Q.1
What is meant by MPY in corrosion?
  • a) Mils penetration per year
  • b) Meter penetration per year
  • c) Milli meter penetration per year
  • d) Micro meter penetration per year
Q.2
Which of the following expression is used to calculate MPY?
  • a) MPY=(543*W)/DAT
  • b) MPY=(534*W)/DAT
  • c) MPY=W/DAT
  • d) MPY=DAT/(534*W)
Q.3
MDD in corrosion is abbreviated as ______
  • a) milligrams/sq. decimeter/decade
  • b) millimeters/sq. decimeter/day
  • c) milligrams/sq. decimeter/day
  • d) microns/decimeter/decade
Q.4
MPY is used to measure weight loss per unit area.
  • a) True
  • b) False
Q.5
_____ is/are used to measure the extent of pitting corrosion.
  • a) MPY
  • b) MDD
  • c) Both MPY and MDD
  • d) MPK
Q.6
Which of the following law is used to derive the corrosion rate expression?
  • a) Newton’s law
  • b) Henry’s law
  • c) Raoult’s law
  • d) Faraday’s law
Q.7
Which following expression is used to find the corrosion rate from current density of a corroding specimen?
  • a) W/At = [(I × am) / (n × F)]
  • b) W/At = [(I × am) / (n × d × F)]
  • c) W/At = [534 × (I × am) / (n × F)]
  • d) W/At = [(I × am) / (n × F)] and W/At = [(I × am) / (d × n × F)]
Q.8
Rate of oxidation is equals to the rate of reduction in corrosion.
  • a) True
  • b) False
Q.9
Iron is corroding at a current density of 1.69*10-4 amp/cmWhat would be the corrosion rate in MDD?
  • a) 773
  • b) 723
  • c) 423
  • d) 473
Q.10
Iron is corroding at a current density of 1.69*10-4 amp/cmWhat would be the corrosion rate in MPY?
  • a) 423
  • b) 77
  • c) 473
  • d) 97
Q.11
_____ is used to measure the extent of uniform corrosion.
  • a) MDD
  • b) MPY
  • c) Both MPY and MDD
  • d) MPE
Q.12
Corrosion rate of aluminum is _________ when compared with corrosion of mild steel in open oxygenated atmosphere.
  • a) small
  • b) medium
  • c) large
  • d) very small
Q.13
___________ will occur, if current pass from an electrode to electrolyte.
  • a) Oxidation
  • b) Reduction
  • c) Oxidation and reduction
  • d) Anion formation
Q.14
Oxidizing impurities in electrolyte increases the corrosion rate.
  • a) True
  • b) False
Q.15
What are the uses of corrosion rate estimation of materials in daily life?
  • a) To predict the life time of a component
  • b) To compare the corrosive-resistant of materials
  • c) To increases the corrosion rate
  • d) To predict the life time and to compare the corrosive resistant of materials
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