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ChE Fundamentals Flashcards

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1
Q

Incombustible and used in Fire Extinguisher

A

CCl4

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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

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3
Q

Tin based white metals are used, where bearings are subjected to

A

high pressure & load.

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4
Q

Friction factor for fluid flow in pipe does not depend upon the

A

pipe length

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5
Q

alloying elements of steel which is hard and ductile

A

Nickel

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6
Q

alloying elements of steel which is hard but brittle

A

Chromium

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7
Q

type of bonding which is strongly directional in solids.

A

Covalent Bond

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8
Q

strongest chemical bond

A

Covalent bond

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9
Q

Fog is an example of colloidal system of

A

liquid dispersed in gas.

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10
Q

Chromium molybdenum steel can not be welded using

A

electrical resistance

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11
Q

Speisses is a mixture of

A

Arsenides of heavy metals.

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12
Q

Auto collimator is used to check

A

angle

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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

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14
Q

A high pressure boiler generates steam at a pressure greater than

A

80 kg/cm2

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15
Q

Evaporative cooling process

A

removes sensible heat and adds latent heat

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16
Q

It is a white powder and is very explosive

A

RDX - Royal Demolition Explosive / Research Development Explosive
aka cyclonite or hexogen

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17
Q

RDX/ Cyclonite/Hexogen

A

C3H6N6O6

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18
Q

A flammable toluene derivative, used as a high explosive and in the manufacture of dyestuffs and photographic chemicals.

A

TNT - Trinitrotoluene

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19
Q

TNT - Trinitrotoluene

A

C7H5N3O6

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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

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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.

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22
Q

Maxwell’s thermodynamic relations applies to the

A

chemical systems in equilibrium.

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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

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24
Q

Annealing of white cast iron produces

A

malleable

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25
Q

Resistance of an electrical conductor is proportional to its

A

area & length

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26
Q

A solar cell converts the sunlight directly into

A

electrical energy

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27
Q

If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a

A

breeder reactor

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28
Q

Wrought iron is never shaped by

A

casting

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29
Q

Powder metallurgy process does not make metal powder by

A

hammering

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30
Q

In the blast furnace, incorporation of water vapour in the blast

A

Increases the reducing potential of the gas.

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31
Q

T or F: A ferromagnetic material becomes paramagnetic above the ‘Curie temperature’.

A

True

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32
Q

T or F: Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials.

A

True

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33
Q

T or F: Soft magnetic materials (e.g., pure iron) have higher permeability and low hysteresis loss and coercive forces.

A

True

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34
Q

T or F: Tungsten steel and alnico are not hard magnetic materials.

A

False

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35
Q

The usual energy consumption in electric arc furnace steel making is

A

400 - 700 kWh/ton

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36
Q

Maximum permissible air velocity in pipelines is about

A

10 m/s

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37
Q

Area under the stress-strain curve up to the __________ is referred to as the modulus of resilience.

A

proportional limit

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38
Q

the hardest oxide and is hence used where high wear resistance at high temperature is required.

A

Alumina

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39
Q

Titanium alloys are welded using

A

Tungsten Inert Gas (TIG) welding

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40
Q

An alloy of Fe - 0.4 % C is

A

hypo-eutectoid steel

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41
Q

A material in which the atoms are arranged regularly in some directions but not in others, is termed as ‘mesomorphous material’

A

lead

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42
Q

A steel with carbon fraction less than CS = 0.76%

A

hypo-eutectoid steel
ex. pearlite and a-ferrite

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43
Q

A steel with carbon fraction greater than CS = 0.76%

A

hyper-eutectoid steel
ex. cementite and pearlite

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44
Q

A steel with carbon fraction equals to CS = 0.76%

A

eutectoid steel
ex. purely pearlite

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45
Q

In extrusion of metals

A

Hollow ram is used for indirect extrusion.

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46
Q

Nuclear fission of one atom of uranium-235 produces the energy equivalent to about

A

200 MeV

47
Q

parameters RESPONSIBLE for the heat loss from a hot steam carrying bare pipe surface located in a room without fans

A

-Emissivity of pipe surface.
-Diameter & length of the pipe.
-Temperature of hot pipe surface & that of air in the room.

48
Q

Machinability of hard alloys and tool steels is improved by

A

annealing

49
Q

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.

A

Annealing

50
Q

Transformation range for ferrous material is the temperature interval during which __________ is formed during its heating.

A

austenite

51
Q

Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.

A

grey body

52
Q

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

A

water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam.

53
Q

Cobalt - 60 is used as a source of __________ in medical therapy & industrial radiography.

A

γ-rays

54
Q

Absolute zero pressure can be attained at a temperature of

A

0°R

55
Q

The product out from a cupola is called

A

cast iron

56
Q

Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as

A

Gr^0.25, Gr

57
Q

If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity

A

remains unchanged

58
Q

Electrical conductivities of semi-conductors are of the order of

A

10^-3 ohm/cm

59
Q

Corrosion of metals can not be prevented by its

A

Tempering

60
Q

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.

A

Tempering

61
Q

Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of

A

Grashoff number & Prandtl number

62
Q

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

A

parabolic

63
Q

Energy of the sun arises mainly from __________ reactions.

A

fusion

64
Q

fastening devices has a head at one end and a nut fitted to the other

A

stud

65
Q

In chemical dehumidification process

A

dry bulb temperature remains constant

66
Q

Secondary hardening in steels arises out of the

A

decomposition of retained austenite upon heat treatment

67
Q

Drills are usually made of

A

high speed steel

68
Q

Tumbling is the process of improving the __________ of the materials/parts.

A

surface cleanliness

69
Q

The __________ of a double acting reciprocating pump as compared to the single acting pump will be almost double.

A

flow output

70
Q

__________ of air does not increase with increase in temperature.

A

Density

71
Q

Spherical shape of mercury droplets is due to its

A

high surface tension

72
Q

Sub zero treatment of steel is done to

A

reduce the retained austenite in hardened steel

73
Q

Air-petrol ratio for maximum power generation in spark ignition engine is about

A

12:1

74
Q

Which of the following varies as the square root of oil pressure during atomization of fuel oil through a pressure jet burner ?

A

Output & fineness
Velocity

75
Q

The most suitable material of construction for a sewer to carry sewage under high pressure is

A

steel

76
Q

Filler material used in welding should have __________ as compared to the parent metal to be welded.

A

same melting temperature
same composition

77
Q

Oxygen cylinders used for autogenous (cutting/welding) purposes are

A

seamless & made of steel

78
Q

Identify the correct statement.

A

Lead can be produced in a blast furnace

79
Q

Dowtherm is a

A

high temperature heating medium (a petroleum product)

80
Q

To counteract the bad effects of strain hardening on a cold formed part, it must be

A

annealed

81
Q

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

A

wet bulb temperature=dry bulb temperature.
wet bulb temperature=dew point temperature.
saturation temperature=dew point temperature.

82
Q

Galvanic corrosion cannot be prevented by

A

anodic protection

83
Q

Fire in fuel gas pipelines is extinguished most effectively by

A

blanketing the area with nitrogen atmosphere

84
Q

Which of the following is the most suitable abrasive for grinding high tensile strength materials ?

A

Aluminium oxide

85
Q

Case hardening is NOT done by

A

hot dipping & electroplating

86
Q

Satellites burn off during re-entry to earth’s atmosphere, because of the

A

friction with earth’s atmosphere

87
Q

With increase in compression ratio, the volumetric efficiency of air compressor

A

increases

88
Q

Neutrons are present in all atoms except that of

A

H

89
Q

Biological shield in a nuclear reactor is generally provided to protect against the

A

gamma rays & neutrons

90
Q

most commonly used to measure strain with the help of a strain gauge.

A

Voltage balancing potentiometric

91
Q

most commonly used to measure strain with the help of a strain gauge.

A

Voltage balancing potentiometric

92
Q

Which of the following is normally not found in both the S.I. (petrol) & C.I. (diesel) engines ?

A

Fuel injector

93
Q

is a special constituent of chlorophyll without which photosynthesis is not possible.

A

Nitrogen

94
Q

is used as a material of construction for the blade of power saw.

A

high speed steel

95
Q

During decarburizing of a plain carbon steel, the thickness of ferrite layer growth is proportional to

A

square root of time

96
Q

Laser welding is widely employed in the __________ industries.

A

electronic

97
Q

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.

A

throttling

98
Q

Which of the following is used to produce draught in the locomotive boilers ?

A

Steam jet arrangement

99
Q

Temper brittleness of a material can be fairly detected by the __________ test.

A

notched bar impact

100
Q

When the wavelength of incident X-rays increases, the angle of diffraction

A

decreases

101
Q

The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is

A

more

102
Q

The specific gravity of coal depends mainly on its __________ content.

A

moisture

103
Q

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

A

equal

104
Q

Normalising does not __________ of a metal.

A

remove internal stresses

105
Q

Which of the following hardness tests does not measure the indentation hardness of metals and alloys ?

A

Shore sceleroscope test

106
Q

With increase in annealing temperature, the following defect density decreases.

A

Vacancy
Dislocation
Grain boundary

107
Q

Carnot cycle is also termed as the constant __________ cycle in thermodynamics.

A

heat

108
Q

Thermistors are used in __________ devices.

A

temperature measuring
temperature compensating

109
Q

Broaching tools are usually made of

A

high speed steel

110
Q

The ratio of the shear stress to the principal stress on a principal plane is

A

0

111
Q

Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank)

A

H/6

112
Q

Propulsion of rocket follows from the

A

Newton’s third law of motion.

113
Q

In multipass welds, shot peening is done after each pass to

A

close the surface porosity.

114
Q

Pick out the correct statement.

A

The elastic behaviour of rubber under compression is the same as its behaviour under tension.

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