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Chemical Engineering Basics
Quiz 14
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Q.1
Lead is added to 60:40 brass primarily to improve
Machinability
Corrosion resistance
Fluidity
Strength
Q.2
Specific __________ is a dimensionless quantity.
Heat
Humidity
Weight
None of these
Q.3
Deformation band is absent in materials having __________ lattice crystal structure.
Fcc
Bcc
Hcp
None of these
Q.4
The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at __________ percent relative humidity.
0
100
50
None of these
Q.5
Which is the most lethal weapon ?
Atom (fusion) bomb
Hydrogen bomb
Cobalt bomb
Neutron bomb
Q.6
Out of the following, the most ductile material is
Mild steel
Copper
Nickel
Aluminium
Q.7
With increase in temperature, the surface tension of water
Increases
Decreases
Remains constant
Increases linearly
Q.8
Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of
1:1
1:2
2:1
1:4
Q.9
__________ of air does not increase with increase in temperature.
Density
Thermal diffusivity
Viscosity
Thermal conductivity
Q.10
Cascade control is
The continuous adjustment of the set point index of an automatic control loop by a primary (master) controller
Used when changes in process conditions cause serious upsets in the controlled variable
Useful to control flow from temperature
All of the above
Q.11
Case hardening is not done by
Nitriding
Hot dipping
Electroplating
Both B & C
Q.12
Cassiterite is an ore of
Tin
Lead
Molybdenum
Chromium
Q.13
The maximum percentage of chromium that can be added to steel is about
12
18
24
30
Q.14
Vernier calipers can not be used to measure the
I.D. & O.D. of the shaft
Thickness of parts
Depth of holes
Clearance between two mating surfaces
Q.15
The majority charge carriers in p-type silicon are
Free electrons
Ions
Conduction electrons
Holes
Q.16
The size of the tetrahedral void in the closest packing of atoms is __________ that of the octahedral void.
Equal to
Greater than
Less than
Either A, B or C; depends on the size of atom
Q.17
Scaling occurs in boiler tubes due to the fact that, the solubility of Ca(OH)₂ __________ with increasing temperature.
Increases
Decreases
Shows inversion of solubility
None of these
Q.18
Out of the following, the lowest packing of atoms exists in __________ crystal lattice structure.
Hexagonal close, packed (hcp)
Face centred cubic (fcc)
Body centred cubic (bcc)
Simple cubic
Q.19
A psychrometer does not measure the __________ temperature of moist air.
Dew point
Dry bulb
Wet bulb
None of these
Q.20
Carnot cycle is also termed as the constant __________ cycle in thermodynamics.
Entropy
Pressure
Volume
Heat
Q.21
Pick out the wrong statement.
The equivalent stiffness of two springs (of equal stiffness
For a helical spring, deflection is proportional to D³ (D = mean coil diameter) or d⁴ (d = wire diameter)
Crushing load or columns is less than the buckling load
Modulus of resilience is proportional to ( stress at elastic limit)2
Q.22
Grain hardness is measured by the __________ hardness testing method.
Knoop
Rockwell F
Shore sceleroscope
Vicker's
Q.23
Out of the following, which will fracture most readity, when hit with a hard hammer ?
Brass
Bronze
German silver
Cast iron
Q.24
Dezincification is a form of corrosion, which specifically applies to
Steel
Brass
Stainless steel
Babbit metal
Q.25
__________ can replace tungsten in high speed steel.
Chromium
Vanadium
Cobalt
Molybdenum
Q.26
'Flare tower' used in industry is meant for
Venting off (after burning) the excess inflammable/toxic gases at high pressure
Absorbing the pollutant gases from the furnace exhaust
Cooling of furnace exhaust gases
None of these
Q.27
Two solutions A₁ & A₂ have pH value of 2 & 6 respectively. It implies that the solution
A₁ is more alkaline than solution A₂
A₁ is highly acidic
A₂ is very slightly acidic
Both B & C
Q.28
The heat treatment to which the steel wire containing > 0.25% carbon is subjected to is
Full annealing
Bright annealing
Patenting
None of these
Q.29
Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as
Re
0.5
, Re
0.8
Re
0.8
, Re
-0.5
Re
0.8
, Re
0.5
Re
-0.8
, Re
0.5
Q.30
Oxygen cylinders used for autogenous (cutting/welding) purposes are
Seamless & made of steel
Heat treated before use
Made by sand casting
Welded steel cylinders
Q.31
Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans ?
Emissivity of pipe surface
Diameter & length of the pipe
Temperature of hot pipe surface & that of air in the room
None of these
Q.32
Oxyacetylene reducing flame is used while carrying out welding on
Alloy steel
Grey cast iron
Mild steel
High carbon steel
Q.33
Oxyacetylene reducing flame is used while carrying out welding on
Alloy steel
Grey cast iron
Mild steel
High carbon steel
Q.34
A jig is used while __________ a hole.
Boring
Counter boring
Drilling
Enlarging
Q.35
Which of the following heat treatment processes is usually applied to castings ?
Tempering
Annealing
Normalising
Carburising
Q.36
Compression ratio of an I.C. engine is the ratio of the
Clearance volume to the volume swept by piston per stroke
Volume of air in cylinder before compression to that after compression
Pressure after compression to that before compression
None of these
Q.37
The velocity at which individual particles from a fluidised bed are carried away by the fluid passing through it, is defined as the
Minimum fluidisation velocity
Terminal velocity
Elutriation velocity
Superficial velocity
Q.38
__________ of hard alloy and tool steel is done to make it easily machinable.
Case carburising
Tempering
Normalising
Annealing
Q.39
To improve the machinability of steel, it is generally subjected to
Spherodising
Tempering
Normalising
Annealing
Q.40
Out of the following, the dimensionless quantity is
Specific weight
Viscosity
Mach number
Density
Q.41
Load cells used for the measurement of weight has
Compact & rugged construction with an accuracy of 0.1 to 1%
No moving parts and incurs negligible deflection under load
Provision of thermal compensation and is hermetically sealed
All of the above
Q.42
Pick out the wrong statement.
Copper is the metal having the highest electronic conductivity
Hardenability & weldability of metals are inversely related
Covalant bonding formed by sharing of electrons is present in all semi-conductor materials
Glass transition temperature applies to 'polymers' but not to 'glasses'
Q.43
Protection of ship hulls against sea water corrosion is done by coating with zinc because of the fact that zinc compared to iron is
Reduced preferentially
Cheaper
Oxidised preferentially
Lighter
Q.44
Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C.
723
959
1147
1493
Q.45
High speed steel tools retain their hardness upto a temperature of __________ °C.
500
750
900
1100
Q.46
If the head is doubled in & centrifugal pump, the power required will increase in the ratio of
2
3
2
3/2
2
5/2
2
1/3
Q.47
Boiler draught of 10 mm water column is equivalent to
1 kgf/m²
10 kgf/m²
10 kgf/mm²
1 kgf/mm²
Q.48
Factor of safety is the ratio of the __________ stress to the working stress.
Tensile
Compressive
Yield
Bearing
Q.49
Electrolytic reduction cell used for conversion of calcined Al2O₃ to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to
Achieve very high purity of aluminium (99.9%)
Keep the electrolyte in liquid condition by the generation of heat
Electrolytically dissociate alumina
Both(b) & (c)
Q.50
The most suitable material of construction for a sewer to carry sewage under high pressure is
Asbestos cement
Steel
Cement concrete
Stoneware
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