Online Chemical Engineering Test - Chemical Engineering Test - Random

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Total number of questions: 20.
Time allotted: 30 minutes.
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Pick out the correct statement pertaining to venturimeter.

A venturimeter with a fixed pressure drop discharges more, when the flow is vertically downward, than when the flow is vertically upward.

The co-efficient of contraction of a venturimeter is always unity.

For a fixed pressure drop, the discharge of a gas through a venturimeter is greater, when compressibility is taken into account, than when it is neglected.

none of these.

[#]

During a phase change process like sublimation, vaporisation, melting etc., the specific __________ does not change.

enthalpy

Gibbs free energy

internal energy

entropy

[#]

According to the kinetic theory, the thermal conductivity of a monoatomic gas is proportional to

T^0.5

T^1.5

T²

[#]

Weight of 56 litres of ammonia at N.T.P. is __________ gm.

2.5

42.5

2800

[#]

Pick out the correct statement.

The capacity and the effectiveness of a screen are the same.

The capacity and the effectiveness of screen are opposing factors.

The screening surface of a 'reel' (a revolving screen used in flour mills) is made of silk bolting cloth supported by wire mesh.

both (b) and (c).

[#]

Sucrose content in cane sugar may be around __________ percent.

[#]

Soap cannot be used with hard water, because

hard water contains sulphate.

they form insoluble calcium soaps which precipitate.

they attract back the removed dirt.

none of these.

[#]

Commercial production of soda ash by Solvay process requires limestone, __________ as raw materials.

coke and sand

brine and coal

coke and caustic soda

none of these

[#]

Commercial production of hydrogen for the manufacture of nitrogeneous fertilisers is done by

steam reforming of naphtha and cracking of natural gas.

electrolysis of water.

cryogenic separation of hydrogen from coke oven gas.

all (a), (b) and (c)

[#]

10.

Boyle's law for gases states that

, when temperature is constant.

, when temperature & mass of the gas remain constant.

P ∝ V, at constant temperature & mass of the gas.

= constant, for any gas.

[#]

11.

Thermodynamic equilibrium constant in a system is affected by

inerts

pressure

temperature

all (a), (b) & (c)

[#]

12.

If 'n' is the order of reaction, then unit of rate constant is

1/(time)(concentration)^{n - 1}

(time)^-1 (concentration)^{n - 1}

(time)^{n - 1} (concentration)

none of these

[#]

13.

Shock resisting steels should possess high

hardness

toughness

tensile strength

wear resistance

[#]

14.

Which of the following is not a copper based alloy with nickel ?

German silver

Monel metal

Inconel

Constantan

[#]

15.

Which of the following is not a component of depreciation cost ?

Repairs and maintenance cost.

Loss due to obsolescence of the equipment.

Loss due to decrease in the demand of product.

Loss due to accident/breakdown in the machinery.

[#]

16.

Which is the most stable crystalline form of silica at room temperature ?

Quartz

Cristobalite

Tridymite

None of these

[#]

17.

Which of the following pollutants is not emitted during volcanic eruptions ?

SO₂

H₂S

hydrocarbons

[#]

18.

Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in

coagulation and flocculation of colloids.

oxidation of carbonaceous matter to CO₂.

nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate.

all (a), (b) and (c).

[#]

19.

Which of the following is the most elastic material ?

Plastic

Glass

Steel

Rubber

[#]

20.

High endurance limit of carburised machine parts is because of the fact that carburisation

suppresses any stress concentration produced in the parts.

enhances the yield point of the material.

introduces a compressive layer on the surface.

produces a better surface finish.

[#]

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