
Q.2
Material of construction of surveying metallic tapes is __________ which has low coefficient of expansion & enough strength.
Q.3
Softening of hardned steel is done by its
Q.4
__________ number is sometimes used in place of Grashoff number in free convection heat transfer.
Q.5
Boiler rating is normally done in terms of
Q.6
Fine grained steels have
Q.7
Floating control action
Q.8
'Ice point' is designated on Farenhite temperature scale by
Q.9
Safety matches is produced using
Q.10
Encyclopaedia of Chemical Technology has been
Q.11
__________ is the trade name assigned to a non-ferrous cast alloy composed of cobalt, chromium & tungsten.
Q.12
The atmospheric temperature during melting of ice/snow (in the atmosphere)
Q.13
Dialysis is the process of separating substances in the
Q.14
Electrochemical corrosion occurs
Q.15
The Al2 O₃ content of cryolite in Hall-Heroult's cell is maintained between __________ percent.
Q.16
Pick out the wrong statement.
Q.17
Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of __________ will facilitate the most accurate measurement of the temperature.
Q.18
Styrofoam is the commercial name of
Q.19
Which of the following is an inedible oil ?
Q.20
Young's modulus of elasticity of a material is the slope of the initial linear portion of the stress-strain curve. It decreases ap-preciablyby
Q.21
Which of the following relatively employs the highest heat transfer surface area in a high pressure boiler ?
Q.22
A thin, flat & square plate measuring 2 m x 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/m ². The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is __________ W/m² °C.
Q.23
Three elastic constants for a completely anisotropic elastic material which follows the Hooke's law are young's modulus, elastic limit stress and yield stress. Which of the following properties is most sensitive to increase in strain rate ?
Q.24
Strain hardening effect in a metal subjected to cold working is due to the __________ mechanism.
Q.25
The hydraulic radius of a circular pipe of diameter 'd' flowing full is
Q.26
Metallic surveying tapes are made of __________ which has a low co-efficient of expansion & enough strength.
Q.27
The type of pump used for lifting large quantity of sewage is a __________ pump.
Q.28
'End cooler' or 'after cooler' is employed in air compressor mainly to
Q.29
Cathodic protection is widely used in controlling corrosion in
Q.30
Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of __________ will facilitate the most accurate measurement of the temperature.
Q.31
A high pressure boiler generates steam at a pressure greater than __________ kg/cm² .
Q.32
Which of the following contains the least percentage of carbon ?
Q.33
Which of the following commonly used condenser tube materials has the lowest thermal conductivity?
Q.34
The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the 'Curie temperature'. Its value for cobalt is __________ °C.
Q.35
Baffles provided on the shell side of a shell and tube heat exchanger are meant for
Q.36
Out of the following __________ iron has the best capability to bear sudden & excessive shocks.
Q.37
The dew point of moist air becomes __________ with decrease in its relative humidity.
Q.38
Strain hardening effect in metals subjected to cold working is due to the __________ mechanism.
Q.39
Which of the following processes follows the hardening process for reducing the hardening strains & increasing the toughness of the steel part?
Q.40
The hardness of the lathe bed material is measured by the
Q.41
For a first order chemical reaction, the concentration of the reactant decreases __________ with time.
Q.42
The main constituent of bones is
Q.43
The tensile load-elongation curve of a metal does not describe
Q.44
Iron content in Indian iron ore is about __________ percent.
Q.45
Suitability of steel for its use in cable is judged by its strength in
Q.46
Which of the following is the largest quantum of pressure?
Q.47
Titanium is produced by __________ of Ti Cl₄.
Q.48
Globular form of cementite is formed during the __________ process.
Q.49
The order of a chemical reaction
Q.50
Fibre reinforced plastic (FRP) are
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