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These 10 free C-301 questions are organized by exam domain, so you can see how each part of the Mechanical Power Systems 2 blueprint is tested. Reveal the answer and explanation under each question.
A raised carriage is suspended by the chain being replaced. The drive disconnect is locked out, electrical isolation has been verified, and the motor brake is engaged. Before the mechanic separates the chain, what additional protection is essential?
Correct answer: A - Support the carriage on rated mechanical blocking before opening the chain.
In a coupling overhaul tray are two grooved steel hubs, a serpentine spring-steel element, and a split cover with grease seals. Which coupling is being rebuilt?
Correct answer: A - Grid coupling
A reverse-dial alignment survey has been corrected for bracket sag and converted to shaft-centerline offsets. Relative to the fixed pump shaft, the motor shaft is 0.04 mm high at axial position x = 0 and 0.10 mm high at x = 200 mm. Distance x increases toward the motor; its near and far foot pairs are at x = 400 mm and x = 800 mm. Soft foot is corrected, sufficient removable shims are present, and the target is collinear shafts. Which shim change removes the vertical misalignment?
Correct answer: C - Remove 0.16 mm under each near foot and 0.28 mm under each far foot.
Two technicians check the same stationary V-belt on an isolated drive. Its maintenance card specifies 700-800 N static tension, or 42-50 N deflection force at 10 mm midpoint deflection on the 640 mm span. A correctly configured sonic meter reads 750 N; a calibrated force-deflection tester reads 47 N at 10 mm. How should these results be reconciled?
Correct answer: B - Accept the tension; each reading meets the specification for its measurement method.
While fitting a QD-bushed sheave, a mechanic reaches the specified screw torque with a small, even gap still visible between the bushing flange and sheave. The bushing, shaft fit, key, and screw arrangement are correct, and the assembly drawing shows flange clearance. A coworker suggests pulling the flange flush before aligning the grooves. What should the mechanic do?
Correct answer: C - Retain the specified clearance and check groove alignment after final tightening.
Stores offers a replacement for an HTD belt. The proposed belt meets the drive's load and speed requirements and has the same 8 mm pitch, pitch length, and width, but belongs to a different tooth-profile family. Which evidence establishes its tooth-fit compatibility with the existing pulleys?
Correct answer: D - The manufacturer documents compatibility with the existing pulley tooth profile.
Under light measuring tension, a roller chain with a nominal pitch of 19.05 mm measures 388.62 mm from the center of the first pin to the center of the twenty-first pin. The machine's maintenance instruction requires replacement at 1.5% elongation or greater. The take-up can still bring slack within its specified range. Which maintenance decision follows from the measurement?
Correct answer: B - Replace the chain; adjusting slack cannot correct its accumulated pitch wear.
A supplier proposes a lighter-duty roller chain for a low-speed drive. The required design chain pull, with the specified duty allowances already included, is 3.4 kN. The proposed chain's catalog lists a 19 kN minimum tensile strength but only 2.8 kN allowable working load for this application. Its dimensions fit the sprockets. How should this proposal be handled?
Correct answer: D - Reject it because the allowable working load is below the required design pull.
A belt-driven fan loses speed under load even though motor speed remains steady. The correct V-belt section is installed, tension and sheave alignment meet specifications, and the drive is clean. Inspection reveals polished belt bottoms and deep grooves that fail the sheave wear gauge. What accounts for the persistent slipping?
Correct answer: C - Worn grooves let the belts bottom out instead of wedging against the sidewalls.
A newly installed pillow-block bearing is noisy from its first run. Examination finds smooth, permanent raceway indentations at rolling-element spacing, without corrosion or abrasive scoring. During mounting, a sleeve pressed against the outer ring while the inner ring was forced onto an interference-fit shaft. Which damage mechanism best fits this history?
Correct answer: A - True brinelling from mounting force transmitted through the rolling elements.
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