Question

The manganese content in cast iron should be kept below __________

(a) 0.75%

(b) 1%

(c) 1.5%

(d) 1.75%

The question was asked during an interview for a job.

This key question is from Ferrous Metals in portion Air Conditioning, Thermal Insulation, Stones & Ferrous Metals of Construction & Building Materials

Answer 1

Correct answer is (a) 0.75%

Easiest explanation: Presence of manganese makes cast iron hard and brittle. Therefore, manganese content in cast iron should be kept below 0.75%.