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Chemical Engineering Basics
Quiz 10
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Q.1
The property of material, by which a given amount of energy is absorbed by it, without plastic deformation is called
Resilience
Toughness
Ductility
Impact strength
Q.2
Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about
9:1
17 : 1
23 : 1
29 : 1
Q.3
Filler material used in welding having the lowest melting point out of the following is
Aluminium
Soft solder
Silver solder
Brazing spelter
Q.4
For the same heat input & compression ratio, efficiency of Otto cycle is higher than that of diesel cycle, because in Otto cycle.
Heat rejection is lower
Expansion & compression are isentropic
Maximum temperature is higher
Combustion is at constant volume
Q.5
In the Bayer's process, bauxite is digested under pressure using
H₂SO₄
NaOH
NH₃
HCl
Q.6
__________ forces do not act in case of fluids.
Vibratory
Centrifugal
Elastic
Tensile
Q.7
Powder metallurgy process does not make metal powder by
Atomisation
Grinding/milling
Hammering
Electrolytic deposition
Q.8
Circulation of liquid metal (i.e. molten sodium) in a liquid metal cooled nuclear reactor is done by a/an __________ pump.
Electromagnetic
Axial flow
Diaphragm
Reciprocating
Q.9
Which of the following is not a characteristic observed in material failure by fatigue fracture ?
Plastic deformation of material does not occur
Initiation of crack from below the surface does not occur
Initation of crack occurs on the surface of the machine part
Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface
Q.10
While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen flame is about __________ °C.
1800
2000
2400
3000
Q.11
The total frictional resistance to fluid flow does not depend upon the
Roughness of the surface
Fluid pressure
Fluid density
Fluid velocity
Q.12
Which of the following is a unit of time ?
Barn
Light year
Angstrom
None of these
Q.13
Dies for wire drawing are generally made of
Mild steel
Stainless steel
Carbides
High carbon steel
Q.14
When the wet steam is throttled but still remains wet at the exit of the throttle valve, then its temperature & dryness fraction respectively
Decreases & increases
Increases & increases
Increases & decreases
Decreases & decreases
Q.15
Cold chiesel & hammers are made of
High speed steel
High carbon steel
Forged steel
Mild steel
Q.16
In a casting, cold shut defect is caused by
Low pounhg temperature
Melt-mould reactions
Faulty gating system
Very low mould permeability
Q.17
In extrusion of metals, which of the following statement is true ?
Speed of the extruded material is same as that of ram speed
Redundant work is a function of the die angle
Relative motion between the billet surface and the container wall is always present
Hollow ram is used for indirect extrusion
Q.18
Surface tension is due to the __________ forces.
Viscous
Adhesive
Cohesive
All of these
Q.19
Pick out the wrong statement.
A ferromagnetic material becomes paramagnetic above the 'Curie temperature'
Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials
Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces
Tungsten steel and alnico are not hard magnetic materials
Q.20
Capacity & power requirement for an air compressor working at high altitude compared to sea-level will be
More
Less
Same
Either more or less; depends on the climatic conditions
Q.21
Routing in production, planning & control is concerned with the
Sequence of operation to be performed
Progress of work performed
Authorisation of work to be performed
Balancing of load on machines
Q.22
The emf of a Deniell cell Zn | Zn²⁺ || Cu²⁺ | Cu can be increased by
Decreasing the surface area of the electrodes
Increasing the concentration of zinc sulphate solution
Increasing the surface area of the electrodes
Increasing the concentration of copper sulphate solution
Q.23
Which of the following is an example of stress corrosion ?
Season cracking of brass
Caustic embrittlement of steel
Both (a) & (b)
Neither (a) nor (b)
Q.24
Angular displacement can be measured suitably by a
Shaft encoder
Linear variable differential transducer (LVDT)
Stroboscope
Tachometer
Q.25
Cold cracking in the heat affected zone of a high strength steel weld can take place because of the
Retained austenite
Martensite formation
Relatively high sulphur content in the base metal
Sufficient hydrogen present in the welding arc
Q.26
Which of the following are made out of the carbon steel having carbon content of 0.9 to 1% ?
Small punches, broaches reamers and springs
Cutlery, screws, rivets and files
Mandrels, twist drills, small lathe tools and razors
Forgings like can shaft, structural steel plate, threading dies and drawing dies
Q.27
Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of portland cement. The component of Portland cement which first hardens is
5CaO . 3 Al2O₃
3CaO . Al2O₃
3CaO . SiO₂
2CaO . SiO₂
Q.28
Function of feed check valve in a boiler is to
Facilitate circulation of high pressure feed water
Check the water level in the boiler drum
Prevent the back flow of water
Regulate the water flow to boiler
Q.29
Copper is not present as an alloying constituent in
Silicon bronze
Constantan
Nichrome
Delta metal
Q.30
Kinematic viscosity of water as compared to that of air is
More
Same
15% more
15% less
Q.31
Area under the stress-strain curve upto the __________ is referred to as the modulus of resilience.
Yield strength
Elastic limit
Proportional limit
Maximum point
Q.32
__________ test can be termed as the semi-distructive test.
Impact
Torsion
Hardness
Charpy
Q.33
A 2 kg object weighs 1.8 kgf on a spring balance. The value of 'g' at that location in m/seC₂ is
8.82
9.81
10.88
0.95
Q.34
Inspection of surface and sub-surface cracks in non-magnetic alloys is done by __________ testing method.
X-ray
Magnetic particle
Dye penetrant
Ultrasonic
Q.35
For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot ?
Temperature - entropy
Temperature - pressure
Enthalpy - entropy
Enthalpy-pressure
Q.36
In "Imperial Smelting Process" for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following :
Jet of water at high pressure
Blast of air
Mixture of water and air
Rain of molten lead
Q.37
Milligram of KOH required to saponify 1 gm of oil is called its __________ number.
Saponification
Acid
Precipitation
Emulsion
Q.38
A controller action in which there is a con-tinous relation between the values of controlled variable and the rate of change of conrolled output signal is called the __________ action.
Proportional
Integral
Derivative
None of these
Q.39
The weight of a body at the centre of the earth is
Infinite
Zero
Same as on the surface of the earth
None of these
Q.40
The efficiency of a Carnot heat engine operating between absolute temperatures T₁ and T₂ (when, T₁ > T₂) is given by (T₁ - T₂)/T₁. The co-efficient of performance (CO.P.) of a Carnot heat pump operating between T₁ and T₂ is given by
T₂/(T₁-T₂)
T₁/(T₁-T₂)
T₁/T₂
T₂/T₁
Q.41
Lead is poured into the joint between two __________ pipes.
Mild steel
Concrete
Cast iron
Asbestos cement
Q.42
Lead is poured into the joints between two __________ pipes.
Cast iron
Steel
Concrete
Plastic
Q.43
Free oxygen is removed from boiler feed water, because it
Reduces heat transfer co-efficient
Is corrosive
Causes explosion
None of these
Q.44
The ratio of coil diameter to wire diameter of a spring is called the spring
Index
Deflection
Form co-efficient
None of these
Q.45
Pick out the wrong statement about a fast breeder reactor.
Uses molten sodium as moderator
Converts fertile fuel into fissile fuel
Requires highly enriched fuel
Produces more fuel than it consumes
Q.46
Coke is added in the blast furnace to
Reduce & melt the iron ore
Increase the fluidity of slag
Remove sulphur & phosphorus from molten metal
None of these
Q.47
Castability of aluminium is increased by the addition of __________ in it.
Silicon
Manganese
Bismuth
Lead
Q.48
Speed of a submarine in deep sea & that of an aeroplane is measured by a/an
Pitot tube
Hot wire anemometer
Rotameter
Stroboscope
Q.49
Chlorine acts as a bleaching agent only in the presence of
Dry air
Pure oxygen
Moisture
Sunlight
Q.50
During sensible cooling of air, its wet bulb temperature
Decreases but dew point remains constant
Increases but dew point remains constant
Increases & the dew point decreases
Decreases & the dew point increases
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