111. Evaporators used in caustic soda recovery and production plant are made of
Monel metal
Gun metal
Wood metal
Babbit metal
✅ The correct answer is option A.
Materials and Construction MCQs
112. Heavy duty bearings are usually made of
White metal
Phosphorous bronze
Monel
Zinc
✅ The correct answer is option A.
113. A metallic alloy in general as compared to their pure metal components is
More corrosion resistant
Having higher melting point
Having lower hardness, reactivity and fusibility
Having lower electrical conductivity
✅ The correct answer is option A.
114. Babbit metal used for making bearings should have
High-co-efficient of friction between journal and bearing
Ability to retain lubricant on its surface
Low co-efficient of friction between journal and bearing
Both B & C
✅ The correct answer is option A.
115. Graphite is corroded by
Sulphuric acid (10%)
Sea water
Hydrochloric acid
None of these
✅ The correct answer is option D.
116. The ‘bomb’ in the bomb calorimeter is made of
Molybdenum stainless steel
Mild steel
High silicon iron (14% Si)
Copper
✅ The correct answer is option A.
117. The maximum percentage of chromium that can be added to steel is about
12
18
24
30
✅ The correct answer is option B.
118. Babbit metals used for making bearings are
Tin or lead based alloys
Short of antifrictional properties
Having homogenous microstructure
Yellow metals
✅ The correct answer is option A.
119. Constantan used in thermocouples is an alloy of
Iron & copper
Copper & aluminium
Lead & tin
None of these
✅ The correct answer is option D.
120. Hammers and railway rails are normally made of
Mild steel
Dead mild steel
Medium carbon steel
High carbon steel
✅ The correct answer is option D.