Free Plant Design and Economics MCQs with Answers
803 Plant Design and Economics 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.
Last updated
803 questions · page 35 of 41
- A. Forgings like can shaft, structural steel plate, threading dies and drawing dies
- B. Cutlery, screws, rivets and files
- C. Mandrels, twist drills, small lathe tools and razors
- D. Small punches, broaches reamers and springs
Explanation: Carbon steel containing about 0.9 to 1% carbon is high-carbon steel, which provides high hardness and wear resistance for small punches…
Correct answer: Small punches, broaches reamers and springs- A. Ferromagnetic
- B. Semi-conductor
- C. Paramagnetic
- D. Ferroelectric
Explanation: Nickel is ferromagnetic at ordinary temperatures, although it loses ferromagnetism above its Curie temperature.
Correct answer: Ferromagnetic- A. Toughness
- B. Resilience
- C. Ductility
- D. Impact strength
Explanation: Resilience is the ability to absorb elastic strain energy without permanent plastic deformation and release it upon unloading.
Correct answer: Resilience- A. Hand trolley
- B. Crane
- C. Belt conveyor
- D. Truck
Explanation: A belt conveyor follows a fixed route and is unsuitable when the material path must vary.
Correct answer: Belt conveyor- A. 300
- B. 800
- C. 1400
- D. 2000
Explanation: The commonly quoted electricity consumption for producing one tonne of paper in the Indian paper industry is about 1400 kWh.
Correct answer: 1400- A. (Load)3
- B. (Load)2
- C. (Load)1
- D. (Load)0.33
Explanation: For a ball bearing, the basic rating life follows L10 = (C/P)^3, where P is the applied load.
Correct answer: (Load)3- A. Gantt chart
- B. Travel chart
- C. String diagram
- D. Bin chart
Explanation: A travel chart records the quantities of material moved between different workstations, giving a compact basis for evaluating handling…
Correct answer: Travel chart- A. Hardened steel
- B. Tungsten carbide
- C. Boron carbide
- D. Silicon carbide
Explanation: Boron carbide is commonly regarded as the hardest of these engineering materials, with hardness close to that of diamond.
Correct answer: Boron carbide689. _______________ is the most important element, which controls the physical properties of steel ?
- A. Manganese
- B. Silicon
- C. Vanadium
- D. Carbon
Explanation: Carbon has the greatest effect on steel hardness, strength, ductility, and weldability because it changes the steel’s microstructure and…
Correct answer: Carbon- A. Draft
- B. Pattern
- C. Casting
- D. Distortion
Explanation: The small taper provided on pattern surfaces to permit easy withdrawal from the mould is called draft allowance.
Correct answer: Draft- A. Higher, as it gives higher wavelength
- B. Lower, as it gives higher wavelength
- C. Higher, as it gives shorter wavelength
- D. Lower, as it gives shorter wavelength
Explanation: Thicker plates require more penetrating X-rays, obtained by increasing tube voltage.
Correct answer: Higher, as it gives shorter wavelength- A. Mild steel
- B. Concrete
- C. Cast iron
- D. Asbestos cement
Explanation: Lead is traditionally caulked into the socket joints of cast-iron pipes because it seals the joint while allowing slight movement.
Correct answer: Cast iron- A. Gold & silver
- B. Nickel
- C. Aluminium
- D. Copper
Explanation: Aluminium, copper and nickel can form adherent oxide films that protect their surfaces from further oxidation.
Correct answer: Gold & silver- A. Iron
- B. Copper
- C. Steel
- D. Nickel
Explanation: Die casting commonly uses low-melting nonferrous alloys, and copper is the suitable choice among the listed materials.
Correct answer: Copper- A. Nichrome
- B. Kanthal
- C. Invar
- D. None of these
Explanation: Invar is a low-expansion nickel-iron alloy designed for dimensional stability, not for high electrical resistance and heat generation.
Correct answer: Invar- A. 250
- B. 500
- C. 1000
- D. 3000
Explanation: At break-even, fixed cost equals contribution from sales: production = 5000/(30 − 20) = 500 toys per month.
Correct answer: 500- A. Silver grey
- B. Black
- C. Green
- D. Yellow
Explanation: Steam lines are commonly identified with a silver-grey colour because the code associates this colour with steam and hot vapour service.
Correct answer: Silver grey- A. Can't be used in the form of pressure sensitive tapes
- B. None of these
- C. Cure instantaneously after application on a surface
- D. Can't join two dissimilar metals
Explanation: Adhesives can be made as pressure-sensitive tapes and can join dissimilar metals, while most require time or a curing mechanism rather…
Correct answer: None of these- A. Blow down valve
- B. Blow off cock
- C. Safety valve
- D. Fusible plug
Explanation: A fusible plug protects a boiler during low-water conditions by melting when its exposed portion overheats, releasing steam and warning of…
Correct answer: Fusible plug- A. Neoprene
- B. Natural
- C. Butadiene
- D. Nitrile
Explanation: Neoprene has good resistance to weathering, oils and vacuum-service conditions, making it a common choice for vacuum-sealing O-rings among…
Correct answer: Neoprene