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Free download in PDF Engineering Chemistry Short 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.
41
Relative humidity above which atmospheric corrosion rate of metal increases sharply is known as,
[A]
Critical humidity
[B]
Humidity rate
[C]
Environmental humidity
[D]
Atmospheric humidity
Answer: Critical humidity
42
Ratio of volumes of metal oxides to metal is known as,
[A]
Specific mass ratio
[B]
Volume ratio
[C]
Specific ratio
[D]
Specific volume ratio
Answer: Specific volume ratio
43
Paints which are used to restrict corrosion are known as,
[A]
Anticorrosion paints
[B]
Antifouling paints
[C]
Special paints
[D]
Marine paints
Answer: Antifouling paints
44
In waterline corrosion highly oxygenated parts acts as,
[A]
Cathodic
[B]
Anodic
[C]
Corroded
[D]
None of these
45
In differential aeration corrosion, poor oxygenated parts are,
[A]
Anodic
[B]
Cathodic
[C]
Corroded
[D]
None of above
46
Lubricating oil should possess acid value,
[A]
More than 0.1
[B]
0.1
[C]
Less than 0.1
[D]
None of above
47
In pour point apparatus the freezing mixture used is,
[A]
Ice + CaCl2
[B]
Ice + BaCl2
[C]
Ice + MgCl2
[D]
Ice + AlCl3
48
Apparatus used to determine flash and fire points of lubricating oil is known as,
[A]
Bomb calorimeter
[B]
Spectrophotometer
[C]
Redwood viscometer
[D]
Pensky Martin Apparatus
Answer: Pensky Martin Apparatus
49
Redwood viscometer No. 1 is used to determine viscosities of,
[A]
Lubricating Oils
[B]
Thin lubricating oils
[C]
Highly viscous oils
[D]
None of above
Answer: Thin lubricating oils
50
High viscosity standard oil is,
[A]
Blended oil
[B]
Gulf oil
[C]
Pennylsylvanian oil
[D]
Petroleum oil
Answer: Pennylsylvanian oil
51
Low viscosity standard oil is,
[A]
Petroleum oil
[B]
Gulf oil
[C]
Blended oil
[D]
Mineral oil
52
Mo disulphide possesses very low ......
[A]
Coefficient of friction
[B]
Lubricating property
[C]
Frictional resistance
[D]
Conductivity
Answer: Coefficient of friction
53
When graphite is dispersed in water, is called,
[A]
Oil dug
[B]
Aqua dug
[C]
Graphia-water
[D]
None of above
54
To prevent corrosion phenomenon, combination of.....is used,
[A]
Phosphorous or Antimony
[B]
Phosphorous or Chlorine
[C]
Phosphorous or Nitrogen
[D]
Antimony or Sodium
Answer: Phosphorous or Antimony
55
Identify the metal which is not employed as Sacrificial anode,
[A]
Mg
[B]
Zn
[C]
Al
[D]
Na
56
Identify the group which is not used as anodic inhibitor,
[A]
Chromates
[B]
Phosphates
[C]
Sulphates
[D]
Tungstates
57
Oxidation potential of Ni / Ni2+ is,
[A]
+ 0.284 V
[B]
- 0.284 V
[C]
+ 2.284 V
[D]
- 2.284 V
58
From the following, which is inert to oxidation?
[A]
Cu
[B]
Fe
[C]
Steel
[D]
Pt
59
Conversion of Fe to Fe2+ is,
[A]
Oxidation
[B]
Reduction
[C]
Corrosion
[D]
None of above
60
From the following, identify the gas which is not responsible for acid rain.
[A]
SO2
[B]
NO2
[C]
HCl
[D]
Ozone
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