1787. Presence of nitrogen in steel
Makes it brittle
Increases its strength
Increases its hardness
Is desirable
✅ The correct answer is option A.
1790. Cast iron has very high
Compressive strength
Ductility
Shock resistance
Resistance to brittleness
✅ The correct answer is option A.
1793. Which of the following is not a copper based alloy with nickel?
German silver
Monel metal
Inconel
Constantan
✅ The correct answer is option C.
1756. Refined acetic acid storage vessel are made of
Copper
Aluminium
High carbon steel
Nickel
✅ The correct answer is option B.
1758. Which of the following is the hardest?
Cementite
Pearlite
Austenite
Ferrite
✅ The correct answer is option C.
1760. H₂SO₄ (< 50% concentration) is corrosive to
Aluminium, mild steel, stainless steel, concrete & tin
Copper, cast iron & high silicon iron (14% Si)
Rubber (butyl and hard), silicone rubber & teflon
Glass, graphite, porcelain & stoneware
✅ The correct answer is option A.
1762. Ceramic materials fabrication can not be done by
Welding
Slip casting
Extrusion
Plastic pressing
✅ The correct answer is option A.
1764. Bell metal is an alloy of
Copper & zinc
Copper & tin
Copper & nickel
Zinc & tin
✅ The correct answer is option B.
1766. Compressive strength of wood is usually more along the grains. The tenile strength of wood as compared to that of steel is about
Half
One third
One fifth
One twelfth
✅ The correct answer is option C.
1768. Which one contains the least percentage of carbon?
Wrought iron
High speed steel
Cast iron
Pig iron
✅ The correct answer is option A.