1.Most common cause of electric motor failure?
- A.Shaft misalignment
- B.Bearing failure from improper lubrication✓
- C.Voltage fluctuation
- D.Manufacturing defect
Why: Bearing failure is #1 — usually from improper lubrication (too much/little/wrong type), contamination, or misalignment.
2.Which bearing handles both radial and thrust loads?
- A.Cylindrical roller
- B.Angular contact bearing✓
- C.Needle roller
- D.Thrust bearing
Why: Angular contact bearings have angled raceways for combined radial + axial loads. Tapered rollers also work.
3.What gear type transmits motion between perpendicular shafts?
- A.Spur gears
- B.Bevel gears✓
- C.Helical gears
- D.Herringbone gears
Why: Bevel gears transmit power between intersecting shafts (typically 90°). Worm gears also work at 90° but don't intersect.
4.Alignment shim calculation uses which variables?
- A.Shaft diameter only
- B.Gap, distance between supports, distance to correction✓
- C.Dial reading only
- D.Coupling diameter and torque
Why: Shims = G × (A/B) where G = gap/offset, A = distance to correction, B = distance between measurement points.
5.A "floating" bearing in a shaft assembly with a fixed (locating) bearing exists to:
- A.Provide extra radial load capacity
- B.Allow for thermal expansion of the shaft✓
- C.Replace the need for lubrication
- D.Increase bearing lifespan by 50%
Why: As the shaft heats up and grows in length, a floating (non-locating) bearing's outer race can shift axially in its housing to absorb that growth.
6.A jaw-type (Lovejoy-style) flexible coupling uses an elastomeric element known as a:
- A.Bellows
- B.Diaphragm
- C.Spider✓
- D.Grid
Why: Jaw couplings use a rubber/urethane spider inserted between the two interlocking jaw hubs to cushion torque and absorb minor misalignment.
7.A pillow block housing with grease lubrication should typically be filled to about:
- A.10% of free space
- B.1/3 (30%) of free space✓
- C.Completely full
- D.90% of free space
Why: Overfilling a grease-lubricated housing causes churning and overheating; about 1/3 full is the common guideline.
8.When installing a bearing that requires heating for a shrink fit, standard practice limits induction/oven heating to about:
- A.100°F (38°C)
- B.250°F (121°C)✓
- C.500°F (260°C)
- D.800°F (427°C)
Why: 250°F is the commonly used maximum heating temperature for mounting antifriction bearings, avoiding tempering the bearing steel.
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