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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2,710 questions · page 136 of 136
- A. Glass
- B. Lead
- C. Zinc
- D. Tin
Explanation: Glass is amorphous because its atoms lack the long-range periodic arrangement found in crystalline metals such as tin, lead and zinc.
Correct answer: Glass- A. 6 : 1
- B. 12 : 1
- C. 18 : 1
- D. 24 : 1
Explanation: A spark-ignition engine develops maximum power with a fuel-rich mixture, commonly at an air-fuel ratio near 12:1.
Correct answer: 12 : 1- A. Crystallise faster
- B. Resist greater tensile stress at room temperature
- C. Have higher melting temperature
- D. Are better conductor of electricity at higher temperature
Explanation: Ceramics are held together by strong ionic or covalent bonds, giving them generally higher melting temperatures than metallic materials.
Correct answer: Have higher melting temperature- A. Heavy
- B. Structural
- C. Process
- D. Electronic
Explanation: Laser welding produces a narrow, precise weld with a small heat-affected zone, making it especially useful for delicate electronic…
Correct answer: Electronic- A. Microwaves
- B. X-rays
- C. Gamma rays
- D. Gas welding
Explanation: Microwave welding is suitable for joining very thin foils because it can provide localized heating with limited distortion of the thin…
Correct answer: Microwaves- A. 0.03
- B. 0.3
- C. 0.8
- D. 1.5
Explanation: A cupola typically consumes about 0.3 ton of coke per ton of cast iron produced, although the exact amount varies with furnace operation…
Correct answer: 0.32707. Satellites burn off during re-entry to earth's atmosphere, because of the ____________________?
- A. Combustion with air
- B. Gravitational pull by earth
- C. Loss in weight of the satellite
- D. Friction with earth's atmosphere
Explanation: During atmospheric re-entry, the satellite encounters air at very high relative velocity, producing intense aerodynamic heating through…
Correct answer: Friction with earth's atmosphere2708. With increase in temperature, the electrical conductivity of semiconductors_____________________?
- A. Increases
- B. Decreases
- C. Remain constant
- D. Either A. or B. depends on the type of semi-conductor
Explanation: Heating a semiconductor generates additional electron-hole charge carriers, so its electrical conductivity increases with temperature.
Correct answer: Increases- A. Period increases
- B. Both 'B' & 'C'
- C. Group increases
- D. Period decreases
Explanation: Across a period, increasing nuclear charge pulls the electron cloud inward, so atomic size decreases.
Correct answer: Both 'B' & 'C'- A. 768
- B. 908
- C. 1400
- D. 1539
Explanation: The Curie point of iron is approximately 768°C, above which ferromagnetic iron becomes paramagnetic.
Correct answer: 768