Engineering Materials - Study Mode

[#61] The percentage of carbon in grey iron castings usually varies between
Correct Answer

(C) 2.5 to 4.5%

Explanation

Solution: Most cast irons have a chemical composition of 2.5 - 4.0% carbon, 1 - 3% silicon, and the remainder iron. Grey cast iron has less tensile strength and shock resistance than steel, but its compressive strength is comparable to low- and medium-carbon steel.

[#62] Dye penetrant method is generally used to locate
Correct Answer

(B) Surface defects

Explanation

Solution: Dye penetrant inspection is a widely applied and low-cost inspection method used to check surface-breaking defects in all non-porous materials (metals, plastics or ceramics).

[#63] The material widely used for making pendulums of clocks is
Correct Answer

(D) Nickel steel

Explanation

Solution: The material widely used for making pendulums of clocks is Nickel steel. Nickel enhances important properties of stainless steel such as formability, weldability and ductility, while increasing corrosion resistance in certain applications.

[#64] Taps dies and drills contain carbon
Correct Answer

(C) Above 1%

Explanation

Solution: Taps dies and drills contain carbon Above 1%

[#65] Solder is an alloy consisting of
Correct Answer

(C) Tin and lead

Explanation

Solution: Solder is a fusible metal alloy used to join together metal workpieces, typically in electronics and plumbing applications. The most common type of solder is made from a combination of tin (Sn) and lead (Pb) . Tin provides good wettability, allowing the solder to flow easily and bond with the base metals. Lead lowers the melting point of the alloy, making it easier to melt and apply during soldering. Typical solder compositions include 60% tin and 40% lead (60/40 solder), or 63% tin and 37% lead (eutectic solder). Therefore, the correct answer is: Tin and lead.