Bissoy.com
Doctors Medicines MCQs Q&A

Iron is corroding at a current density of 1.69*10-4 amp/cm2. What would be the corrosion rate in MDD?

Iron is corroding at a current density of 1.69*10-4 amp/cm2. What would be the corrosion rate in MDD? Correct Answer 423

We know MDD = W/At = (I*am) / (n*F). We should convert the given unit values in milligrams/sq. Decimeter/day. Given, I = 1.69*10-4 amp/cm2 Atomic weight of iron = am = 55.86 g/mol n = number of electrons = 2 F = faraday’s constant = 96500 coulombs = (1.96×10-4 coulombs/sec*cm2) × (55.86) ÷ (2×96500 coulombs) = / = 422.53 MDD.

Related Questions

OMC-SP and MDD-SP denote the optimum moisture content and maximum dry density obtained from standard Proctor compaction test, respectively. OMC-MP and MDD-MP denote the optimum moisture content and maximum dry density obtained from the modified Proctor compaction test, respectively. Which one of the following is correct?
Iron is corroding at a current density of 1.69*10-4 amp/cm2. What would be the corrosion rate in MPY?
Calculate the corrosion penetration rate of iron that corroding at an electrochemical corrosion rate of 1 microampere/sq. centimeters?
An object X sinks in liquids P and Q but floats in liquid R. Which of the following conclusions can be made from these observations? A) Density of X is more than the density of P B) Density of X is less than the density of R C) Density of P is equal to the density of R D) Density of P is less than the density of R
Which following expression is used to find the corrosion rate from current density of a corroding specimen? b) W/At = c) W/At = d) W/At = and W/At =
Which of the following are not chemical changes? 1. Tempering of iron 2. Conversion of the iron piece into an electro-magnet by passing the current around the iron 3. Melting of iron 4. Rusting of iron Select the correct answer using the code given below:
Which of the following statements are true/false?
1. A minimum rate of wages for the time spent by employees for the production of output is minimum time rate.
2. Minimum piece rate is the rate based on the quantity of the output employees have produced.
3. The guaranteed time rate is a minimum rate of remuneration to apply in the case of employees employed on piece work for the purpose of securing to such employees a minimum rate of wages on a time work basis.
4. A minimum rate of remuneration to apply in the case of employees employed on piece work for the purpose of securing to such employees a minimum rate of wages on a time work basis is overtime rate.
Which of the following statements are correct? 1. Steel and cast iron are multi-phase alloys. 2. Ferrite is a single phase interstitial solid solution of carbon in iron. 3. Wrought iron is a highly refined iron with a small amount of slag which gives resistance to progressive corrosion. 4. Stellite contains large amounts of metals like cobalt and tungsten resulting in high hardness. Select the correct answer using the code given below.
Corrosion of less corrosion-resistant metal is usually increased and the attack of the more corrosion-resistant is decreased in galvanic corrosion.
Corrosion rate can not be lowered by reducing the __________ of the corroding medium.