CPT Manufacturing Processes & Assembly 2 — Questions and Answers
Question 1: Which welding process uses a continuous wire electrode fed through a gun and is shielded by an external gas supply?
- SMAW
- GMAW (MIG) (Correct answer)
- GTAW (TIG)
- OAW
Correct answer: GMAW (MIG)
GMAW (MIG) welding uses a continuously fed wire electrode and an external shielding gas such as argon or CO2.
Question 2: In a Kanban production system, a Kanban card primarily signals:
- A quality defect has occurred
- Authorization to produce or move material (Correct answer)
- A machine requires maintenance
- An inspection checkpoint has been reached
Correct answer: Authorization to produce or move material
A Kanban card is a visual signal that authorizes the production or movement of a specific quantity of material to the next process.
Question 3: What is the purpose of a fixture in a manufacturing assembly operation?
- To measure the torque applied to fasteners
- To hold a workpiece in a fixed position during machining or assembly (Correct answer)
- To lubricate moving parts during assembly
- To inspect surface finish after machining
Correct answer: To hold a workpiece in a fixed position during machining or assembly
A fixture securely holds and locates a workpiece in the correct position so operations can be performed consistently and accurately.
Question 4: Which type of casting process forces molten metal into a reusable mold under high pressure?
- Sand casting
- Investment casting
- Die casting (Correct answer)
- Lost-foam casting
Correct answer: Die casting
Die casting injects molten metal into hardened steel dies under high pressure, producing high-volume, near-net-shape parts.
Question 5: On an assembly line, 'cycle time' is best defined as:
- The total time from raw material to finished product
- The time between completion of successive units at a workstation (Correct answer)
- The time required to set up a machine before production begins
- The time a part spends waiting in a queue
Correct answer: The time between completion of successive units at a workstation
Cycle time is the elapsed time between completing one unit and the next at a given workstation, determining line throughput rate.
Question 6: What does 'poka-yoke' refer to in manufacturing?
- A Japanese scheduling technique for minimizing overtime
- An error-proofing mechanism that prevents or detects defects (Correct answer)
- A material handling system using gravity conveyors
- A visual management board for tracking production targets
Correct answer: An error-proofing mechanism that prevents or detects defects
Poka-yoke (mistake-proofing) uses physical or electronic devices to prevent errors from occurring or immediately detect them when they do.
Question 7: Which heat treatment process heats steel above its critical temperature and then quenches it rapidly to increase hardness?
- Annealing
- Normalizing
- Hardening (quenching) (Correct answer)
- Stress relieving
Correct answer: Hardening (quenching)
Hardening involves heating steel above its austenitizing temperature and rapidly quenching it in oil, water, or air to form martensite and increase hardness.
CPT Manufacturing Processes & Assembly 2
Which welding process uses a continuous wire electrode fed through a gun and is shielded by an external gas supply?