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. Silicon
- B. Phosphorous
- C. Carbon
- D. Chromium
Explanation: The yield-point effect in annealed low-carbon steel is caused mainly by interstitial carbon and nitrogen atoms pinning dislocations.
Correct answer: Carbon- A. Brass
- B. Bronze
- C. German silver
- D. Cast iron
Explanation: Cast iron contains substantial carbon and has a brittle structure, so it fractures readily under an impact load.
Correct answer: Cast iron- A. Steel
- B. Stellite
- C. Bronze
- D. Lead
Explanation: Steel shots are widely used in shot blasting because they are hard, durable, and can be reused for many impacts.
Correct answer: Steel- A. Piercing
- B. Spinning
- C. Drawing
- D. Extrusion
Explanation: Hot spinning forms rotationally symmetrical parts by pressing and shaping a heated metal blank against a rotating mandrel.
Correct answer: Spinning- A. Flow rate of molten metal
- B. Specific gravity of a liquid
- C. Composition of alloys
- D. Concentration of a solution
Explanation: A pycnometer holds a precisely known volume, so weighing the empty and filled vessel gives the liquid density and hence its specific…
Correct answer: Specific gravity of a liquid2606. The dimensional formula of bulk modulus of elasticity is same as that of the ____________________?
- A. None of these
- B. Density
- C. Force
- D. Pressure
Explanation: Bulk modulus is volumetric stress divided by volumetric strain, and strain has no dimensions.
Correct answer: Pressure- A. -55°
- B. -40°
- C. -33°
- D. -58°
Explanation: Using F = (9/5)C + 32 and setting the two readings equal gives C = F = -40.
Correct answer: -40°- A. Soft
- B. Hard
- C. Tough
- D. Ductile & malleable
Explanation: Sulphur promotes brittleness in pig iron and generally makes it harder but less ductile and less tough.
Correct answer: Hard- A. C2H2
- B. P2O5
- C. SiCl4
- D. PCl5
Explanation: Silicon tetrachloride, SiCl4, reacts rapidly with atmospheric moisture to produce finely divided silica and hydrogen chloride fumes…
Correct answer: SiCl4- A. 90% tungsten carbide and 10% cobalt
- B. 70% aluminium oxide & 30% silica
- C. 30% nickel, 15% chromium & 55% tungsten
- D. 65% tungsten & 35% zirconium
Explanation: Cemented carbide cutting tools commonly contain about 90% tungsten carbide particles bonded with 10% cobalt, giving high hardness and wear…
Correct answer: 90% tungsten carbide and 10% cobalt2611. Which of the following low melting alloy containing bismuth and lead is used for electric fuse ?
- A. Monel metal
- B. Babbitt metal
- C. Wood's metal
- D. Duralumin
Explanation: Wood's metal is a low-melting bismuth-based alloy containing lead, commonly also tin and cadmium, and is used in fusible plugs and…
Correct answer: Wood's metal- A. 5
- B. 1.25
- C. 2.5
- D. 3.75
Explanation: The loss of weight in water is 5 - 4 = 1 kg, which equals the buoyant force and the weight of displaced water.
Correct answer: 5- A. Pellets
- B. Lumps
- C. Briquettes
- D. Sinter
Explanation: The Midrex direct-reduction process normally feeds iron ore as prepared pellets, which provide good permeability and reduction contact in…
Correct answer: Pellets- A. Without melting the base metal
- B. Both A. & B.
- C. With a non-ferrous filler
- D. Neither A. nor (B)
Explanation: In brazing, the base metals remain solid while a non-ferrous filler metal melts and flows into the joint, so both statements are correct.
Correct answer: Both A. & B.- A. Martenistic
- B. Bainitic
- C. Pearlitic
- D. Ferritic
Explanation: Pearlite consists of alternating lamellae of ferrite and cementite, giving cementite its characteristic layered form.
Correct answer: Pearlitic- A. 140
- B. 180
- C. 240
- D. 280
Explanation: Assuming a linear scale, 0°C corresponds to 100°D and 100°C to 400°D, giving a slope of 3°D per °C.
Correct answer: 2802617. Limestone is added in the blast furnace (during pig iron manufacture) to______________________?
- A. Supply heat by undergoing exothermic reaction with impurities
- B. Form slag by combining with impurities
- C. Reduce the coke consumption
- D. Reduce slag viscosity
Explanation: Limestone decomposes to lime in the furnace, and the lime combines with silica and other gangue impurities to form slag.
Correct answer: Form slag by combining with impurities- A. Zinc
- B. Lead
- C. Nickel
- D. Tin
Explanation: Nickel has a high recrystallization temperature, so room temperature is below the range required for hot working.
Correct answer: Nickel- A. A physical phenomenon
- B. An uncontrollable phenomenon
- C. Same as erosion
- D. A chemical phenomenon
Explanation: Corrosion is the chemical or electrochemical deterioration of a material through reaction with its environment.
Correct answer: A chemical phenomenon- A. All 'A', 'B' & 'C'
- B. Increases its electrical resistivity and decreases the hysteresis loss
- C. Is present upto 5% & 4% respectively when used in transformers & motor armatures
- D. Makes it usable in almost all magnetic circuits where alternating current is used
Explanation: Silicon steel has higher electrical resistivity, which reduces eddy-current losses, and lower hysteresis loss; these properties make it…
Correct answer: All 'A', 'B' & 'C'