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Chemical Engineering
Chemical Engineering Basics
Quiz 21
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Q.1
As the fluid flow rate increases, the float of the rotameter
Rises in the tube
Rotates at higher speed
Rotates at lower speed
Drops down in the tube
Q.2
Even minute presence of impurities in copper impairs its electrical conductivity seriously. Electrolytic refinning of blister copper is resorted to, when
Cheap electricity is available
The precious metal content of copper is high
There is a demand for ultrapure (99.99%) electrolytic copper
All of the above
Q.3
The most suitable material for a sewer for carrying storm water is
Asbestos cement
Cast iron
Mild steel
Cement concrete
Q.4
Window panes of aeroplanes are normally made of
Perspex (PMMA)
Teflon (PTFE)
Bakelite (phenol formaldehyde)
Polystyrene
Q.5
Viscoelastic behaviour is observed in __________ materials.
Non-crystalline organic polymeric
Ceramic
All crystalline
All of the above
Q.6
The value of y = c
p
/c
v
. at < 500°C for air & most common gases can be safely assumed to be
0.8
1
1.4
1.8
Q.7
The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element.
Silicon
Carbon
Phosphorous
Chromium
Q.8
Addition of __________ to steel can not impart it high strength at elevated temperature.
Nickel
Magnesium
Silicon
Manganese
Q.9
Lead percentage in pure galena is about
8.6
86.6
35.8
61.4
Q.10
A material in which the atoms are arranged regularly in some directions but not in others, is termed as 'mesomorphous material'; an example of which is
Lead
Glass
Mica
Silver
Q.11
Steel containing low percentage of nickel, chromium & tungsten are termed as the __________ steel.
Wrought
Tool
Alloy
Plain carbon
Q.12
Which of the following alloying elements is present in maximum percentage in high speed steel.
Molybdenum
Chromium
Tungsten
Vanadium
Q.13
Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)
1/k
k
k²
1
/
k²
Q.14
If Reynolds number is greater than 1, then the
Viscous force is larger than the inertia force
Inertia force is larger than the viscous force
Inertia force is larger than the surface tension force
Inertia force is larger than the gravitational force
Q.15
Electrolytes conduct electric current by
The movement of ions
The movement of molecules
Allowing electrons to flow through them from cathode to anode
Movement of electric charge through them
Q.16
In chemical dehumidification of air
Both specific humidity & dry bulb temperature increases
Both specific humidity & dry bulb temperature decreases
Specific humidity decreases & dry bulb temperature increases
Specific humidity increases & dry bulb temperature decreases
Q.17
Liquid nitrogen containers can be made from
Ferritic stainless steel
HSLA steel
Titanium
Austenitic stainless steel
Q.18
Material of construction of the electrode used in the electric resistance welding is
Stainless steel
Graphite
Copper
Steel
Q.19
Silicon percentage in silicon steel used for electrical equipments is about
1
4.0
8
14
Q.20
When a copper ball is heated, the largest percentage increase will be in its
Radius
Area
Mass
Volume
Q.21
Which of the following is termed as the boiler mounting ?
Feed water pump
Steam superheater
Blow off cock
Economiser
Q.22
Which of the following is termed as the boiler mounting ?
Superheater
Economiser
Blow off cock
Feed pump
Q.23
Value of a material is usually considered as a relationship between
Cost and profit
Utility and appearance
Utility and cost
Reliability and utility
Q.24
According to thermodynamic Farenhite scale, the fundamental interval between ice point to steam point is
180°
212°
32°
273°
Q.25
Specific gravity of a metal, which weighs 5 kg in air and 4 kg when submerged in water, will be
5
1.25
2.5
3.75
Q.26
Faraday's law of electrolysis is related to the
Cation speed
Atomic number of the cation
Equivalent mass of the electrolyte
None of these
Q.27
Stellite is a trade name for the
Cermets
Ferrous cast alloys
Non-ferrous cast alloys
Products made by powder metallurgy techniques
Q.28
__________ cycle is the most efficient thermodynamic cycle.
Diesel
Otto
Rankine
Carnot
Q.29
For a spontaneous natural process at constant temperature and pressure, the free energy of the system always
Increases
Decreases
Remains constant
Increases to a maximum before decreasing
Q.30
Nitriding of a steel part does not increase its
Grain size
Fatigue limit
Surface hardness
Wear resistance
Q.31
When an isolated thermodynamic system executes a process,
Work is done
Heat transfer takes place
Mass flow occurs across the boundary of the system
No chemical reaction takes place within the system
Q.32
In chemical dehumidification process
Wet bulb temperature increases
Dry bulb temperature remains constant
Dew point temperature increases
Dry bulb temperature increases
Q.33
Spherical shape of mercury droplets is due to its
High viscosity
Low surface tension
High density
High surface tension
Q.34
Which of the following polymers is obtained by copolymerisation of three monomers?
SAN
ABS
SBR
PTFE
Q.35
With decrease in the grain size of a material, its creep resistance
Increases
Decreases
Remains constant
Either A or B ; depends on the material
Q.36
Normal dosage of chlorine in public water supply scheme ranges from __________ ppm.
0.5 to 1
10 to 15
300 to 500
1000 to 1500
Q.37
If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity
Is trebled
Remains unchanged
Decreases by a factor of √3
Decreases by a factor of
1
/
3
Q.38
Which of the following transducers is most commonly used for the measurement of shock and vibration ?
Linear variable differential transducer (LVDT)
Dial gauge
Accelerometer
None of these
Q.39
The burnout heat flux in the nucleate boiling regime is not a function of the
Liquid density
Vapour density
Temperature difference
Heat of evaporation
Q.40
The cost of providing service in a queing system decreases with the
Increased mean time in the queue
Increased arrival rate
Decreased mean time in the queue
Decreased arrival rate
Q.41
Nickel and __________ are the alloying element added in steel to increase its toughness.
Molybdenum
Chromium
Vanadium
Silicon
Q.42
The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong
Base and strong acid
Base and weak acid
Acid and weak base
None of these
Q.43
In a fuel cell, chemical energy is converted into
Electrical energy directly
Mechanical energy
Electrical energy and stored therein
None of these
Q.44
Out of the following surfaces, the emis-sivity will be minimum for
Aluminium foil
Concrete
Plaster
Smooth glass
Q.45
Which set of materials is used as a moderator in nuclear reactor?
Zircalloy & berrylium
Zircalloy & heavy water
Zirconium & berrylium
Heavy water & berrelium
Q.46
Metalloids
Are good conductor of heat & electricity
Act as electron donors with metals & as electron acceptor with non-metals
Are not necessarily solids at room temperature
Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron
Q.47
Temperature attained in soldering of metals is about __________ °C.
150-300
400-500
650-800
1000-1100
Q.48
Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water)?
Aluminium
Copper
Titanium
Stainless steel
Q.49
Which of the following is not a principal alloying element for the structural steel?
Molybednum
Nickel
Manganese
Chromium
Q.50
The speed of sound will be maximum in
Vacuum
Metal
Air
Water
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