Electric Motor Controls Study Guide
questions with complete solutions
equipment grounding involves connecting all metal parts that do not carry current under normal
conditions to ___________ - correct answer ✔✔Earth ground
The most dangerous path for electric current to the human body is _________ - correct answer
✔✔through the chest
the best way to avoid electrical shock is work in equipment ______ - correct answer ✔✔de-energized
when performing service or maintenance on equipment all power sources (electrical, mechanical,
pneumatic,...) must be _______________ - correct answer ✔✔Locked out & tagged out
the only person that can remove a lock out/ tag out is the person that _______ - correct answer
✔✔installed it
3 phase power is transmitted with each phase _____________ degrees apart - correct answer ✔✔120
name the two basic three phase systems for power distribution - correct answer ✔✔delta & wye
if a three phase wye is 208V phase to phase, any phase to neutral equals __________ - correct answer
✔✔120 V
the voltage reading across a disconnect fuse is 208V indicates _______ - correct answer ✔✔blown fuse
a dual element fuse is used when dealing with _______ current - correct answer ✔✔High inrush
, a motors locked rotor current is typically ____ times greater than its operating current - correct answer
✔✔6
current that is drawn when a motor is first started up is known as in-rush or _______ - correct answer
✔✔Locked rotor
the current drawn by a motor when operating at its rated full load speed is called __________ - correct
answer ✔✔full load current (FLA)
name the two main parts of an AC electric motor - correct answer ✔✔stator & rotor
the speed listening on an AC motor indicates the speed a motor runs at when delivering its rated
_______ - correct answer ✔✔horse power
a dual voltage motor that is run on the higher voltage will draw _____ current - correct answer ✔✔Less
does a motor controller include overload protection for a motor? - correct answer ✔✔no
A motor starter is a motor controller with _________ - correct answer ✔✔overload protection
name the three most common types of overloads - correct answer ✔✔thermal breakers, magnetic
breakers, solid state
a transformer is an ______ device that converts AC power from one voltage level to another - correct
answer ✔✔Inductive
the secondary voltage of a transformer is determined by the input voltage and the ______ - correct
answer ✔✔turns ratio
the power relationship of a transformer is power in is approximately equal to __________ - correct
answer ✔✔Power out
questions with complete solutions
equipment grounding involves connecting all metal parts that do not carry current under normal
conditions to ___________ - correct answer ✔✔Earth ground
The most dangerous path for electric current to the human body is _________ - correct answer
✔✔through the chest
the best way to avoid electrical shock is work in equipment ______ - correct answer ✔✔de-energized
when performing service or maintenance on equipment all power sources (electrical, mechanical,
pneumatic,...) must be _______________ - correct answer ✔✔Locked out & tagged out
the only person that can remove a lock out/ tag out is the person that _______ - correct answer
✔✔installed it
3 phase power is transmitted with each phase _____________ degrees apart - correct answer ✔✔120
name the two basic three phase systems for power distribution - correct answer ✔✔delta & wye
if a three phase wye is 208V phase to phase, any phase to neutral equals __________ - correct answer
✔✔120 V
the voltage reading across a disconnect fuse is 208V indicates _______ - correct answer ✔✔blown fuse
a dual element fuse is used when dealing with _______ current - correct answer ✔✔High inrush
, a motors locked rotor current is typically ____ times greater than its operating current - correct answer
✔✔6
current that is drawn when a motor is first started up is known as in-rush or _______ - correct answer
✔✔Locked rotor
the current drawn by a motor when operating at its rated full load speed is called __________ - correct
answer ✔✔full load current (FLA)
name the two main parts of an AC electric motor - correct answer ✔✔stator & rotor
the speed listening on an AC motor indicates the speed a motor runs at when delivering its rated
_______ - correct answer ✔✔horse power
a dual voltage motor that is run on the higher voltage will draw _____ current - correct answer ✔✔Less
does a motor controller include overload protection for a motor? - correct answer ✔✔no
A motor starter is a motor controller with _________ - correct answer ✔✔overload protection
name the three most common types of overloads - correct answer ✔✔thermal breakers, magnetic
breakers, solid state
a transformer is an ______ device that converts AC power from one voltage level to another - correct
answer ✔✔Inductive
the secondary voltage of a transformer is determined by the input voltage and the ______ - correct
answer ✔✔turns ratio
the power relationship of a transformer is power in is approximately equal to __________ - correct
answer ✔✔Power out
