Motor controls final exam 2025 latest
update correctly answered
T or F. when a machine is installed, the motor, machine, and controls are all interrelated and must be
considered and must be considered as a unit - correct answer ✔✔true
T or F. the most complicated method of starting a motor is across-the-line starting - correct answer
✔✔false
T or F. push buttons are always shown as normally opens - correct answer ✔✔false
T or F. limit switches are drawn by adding a wedge to one of the four basic switches - correct answer
✔✔true
T or F. manual starters are characterized by the fact that the operator must go to the location of the
starter to initiate any change of action - correct answer ✔✔true
T or F. Integral horsepower manual starters with low voltage release will not restart after a power failure
without being reset - correct answer ✔✔true
T or F. Overloads are designed to protect the circuit from a short-circuit condition - correct answer
✔✔false
T or F. three-phase motors must have an overload sensor (heaters or magnetic coils) in two of the three-
phase lines - correct answer ✔✔false
T or F. relays are electromechanical switches that lack auxiliary contacts - correct answer ✔✔false
, T or F. the greatest difference between relays and contractors is the fact that contactors are equipped
with large contacts that are intended to connect high current loads to the power line - correct answer
✔✔true
T or F. most industrial motors operate on voltages that range from 240 to 480 volts - correct answer
✔✔true
T or F. common voltage values for motor starter coils (in volts AC) are: 24,120,208,240,277,480, and 560
- correct answer ✔✔true
T or F. schematic and wiring diagrams are the written language of control circuits - correct answer
✔✔true
T or F. when a relay is energized, all the contacts controlled by that relay change position - correct
answer ✔✔true
T or F. schematics in industry are often complicated and may contain several pages - correct answer
✔✔true
T or F. notation is generally used to help the electrician interpret the meaning of certain components and
find contacts that re controlled by coils - correct answer ✔✔true
T or F. hand-off-automatic controls are used to prevent an operator from selecting between automatic or
manual operation of a motor - correct answer ✔✔false
T or F. A flow switch can be used to detect the flow of water to insure that a fan motor cannon run if
there is no flow of cooling water - correct answer ✔✔true
the conductor size, fuse of circuit breaker size, and overload size are generally determined using the
______ - correct answer ✔✔national electric code
fuses and circuit breakers are generally employed for circuit protection, and ______ are used to protect
the motor - correct answer ✔✔overload relays
update correctly answered
T or F. when a machine is installed, the motor, machine, and controls are all interrelated and must be
considered and must be considered as a unit - correct answer ✔✔true
T or F. the most complicated method of starting a motor is across-the-line starting - correct answer
✔✔false
T or F. push buttons are always shown as normally opens - correct answer ✔✔false
T or F. limit switches are drawn by adding a wedge to one of the four basic switches - correct answer
✔✔true
T or F. manual starters are characterized by the fact that the operator must go to the location of the
starter to initiate any change of action - correct answer ✔✔true
T or F. Integral horsepower manual starters with low voltage release will not restart after a power failure
without being reset - correct answer ✔✔true
T or F. Overloads are designed to protect the circuit from a short-circuit condition - correct answer
✔✔false
T or F. three-phase motors must have an overload sensor (heaters or magnetic coils) in two of the three-
phase lines - correct answer ✔✔false
T or F. relays are electromechanical switches that lack auxiliary contacts - correct answer ✔✔false
, T or F. the greatest difference between relays and contractors is the fact that contactors are equipped
with large contacts that are intended to connect high current loads to the power line - correct answer
✔✔true
T or F. most industrial motors operate on voltages that range from 240 to 480 volts - correct answer
✔✔true
T or F. common voltage values for motor starter coils (in volts AC) are: 24,120,208,240,277,480, and 560
- correct answer ✔✔true
T or F. schematic and wiring diagrams are the written language of control circuits - correct answer
✔✔true
T or F. when a relay is energized, all the contacts controlled by that relay change position - correct
answer ✔✔true
T or F. schematics in industry are often complicated and may contain several pages - correct answer
✔✔true
T or F. notation is generally used to help the electrician interpret the meaning of certain components and
find contacts that re controlled by coils - correct answer ✔✔true
T or F. hand-off-automatic controls are used to prevent an operator from selecting between automatic or
manual operation of a motor - correct answer ✔✔false
T or F. A flow switch can be used to detect the flow of water to insure that a fan motor cannon run if
there is no flow of cooling water - correct answer ✔✔true
the conductor size, fuse of circuit breaker size, and overload size are generally determined using the
______ - correct answer ✔✔national electric code
fuses and circuit breakers are generally employed for circuit protection, and ______ are used to protect
the motor - correct answer ✔✔overload relays
