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Chemical Engineering Basics
Quiz 15
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Q.1
Ultimate strength in tension as compared to that in shear for steel is
Half
One third
One and half times
One fourth
Q.2
The predominant mode of heat transfer which takes place from boiler furnace to water walls of a boiler is
Conduction
Convection
Both A & B
Radiation
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.
Collar
Flanged
Bell and Spigot
Expansion
Q.4
The main function of the deaerator used in the thermal power plant is to
Throttle down the steam pressure
Enhance feed water temperature
Remove dissolved gases from feed-water
Remove non-condensable gases from condenser
Q.5
Notched bar test is used for testing the __________ of a material.
Impact strength
Endurance limit
Machinability
Corrosion resistance
Q.6
There are one octahedral void and __________ tetrahedral void in the closest packing of atoms.
One
Two
Three
None of these
Q.7
Super conduction in metals is observed at a temperature of __________ °K.
<100
>100
About 273
About 373
Q.8
Rain drops falling through atmospheric air attain limited terminal velocity, because of
Upward thrust due to air
Viscous force exerted by air
Surface tension effects of water
Force of gravity
Q.9
In radiative heat transfer, a grey surface is the one, which has
Emissivity independent of wavelength
Grey appearance to the eye
Zero reflectivity
Equal brightness in all directions
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)
T
1
/
T
T²
1
/
T²
Q.11
Eutectoid reaction for iron-carbon system occurs at a temperature of __________ °C.
597
959
1147
1493
Q.12
Stretcher strains found in a low carbon sheet are associated with the
Texture
Dislocation density
Yield point phenomenon
Thickness of the sheet
Q.13
For hardening high alloy steel, it is to be heated slowly and uniformly to avoid
Local hardening
Scale formation
Segregation
Warpage
Q.14
Sub zero treatment of steel is done to
Suppress martensite transformation
Enhance its working performance in sub zero atmosphere
Reduce the retained austenite in hardened steel
Induce temper brittleness after its hardening
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
Sorbite
Bainite
Martensite
Troostite
Q.16
Air standard Otto cycle is more efficient than the diesel cycle for the same
Heat addition & compression ratio
Heat addition & pressure
Compression ratio & pressure
Cylinder dimension & rpm
Q.17
Which of the following metals reacts violently with water ?
Mercury
Sodium
Calcium
Magnesium
Q.18
The process of removal of scale formed during hot rolling of steel is termed as
Descaling
Shot blasting
Pickling
Skimming
Q.19
The product of a commercial direct reduction process is
Liquid iron
Solid iron
Sponge iron
Iron saturated with carbon
Q.20
__________ flux is used for the extraction of metal from its self fluxing ores.
No
Acid
Basic
Neutral
Q.21
A hot short metal is
Hard when hot
Brittle when cold
Brittle when hot
Brittle under all conditions
Q.22
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
Q.23
The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system
Is as light as possible
Has very high C.O.P
Employs minimum quantity of refrigerant
Consumer minimum horse power
Q.24
To improve the machinability of steel by its softening, it is subjected to
Cold working
Annealing
Shot blasting
Heating
Q.25
A compact estimate about the amount of materials handling between various work stations is obtained from the
Gantt chart
Bin chart
String diagram
Travel chart
Q.26
Ageing of steel refers to the
Degradation of steel by corrosion
Failure of steel structure by overstress-ing
Return of sharp yield point in temper rolled low carbon sheet after a period of time
Decarburisation of steel by overheating
Q.27
The main reducing agent in iron blast furnace is
Carbon dioxide
Carbon monoxide
Oxygen
Air
Q.28
Silicon crystal can be converted to p-type semi-conductor by doping with
Phosphorous
Nitrogen
Carbon
Boron
Q.29
During sensible heating of humid air
Relative humidity increases
Dew point remains constant
Dry bulb & wet bulb temperature increases
Both 'b' & 'c'
Q.30
Metals in general have a low value of thermal
Conductivity
Diffusivity
Inertia
All of the above
Q.31
The machanism involved in the removal of metal in drilling operation is by
Compression
Extrusion
Shearing
Both A & C
Q.32
__________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.
Packed
Bubble
Spray
Tray
Q.33
Aluminium oxide (an abrasive) is used for grinding
Ceramics
High speed steel
Cemented carbide
None of these
Q.34
A static fluid can not have
Zero shear stress
Positive normal stress
Non-zero shear stress
None of these
Q.35
Percentage of differential pressure lost in a venturimeter with a tapering of 15° may be about
1
10
25
50
Q.36
Main constituent of bone ash is
Ammonium phosphate
Calcium phosphate
Animal charcoal
Ammonium sulphate
Q.37
pH value of rain water in India ranges from
5.5 to 7.5
8 to 9.5
3.5 to 5
9.5 to 10.5
Q.38
At the point of boundary layer separation in fluid flow, the
Shear stress is maximum
Velocity gradient is flat
Density variation is maximum
Shear stress is zero
Q.39
Spheriodising of a material is a/an __________ process.
Normalising
Annealing
Tempering
Hardening
Q.40
Which of the following low melting alloy containing bismuth and lead is used for electric fuse ?
Wood's metal
Babbit metal
Monel metal
Duralumin
Q.41
Adhesives
Can't be used in the form of pressure sensitive tapes
Can't join two dissimilar metals
Cure instantaneously after application on a surface
None of these
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
(ε₁ + ε₂)/ε₁.ε₂
Ε₁.ε₂/(ε₁ + ε₂ - ε₁.ε₂)
Ε₁.ε₂
Ε₁ + ε₂
Q.43
In case of simple harmonic motion, displacement is proportional to the
Velocity
Acceleration
Both A & B
Neither A nor B
Q.44
The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400°C is
Magnesite
Chrome
Silica
Fireclay
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.
100
200
1000
2000
Q.46
Maximum permissible air velocity in pipelines is about __________ metre/second.
5
10
20
40
Q.47
The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : C
p
of copper is 23 J K⁻¹mole⁻¹)
2300 J
4600 J
230 J
2.3 x 106 J
Q.48
Slight displacement of a floating body in liquid makes it to oscillate about its
Centre of pressure
Centre of gravity
Metacentre
Centre of pressure
Q.49
The most commonly used material for sewers for carrying sewage in the normal situation is
Asbestos cement
Stainiess steel
Stoneware
Cast iron
Q.50
In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________ increases.
Percentage elongation
Brinell hardness
Tensile strength
All of the above
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