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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Priming is needed in a __________ pump.

reciprocating

gear

centrifugal

diaphragm

[#]

The peripherial velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec.

1.8

12.4

186.2

736.4

[#]

The energy loss over a length of pipeline according to Darcy-Weisbach equation for pipe flow is.....the mean velocity of flow.

directly proportional to

directly proportional to square of

inversely proportional to

inversely proportional to square of

[#]

Osmotic pressure of a dilute solution of a non volatile solute in a solvent obeying Raoult's law is proportional to the

temperature.

volume of solution.

moles of non-volatile solute.

none of these.

[#]

Cyclones are used primarily for separating

solids

solids from fluids

liquids

solids from solids

[#]

Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator?

Cresylic acid

Copper sulphate

Calcium carbonate

Sodium carbonate

[#]

The purpose of tanning in leather industry is to

stiffen the leather.

smoothen the leather.

make it flexible.

impart water resistance.

[#]

Raw Kerosene has a smoke point of 15 mm. After it is subjected to dearomatisation by liquid SO₂ extraction (Edeleanu process), its smoke point may become __________ mm.

100

[#]

Which of the following diagrams does not represent an Otto cycle ?

none of these

[#]

10.

In a reversible process

Tds = dE + dW

dE - dW = Tds

dW - dE = Tds

Tds - dW + dE >0

[#]

11.

The conversion in a mixed reactor/accomplishing a reaction A

3R is 50% when gaseous reactant 'A' is introduced at the rate of 1 litre/second and the leaving flow rate is 2 litres/second. The holding time for this operation is __________ second.

0.5

[#]

12.

One kg of carbon for theoretically complete combustion requires __________ kg of air.

11.5

0.5

[#]

13.

The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the __________ stress.

working

damaging

allowable

none of these

[#]

14.

Which one is the radioactive isotope of hydrogen ?

Deuterium

Ortho-hydrogen

Tritium

None of these

[#]

15.

Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is

neutralised by alkali treatment.

left as such without any treatment.

diluted with fresh water to reduce its acidity.

none of these.

[#]

16.

Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes

fire hazards.

explosion hazards.

persistent foam.

depletion of dissolved oxygen.

[#]

17.

Lime contains about 90% CaO. Percentage CaO present in limestone is about

[#]

18.

Minimum thermal efficiency of a steam boiler may be around __________ percent

[#]

19.

Multistage compression of air as compared to single stage compression offers the advantage of

power saving per unit weight of air delivered.

moisture elimination in the inter-stage cooler.

increased volumetric efficiency.

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

[#]

20.

Volute casing of a centrifugal pump does not facilitate

uniform flow of fluid coming out of the impeller.

increase in the pump efficiency.

conversion of the part of the velocity head to the pressure head.

conversion of the part of the pressure head to velocity head.

[#]

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