The preferred method of speed control is to - ANSWER Alter frequency
DC bus circuit of VFD - ANSWER Filters out DC
Boxes enclosure protects from - ANSWER Environment
DC drives handle such applications as - ANSWER Cranes, hoist,
mining, drilling, winders, and coils
PLC industrial grade - ANSWER Computer
User-developed series of instructions - ANSWER Program
Non-mod or fixed PLC - ANSWER Power supply, processor,
input/output
Temperature surrounding the air - ANSWER ambient temperature
Main contacts of contactor act as - ANSWER A switch
Capacitors must be - ANSWER Discharged
VFD can operate a 3-phase from - ANSWER Single-phase AC power
Inverter circuit of a VFD acts to - ANSWER Switch DC bus voltage
Grounding VFD reduces - ANSWER Electromatic interference
VFD are required to have - ANSWER Disconnecting means
VFD can operate as - ANSWER motor protection device as well as
performing
, PLC output modules convert - ANSWER Signals from CPU
Adjustable speed drive - ANSWER All of the above
VFD not programmable - ANSWER type of enclosure
PLC was designed to replace - ANSWER Relay control panel
PLC input modules - ANSWER All of the above
What is not a function of PLC - ANSWER Run the user program
What may be programmed into a VFD - ANSWER All of the above
What determines the location of the VFD - ANSWER All of the above
Direct current motors cannot operate directly from - ANSWER The
power supplied by the electric utility system
L and X - ANSWER Low voltage winding leads on single phase
transformer
An electric generator is a machine that uses _____________ to convert
mechanical energy to electric energy - ANSWER magnetism
An electric motor uses ______ to operate - ANSWER electric current
and magnetism
The device that provides the mechanical energy input to a generator is
called the - ANSWER prime mover
Generators operate on the principle that a voltage is induced in a
conductor whenever the conductor is ___________ through a magnetic
field so as to cut the lines of force - ANSWER moved
Two basic categories of motors are - ANSWER AC/DC
DC bus circuit of VFD - ANSWER Filters out DC
Boxes enclosure protects from - ANSWER Environment
DC drives handle such applications as - ANSWER Cranes, hoist,
mining, drilling, winders, and coils
PLC industrial grade - ANSWER Computer
User-developed series of instructions - ANSWER Program
Non-mod or fixed PLC - ANSWER Power supply, processor,
input/output
Temperature surrounding the air - ANSWER ambient temperature
Main contacts of contactor act as - ANSWER A switch
Capacitors must be - ANSWER Discharged
VFD can operate a 3-phase from - ANSWER Single-phase AC power
Inverter circuit of a VFD acts to - ANSWER Switch DC bus voltage
Grounding VFD reduces - ANSWER Electromatic interference
VFD are required to have - ANSWER Disconnecting means
VFD can operate as - ANSWER motor protection device as well as
performing
, PLC output modules convert - ANSWER Signals from CPU
Adjustable speed drive - ANSWER All of the above
VFD not programmable - ANSWER type of enclosure
PLC was designed to replace - ANSWER Relay control panel
PLC input modules - ANSWER All of the above
What is not a function of PLC - ANSWER Run the user program
What may be programmed into a VFD - ANSWER All of the above
What determines the location of the VFD - ANSWER All of the above
Direct current motors cannot operate directly from - ANSWER The
power supplied by the electric utility system
L and X - ANSWER Low voltage winding leads on single phase
transformer
An electric generator is a machine that uses _____________ to convert
mechanical energy to electric energy - ANSWER magnetism
An electric motor uses ______ to operate - ANSWER electric current
and magnetism
The device that provides the mechanical energy input to a generator is
called the - ANSWER prime mover
Generators operate on the principle that a voltage is induced in a
conductor whenever the conductor is ___________ through a magnetic
field so as to cut the lines of force - ANSWER moved
Two basic categories of motors are - ANSWER AC/DC
