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Which of the following is/are the applications of Duriron because of its corrosion resistance and inherent hardness?

Which of the following is/are the applications of Duriron because of its corrosion resistance and inherent hardness? Correct Answer To manufacture pumps, valves, fans, heat exchangers and impressed-current anodes

Duriron is high-silicon cast iron with high corrosion resistance and inherent hardness. It is used to manufacture pumps, valves, fans, heat exchangers, and impressed-current anodes.

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Duriron exhibits excellent corrosion resistance in concentrations over 45% at temperatures including boiling.
The corrosion resistance of Durichlor to nitric acid is better than that of Duriron.
Duriron has better corrosion resistance than Durichlor in hydrochloric acid.
Consider the following statements regarding corrosion of ceramic material: 1. Ceramic materials are much better suited to withstand most of these environments for reasonable time periods than are metals. 2. Corrosion of ceramic materials generally involves simple chemical dissolution, in contrast to the electrochemical processes found in metals. 3. Ceramic materials are not frequently used because of their non-resistance to corrosion. Which of the above statements is/are correct?
Corrosion of less corrosion-resistant metal is usually increased and the attack of the more corrosion-resistant is decreased in galvanic corrosion.
Directions : In each of the following questions a statement is given, followed by two conclusions. Give answer : Statements : Applications of applicants who do no fulfil eligibility criteria and/or who do not submit applications before last date will be summarily rejected and will not be called for the written test. Conclusions : I. Those who are called for the written test are those who fulfil eligibility criteria and have submitted their applications before last date. II. Written test will be held only after scrutiny of applications.
Directions : In each of the following questions a statement is given, followed by two conclusions. Give answer :

Statements : Applications of applicants who do no fulfil eligibility criteria and/or who do not submit applications before last date will be summarily rejected and will not be called for the written test.

Conclusions :
I. Those who are called for the written test are those who fulfil eligibility criteria and have submitted their applications before last date.
II. Written test will be held only after scrutiny of applications.
Which of the following corrosion form is considered as the intermediate stage between uniform corrosion and complete corrosion resistance?