ChE Fundamentals Flashcards
(114 cards)
1
Q
Incombustible and used in Fire Extinguisher
A
CCl4
2
Q
The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding __________ grinding wheel is normally used.
A
aluminium oxide
3
Q
Tin based white metals are used, where bearings are subjected to
A
high pressure & load.
4
Q
Friction factor for fluid flow in pipe does not depend upon the
A
pipe length
5
Q
alloying elements of steel which is hard and ductile
A
Nickel
6
Q
alloying elements of steel which is hard but brittle
A
Chromium
7
Q
type of bonding which is strongly directional in solids.
A
Covalent Bond
8
Q
strongest chemical bond
A
Covalent bond
9
Q
Fog is an example of colloidal system of
A
liquid dispersed in gas.
10
Q
Chromium molybdenum steel can not be welded using
A
electrical resistance
11
Q
Speisses is a mixture of
A
Arsenides of heavy metals.
12
Q
Auto collimator is used to check
A
angle
13
Q
In troposphere (the weather domain), the temperature ‘t’ at height ‘h’ above the sea level in metres is given by
A
t = 15 - 0.0065 h
14
Q
A high pressure boiler generates steam at a pressure greater than
A
80 kg/cm2
15
Q
Evaporative cooling process
A
removes sensible heat and adds latent heat
16
Q
It is a white powder and is very explosive
A
RDX - Royal Demolition Explosive / Research Development Explosive
aka cyclonite or hexogen
17
Q
RDX/ Cyclonite/Hexogen
A
C3H6N6O6
18
Q
A flammable toluene derivative, used as a high explosive and in the manufacture of dyestuffs and photographic chemicals.
A
TNT - Trinitrotoluene
19
Q
TNT - Trinitrotoluene
A
C7H5N3O6
20
Q
is an explosive and toxic crystalline compound frequently used in primers, blasting caps, and fuses. It is sensitive to heat, shock and friction.
A
Lead Azide
21
Q
It is a cellulose derivative often used as its sodium salt, sodium carboxymethyl cellulose. It is also used in cosmetic industry as thickener and binder.
A
CMC = Carboxymethyl cellulose (CMC) or cellulose gum.
22
Q
Maxwell’s thermodynamic relations applies to the
A
chemical systems in equilibrium.
23
Q
relates thermodynamical properties such as enthalpy, entropy and temperature to mechanical properties such as (Pressure or volume) of a system that is chemically in equilibrium wether its reversible o irrevesible.
A
Maxwell Thermodynamics Relations
24
Q
Annealing of white cast iron produces
A
malleable
25
Resistance of an electrical conductor is proportional to its
area & length
26
A solar cell converts the sunlight directly into
electrical energy
27
If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a
breeder reactor
28
Wrought iron is never shaped by
casting
29
Powder metallurgy process does not make metal powder by
hammering
30
In the blast furnace, incorporation of water vapour in the blast
Increases the reducing potential of the gas.
31
T or F: A ferromagnetic material becomes paramagnetic above the 'Curie temperature'.
True
32
T or F: Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials.
True
33
T or F: Soft magnetic materials (e.g., pure iron) have higher permeability and low hysteresis loss and coercive forces.
True
34
T or F: Tungsten steel and alnico are not hard magnetic materials.
False
35
The usual energy consumption in electric arc furnace steel making is
400 - 700 kWh/ton
36
Maximum permissible air velocity in pipelines is about
10 m/s
37
Area under the stress-strain curve up to the __________ is referred to as the modulus of resilience.
proportional limit
38
the hardest oxide and is hence used where high wear resistance at high temperature is required.
Alumina
39
Titanium alloys are welded using
Tungsten Inert Gas (TIG) welding
40
An alloy of Fe - 0.4 % C is
hypo-eutectoid steel
41
A material in which the atoms are arranged regularly in some directions but not in others, is termed as 'mesomorphous material'
lead
42
A steel with carbon fraction less than CS = 0.76%
hypo-eutectoid steel
ex. pearlite and a-ferrite
43
A steel with carbon fraction greater than CS = 0.76%
hyper-eutectoid steel
ex. cementite and pearlite
44
A steel with carbon fraction equals to CS = 0.76%
eutectoid steel
ex. purely pearlite
45
In extrusion of metals
Hollow ram is used for indirect extrusion.
46
Nuclear fission of one atom of uranium-235 produces the energy equivalent to about
200 MeV
47
parameters 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.
48
Machinability of hard alloys and tool steels is improved by
annealing
49
a heat treatment process that changes the physical and sometimes also the chemical properties of a material to increase ductility and reduce the hardness to make it more workable.
Annealing
50
Transformation range for ferrous material is the temperature interval during which __________ is formed during its heating.
austenite
51
Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.
grey body
52
In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that
water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam.
53
Cobalt - 60 is used as a source of __________ in medical therapy & industrial radiography.
γ-rays
54
Absolute zero pressure can be attained at a temperature of
0°R
55
The product out from a cupola is called
cast iron
56
Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as
Gr^0.25, Gr
57
If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity
remains unchanged
58
Electrical conductivities of semi-conductors are of the order of
10^-3 ohm/cm
59
Corrosion of metals can not be prevented by its
Tempering
60
the process of heating steel to a high temperature, though below the melting point, then allowing it to cool in still air. This process improves the machinability of the hardened steel while reducing the risk of cracks due to internal stresses.
Tempering
61
Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of
Grashoff number & Prandtl number
62
The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be
parabolic
63
Energy of the sun arises mainly from __________ reactions.
fusion
64
fastening devices has a head at one end and a nut fitted to the other
stud
65
In chemical dehumidification process
dry bulb temperature remains constant
66
Secondary hardening in steels arises out of the
decomposition of retained austenite upon heat treatment
67
Drills are usually made of
high speed steel
68
Tumbling is the process of improving the __________ of the materials/parts.
surface cleanliness
69
The __________ of a double acting reciprocating pump as compared to the single acting pump will be almost double.
flow output
70
__________ of air does not increase with increase in temperature.
Density
71
Spherical shape of mercury droplets is due to its
high surface tension
72
Sub zero treatment of steel is done to
reduce the retained austenite in hardened steel
73
Air-petrol ratio for maximum power generation in spark ignition engine is about
12:1
74
Which of the following varies as the square root of oil pressure during atomization of fuel oil through a pressure jet burner ?
Output & fineness
Velocity
75
The most suitable material of construction for a sewer to carry sewage under high pressure is
steel
76
Filler material used in welding should have __________ as compared to the parent metal to be welded.
same melting temperature
same composition
77
Oxygen cylinders used for autogenous (cutting/welding) purposes are
seamless & made of steel
78
Identify the correct statement.
Lead can be produced in a blast furnace
79
Dowtherm is a
high temperature heating medium (a petroleum product)
80
To counteract the bad effects of strain hardening on a cold formed part, it must be
annealed
81
The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then
wet bulb temperature=dry bulb temperature.
wet bulb temperature=dew point temperature.
saturation temperature=dew point temperature.
82
Galvanic corrosion cannot be prevented by
anodic protection
83
Fire in fuel gas pipelines is extinguished most effectively by
blanketing the area with nitrogen atmosphere
84
Which of the following is the most suitable abrasive for grinding high tensile strength materials ?
Aluminium oxide
85
Case hardening is NOT done by
hot dipping & electroplating
86
Satellites burn off during re-entry to earth's atmosphere, because of the
friction with earth's atmosphere
87
With increase in compression ratio, the volumetric efficiency of air compressor
increases
88
Neutrons are present in all atoms except that of
H
89
Biological shield in a nuclear reactor is generally provided to protect against the
gamma rays & neutrons
90
most commonly used to measure strain with the help of a strain gauge.
Voltage balancing potentiometric
91
most commonly used to measure strain with the help of a strain gauge.
Voltage balancing potentiometric
92
Which of the following is normally not found in both the S.I. (petrol) & C.I. (diesel) engines ?
Fuel injector
93
is a special constituent of chlorophyll without which photosynthesis is not possible.
Nitrogen
94
is used as a material of construction for the blade of power saw.
high speed steel
95
During decarburizing of a plain carbon steel, the thickness of ferrite layer growth is proportional to
square root of time
96
Laser welding is widely employed in the __________ industries.
electronic
97
Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the mixture. Dryness factor of steam is measured by a __________ calorimeter.
throttling
98
Which of the following is used to produce draught in the locomotive boilers ?
Steam jet arrangement
99
Temper brittleness of a material can be fairly detected by the __________ test.
notched bar impact
100
When the wavelength of incident X-rays increases, the angle of diffraction
decreases
101
The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is
more
102
The specific gravity of coal depends mainly on its __________ content.
moisture
103
In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is
equal
104
Normalising does not __________ of a metal.
remove internal stresses
105
Which of the following hardness tests does not measure the indentation hardness of metals and alloys ?
Shore sceleroscope test
106
With increase in annealing temperature, the following defect density decreases.
Vacancy
Dislocation
Grain boundary
107
Carnot cycle is also termed as the constant __________ cycle in thermodynamics.
heat
108
Thermistors are used in __________ devices.
temperature measuring
temperature compensating
109
Broaching tools are usually made of
high speed steel
110
The ratio of the shear stress to the principal stress on a principal plane is
0
111
Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank)
H/6
112
Propulsion of rocket follows from the
Newton's third law of motion.
113
In multipass welds, shot peening is done after each pass to
close the surface porosity.
114
Pick out the correct statement.
The elastic behaviour of rubber under compression is the same as its behaviour under tension.
