PlacementPrepWhich casting process uses a wax pattern that is melted out?
Solution
It is also called lost-wax casting and gives fine detail.
Answer: (C) Investment casting
Technical · Mechanical Engineering
Manufacturing Processes MCQs for placement tests
20 technical questions of moderate difficulty, as asked in campus placement and company tests. Each has a short explanation.
Pipes are commonly made by which casting process?
Solution
Spinning the mould throws metal against the walls.
Answer: (D) Centrifugal casting
The allowance given on a pattern for contraction of metal on cooling is:
Solution
Patterns are made slightly larger to allow for shrinkage.
Answer: (A) Shrinkage allowance
Draft is provided on patterns to:
Solution
A slight taper on vertical faces eases withdrawal.
Answer: (B) Make it easier to remove the pattern from the mould
Which welding process uses a non-consumable tungsten electrode?
Solution
TIG (GTAW) uses a tungsten electrode and inert gas.
Answer: (D) TIG welding
In oxy-acetylene welding, the hottest flame is the:
Solution
Excess oxygen gives the highest temperature.
Answer: (D) Oxidising flame
Which machine tool is mainly used to produce cylindrical surfaces?
Solution
The workpiece rotates against a stationary tool.
Answer: (B) Lathe
Which operation enlarges an existing hole using a single-point tool?
Solution
Reaming finishes a hole; tapping cuts threads.
Answer: (C) Boring
Tool life is described by Taylor's equation:
Solution
V is cutting speed and T is tool life.
Answer: (A) VTⁿ = C
Which tool material has the highest hot hardness?
Solution
Ceramics retain hardness at very high temperatures.
Answer: (D) Ceramic
Which process forms metal by forcing it through a die opening?
Solution
Extrusion produces long products with a constant cross-section.
Answer: (C) Extrusion
Hot working of metals is done:
Solution
Cold working is done below the recrystallisation temperature.
Answer: (A) Above the recrystallisation temperature
Which non-traditional process removes material using electric sparks?
Solution
EDM erodes conductive material by spark discharges.
Answer: (C) Electrical discharge machining (EDM)
Which process is best for producing a very smooth, accurate finish on a hardened surface?
Solution
Grinding uses an abrasive wheel for fine finish and tight tolerances.
Answer: (A) Grinding
In a lathe, the term 'feed' refers to:
Solution
Feed is usually in mm per revolution.
Answer: (D) Distance the tool moves per revolution of the work
A jig differs from a fixture because a jig:
Solution
Jigs guide drills; fixtures only locate and hold the work.
Answer: (A) Also guides the cutting tool
Which instrument measures to an accuracy of 0.01 mm?
Solution
A standard micrometer reads to 0.01 mm.
Answer: (D) Micrometer
Soldering differs from welding because in soldering:
Solution
A low-melting filler joins the parts.
Answer: (C) The base metals do not melt
CNC stands for:
Solution
Machine movements are controlled by a program.
Answer: (B) Computer Numerical Control
Which forming process makes seamless tubes by piercing a heated billet?
Solution
Rolls and a mandrel pierce the billet to form a tube.
Answer: (D) Piercing (Mannesmann process)
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