SACA Motor Controls Questions And Answers With
Verified Updates
/. Parts of an electrical system that should be connected to earth ground include
__________. - Answer-metal raceways, metal conduit, metal enclosures (all of the
above)
/.The __________ is the accepted standard in the United States for safely installing and
maintaining electrical systems and equipment. - Answer-NEC
/.Which of the following is not a basic rule of electrical safety? - Answer-Always work by
yourself
/.Who should remove a lockout/tagout? - Answer-Only the person(s) who installed it
/.Three-phase power is transmitted in phases that are __________ degrees apart. -
Answer-120
/.Which of the following is not a common voltage supplied by a wye-configured system?
- Answer-240 VAC
/.A grounded neutral wire can be used as an equipment ground. - Answer-false
/.A ground fault occurs when __________. - Answer-one of the phases becomes
grounded
/.A fusible disconnect includes what? - Answer-Fuses, Manually operated switch,
Enclosure.
/.A time-delay fuse only has one element. - Answer-False
/.Which of the following is a factor that must be considered when selecting overcurrent
protection devices for a motor control circuit? - Answer-Rated full-load current of the
motor
/.Which of the following is a component of a typical three-phase squirrel-cage motor? -
Answer-Copper bars, End rings, Iron core
/.Which of the following items on a motor's nameplate is used to determine how much
output power a motor can safely produce above its rated output power? - Answer-
Service Factor
/.If the service factor for a motor is not given on the nameplate, what should you
assume the service factor to be? - Answer-1
, /.Which of the following is not a result of connecting a dual-voltage motor to operate on
the higher voltage? - Answer-Increased current draw
/.What are the functions of motor control? - Answer-Speed control, reversing, start/stop
control.
/.A motor starter is the same as a motor controller. - Answer-False
/.Magnetic contactors open and close their contacts through the use of a magnetic coil. -
Answer-True
/.The type of manual starter used for three-phase motors is a __________. - Answer-
integral horsepower starter
/.The contacts of a manual starter will remain in the actuated position when power is
lost. - Answer-True
/.__________ protection on a manual starter will prevent the automatic restart of a
motor when recovering from a power loss. - Answer-Undervoltage
/.Some manual motor starters use a special sensing coil that verifies the presence of
incoming voltage to open the starter contacts when the voltage is below a preset level. -
Answer-True
/.Which type of overload uses a coil to sense the level of motor current? - Answer-
Magnetic overload
/.Bimetallic overloads do not allow you to adjust the trip point. - Answer-False
/.NEMA overloads often use melting alloy thermal overloads. - Answer-True
/.A magnetic overload includes a dashpot which allows adjustments to the response
time of the overload. - Answer-True
/.A transformer uses the principle of __________. - Answer-mutual inductance
/.Which of the following is not a component of a transformer? - Answer-Electrical
coupling
/.The relationship between the input voltage and output voltage of a transformer is
based on the __________. - Answer-turns ratio
/.The output voltage of a transformer can be determined if you know the input voltage
and the turns ratio. - Answer-True
Verified Updates
/. Parts of an electrical system that should be connected to earth ground include
__________. - Answer-metal raceways, metal conduit, metal enclosures (all of the
above)
/.The __________ is the accepted standard in the United States for safely installing and
maintaining electrical systems and equipment. - Answer-NEC
/.Which of the following is not a basic rule of electrical safety? - Answer-Always work by
yourself
/.Who should remove a lockout/tagout? - Answer-Only the person(s) who installed it
/.Three-phase power is transmitted in phases that are __________ degrees apart. -
Answer-120
/.Which of the following is not a common voltage supplied by a wye-configured system?
- Answer-240 VAC
/.A grounded neutral wire can be used as an equipment ground. - Answer-false
/.A ground fault occurs when __________. - Answer-one of the phases becomes
grounded
/.A fusible disconnect includes what? - Answer-Fuses, Manually operated switch,
Enclosure.
/.A time-delay fuse only has one element. - Answer-False
/.Which of the following is a factor that must be considered when selecting overcurrent
protection devices for a motor control circuit? - Answer-Rated full-load current of the
motor
/.Which of the following is a component of a typical three-phase squirrel-cage motor? -
Answer-Copper bars, End rings, Iron core
/.Which of the following items on a motor's nameplate is used to determine how much
output power a motor can safely produce above its rated output power? - Answer-
Service Factor
/.If the service factor for a motor is not given on the nameplate, what should you
assume the service factor to be? - Answer-1
, /.Which of the following is not a result of connecting a dual-voltage motor to operate on
the higher voltage? - Answer-Increased current draw
/.What are the functions of motor control? - Answer-Speed control, reversing, start/stop
control.
/.A motor starter is the same as a motor controller. - Answer-False
/.Magnetic contactors open and close their contacts through the use of a magnetic coil. -
Answer-True
/.The type of manual starter used for three-phase motors is a __________. - Answer-
integral horsepower starter
/.The contacts of a manual starter will remain in the actuated position when power is
lost. - Answer-True
/.__________ protection on a manual starter will prevent the automatic restart of a
motor when recovering from a power loss. - Answer-Undervoltage
/.Some manual motor starters use a special sensing coil that verifies the presence of
incoming voltage to open the starter contacts when the voltage is below a preset level. -
Answer-True
/.Which type of overload uses a coil to sense the level of motor current? - Answer-
Magnetic overload
/.Bimetallic overloads do not allow you to adjust the trip point. - Answer-False
/.NEMA overloads often use melting alloy thermal overloads. - Answer-True
/.A magnetic overload includes a dashpot which allows adjustments to the response
time of the overload. - Answer-True
/.A transformer uses the principle of __________. - Answer-mutual inductance
/.Which of the following is not a component of a transformer? - Answer-Electrical
coupling
/.The relationship between the input voltage and output voltage of a transformer is
based on the __________. - Answer-turns ratio
/.The output voltage of a transformer can be determined if you know the input voltage
and the turns ratio. - Answer-True
