Free Chemical Process Principles MCQs with Answers
2,710 Chemical Process Principles MCQs from Chemical Engineering, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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- A. Tin
- B. Zinc
- C. Aluminium
- D. Copper & nickel
Explanation: Silver is strengthened by adding small amounts of harder metals, especially copper and sometimes nickel, as in silver alloys.
Correct answer: Copper & nickel- A. Malleable
- B. Ductile
- C. Brittle
- D. None of these
Explanation: Malleability is the ability to undergo substantial permanent deformation under compressive stress, allowing a material to be rolled or…
Correct answer: Malleable- A. Kanthal
- B. Constantan
- C. Chromel
- D. German silver
Explanation: The copper-nickel alloy used for this thermocouple composition is called constantan.
Correct answer: Constantan- A. Cu (55%) & Sn (45%)
- B. Fe (80%) & Ni (20%)
- C. Pt (95%) & Rh (10%)
- D. Cu (55%) & Ni (45%)
Explanation: Constantan is a copper-nickel alloy, commonly containing about 55% copper and 45% nickel.
Correct answer: Cu (55%) & Ni (45%)- A. Soft
- B. Hard
- C. Rollable
- D. Brittle
Explanation: Tempering reheats hardened steel below its critical temperature to reduce brittleness and internal stresses, with some loss of hardness.
Correct answer: Soft- A. 95
- B. 99.5
- C. 85
- D. 90
Explanation: Electrical-grade aluminium must be highly pure so that impurities do not significantly increase electrical resistivity; a commonly…
Correct answer: 99.5467. The metals occuring at the lower most position in the electromotive series____________________?
- A. Do not resist corrosion
- B. Are heat insulators
- C. Are very brittle
- D. Resist corrosion very strongly
Explanation: At the noble, lower end of the usual electromotive or electrochemical series, metals have less tendency to lose electrons and are…
Correct answer: Resist corrosion very strongly- A. Toughness
- B. Ductility
- C. Creep
- D. Resilience
Explanation: Toughness is the energy a material absorbs before fracture, including deformation in the plastic region.
Correct answer: Toughness- A. 1.5-2
- B. 12-14
- C. 7-9
- D. 3.5-4.5
Explanation: Austenitic manganese steel, or Hadfield steel, normally contains about 12-14% manganese and is used for crusher jaws because it…
Correct answer: 12-14- A. Chromium and molybdenum
- B. Chromium and aluminium
- C. Molybdenum and nickel
- D. Nickel and chromium
Explanation: Nichrome, also called Chromel in many high-temperature alloy applications, is primarily a nickel-chromium alloy.
Correct answer: Nickel and chromium- A. Do not increase in plasticity with rise in temperature
- B. Allow slip to occur between molecules
- C. Do not take on a permanent set
- D. None of these
Explanation: Thermosetting polymers form permanent cross-links during curing, so they do not soften and flow again when reheated.
Correct answer: Do not increase in plasticity with rise in temperature- A. Tensile strength
- B. Softness & flexibility
- C. Acid resistance
- D. Alkali resistance
Explanation: Plasticisers reduce intermolecular attraction and increase polymer-chain mobility, making the material softer and more flexible.
Correct answer: Softness & flexibility- A. Austenitic stainless steel
- B. Heat resisting steel
- C. Invar
- D. High speed steel
Explanation: Invar is an iron-nickel alloy containing about 36% nickel, noted for its exceptionally low thermal expansion.
Correct answer: Invar- A. Lead
- B. Zinc
- C. Nickel
- D. Tin
Explanation: Bronze is primarily an alloy of copper and tin. Copper-zinc alloys are brass, while nickel and lead form other specialized copper alloys.
Correct answer: Tin- A. High-carbon steel
- B. Mild steel
- C. Wrought iron
- D. Low carbon steel
Explanation: High-carbon steel is difficult to weld because its high carbon content promotes hard, brittle heat-affected zones and cracking.
Correct answer: High-carbon steel- A. Boiler plate steel
- B. Rail steel
- C. Saws for cutting steel
- D. Railway spring steel
Explanation: Steel saws require high hardness and edge retention, so they generally contain more carbon than boiler-plate, rail, or spring steel.
Correct answer: Saws for cutting steel- A. 75° C
- B. 373° K
- C. Room temperature
- D. 150° C
Explanation: Lead has a very low recrystallization temperature, so it can be hot-worked at ordinary room temperature without heating.
Correct answer: Room temperature- A. Mild steel drum
- B. Stainless steel vessel
- C. Cast iron vessel
- D. Masonry well
Explanation: A gobar-gas plant digester is usually a masonry or brick-lined underground well in which anaerobic digestion occurs.
Correct answer: Masonry well- A. A low carbon steel (0.05 to 0.3% carbon)
- B. Highly resistant to corrosion (as much as stainless steel)
- C. A high carbon steel (0.5 to 1.5% carbon)
- D. Very poor in strength & ductility
Explanation: Mild steel is low-carbon steel, commonly containing roughly 0.05 to 0.3% carbon, which gives it good ductility and weldability.
Correct answer: A low carbon steel (0.05 to 0.3% carbon)- A. Toughness
- B. Resilience
- C. Malleability
- D. Brittleness
Explanation: Resilience is the energy a material can absorb and recover within its elastic limit, represented by the area under the elastic portion of…
Correct answer: Resilience