Chemical Engineering Basics

Question 1

incombustible

Answer 1

CCl4

Question 2

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.

Answer 2

aluminium oxide

Question 3

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

Answer 3

high pressure & load.

Question 4

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

Answer 4

pipe length.

Question 5

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

Answer 5

nickel

Question 6

Fog is an example of colloidal system of

Answer 6

liquid dispersed in gas.

Question 7

type of bonding is strongly directional in solids.

Answer 7

Covalant

Question 8

Chromium molybdenum steel can not be welded using __________ welding.

Answer 8

electrical resistance

Question 9

Speisses is a mixture of the following

Answer 9

Arsenides of heavy metals.

Question 10

Auto collimator is used to check

Answer 10

angle

Question 10

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.)

Answer 10

t = 15 - 0.0065 h

Question 11

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

Answer 11

80

Question 12

Maxwell’s thermodynamic relations applies to the

Answer 12

chemical systems in equilibrium.

Question 13

Annealing of white cast iron produces __________ iron.

Answer 13

malleable

Question 14

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

Answer 14

both ‘a’ & ‘b’

Question 15

A solar cell converts the sunlight directly into __________ energy.

Answer 15

electrical

Question 16

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

Answer 16

breeder

Question 17

Wrought iron is never shaped by

Answer 17

casting

Question 18

Powder metallurgy process does not make metal powder by

Answer 18

hammering

Question 19

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

Answer 19

Increases the reducing potential of the gas.

Question 20

Pick out the wrong statement.

Answer 20

Tungsten steel and alnico are not hard magnetic materials.

Question 21

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

Answer 21

400 - 700

Question 22

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

Answer 22

10

Question 23

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

Answer 23

Alumina

Question 24

Titanium alloys are welded using the Following process:

Answer 24

TIG welding.

Question 25

An alloy of Fe - 0.4 % C is

Answer 25

hypo-eutectoid steel.

Question 26

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

Answer 26

lead

Question 27

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

Answer 27

200

Question 28

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

Answer 28

none of these.

Question 29

Machinability of hard alloys and tool steels is improved by

Answer 29

annealing

Question 30

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

Answer 30

austenite

Question 31

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

Answer 31

grey

Question 32

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

Answer 32

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

Question 33

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

Answer 33

γ-rays

Question 34

The product out from a cupola is called

Answer 34

cast iron

Question 35

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

Answer 35

Gr0.25, Gr

Question 36

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

Answer 36

remains unchanged.

Question 37

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

Answer 37

10-3

Question 38

Corrosion of metals can not be prevented by its

Answer 38

tempering

Question 38

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

Answer 38

Grashoff number & Prandtl number.

Question 38

The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area.

Answer 38

parabolic

Question 39

Energy of the sun arises mainly from __________ reactions.

Answer 39

fusion

Question 40

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

Answer 40

stud

Question 41

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

Answer 41

Storm

Question 42

In chemical dehumidification process

Answer 42

dry bulb temperature remains constant.

Question 43

Secondary hardening in steels arises out of the

Answer 43

decomposition of retained austenite upon heat treatment.

Question 44

Drills are usually made of

Answer 44

high speed steel

Question 45

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

Answer 45

surface cleanliness

Question 46

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

Answer 46

flow output

Question 47

__________ of air does not increase with increase in temperature.

Answer 47

Density

Question 48

Spherical shape of mercury droplets is due to its

Answer 48

high surface tension.

Question 49

Sub zero treatment of steel is done to

Answer 49

reduce the retained austenite in hardened steel.

Question 50

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

Answer 50

12 : 1

Question 51

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

Answer 51

Both (a) & (b)

Question 52

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

Answer 52

steel

Question 53

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

Answer 53

seamless & made of steel.

Question 54

Identify the correct statement

Answer 54

Lead can be produced in a blast furnace.

Question 55

Dowtherm is a

Answer 55

high temperature heating medium (a petroleum product)

Question 56

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

Answer 56

annealed

Question 57

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

Answer 57

all 'a' , 'b' & 'c'

Question 58

Galvanic corrosion can not be prevented by

Answer 58

anodic protection.

Question 59

Fire in fuel gas pipelines is extinguished most effectively by

Answer 59

blanketting the area with nitrogen atmosphere.

Question 60

he most suitable abrasive for grinding high tensile strength materials

Answer 60

Aluminium oxide