1.Primary goal of preventive maintenance?
- A.Fix after breakdown
- B.Prevent unexpected breakdowns, extend equipment life✓
- C.Reduce staff
- D.Track warranties
Why: PM prevents unexpected failures through scheduled inspections, lubrication, adjustments, and component replacement.
2.Over-greasing a bearing causes:
- A.Better protection
- B.Excessive heat, premature failure from churning✓
- C.No negative effect
- D.Improved speed
Why: Elements churn excess grease → heat → friction → grease breakdown → blown seals. Follow 1/3 fill rule.
3.During commissioning, verify before startup:
- A.Power connected only
- B.Alignment, lubrication, rotation, safety devices, connections✓
- C.Paint finish only
- D.Nameplate only
Why: Checklist: alignment, fluids filled, rotation direction (bump test), guards, safety devices, connections tight, follow manufacturer procedure.
4.A vibration signature dominated by 1x running speed in the radial direction is most characteristic of:
- A.Misalignment
- B.Unbalance✓
- C.Bearing defects
- D.Electrical looseness in a motor's stator
Why: Simple unbalance produces a clean 1x RPM peak, primarily radial — a classic diagnostic signature.
5.An accelerometer commonly uses which sensing element to generate a vibration signal?
- A.A piezoelectric crystal✓
- B.A magnet and coil
- C.A strain-gauge foil only
- D.A fiber-optic sensor
Why: Piezoelectric accelerometers generate a voltage proportional to acceleration as the crystal is mechanically stressed by vibration.
6.Before liquid penetrant testing, the surface must be free of contaminants (oil, grease, water) for at least what distance beyond the inspection area?
- A.1/4 inch
- B.1 inch✓
- C.1 foot
- D.No clearance is required
Why: A standard surface-prep requirement calls for at least 1 inch of clean surface surrounding the area being inspected.
7.An isochronous governor is defined by its ability to:
- A.Allow speed to drop as load increases
- B.Maintain one constant speed regardless of load changes✓
- C.Only function above a minimum load
- D.Require manual adjustment at every load change
Why: Isochronous governing holds speed constant across the entire load range, with zero steady-state droop.
8.On a steam turbine, blading in the low-pressure (LP) stages typically experiences the most erosion because of:
- A.Extremely high steam temperature
- B.Wet, moisture-laden steam impacting the blades✓
- C.Excessive lubrication
- D.Low rotational speed
Why: LP stage steam is wetter (higher moisture content), and water droplet impact erodes the trailing edges of LP blading over time.
39 more Preventive & Predictive Maintenance questions inside
Plus a timed 433A exam simulator, spaced-repetition review of every question you get wrong, and an AI tutor you can ask “why?”.
Start free — 20 questions a day →RedSeal Prep Pro is an independent study tool. Practice questions are original content written in the style of the Certificate of Qualification and are not affiliated with the Red Seal Program, the Industrial Mechanic (Millwright) trade board, or any provincial certification body.