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These 10 free C-210 questions are organized by exam domain, so you can see how each part of the Mechanical Power Systems I blueprint is tested. Reveal the answer and explanation under each question.
A jammed conveyor has been stopped, its motor disconnect locked out, and electrical isolation verified. A raised counterweight is still supported by the jammed mechanism. The crew is about to loosen the chain to clear the obstruction. Which protection is still missing?
Correct answer: A - A rated mechanical restraint holding the counterweight, verified before work.
An isolated shaft is turned through one full revolution while a securely mounted dial indicator contacts the hub radially. Repeatable readings range from -0.030 mm to +0.050 mm. The assembly drawing permits a maximum radial total indicator runout of 0.060 mm. Which result belongs on the inspection record?
Correct answer: D - 0.080 mm TIR; the assembly fails the limit.
Before measuring a hub, an apprentice sets a dial indicator to zero against a reference surface and repeatedly returns it to that surface. Each time it reads zero. The apprentice calls this a calibration. Which additional check is needed to evaluate accuracy over the intended measuring range?
Correct answer: A - Compare readings against known displacements across the intended working range.
During a motor soft-foot check, loosening one hold-down bolt produces 0.15 mm of foot lift. The clean foot-to-base gap is 0.03 mm at one edge and 0.16 mm at the opposite edge. A coworker proposes adding one flat 0.15 mm shim. What must be addressed before final shaft alignment?
Correct answer: D - The angular soft foot, requiring correction of the nonparallel support surfaces.
Witness marks show that a keyed sprocket has moved along its shaft without rotating relative to it. Inspection finds a sound, correctly fitted parallel key and a loose split-hub clamp screw. The shaft and hub bore are undamaged. Which correction targets the observed movement?
Correct answer: A - Restore the hub's specified axial position and clamp-screw torque.
A replacement ball bearing will be pressed onto its shaft before the pillow-block housing is installed. The inner ring has an interference fit on the shaft. Which press arrangement keeps the mounting force out of the rolling elements?
Correct answer: D - Support the shaft and press a sleeve against the inner ring only.
A jaw coupling will join 14 mm and 19 mm shafts at 3,000 rpm. Operating torque is 8 N·m, and the specified service factor is 1.5. Select for operating torque multiplied by the service factor. All four candidates use an approved insert and fit the available installation space. Which set of permitted bore sizes and ratings satisfies the application?
Correct answer: C - 12-20 mm bores; 15 N·m torque capacity; 3,600 rpm maximum speed.
A conveyor runs normally empty but slows under its usual load while motor speed remains steady. With the drive isolated, a technician confirms correct V-belt section, alignment, and tension. A groove gauge shows excessive sheave wear, and the belt's bottom surface has polished contact marks. Which repair addresses the loss of traction?
Correct answer: B - Replace the worn sheave and restore the specified belt fit and tension.
A motor turns at 1,740 rpm. Its driving sheave has a 75 mm pitch diameter and an 80 mm outside diameter; the driven sheave has a 225 mm pitch diameter and a 235 mm outside diameter. Neglecting slip, which driven-shaft speed should a technician predict?
Correct answer: B - 580 rpm
Two bearing greases are both labeled NLGI 2, but their data sheets list different base-oil viscosities and thickener systems. A technician argues that the matching grade makes them interchangeable. What does the shared NLGI number actually establish?
Correct answer: C - They have the same consistency class, measured by penetration at 25°C.
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