Q.1
Ultimate strength in tension as compared to that in shear for steel is
Q.2
The predominant mode of heat transfer which takes place from boiler furnace to water walls of a boiler is
Q.3
__________ joint is usually used for joining cast iron pipes mostly used for temporary pipelines, where it may be necessary to dismantle & reassemble the pipeline very frequently.
Q.4
The main function of the deaerator used in the thermal power plant is to
Q.5
Notched bar test is used for testing the __________ of a material.
Q.6
There are one octahedral void and __________ tetrahedral void in the closest packing of atoms.
Q.7
Super conduction in metals is observed at a temperature of __________ °K.
Q.8
Rain drops falling through atmospheric air attain limited terminal velocity, because of
Q.9
In radiative heat transfer, a grey surface is the one, which has
Q.10
The ratio of thermal & electrical conductivity is same for all the metals at the same temperature ; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K)
Q.11
Eutectoid reaction for iron-carbon system occurs at a temperature of __________ °C.
Q.12
Stretcher strains found in a low carbon sheet are associated with the
Q.13
For hardening high alloy steel, it is to be heated slowly and uniformly to avoid
Q.14
Sub zero treatment of steel is done to
Q.15
Austempering of steel requires.it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to
Q.16
Air standard Otto cycle is more efficient than the diesel cycle for the same
Q.17
Which of the following metals reacts violently with water ?
Q.18
The process of removal of scale formed during hot rolling of steel is termed as
Q.19
The product of a commercial direct reduction process is
Q.20
__________ flux is used for the extraction of metal from its self fluxing ores.
Q.21
A hot short metal is
Q.22
Out of the following substances, one ton of __________ will store the maximum heat for a rise of 30°C in temperature.
Q.23
The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system
Q.24
To improve the machinability of steel by its softening, it is subjected to
Q.25
A compact estimate about the amount of materials handling between various work stations is obtained from the
Q.26
Ageing of steel refers to the
Q.27
The main reducing agent in iron blast furnace is
Q.28
Silicon crystal can be converted to p-type semi-conductor by doping with
Q.29
During sensible heating of humid air
Q.30
Metals in general have a low value of thermal
Q.31
The machanism involved in the removal of metal in drilling operation is by
Q.32
__________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.
Q.33
Aluminium oxide (an abrasive) is used for grinding
Q.34
A static fluid can not have
Q.35
Percentage of differential pressure lost in a venturimeter with a tapering of 15° may be about
Q.36
Main constituent of bone ash is
Q.37
pH value of rain water in India ranges from
Q.38
At the point of boundary layer separation in fluid flow, the
Q.39
Spheriodising of a material is a/an __________ process.
Q.40
Which of the following low melting alloy containing bismuth and lead is used for electric fuse ?
Q.41
Adhesives
Q.42
For infinite parallel planes having emis-sivities ε₁ & ε₂, the interchange factor for radiation from surface 1 to surface 2 is given by
Q.43
In case of simple harmonic motion, displacement is proportional to the
Q.44
The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400°C is
Q.45
The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours is __________ BTU/hr.
Q.46
Maximum permissible air velocity in pipelines is about __________ metre/second.
Q.47
The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K⁻¹mole⁻¹)
Q.48
Slight displacement of a floating body in liquid makes it to oscillate about its
Q.49
The most commonly used material for sewers for carrying sewage in the normal situation is
Q.50
In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________ increases.
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