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INDIABIX > CHEMICAL ENGINEERING BASICS > Flashcards

CHEMICAL ENGINEERING BASICS Flashcards

1
Q

Which one of the following is incombustible ?
H2
CCl4
C2H2
S

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

aluminum 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

pipe length
pipe roughness
fluid density & viscosity
mass flow rate of fluid

A

pipe length

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5
Q

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

nickel
vanadium
molybdenum
chromium

A

nickel

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6
Q

The following type of bonding is strongly directional in solids.

Vander Waal’s
Ionic
Metallic
Covalant

A

Covalant

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7
Q

Fog is an example of colloidal system of

A

liquid dispersed in gas.

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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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11
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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12
Q

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

A

80

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13
Q

Evaporative cooling process employs a combination of cooling and humidification in which the

A

sensible heat is removed and the latent heat is added.

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14
Q

Which of the following is not an explosive ?

TNT
CMC
RDX
Lead azide

A

CMC

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15
Q

Maxwell’s thermodynamic relations applies to the

A

chemical systems in equilibrium

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16
Q

Annealing ofwhite cast iron produces __________ iron

A

malleable

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17
Q

Resistance of an electrical conductor is proportional to its (where, l = length and A = cross-sectional area of the conductor)
a. A
b. l
c. A^2
d. both ‘a’ & ‘b’

A

d. both ‘a’ & ‘b’

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18
Q

A solar cell converts the sunlight directly into __________ energy.

A

electrical

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19
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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20
Q

Wrought iron is never shaped by

A

casting

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21
Q

Powder metallurgy process does not make metal powder by

A

hammering

22
Q

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

A

increasing the reducing potential of the gas

23
Q

Pick out the wrong statement.
A. A ferromagnetic material becomes paramagnetic above the ‘Curie temperature’.
B. Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials.
C. Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces.
D. Tungsten steel and alnico are not hard magnetic materials.

A

Tungsten steel and alnico are not hard magnetic materials.

24
Q

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

A

400-700

25
Q

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

A

10

26
Q

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

A

proportional limit

27
Q

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

A

Alumina

28
Q

Titanium alloys are welded using the Following process:

A

TIG welding

29
Q

An alloy of Fe - 0.4 % C is

A

hypo-eutectoid steel.

30
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

31
Q

In extrusion of metals, which of the following statement is true ?

A

Hollow ram is used for indirect extrusion.

32
Q

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

A

200

33
Q

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 ?
A. Emissivity of pipe surface.
B. Diameter & length of the pipe.
C.Temperature of hot pipe surface & that of air in the room.
D. none of these

A

D. none of these

34
Q

Machinability of hard alloys and tool steels is improved by

A

annealing

35
Q

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

A

austenite

36
Q

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

A

grey

37
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.

38
Q

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

A

γ-rays

39
Q

Absolute zero pressure can be attained at a temperature of

A

0°R

40
Q

The product out from a cupola is called

A

cast iron

41
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

42
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

43
Q

Copper deposits are found in India at the following location:

A

Khetri

44
Q

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

A

10^-3

45
Q

Corrosion of metals can not be prevented by its

A

tempering

46
Q

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

A

Grashoff number & Prandtl number.

47
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

48
Q

Energy of the sun arises mainly from __________ reactions.

A

fusion

49
Q

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

A

Stud

50
Q

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

A

storm

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