Title: Contactors and Motor Starters Test
Course: Motor Controls (IC 106-IC 106) > Section: Assessments

Q: ________ contactor assemblies are made of laminated steel.
- AC
- DC
- Low-voltage
- Static
A: AC

Q: _________ power lines(s) must be broken when using a contactor to control a three-phase load.
- One
- Two
- Three
A: One

Q: __________ are used to help confine, divide, and extinguish arcs for each set of contacts.
- Arc chutes
- Overloads
- Current transformers
- Transient suppression modules
A: Arc chutes

Q: __________ are used to provide a magnetic field that helps move contacts apart as quickly as possible.
- Silver contacts
- Current transformers
- Blow-out coils
- Transient suppression modules
A: Silver contacts

Q: _____________ are used on large motor starters to reduce the current flowing to the overload relay.
- Double-break contacts
- Current transformers
- Manual contactors
A: Double-break contacts

Q: A 120 V, single-phase power source has one hot wire and _________ neutral wire(s).
- 0
- 1
- 2
- 3
A: 0

Q: A 230 V, single-phase power source has two hot wires and ________ neutral wire(s).
- 0
- 1
- 2
- 3
A: 0

Q: A disconnect is a device that is used only periodically to remove electrical circuits from their supply source.
- True
- False
A: True

Q: AC arcs are the most difficult arcs to extinguish on a set of contacts.
- True
- False
A: False

Q: As ambient temperature increases, ___________ current is needed to trip overload devices.
- more
- less
- does not change
A: more

Q: Manual contactors are normally used with motor circuits and resistance loads.
- True
- False
A: False

Q: Mechanical interlocked contactors are two contactors that are connected in such a way that both sets of contacts cannot be closed at the same time.
- True
- False
A: True

Q: One of the advantages of using a double-break contact instead of a single-break contact is that a double-break contact __________.
- has a higher contact rating in a smaller space
- is not made of soft copper
- has a higher contact rating when enclosed in a steel case
- does not present an electrical hazard
A: has a higher contact rating in a smaller space

Q: The current rating of a contactor or motor starter is the rating for __________.
- each individual contact
- the whole contactor divided by the number of contacts
- 12 hr. of operation
- the whole contactor
A: each individual contact

Q: The main difference between a contactor and a motor starter is the addition of overload protection to the motor starter.
- True
- False
A: True

Q: The power rating of a contactor or motor  starter _________ as the NEMA number (Size 1, 2, etc.) of the contactor or motor starter increases.
- increases
- descreases
- remains the same
A: increases

Q: The expected reading of DMM 1 with the heating element OFF is ________ VAC.
- 0
- 120
- 230
- 460
A: 0

Q: The expected reading of DMM 1 with the heating element ON is ________ VAC.
- 0
- 120
- 230
- 460
A: 0

Q: The expected reading of DMM 2 with the heating element OFF is  _____________ VAC.
- 0
- 120
- 230
- 460
A: 0

Q: The expected reading of DMM 2 with the heating element ON is __________ VAC.
- 0
- 120
- 230
- 460
A: 0

Q: The expected reading of the clamp-on ammeter with the heating element ON is  _________ A.
- 0
- 4
- 12
- 36
A: 0

Q: The expected reading of DMM 1 with the heater OFF is ________ VAC.
- 0
- 24
- 120
- 230
A: 0

Q: The expected reading of DMM 1 with the heater ON is _________ VAC.
- 0
- 24
- 120
- 230
A: 0

Q: The expected reading of DMM 2 with the selector switch ON and the heater OFF is __________ VAC.
- 0
- 24
- 120
- 230
A: 0

Q: The expected reading of DMM 2 with the selector switch ON and the heater ON is __________ VAC.
- 0
- 24
- 120
- 230
A: 0