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. Chromium
- B. Nickel
- C. Manganese
- D. Molybdenum
Explanation: Manganese, nickel, and chromium are commonly used alloying elements in structural steels, whereas molybdenum is a more specialised…
Correct answer: Molybdenum- A. Covalent
- B. Ionic
- C. Metallic
- D. Vander Waal's
Explanation: Covalent bonds have fixed directional orientations because atoms share electron pairs along specific orbital directions.
Correct answer: Covalent- A. Composition
- B. Both A. & B.
- C. Temperature
- D. Neither A. nor B.
Explanation: Diffusion coefficient varies strongly with temperature through its exponential dependence and also changes with composition because the…
Correct answer: Both A. & B.- A. Face centred cubic (fcc)
- B. Orthorhombic
- C. Body centred cubic (bcc)
- D. Cubic
Explanation: At ordinary temperatures, mild steel consists mainly of ferrite, whose iron atoms have a body-centred cubic lattice.
Correct answer: Body centred cubic (bcc)- A. Welding
- B. Cold working
- C. Forging
- D. Casting
Explanation: Wrought iron is produced as a worked material and is shaped by processes such as forging, rolling, and drawing rather than by casting.
Correct answer: Casting- A. Hypo-eutectoid steel
- B. Cast iron
- C. Hyper-eutectoid steel
- D. Eutectoid steel
Explanation: The eutectoid composition of plain carbon steel is about 0.8% carbon, so an Fe–0.4% C alloy lies below it.
Correct answer: Hypo-eutectoid steel- A. Electrical energy
- B. Energy of high velocity electrons
- C. Chemical energy
- D. Heat generated by friction
Explanation: Thermit welding uses an exothermic chemical reaction, usually aluminium reducing a metal oxide, to produce molten metal and intense heat.
Correct answer: Chemical energy- A. A
- B. l
- C. A2
- D. Both A. & B.
Explanation: For a uniform conductor, resistance is given by R = ρl/A, so it increases with length and decreases with cross-sectional area.
Correct answer: Both A. & B.- A. Diamond
- B. Brine (sea water)
- C. Distilled water
- D. Glass
Explanation: Diamond has a refractive index of about 2.42, much higher than water, seawater and ordinary glass.
Correct answer: Diamond- A. Nuclear fission
- B. A combination of both nuclear fission & fusion
- C. Nuclear fusion
- D. None of these
Explanation: A hydrogen bomb uses a fission reaction to initiate the extremely high temperature needed for hydrogen-isotope fusion, so both processes…
Correct answer: A combination of both nuclear fission & fusion- A. Combustion
- B. Fission
- C. Fusion
- D. None of these
Explanation: The Sun is powered mainly by nuclear fusion, in which hydrogen nuclei combine to form helium and release energy.
Correct answer: Fusion- A. 180°
- B. 212°
- C. 32°
- D. 273°
Explanation: On the Fahrenheit scale, ice point is 32°F and steam point is 212°F, giving a fundamental interval of 212 − 32 = 180 degrees.
Correct answer: 180°- A. Suspension
- B. Solution
- C. Gel
- D. Emulsion
Explanation: Milk contains fat droplets dispersed throughout water, which is a liquid-in-liquid colloidal system called an emulsion.
Correct answer: Emulsion- A. Grey
- B. Malleable
- C. Nodular
- D. Spheroidal
Explanation: Annealing white cast iron decomposes cementite and produces graphite in temper-carbon form, giving malleable cast iron.
Correct answer: Malleable2575. Direct conversion of thermal energy to electrical energy is facilitated by the____________________?
- A. Fuel cells
- B. Photo voltaic cell
- C. Magneto hydrodynamic generator
- D. None of these
Explanation: A magnetohydrodynamic generator converts the thermal energy of a hot, electrically conducting gas directly into electricity through its…
Correct answer: Magneto hydrodynamic generator- A. Finishing cuts
- B. Hard materials
- C. Brittle materials
- D. Ductile material
Explanation: A dense grinding-wheel structure is unsuitable for ductile materials because chips clog its small pores and cause wheel loading.
Correct answer: Ductile material- A. Vaporisation of the fuel is decreased
- B. Fuel supply for ignition is not sufficient
- C. Octane number of fuel is decreased
- D. Pour point of fuel decreases
Explanation: Cold weather reduces the vaporisation of fuel, so less fuel vapour mixes with air for ignition and the engine takes longer to start.
Correct answer: Vaporisation of the fuel is decreased- A. Sensible heat carried away by the flue gases
- B. Heat carried away by steam from the combustion of hydrogen in the fuel
- C. Heat lost by radiation
- D. Heat carried away by the steam from the moisture content of the fuel
Explanation: The gross calorific value includes the heat recovered when water formed from hydrogen combustion condenses, whereas the net value excludes…
Correct answer: Heat carried away by steam from the combustion of hydrogen in the fuel- A. 10-15
- B. 103
- C. 10-3
- D. 1015
Explanation: Semiconductors have conductivities much lower than metals but much higher than insulators, commonly lying around 10^-3 ohm^-1 cm^-1 for…
Correct answer: 10-3- A. 0.5
- B. 1
- C. 1/3
- D. 2.5
Explanation: The balanced combustion reaction is C2H2 + 2.5O2 → 2CO2 + H2O. Therefore, 1 Nm3 of acetylene theoretically requires 2.5 Nm3 of oxygen.
Correct answer: 2.5