Galvanic Corrosion MCQs : Here you will find MCQ Questions related to "Galvanic Corrosion" in Corrosion Engineering. These Galvanic Corrosion MCQ Questions Will help you to improve your Corrosion Engineering knowledge and will prepare you for various Examinations like Competitive Exams, Placements, Interviews and other Entrance Exmaniations
Galvanic corrosion also called?
A. bimetallic corrosion
B. dissimilar metal corrosion
C. similar metal corrosion
D. Both A and B
Explanation: Galvanic corrosion also called bimetallic corrosion or dissimilar metal corrosion.
A common example of galvanic corrosion occurs in?
A. galvanized oxygen
B. galvanized iron
C. galvanized water
D. galvanized hydrogen
Explanation: A common example of galvanic corrosion occurs in galvanized iron, a sheet of iron or steel covered with a zinc coating.
The electrochemical potential difference between stainless steel and aluminium is in the range of?
A. 0 to 1.0 V
B. 0.1 to 1.0 V
C. 0.5 to 1.0 V
D. 0.9 to 1.0 V
Explanation: The electrochemical potential difference between stainless steel and aluminium is in the range of 0.5 to 1.0 V, depending on the exact alloys involved, and can cause considerable corrosion within months under unfavorable conditions.
A lasagna cell is accidentally produced when salty moist food such as lasagna is stored in a steel baking pan and is covered with aluminium foil.
C. Can be yes or no
D. Can not say
Explanation: A "lasagna cell" is accidentally produced when salty moist food such as lasagna is stored in a steel baking pan and is covered with aluminium foil.
What is the Anodic index of High brasses and bronzes metal?
Explanation: High brasses and bronzes : −0.45
What is the Anodic index of Zinc metal?
Explanation: Zinc, wrought; zinc-base die-casting alloys; zinc plated : −1.25
Which of the following is the primary characteristic of an electrolyte to form corrosion?
A. Electrical resistivity
B. Thermal resistivity
C. Thermal conductivity
D. Electrical conductivity
Explanation: Electrical conductivity is the primary characteristic of an electrolyte. Electrolyte is a medium to transfer electrons from anode to cathode, this results in corrosion. The conductivity of the electrolyte is one of the main factors in the regulation of corrosion.
What is the abbreviation of EMF?
A. Electromotive force
B. Electromagnetic force
C. Electromotive frequency
D. Electrode motive force
Explanation: EMF is abbreviated as an electromotive force. It is defined as the potential difference between two points (cathode and anode) in a circuit. It is the cause of the flow of current in the circuit.
Define the distance effect regarding galvanic corrosion?
A. Corrosion occurs only at the junction of two metals
B. Corrosion decreases with increase in distance from the junction
C. Corrosion occurs only at the edges of two metals
D. Corrosion increases with increase in distance from the junction
Explanation: The galvanic effect is the potential difference formed between two or more metals at its junction. It decreases on moving away from the junction. Hence corrosion decreases with an increase in distance from the junction.
Define area effect regarding galvanic corrosion?
A. cathodic area * anodic area
B. anodic area/cathodic area
C. cathodic area/anodic area
D. cathodic area + anodic area
Explanation: It is the ratio of cathodic to anodic areas. An unfavorable area ratio with a large cathodic area and small anodic area results in high current density at the anode. The greater the current density at an anodic area the greater the corrosion rate.