RRB ALP Turner Trade — Solved Practice Question Bank

Q: Which lathe part houses the spindle that holds and rotates the workpiece? Sol: The headstock. Q: Why might a machinist choose carbide tooling over HSS for a high-volume production job? Sol: Carbide retains its cutting edge hardness at much higher temperatures than HSS, allowing significantly higher cutting speeds and longer tool life in continuous production work. Q: What lathe operation produces a textured grip pattern on a workpiece surface? Sol: Knurling.

Q: What is the "lead" of a single-start screw thread equal to? Sol: The pitch — for a single-start thread, lead (axial advance per one full turn) equals the pitch (distance between adjacent thread crests). Q: Which measuring instrument generally gives finer precision — a vernier caliper or a micrometer? Sol: A micrometer (typical Least Count 0.01mm) is generally finer than a standard vernier caliper (typical Least Count 0.02mm). Q: What does high run-out on a dial gauge indicate about a rotating workpiece? Sol: The workpiece is not running true/concentric — it will likely produce an out-of-round or eccentric finished part if machined without correction.