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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
View Answer
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
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Answer: Specific volume ratio
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43
Paints which are used to restrict corrosion are known as,
A
Anticorrosion paints
B
Antifouling paints
C
Special paints
D
Marine paints
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Answer: Antifouling paints
44
In waterline corrosion highly oxygenated parts acts as,
A
Cathodic
B
Anodic
C
Corroded
D
None of these
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45
In differential aeration corrosion, poor oxygenated parts are,
A
Anodic
B
Cathodic
C
Corroded
D
None of above
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46
Lubricating oil should possess acid value,
A
More than 0.1
B
0.1
C
Less than 0.1
D
None of above
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47
In pour point apparatus the freezing mixture used is,
A
Ice + CaCl2
B
Ice + BaCl2
C
Ice + MgCl2
D
Ice + AlCl3
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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
View Answer
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
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Answer: Thin lubricating oils
50
High viscosity standard oil is,
A
Blended oil
B
Gulf oil
C
Pennylsylvanian oil
D
Petroleum oil
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Answer: Pennylsylvanian oil
51
Low viscosity standard oil is,
A
Petroleum oil
B
Gulf oil
C
Blended oil
D
Mineral oil
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52
Mo disulphide possesses very low ......
A
Coefficient of friction
B
Lubricating property
C
Frictional resistance
D
Conductivity
View Answer
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
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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
View Answer
Answer: Phosphorous or Antimony
55
Identify the metal which is not employed as Sacrificial anode,
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56
Identify the group which is not used as anodic inhibitor,
A
Chromates
B
Phosphates
C
Sulphates
D
Tungstates
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57
Oxidation potential of Ni / Ni2+ is,
A
+ 0.284 V
B
- 0.284 V
C
+ 2.284 V
D
- 2.284 V
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58
From the following, which is inert to oxidation?
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59
Conversion of Fe to Fe2+ is,
A
Oxidation
B
Reduction
C
Corrosion
D
None of above
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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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