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 36 of 41
- A. Deep drawing
- B. Rolling
- C. Extrusion
- D. Wire drawing
Explanation: Earing is the formation of uneven, ear-like projections around the rim of a drawn cup, caused mainly by sheet anisotropy during deep…
Correct answer: Deep drawing- A. Progress of work performed
- B. Sequence of operation to be performed
- C. Authorisation of work to be performed
- D. Balancing of load on machines
Explanation: Routing establishes the path of manufacture by specifying the sequence of operations, machines and work centres through which a job must…
Correct answer: Sequence of operation to be performed- A. Slush
- B. Die
- C. True centrifugal
- D. Investment
Explanation: In true centrifugal casting, molten metal is poured into a rotating mould and centrifugal force produces sound cylindrical products such…
Correct answer: True centrifugal- A. Direct arc
- B. Induction
- C. Resistance
- D. Indirect arc
Explanation: Indirect-arc furnaces are commonly used for non-ferrous metals because the arc heats the charge indirectly and reduces contamination from…
Correct answer: Indirect arc- A. Hydrostatic
- B. Hydrodynamic
- C. Boundary
- D. Mixed/semi-fluid
Explanation: Hydrostatic lubrication supplies the pressurised lubricant film externally, even before the surfaces begin moving, so starting friction is…
Correct answer: Hydrostatic- A. Water
- B. Steam
- C. Nitrogen
- D. Foam
Explanation: Nitrogen extinguishes a large fuel-gas-line fire by diluting and inerting the gas-air mixture, while also reducing the oxygen…
Correct answer: Nitrogen- A. 1000-1100
- B. 400-500
- C. 650-800
- D. 150-300
Explanation: Ordinary soft soldering uses low-melting alloys and is generally carried out at about 150–300°C.
Correct answer: 150-300- A. Formability
- B. Yield strength
- C. Toughness
- D. Resilience
Explanation: Automobile body sheets must undergo deep drawing and shaping without cracking, making formability the key property.
Correct answer: Formability- A. Make the plate softer
- B. Prevent cold cracks
- C. Avoid plate distortion
- D. Burn oil & grease sticking to plate surfaces
Explanation: Preheating slows the cooling rate of the weld and reduces the formation of hard, brittle structures and hydrogen-induced cold cracks.
Correct answer: Prevent cold cracks- A. Liquid iron
- B. Solid iron
- C. Sponge iron
- D. Iron saturated with carbon
Explanation: Direct reduction removes oxygen from iron ore in the solid state, so the product remains porous solid iron known as sponge iron.
Correct answer: Sponge iron- A. Vapour locking
- B. Hot starting
- C. All A, B & C
- D. Spark plug fouling
Explanation: Front-end volatility mainly influences vapour locking and hot starting because the most volatile components vaporise readily.
Correct answer: Spark plug fouling- A. Blades of gas turbine
- B. Piston of an I. C. engine
- C. Flywheel of steam engine
- D. Cycle chain
Explanation: Gas-turbine blades operate under high temperature and sustained stress, conditions that cause time-dependent creep deformation.
Correct answer: Blades of gas turbine- A. High brittleness
- B. Higher tendency to distort
- C. High ductility
- D. None of these
Explanation: Refining the grain size generally improves steel strength and toughness and commonly gives good ductility compared with coarse-grained…
Correct answer: High ductility- A. 110
- B. 85
- C. 60
- D. 45
Explanation: An industrial noise exposure limit of about 85 dB is the commonly used international occupational-safety reference for an eight-hour…
Correct answer: 85- 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 tool720. 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