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Quiz 2
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Q.1
L.D. converters are generally lined with
Magnesite
Fireclay
Chrome magnesite
Silica
Q.2
The ability of a substance to assume two or more crystalline structure is called
Isomorphism
Polymorphism
Amorphism
Isomerism
Q.3
Which of the following forces does not act on a fluid at rest?
Viscous force
Gravity force
Hydrostatic force
Surface tension force
Q.4
A simple closed grinding circuit may consist of
A ball mill and a classifier
A rod mill and a hydrocyclone
A jaw crusher and a hydrocyclone
A ball mill and a froth floatation cell
Q.5
Which of the following is categorised as the plastic welding?
Gas welding
Electric arc welding
Forge welding
None of these
Q.6
Yield strength of a material is determined by the __________ test.
Creep
Tension
Compression
Endurance
Q.7
Steel & cast iron pipes are produced by __________ casting.
Slush
Die
Investment
True centrifugal
Q.8
The noble metals
Are exemplified by Na, K and Li
Do not resist corrosion very strongly
Are the lowermost in the electro-chemical series of metals
None of these
Q.9
Filler material used in welding should have __________ as compared to the parent metal to be welded.
Lower melting temperature
Same melting temperature
Same composition
Both B & C
Q.10
Euler number is defined as the ratio of inertia force to __________ force.
Pressure
Elastic
Gravity
Viscous
Q.11
Existence of velocity potential implies that the fluid is
Irrotational
Ideal
Compressible
In continuum
Q.12
Ferrites are __________ magnetic.
Anti
Para
Ferri
Ferro
Q.13
The most prominent single cause of corrosion in boilertubes, drums, economisers and steam superheaters in a thermal power plant boiler is the
Water alkalinity & leakage
Hydrazine addition during feed water treatment
Release of non-condensable gas from water in the boiler
Scale formation
Q.14
Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog?
Nitrogen oxides
Hydrocarbons
Both A & B
Carbon monoxide
Q.15
Work done by a/an __________ process is determined by ∫p.dV.
Adiabatic
Quasi-static
Isothermal
Isentropic
Q.16
The cathode in an electrochemical cell always carries
Negative charge
Positive charge
Zero charge
Positive or negative charge depending upon the nature of the cell
Q.17
Rockwell number represents the
Hardness of a substance
Colour of a pigment
Density of a polymer
Active ingredients in a fertiliser
Q.18
Electric arc furnace is employed mainly for the production of __________ steel.
High carbon
Alloy
Mild
Plain carbon
Q.19
Powder metallurgy technique is used in the production of __________ tools.
Tungsten carbide
High carbon steel
High speed steel
Drilling
Q.20
Which of the following is normally not found in both the S.I. (petrol) & C.I. (diesel) engines?
Air filter
Fuel injector
Exhaust silencer
Battery
Q.21
The leaching solvent used in Baeyer's process for the purification of bauxite is
Ammonium hydroxide
Sodium carbonate
Sodium hydroxide
Ammonium carbonate
Q.22
The unit of g
c
is
lb
m
/lb
f
. ft/seC₂
lb
f
/lb
m
. ft/seC₂
lb
m
/lb
f
. seC₂/ft
lb
f
/lb
m
. seC₂/ft
Q.23
A thermally thin body is the one for which
Biot number is less than 0.1
Gallileo number is less than 0.1
Fourier number is less than 0.1
Fourier number is greater than 0.1
Q.24
The property of material, by which a given amount of energy is absorbed by it without plastic deformation, is called the
Resilience
Toughness
Ductility
Impact strength
Q.25
Pick out the wrong statement.
Both annealing and normalising release the internal stresses of the material besides improving the mechanical properties
Low carbon steel does not respond to the heat treatment for hardening of the material, hence it is subjected to case hardening or surface hardening processes like cyniding, carburising, nitriding etc.
Induction hardening and flame hardening techniques are also used for surface hardening
Martempering of a material is a hardening process
Q.26
Preheating before welding is done to
Make the plate softer
Burn oil & grease sticking to plate surfaces
Avoid plate distortion
Prevent cold cracks
Q.27
Which of the following is a weak acid?
HF
HCl
HI
HBr
Q.28
The 'laughing gas' is
Nitrous oxide
Nitric oxide
Nitrogen trioxide
Nitrogen pentoxide
Q.29
Pick out the wrong statement.
Complete unity of command exists in a line organisation
Line organisation is net suitable for expansion and growth of an industry
In line and staff organisation, "line" executes and "staff directs
None of these
Q.30
Boiling temperature of carbon dioxide at atmospheric pressure is __________ °C.
-30.5
-78.5
-183.5
-10.5
Q.31
Silicon percentage in the silicon steel used for electrical appliances/equipments is
0.3-0.4
12-14
3-4
20-25
Q.32
Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron.
Manganese
Phosphorous
Magnesium
Chromium
Q.33
The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is
More
Equal
Less
Double
Q.34
Wavelength of radiation emitted by a body depends on the __________ of its surface.
Temperature
Area
Nature
All of the above
Q.35
Babbit lining is used on brass/bronze bearings to increase the
Antifriction properties
Compressive strength
Bearing resistance
Wear resistance
Q.36
Out of the following, __________ pipe is the least corrosion resistant.
Mild steel
Copper
Wrought iron
Stainless steel
Q.37
Out of the following, the most melleable material is
Copper
Aluminium
Wrought iron
Lead
Q.38
Silicon percentage in the silicon steel used for electrical appliances/equipments is
0.3-0.4
12-14
3-4
20-25
Q.39
Endurance is a measure of fatigue limit of a metal. Fatigue crack in nitrided machine parts originates
At the surface
Within the core
Just below the surface
Anywhere on the surface
Q.40
The type of water filter normally employed/ preferred for treating small quantities of water in railway stations and individual industries is the __________ filter.
Rapid sand
Pressure
Gravity
Slow sand
Q.41
Large diameter shafts are manufactured by
Hot rolling
Cold drawing
Casting and turning to size
Forging and turning to size
Q.42
Fatigue strength of a material can not be increased by
Cold working
Hot working
Shot peening
Any of these
Q.43
Stainless steel is welded using
Oxy-acetylene flame
Oxy-hydrogen flame
Arc welding
Inert gas arc welding
Q.44
Pick out the wrong statement about the machinability of metals. Machinability of a metal
Decreases with increase in strain hardening tendencies
Decreases with increase in hardness, in general
Depends on the composition, microstructure and physical & mechanical properties
Decreases with increases in tensile strength & decrease in grain size
Q.45
Cementite is in the lamellar form in the __________ phase of steel.
Martensitic
Bainitic
Pearlitic
Ferritic
Q.46
Otto cycle used in spark ignition petrol engines is also known as the constant __________ cycle.
Volume
Pressure
Heat
None of these
Q.47
The mechanism which changes the value of manipulated variable in response to the output signal from the control unit is called the
Final control element
On-off control
Floating control action
None of these
Q.48
__________ are not emitted by radioactive substances.
Α-rays
Β-rays
Protons
Positrons
Q.49
Addition of __________ to steel does not impart hardness.
Nickel
Copper
Chromium
Silicon
Q.50
The ability of tool steel to resist softening at high temperatures is termed as __________ hardness.
Red
Extended
Super
Extreme
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