All Free Chemical Engineering MCQs with Answers
Every Chemical Engineering question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
6,983 questions · page 333 of 350
6641. Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be ______________ mm?
- A. 10
- B. 20
- C. 30
- D. 40
Explanation: Using the standard boiler-joint rule that the rivet diameter is approximately twice the plate thickness, d = 2(20) = 40 mm.
Correct answer: 40- A. Plate thickness
- B. Electrode size
- C. Voltage across the arc
- D. Welded portion length
Explanation: In arc welding, electrode diameter mainly determines the suitable welding current because a larger electrode requires a higher current to…
Correct answer: Electrode size- A. Induced stresses
- B. Elastic properties
- C. Density
- D. Thermal properties
Explanation: An isotropic material has the same mechanical or elastic response in every direction, so its elastic properties do not depend on the…
Correct answer: Elastic properties- A. Pressure
- B. Thermit
- C. Resistance
- D. Arc
Explanation: Projection welding and stud welding use electrical resistance at the contacting surfaces to generate heat and form the joint.
Correct answer: Resistance- A. Non-ferrous cast alloy cutting tool
- B. Ceramic
- C. Cemented carbide
- D. Ferrous
Explanation: “Satellite” is almost certainly a misspelling of Stellite, a cobalt-based, non-ferrous cast alloy used as a cutting-tool material.
Correct answer: Non-ferrous cast alloy cutting tool6646. Strain hardening effect in metals subjected to cold working is due to the _______________ mechanism?
- A. Slip
- B. Dislocation
- C. Winning
- D. Fracture
Explanation: Cold working increases strength because dislocations multiply and impede one another’s movement, making further plastic deformation…
Correct answer: Dislocation- 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