Questions and answers for exam Preparation

MCQs

Total Questions : 1622 | Page 162 of 163 pages

Question 1611. Pick out the wrong statement ?

Pensky-Marten apparatus is used for determining flash points above 50°C
Characterisation factor of paraffinic crude oil is more than 12
Abel apparatus is used for determining flash points below 50°C
An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index

Discuss Question

Answer: Option D. -> An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1612. Waxy crudes are treated with chemical additives mainly to_________________________?

Depress its pour point
Dissolve wax
Precipitate wax
Remove wax

Discuss Question

Answer: Option A. -> Depress its pour point
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1613. Choose the correct statement ?

Octane number of i-octane is zero
Octane number of paraffins increases with increasing number of carbon atoms
Branched chain paraffins have higher octane number than straight chain paraffins with same number of carbon atoms
The aromatics have lower octane number than naphthenes with same number of carbon atoms

Discuss Question

Answer: Option A. -> Octane number of i-octane is zero
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1614. Pick out the wrong statement?

Multigrade lubricating oils have high viscosity index
Paraffinic oil has very high viscosity index
Naphthenic oil has very low viscosity index
High viscosity index means a large change in viscosity with change in temperature

Discuss Question

Answer: Option D. -> High viscosity index means a large change in viscosity with change in temperature
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1615. Pick out the wrong statement ?

Iso-paraffin crack faster than n-paraffin.
Catalytic cracking is endothermic, but the regeneration of catalyst is exothermic
Rate of decomposition of olefins in catalytic cracking is slightly slower than the thermal cracking
None of these

Discuss Question

Answer: Option B. -> Catalytic cracking is endothermic, but the regeneration of catalyst is exothermic
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1616. Choose the correct statement regarding thermal cracking ?

Moderate changes in operating temperature does not change the depth of cracking
Increased residence time results in the decreased severity of cracking
At low pressure, the yield of lighter hydrocarbons are more
Greater depth of cracking gives lower octane number gasoline

Discuss Question

Answer: Option D. -> Greater depth of cracking gives lower octane number gasoline
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1617. Pick out the correct statement pertaining to catalytic cracking ?

With increase in the reactor pressure, octane number of gasoline decreases
With increase in the reactor temperature, gasoline yield decreases for a given conversion
Percentage conversion increases with increase in the catalyst to oil ratio
All A., B. and C.

Discuss Question

Answer: Option D. -> All A., B. and C.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1618. Pick out the wrong statement ?

Alkylation produces a larger iso-paraffin (having higher octane number) from the reaction of an olefin with smaller iso-paraffin
Catalytic alkylation processes use HF, AlCl3 & H2SO4 as Catalysts
All the alkylation processes use very high temperature (> 1000°C)
Gasoline having an octane number of 90 can be produced by alkylation process

Discuss Question

Answer: Option C. -> All the alkylation processes use very high temperature (> 1000°C)
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1619. Pick out the wrong statement?

Higher temperature is employed in visbreaking than in thermal cracking
Pyrolysis is a mild thermal cracking process
Lead susceptibility of petrol produced by catalytic process is more than that produced by thermal cracking
Operating pressure and temperature in thermal cracking process is more than that in catalytic cracking process

Discuss Question

Answer: Option A. -> Higher temperature is employed in visbreaking than in thermal cracking
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1620. Pick out the wrong statement ?

A pale color of petroleum product indicates lower viscosity
Color of petroleum products indicates the degree of refinement
Lighter petroleum distillates are lighter in color than the heavier residual oils
Fluorescence of oils helps to detect its adulteration

Discuss Question

Answer: Option A. -> A pale color of petroleum product indicates lower viscosity
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!