151. Rotary driers are generally made of
Cast iron
Mild steel
High silicon iron (14% Si)
Tin lined with refractory bricks
✅ The correct answer is option B.
Materials and Construction MCQs
152. A material is able to retain the deformation permanently by virtue of its
Elasticity
Plasticity
Ductility
Malleability
✅ The correct answer is option B.
153. Presence of 0.3 to 0.5% arsenic in copper increases its
Ductility
Malleability
Tenacity & hardness
Electrical conductivity
✅ The correct answer is option C.
154. The ability of a material to absorb energy in the elastic range is a measure of its
Toughness
Resilience
Malleability
Brittleness
✅ The correct answer is option B.
155. Cast irons are generally specified by their
Carbon content
Tensile strength
Hardness
Manufacturing proces
✅ The correct answer is option B.
156. Metal at the top of the electromotive series is
Least active
Most stable
Most active
Most noble
✅ The correct answer is option C.
157. Post weld heat treatment is done by
Normalising
Stress relieving
Tempering
Solution annealing
✅ The correct answer is option B.
158. The most resistant material to alkaline corrosion is
Duriron
Nickel
Aluminium
Karbate
✅ The correct answer is option B.
159. High carbon steel contains more than __________ percent carbon.
0.5
2.2
2.5
2.8
✅ The correct answer is option A.
160. For spinning viscose rayon, the extrusion spinnerettes are made of
Platinum or gold alloys
High carbon steel
Aluminium
Nickel
✅ The correct answer is option A.