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Free download in PDF Engineering Chemistry Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
To decrease pour point of petroleum oil which is used from following?
[A]
Ether
[B]
Acetone
[C]
Decane
[D]
Phenol
(22)
To increase viscosity index of petroleum oil which one of the following is used?
[A]
Hexanol
[B]
Methanol
[C]
Ethanol
[D]
2-methoxy phenol
(23)
To increase oiliness of petroleum oil following which acid is not used,
[A]
Palmitic acid
[B]
Stearic acid
[C]
Acetic acid
[D]
Oleic acid
(24)
Blended oils can be prepared by mixing petroleum oil with,
[A]
Waxy substance
[B]
Different solvents
[C]
Specific additives
[D]
None of above
Answer: Specific additives
(25)
Solvent refining step in purification of petroleum oil comprises use of solvent,
[A]
Furfural
[B]
Dichloroethyl ether
[C]
Nitrobenzene
[D]
All of above
(26)
In acid refining step which used to purify petroleum oil, comprises removal of excess Conc. H2SO4 with addition of calculated quantity of,
[A]
KOH
[B]
NH4OH
[C]
Ca(OH)2
[D]
NaOH
(27)
Purification of petroleum oil contains following sequence as,
[A]
Dewaxing, solvent refining, acid refining
[B]
Dewaxing, acid refining, solvent refining
[C]
Acid refining, dewaxing, solvent refining
[D]
Solvent refining, acid refining, dewaxing.
Answer: Dewaxing, acid refining, solvent refining
(28)
Shorter the chain of petroleum oil,
[A]
Lower viscosity
[B]
Higher viscosity
[C]
Softer
[D]
None of above.
(29)
Length of hydrocarbon chain in petroleum oils varies between about,
[A]
0 to 12 Carbon atoms
[B]
0 to 50 Carbon atoms
[C]
21 to 30 Carbon atoms
[D]
12 to 50 Carbon atoms
Answer: 12 to 50 Carbon atoms
(30)
Animal and vegetable oils are also used as,
[A]
Oiliness carrier
[B]
Blending agent
[C]
Solvent agent
[D]
Extreme pressure additives
31
Animal and vegetable oils possess,
[A]
Good oiliness
[B]
Poor oiliness
[C]
Optimum oiliness
[D]
None of above
32
Important extreme pressure additives contains functional group from following,
[A]
Chlorides
[B]
Sulphides
[C]
Phosphides
[D]
All of above
33
Special additives added to mineral oils are known as,
[A]
Extreme pressure additives
[B]
Special additives
[C]
Mineral additives
[D]
Lubricating additives
Answer: Extreme pressure additives
34
Coefficient of friction for boundary lubrication is,
[A]
0.5 to 15
[B]
0.005 to 0.05
[C]
0.5 to 0.15
[D]
0.05 to 0.15
35
Coefficient of friction in fluid film or hydrodynamic lubrication is,
[A]
0. 1 to 0.3
[B]
0.01 to 0.03
[C]
0.001 to 0.03
[D]
None of above
36
What type of lubrication is used in delicate machines like watches, sewing machines, etc?
[A]
Fluid film lubrication
[B]
Extreme lubrication
[C]
Boundary lubrication
[D]
Thin film lubrication
Answer: Fluid film lubrication
37
What type of oil is suitable for thick film lubrication?
[A]
Hydrocarbon oil
[B]
Mineral oil
[C]
Polymeric oil
[D]
None of above
38
Antioxidants may be,
[A]
Aromatic
[B]
Phenolic
[C]
Amino compounds
[D]
All of above
39
Main function of soap is,
[A]
Thickening agent
[B]
Soapy agent
[C]
Lathering agent
[D]
Corrosion preventer
40
More active metal used in sacrificial anodic protection method is known as,
[A]
Sacrificial anode
[B]
Sacrificial cathode
[C]
Active anode
[D]
Active cathode
Answer: Sacrificial anode
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