71. A metal rod (Tm 1200°C) and a ceramic rod (Tm 2500°C) have the same diameter

Question

71. A metal rod (Tm 1200°C) and a ceramic rod (Tm 2500°C) have the same diameter and length. They are each subjected to a force of 1000 N at a temperature of 1000°C. the force is sufficient to cause immediate yielding. Which rod will be longer after 1 hour when the force is removed? a. the metal rod b. the ceramic rod c. no thermal effects on both materials d. none of the above 72. Galvanizing is generally done on a. low carbon steels b. cast iron c. non-ferrous metals d. non-metallic parts 73. Which of the following will have least percentage of carbon a. high ductility wires b. connecting rods c. dies and punches d. paper knives 74. Primary bonds are formed by a. intermolecular forces b. interatomic forces c. Vander Waal's forces d. none of the above 75. A polymer which once produced, cannot be softened and worked at elevated temperatures without chemical or structural decomposition is known as a. copolymer b. thermosetting polymer c. condensation polymer d. thermoplastic polymer

Explanation / Answer

The scenario is ceramic vs metal rod. Ceramic has lower yielding capacity as compared to metal rod, because it has more brittleness than a metal rod.

Ans: The Metal Rod

It would be Low Carbon Steel.

Connecting Rod is using medium carbon steel except these all needs high carbon steel . So, Connecting Rod

Ans: C

Thermo Setting polymers are permanent polymers which do not soften once get created

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