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indiabix > Chemical Engineering Basics > Flashcards

Chemical Engineering Basics Flashcards

1
Q

incombustible

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

All of the following alloying elements of steel increases hardness but sacrifice ductility, except

A

nickel

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6
Q

Fog is an example of colloidal system of

A

liquid dispersed in gas.

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7
Q

type of bonding is strongly directional in solids.

A

Covalant

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8
Q

Chromium molybdenum steel can not be welded using __________ welding.

A

electrical resistance

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9
Q

Speisses is a mixture of the following

A

Arsenides of heavy metals.

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10
Q

Auto collimator is used to check

A

angle

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10
Q

In troposphere (the weather domain), the temperature ‘t’ at height ‘h’ above the sea level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)

A

t = 15 - 0.0065 h

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11
Q

A high pressure boiler generates steam at a pressure greater than __________ kg/cm2

A

80

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12
Q

Maxwell’s thermodynamic relations applies to the

A

chemical systems in equilibrium.

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13
Q

Annealing of white cast iron produces __________ iron.

A

malleable

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14
Q

Resistance of an electrical conductor is proportional to its (where, l = length and A = cross-sectional area of the conductor)

A

both ‘a’ & ‘b’

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15
Q

A solar cell converts the sunlight directly into __________ energy.

A

electrical

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16
Q

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

A

breeder

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17
Q

Wrought iron is never shaped by

A

casting

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18
Q

Powder metallurgy process does not make metal powder by

A

hammering

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19
Q

In the blast furnace, incorporation of water vapour in the blast gives the following effect.

A

Increases the reducing potential of the gas.

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20
Q

Pick out the wrong statement.

A

Tungsten steel and alnico are not hard magnetic materials.

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21
Q

The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.

A

400 - 700

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22
Q

Maximum permissible air velocity in pipelines is about __________ metre/second.

A

10

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23
Q

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

A

Alumina

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24
Q

Titanium alloys are welded using the Following process:

A

TIG welding.

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25
Q

An alloy of Fe - 0.4 % C is

A

hypo-eutectoid steel.

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26
Q

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

A

lead

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27
Q

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

A

200

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28
Q

following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans ?

A

none of these.

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29
Q

Machinability of hard alloys and tool steels is improved by

A

annealing

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30
Q

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

A

austenite

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31
Q

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

A

grey

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32
Q

In condensers used in thermal power plants, steam is normally used in shell side

A

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

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33
Q

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

A

γ-rays

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34
Q

The product out from a cupola is called

A

cast iron

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35
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

Gr0.25, Gr

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36
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.

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37
Q

Electrical conductivities of semi-conductors are of the order of __________ ohm/cm.

A

10-3

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38
Q

Corrosion of metals can not be prevented by its

A

tempering

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38
Q

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

A

Grashoff number & Prandtl number.

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38
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.

A

parabolic

39
Q

Energy of the sun arises mainly from __________ reactions.

A

fusion

40
Q

Which of the following fastening devices has a head at one end and a nut fitted to the other ?

A

stud

41
Q

Sudden fall of atmospheric pressure by a large amount is an indication of the

A

Storm

42
Q

In chemical dehumidification process

A

dry bulb temperature remains constant.

43
Q

Secondary hardening in steels arises out of the

A

decomposition of retained austenite upon heat treatment.

44
Q

Drills are usually made of

A

high speed steel

45
Q

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

A

surface cleanliness

46
Q

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

A

flow output

47
Q

__________ of air does not increase with increase in temperature.

A

Density

48
Q

Spherical shape of mercury droplets is due to its

A

high surface tension.

49
Q

Sub zero treatment of steel is done to

A

reduce the retained austenite in hardened steel.

50
Q

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

A

12 : 1

51
Q

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

A

Both (a) & (b)

52
Q

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

A

steel

53
Q

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

A

seamless & made of steel.

54
Q

Identify the correct statement

A

Lead can be produced in a blast furnace.

55
Q

Dowtherm is a

A

high temperature heating medium (a petroleum product)

56
Q

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

A

annealed

57
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

all ‘a’ , ‘b’ & ‘c’

58
Q

Galvanic corrosion can not be prevented by

A

anodic protection.

59
Q

Fire in fuel gas pipelines is extinguished most effectively by

A

blanketting the area with nitrogen atmosphere.

60
Q

he most suitable abrasive for grinding high tensile strength materials

A

Aluminium oxide

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