WorksheetsIDA201 CH9 Electric Motor Components Quiz - Mr. Graham
Total questions: 15
Worksheet time: 8mins
Which type of starting relay operates using back electromotive force (EMF)?
Current relay
Solid-state relay
Potential relay
Hot-wire relay
Current relays are generally used on:
Large motors
Small hermetic motors
PSC motors
Three-phase motors
The coil of a potential relay is located between which terminals?
1 and 2
2 and 5
1 and 4
2 and 3
A positive temperature coefficient (PTC) device has resistance that:
Decreases as temperature increases
Increases as temperature increases
Remains constant
Drops to zero
Sleeve bearings are used in hermetic compressors because:
They are more efficient
They are quieter
No danger of sparks
They last longer
Ball bearings are lubricated by:
Oil wick
Grease fittings
Hand‑packed grease
All of the above
Direct drive requires:
Same RPM as motor
Different RPM
Gear reduction
V‑belt
V‑belt sizes include:
A‑section
B‑section
FHP
All of the above
Current relay contacts close when:
Motor reaches full speed
High current during start‑up
Motor stops
Voltage drops
Potential relay contacts open when motor reaches:
50% speed
75–80% speed
100% speed
Start‑up
PTC devices are commonly used on:
Large motors
Small split-phase compressors
Three-phase motors
DC motors
Hard-start kits contain:
Potential relay only
Starting capacitor only
Both potential relay and capacitor
PTC device
Current relay coil resistance should be:
High
Low (0–1 ohm)
Infinite
Variable
Potential relay coil resistance is usually:
0–1 ohm
10–100 ohms
1,000–10,000 ohms
Infinite
When changing V-belts, technicians should:
Check size
Align properly
Tension correctly
All of the above
