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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
View Answer
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
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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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