Online Chemical Engineering Test - Chemical Engineering Basics Test 3

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Total number of questions: 20.
Time allotted: 30 minutes.
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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

Gr^0.25, Gr^0.33

Gr, Gr^0.25

Gr^0.33, Gr^0.25

[#]

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

Increases the reducing potential of the gas.

Increases the flame temperature.

No significant change occurs.

Increases the hydrogen content in the metal.

[#]

Salvage value is the most flexible criteria for analysing a financial investment. 'Salvaging' means

disposing off a machine/property on as is where is basis.

disposing off machine/property, which is no longer useful in the present scenerio.

mortgaging the obsolete machine/property.

writing off the obsolete machine/ property.

[#]

Titanium can be easily welded using __________ welding.

submerged arc

TIG

shielded metal arc

electroslag

[#]

The most prominent single cause of corrosion in boilertubes, drums, economisers and steam superheaters in a thermal power plant boiler is the

water alkalinity & leakage.

hydrazine addition during feed water treatment.

release of non-condensable gas from water in the boiler.

scale formation.

[#]

The main constituent of bones is

CaF₂

Ca₃(PO₄)₂

CaCO₃

CaCl₂

[#]

Pick out the wrong statement about powder metallurgy technique.

Powder metallurgy techniques are applied at room temperature.

Final product in powder metallurgy is not necessarily metallic powder.

The final product in powder metallurgy is made from metallic powder.

Silver and nickel when melted together do not mix to form an alloy ; however alloy of these constituents can be made by powder metallurgy technique.

[#]

Which of the following is termed as the boiler mounting ?

Feed water pump

Steam superheater

Blow off cock

Economiser

[#]

Out of the following, the best material capable of withstanding shock & vibration without the danger of cracking is

malleable iron

grey cast iron

chilled cast iron

white cast iron

[#]

10.

__________ number is sometimes used in place of Grashoff number in free convection heat transfer.

Stanton

Brinkman

Rayleigh

Nusselt

[#]

11.

Wrought iron does not have

uniform strength in all directions.

ability to hold protective coating.

high ductility & corrosion resistance.

easily weldable characteristics.

[#]

12.

Boiling point of water gets lowered at high altitudes (e.g., hills), because

temperature is low.

atmospheric pressure is low.

atmospheric pressure is high.

none of these.

[#]

13.

The type of pump used for lifting large quantity of sewage is a __________ pump.

gear

centrifugal

reciprocating

plunger

[#]

14.

On an average __________ fast neutrons are produced by nuclear fission of each atom of uranium-235.

2.5

3.5

[#]

15.

High __________ of cast iron makes it suitable for use in machine beds.

compressive strength

endurance strength

damping capacity

tensile strength

[#]

16.

Stellite is a trade name for the

cermets.

ferrous cast alloys.

non-ferrous cast alloys.

products made by powder metallurgy techniques.

[#]

17.

The highest stress that a material can withstand for a specified length of time without excessive deformation is called the __________ strength.

creep

endurance

fatigue

none of these

[#]

18.

Latent heat of dry steam at atmospheric pressure is 539 Kcal/kg; which __________ with increase in the pressure of steam.

decreases

increases

remains same

may increase or decrease

[#]

19.

Wrought iron is not

ductile & resistant to corrosion/rusting.

weldable easily.

having uniform strength in all directions.

having maximum tensile strength along the lines of slag distribution.

[#]

20.

Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of

lumps

pellets

briquettes

sinter

[#]

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Online Chemical Engineering Test - Chemical Engineering Basics Test 3

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