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. 2
- B. 4
- C. 6
- D. 8
Explanation: In a face-centred cubic unit cell, eight corner atoms contribute 1 atom in total and six face-centred atoms contribute 3 atoms, giving 4…
Correct answer: 4- A. Produced by adding 10-20% steel to the cupola charge
- B. Both A. and B.
- C. Stronger than cast iron
- D. Neither A. nor B.
Explanation: Semi-steel is made by adding steel scrap, commonly about 10–20%, to the cupola charge.
Correct answer: Both A. and B.- A. Have lower corrosion resistance
- B. Are harder to fabricate
- C. All A., B. and C.
- D. Are less ductile and hence less suitable for cold pressing
Explanation: Ferritic stainless steels generally have lower corrosion resistance, lower ductility and poorer cold-forming ability than austenitic…
Correct answer: All A., B. and C.- A. Fatigue resistance
- B. Tensile strength
- C. All A., B. & C.
- D. Creep resistance
Explanation: Fine grains usually improve strength and fatigue resistance, but they reduce high-temperature creep resistance because the greater…
Correct answer: Creep resistance- A. Grey cast
- B. White cast
- C. Wrought
- D. None of these
Explanation: Gradual cooling allows carbon to separate as graphite, producing the grey appearance of grey cast iron.
Correct answer: Grey cast- A. Acidic refractory
- B. Lead or acid-proof bricks
- C. Karbate
- D. Rubber
Explanation: The wet-process phosphoric-acid reaction is strongly corrosive, so the steel digestor requires a lead or acid-proof brick lining.
Correct answer: Lead or acid-proof bricks- A. 3.8
- B. 5.2
- C. 4.8
- D. 4.3
Explanation: Cast iron contains roughly 2.1–4.3% carbon, with 4.3% representing the eutectic composition and the usual upper value quoted for the…
Correct answer: 4.3- A. 0.5
- B. 2.2
- C. 2.5
- D. 2.8
Explanation: High-carbon steel is conventionally defined as steel containing more than about 0.5% carbon.
Correct answer: 0.5- A. Ash
- B. Volatile matter
- C. Carbon
- D. Moisture
Explanation: Ash consists mainly of dense inorganic mineral matter, so even a modest ash content raises coal's specific gravity markedly.
Correct answer: Ash- A. Free state as graphite
- B. Combined form
- C. Both A. and B.
- D. Neither A. nor B.
Explanation: In ordinary steel, carbon is present mainly in combined form, such as iron carbide or cementite.
Correct answer: Combined form- A. Mass
- B. Momentum
- C. None of these
- D. Energy
Explanation: Lenz's law says that an induced current opposes the change producing it, preventing energy from appearing without an input.
Correct answer: Energy- A. None of these
- B. Specific weight
- C. Kinematic viscosity
- D. Angular velocity
Explanation: Angular velocity has units of inverse time, specific weight has force per volume, and kinematic viscosity has area per time, so none is…
Correct answer: None of these- A. Volume
- B. Mass
- C. Specific weight
- D. None of these
Explanation: Each term has dimensions of energy per unit mass: pressure divided by density, potential-energy term, and kinetic-energy term all reduce…
Correct answer: Mass534. Carborundum used for making crucibles for melting non-ferrous metals is chemically________________?
- A. Crystalline magnesia
- B. Silicon nitride
- C. Silicon carbide
- D. Zirconium sulphate
Explanation: Carborundum is the industrial name for silicon carbide, SiC, a hard, refractory material that withstands the high temperatures used for…
Correct answer: Silicon carbide- A. Refractoriness
- B. Melting point
- C. Expansion during heating
- D. Rate at which a fluid will pass through the pores
Explanation: Permeability describes how readily a fluid can move through the interconnected pores of a brick.
Correct answer: Rate at which a fluid will pass through the pores- A. Wall of coke oven
- B. Hot blast stove
- C. Cupola
- D. Blast furnace
Explanation: Fireclay bricks are used in blast furnaces, hot-blast stoves and cupolas because they withstand high temperatures and slags of suitable…
Correct answer: Wall of coke oven- A. Tridymite
- B. Cristobalite
- C. Quartz
- D. All have the same specific gravity
Explanation: Quartz has the greatest specific gravity, about 2.65, whereas cristobalite and tridymite are lower-density polymorphs of silica.
Correct answer: Quartz- A. Increases with the amount of air entrapped in pores
- B. Decreases with decreases in porosity
- C. Is independent of its porosity and is maximum for insulating bricks
- D. Increases with decrease in porosity
Explanation: Solid refractory material conducts heat much better than the air trapped in its pores, so reducing porosity generally increases thermal…
Correct answer: Increases with decrease in porosity- A. Reduced by the addition of acid oxides
- B. Increased by the addition of acid oxides
- C. Not affected by the addition of acid oxides
- D. Always less than 1000°C
Explanation: Adding acidic oxides to a basic refractory can form lower-melting compounds or eutectics, thereby reducing its fusion temperature.
Correct answer: Reduced by the addition of acid oxides- A. Magnesite
- B. Fireclay
- C. Dolomite
- D. Chrome magnesite
Explanation: Fireclay contains silica and alumina and behaves as an acidic refractory, especially against basic slags.
Correct answer: Fireclay