Chemical Engineering Basics - Study Mode

[#366] For the irreversible reaction, C a + 2C = C a C 2 , ΔH°298 = -60000 J.mole -1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be
Correct Answer

(C) 90000 J

[#367] __________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.
Correct Answer

(C) Alumina

[#368] Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are
Correct Answer

(A) Cobalt, chromium & tungsten

[#369] Which of the following welding processes employs the highest welding temperature ?
Correct Answer

(D) Resistance welding

[#370] Which of the following is a boiler accessory i.e., not a boiler mounting ?
Correct Answer

(C) Feed water pump