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Quiz 16
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Q.1
Production of one ton of steel plate in a modern integrated steel plant in India consumes about __________ kWh of electricity.
50
250
450
850
Q.2
The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air.
Ambient
Dry bulb
Dew point
Wet bulb
Q.3
The path and movements followed by men, materials & equipments in executing the activities is indicated by the
Travel charts
Man-machine charts
String diagram
Flow diagram
Q.4
The power of a low capacity prime mover is most suitably measured by a __________ type dynamometer.
Driving
Transmission
Absorption
None of these
Q.5
Which of the following is not a charge material for cupola ?
Limestone
Iron scrap
Iron ore
Pig iron
Q.6
The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for __________ at room temperature.
Air
Water
Mercury
Alcohol
Q.7
The term 'Value' in value engineering technique refers to the __________ cost of the product.
Function (utility)
Selling
Production
Total
Q.8
The stress at which extension of the material takes place more rapidly as compared to the increase in load is termed as the __________ point of the material.
Elastic
Ultimate
Yielding
Breaking
Q.9
The pressure outside a bubble/droplet of liquid is __________ the internal pressure.
Greater than
Less than
Equal to
Unpredictable ; depends on the bubble size
Q.10
While the recrystallisation temperature for pure metals is 0.3 T
m
, the same for alloys is equal to __________ x T
m
(where, T
m
Melting temperature).
0.25
0.45
0.70
0.95
Q.11
What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m². °K ? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.
2
5
10
20
Q.12
Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.
Wet bulb
Dry bulb
Saturation
Dew point
Q.13
The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air.
Ambient
Dry bulb
Dew point
Wet bulb
Q.14
To counteract the bad effects of strain hardening on a cold formed part, it must be
Tempered
Normalised
Annealed
Hardened
Q.15
A good abrasive
Should be friable
Should have low refractoriness
Is made up of large size of crystals
Should be soft
Q.16
On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the __________ of the input signal.
Frequency
Amplitude
Damping
None of these
Q.17
__________ can not be forged.
High speed/carbon steel
Cast iron
Wrought iron
Mild steel
Q.18
Production of one ton of paper in Indian paper industry consumes about __________ kWh of electricity.
300
800
1400
2000
Q.19
A fluid is termed as the Newtonion fluid, when the shear stress is __________ the velocity gradient.
Independent of
Inversely proportional to
Directly proportional to
None of these
Q.20
On being hit with a hammer, __________ will readily fracture.
Brass
Mild steel
Cast iron
Lead
Q.21
Tumbling is the process of improving the __________ of the materials/parts.
Surface finish
Fatigue limit
Creep limit
Surface cleanlineses
Q.22
Natural water contains approximately __________ percent of heavy water.
0.015
0.71
1.2
3.5
Q.23
The following is a typical anionic collector used in flotation.
Ethyl dixanthogen
Trimethyl cetyl ammonium bromide
Potassium ethyl xanthate
LAuryl amine hydrochloride
Q.24
With increase in compression ratio, the volumetric efficiency of air compressor
Increases
Decreases
Remains same
May increase or decrease (depends on the suction pressure)
Q.25
M10 index of coke indicates its
Compressive strength
Hardness
Abrasion resistance
Impact strength
Q.26
Heat flow across a hollow sphere of inner radius 'r₁' and outer radius 'r₂' is directly proportional to
(r₂ - r₁)/(r₁ - r₂)
(r₂ . r₁)/(r₂ - r₁)
(r₁ + r₂)/(r₁ . r₂)
(r₁ . r₂)/(r₁ + r₂)
Q.27
A freely floating object is stable, if its centre of buoyancy
Coincides with its centre of gravity
Lies below its centre of gravity
Lies below its metacentre
None of these
Q.28
__________ welding will be the most suitable for butt welding two 20 cms thick boiler drum mild steel plates.
Electrical resistance
Electroslag
Plasma torch
Submerged arc
Q.29
Lead is poured into the joint between two- __________ pipes.
Mild steel
Concrete
Cast iron
Asbestos cement
Q.30
The hardenability of steel decreases with
Decrease in dislocation density
Increase in solutionising temperature
Increase in strength
Decrease in grain size
Q.31
Vibration upto 100 kilo hertz can be most accurately measured by a __________ type accelerometer.
Preloaded spring
Piezoelectric
Bonded strain gauge
None of these
Q.32
When metals are heated to high temperature, their __________ increases in general.
Atomic vibration
Creep strength
Yield stress & ultimate tensile strength
Toughness & stiffness
Q.33
According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear stress is equal to __________ times the yield stress.
0.5
2
√2
√3/2
Q.34
Isotropic materials have the same __________ in all the directions.
Thermal properties
Elastic properties
Stresses
All of the above
Q.35
The thickness of oxide film is y at time t. If K₁, K₂ and K₃ are the temperature dependent constants, the parabolic law of oxidation is given by
y² = 2k₁t + k₂
y = k₁ ln (k₂t + k₃)
y = k₁ t + k₂
y = k₁t³ + k₂
Q.36
What is the range of tempering temperature (°C) for most of the materials ?
75-100
200-300
350-450
500-600
Q.37
An atom bomb works on the principle of
Nuclear fission
Nuclear fusion
Both the nuclear fission & fusion
Ionisation
Q.38
Damage to metal surface by mechanical action is called
Pitting
Corrosion
Erosion
None of these
Q.39
Which of the following phenomenon will exhibit the minimum heat transfer?
Boiling
Forced convection in air
Free convection in air
Conduction in air
Q.40
__________ are normally subjected to sub-zero treatment.
Highly stressed parts
Gauges or precision parts
Cold rolled sheets
Non machinable materials
Q.41
Water-tube boiler is the one, in which
Water passes through tubes and flue gases around it
Tube carrying hot flue gases are immersed in a pool of water
Tubes are placed in vertical position
None of these
Q.42
The expected efficiency of a single rivetted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased __________ times.
Two
Four
Six
Eight
Q.43
Insulation of liquid surface can be achieved by __________ on top of its surface.
Floating hollow polypropylene spheres
Spraying alumina powder
Putting cement
None of these
Q.44
Streaklines, streamlines & pathlines are almost identical for __________ fluid flow.
Ideal
Uniform
Steady
None of these
Q.45
Austenite is not
Ductile
Malleable
Magnetic
Soft
Q.46
In the acid Bessemer process, the hot metal should have the following com-positon.
S < 0.05% and P < 0.05%
S < 0.05% and P < 1.5%
S < 0.05% and P > 1.5%
S > 1.5% and P < 0.05%
Q.47
The preferred alloying element for low temperature applications of steel is
Cr
N
Mo
Ni
Q.48
Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.
Grey
Black
Opaque
White
Q.49
Screws are specified by their __________ diameters.
Minor
Major
Pitch
None of these
Q.50
Primary designation of steel is based on its
Hardness & tensile strength
Carbon content
Iron content
Alloying elements content
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