10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
These 10 free C-302 questions are organized by exam domain, so you can see how each part of the Laser Shaft Alignment 1 (C-302) blueprint is tested. Reveal the answer and explanation under each question.
Before removing a process pump's coupling guard for alignment, an authorized technician locks out the motor disconnect. The process piping has not been isolated, a gauge shows trapped discharge pressure, and reverse flow could turn the coupled shafts. What must be done before alignment work proceeds?
Correct answer: B - Isolate the process energy, safely relieve stored pressure, and verify control.
During rough alignment, a motor shaft is parallel to the pump shaft but sits 0.6 mm to the left when viewed from the motor toward the pump. Vertical position is satisfactory. Lateral jack bolts are fitted at the motor's front and rear feet, and the hold-down bolts have been loosened enough for controlled movement. How should the motor be repositioned?
Correct answer: D - Release the opposing jacks and move both motor ends right by the same amount.
An apprentice adjusts only the laser aiming screws until the beam is centered on the detector at the 12 o'clock position. Neither machine has moved. The apprentice says, 'The shafts are aligned now.' What has actually been established?
Correct answer: B - The optics are aimed; shaft offset and angularity have not yet been established.
A compact motor leaves no exposed shaft between its bearing housing and coupling hub. The clean, rigidly secured metal hub has room for an approved laser bracket, and the beam path will remain clear during the required hand rotation. What is the appropriate mounting choice?
Correct answer: A - Mount the bracket on the solid coupling hub.
A motor's right-front foot shows 0.16 mm of movement during a laser soft-foot check. With the other three foot bolts tight, a feeler gauge finds a gap that widens from almost zero at one edge to 0.15 mm at the opposite edge. The contact surfaces are clean, and external loads have been relieved. Why would simply inserting a uniform 0.15 mm shim be the wrong correction?
Correct answer: C - Angular soft foot requires a correction that accommodates the tapered contact gap.
A replacement motor has a longer distance between its front and rear feet. The technician reuses the old motor's saved setup, updating the sensor spacing but not the foot dimensions. Fresh coupling readings repeat closely. Before relying on the displayed foot corrections, the technician should:
Correct answer: C - Measure and enter the replacement motor's actual foot geometry.
The laser's vertical correction screen calls for lowering the front pair of motor feet by 8 mils and raising the rear pair by 4 mils. Each front foot currently has 0.020 inch of shims; each rear foot has 0.014 inch. Soft foot has been corrected. The technician will replace the shim packs rather than add loose shims. Which total thickness belongs under each foot?
Correct answer: D - Front: 0.012 inch; rear: 0.018 inch.
A dual-sensor motor-to-gearbox alignment gives inconsistent results after the operator overshoots a measurement position and reverses the motor shaft. The coupling has slight rotational play: the motor-side sensor turns before the gearbox-side sensor follows. The measurement mode requires both shafts to rotate together. Which change will improve measurement consistency?
Correct answer: D - Keep the coupling play taken up in one direction and rotate both shafts together.
For a pump operating at 2,950 rpm, the manufacturer's installation limits are 0.05 mm offset and 0.04 mm angularity per 100 mm, in each plane. The final readings are: vertical offset 0.02 mm; vertical angularity 0.02 mm/100 mm; horizontal offset 0.03 mm; horizontal angularity 0.07 mm/100 mm. The remaining alignment error calls for:
Correct answer: A - Correcting horizontal angularity by moving the two motor ends different lateral amounts.
A pump and motor meet their alignment limits with the process piping disconnected. The piping is then connected while depressurized and independently supported. Shaft position changes repeatably as the last flange bolts are tightened; loosening those bolts restores the earlier laser readings. The foundation and sensor mounts do not move. Where should the correction be directed?
Correct answer: A - At the pipe fit-up and supports, so the flange connection does not pull the pump.
The full bank has 1,020 more C-302 questions with explanations.
Continue in the free practice test →
View plans