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.
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803 questions · page 37 of 41
- A. Hot temper
- B. Fatigue
- C. Hot hardness
- D. Creep
Explanation: Hot hardness is the ability of a material to retain its hardness and cutting performance at elevated temperature.
Correct answer: Hot hardness- A. Tool replacement
- B. Idle
- C. Inspection
- D. Waiting
Explanation: Queuing theory studies systems in which items or people wait for service, so its main concern is waiting time.
Correct answer: Waiting- A. Endurance limit
- B. Creep strength
- C. Resilience
- D. Fatigue strength
Explanation: The endurance limit is the maximum cyclic stress a material can withstand for essentially unlimited cycles without fatigue failure.
Correct answer: Endurance limit- A. Elastic limit
- B. Endurance limit
- C. Young's modulus
- D. Ultimate tensile strength
Explanation: Fatigue resistance is determined from the endurance limit, which represents resistance to repeated or alternating stresses.
Correct answer: Endurance limit- A. Half
- B. One third
- C. One and half times
- D. One fourth
Explanation: For steel, the ultimate shear strength is commonly about 0.6 to 0.67 of the ultimate tensile strength.
Correct answer: One and half times- A. 0.5
- B. 2
- C. √2
- D. √3/2
Explanation: Under the maximum shear stress, or Tresca, criterion, yielding begins when the maximum shear stress reaches half the uniaxial tensile…
Correct answer: 0.5- A. Electrochemical deposition
- B. Atomisation
- C. Gaseous reduction
- D. Mechanical attrition
Explanation: Atomisation breaks a molten alloy stream into droplets, which solidify into nearly spherical powder particles because surface tension…
Correct answer: Atomisation- A. Boring
- B. Counter boring
- C. Drilling
- D. Enlarging
Explanation: A jig locates and guides the cutting tool, which is especially characteristic of drilling operations.
Correct answer: Drilling- A. Full annealing
- B. Bright annealing
- C. None of these
- D. Patenting
Explanation: Patenting is the controlled heat treatment used for high-carbon steel wire, commonly above about 0.25% carbon, to obtain a fine pearlitic…
Correct answer: Patenting- A. Production schedule
- B. Inventory control
- C. Sales forecasting
- D. Quality control
Explanation: A Gantt chart displays activities against time, showing their sequence, duration, overlap and progress.
Correct answer: Production schedule- A. Less
- B. More
- C. Same
- D. More but less than the diameter of bolt
Explanation: A washer spreads the nut load over a larger bearing area, so its outside diameter must be greater than the nut's bearing dimension.
Correct answer: More- A. Steel plant
- B. Coke oven battery
- C. Petroleum refinery
- D. Textile factory
Explanation: Textile processing benefits from humid air because moisture reduces static electricity and helps prevent yarn fibres from becoming brittle…
Correct answer: Textile factory- A. 1
- B. 10
- C. 30
- D. 50
Explanation: An economiser preheats boiler feedwater using waste heat from flue gases, commonly reducing the fuel required for steam generation by…
Correct answer: 10- A. Angle
- B. Flatness
- C. Rotor balancing
- D. Roughness
Explanation: An autocollimator detects very small angular deviations by reflecting a collimated beam from a mirror.
Correct answer: Angle- A. Profit maximisation
- B. Customer satisfaction
- C. Cost reduction
- D. Process improvement
Explanation: Value engineering seeks the required function at the lowest total cost while preserving quality and performance.
Correct answer: Customer satisfaction- A. Brazing
- B. Welding
- C. Soldering
- D. Riveting
Explanation: Soldering uses a low-melting filler metal and does not melt or strongly fuse the base materials, so the joint is weaker than brazed…
Correct answer: Soldering- A. Grouting
- B. Eyebolt
- C. Refractory castables
- D. Anchor bolts
Explanation: Anchor bolts secure the base plates of steel columns to the concrete foundation and resist uplift and lateral movement.
Correct answer: Anchor bolts- A. Abrasion resistant
- B. Corrosion resistant
- C. Prone to season cracking
- D. Machinable
Explanation: Copper-rich alloys are generally resistant to atmospheric and many aqueous corrosive environments because copper forms a protective…
Correct answer: Corrosion resistant- A. Lap joint
- B. Either A. or B.
- C. Butt joint
- D. Neither A. nor B.
Explanation: A butt-riveted joint brings the plates into line and avoids the eccentric loading associated with overlapping plates in a lap joint.
Correct answer: Butt joint- A. 0.5
- B. 3
- C. 10
- D. 25
Explanation: Ultrasonic welding is normally used for thin sheets and components, with a practical maximum thickness of about 3 mm for the materials and…
Correct answer: 3