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 ______
• b) millimeters/sq. decimeter/day
• c) milligrams/sq. decimeter/day
Q.4
• 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
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
• a) True
• b) False
Q.9
• a) 773
• b) 723
• c) 423
• d) 473
Q.10
• 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
• 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