CFESA ELECTRICAL PRACTICE TEST
CORRECT 100%
A capacitor start motor should be used in what applications? - ANSWER used for
heavy-duty applications requiring high starting torque. refrigerator compressors, pumps,
and conveyors.
You have 120 V super warmer that is not heating. Your meter reads 120 V from each
side of the element to the ground. The voltage across the element reads 0 V. What is
the issue? - ANSWER Open neutral after the element
If you check each side of an element terminal to ground and read 120 V does that mean
the element has voltage to it? - ANSWER No measure voltage across the load, not from
each terminal to ground
A ground fault breaker is considered more reliable than a ground fault receptacle. T or
F? - ANSWER True
A thermostat has a differential of 5°F. This means: - ANSWER the temperature needs to
drop 5 degrees below the set point before the heating system turns on
Wall receptacles failed due to: - ANSWER loose wires, overloaded circuits (tripped
breakers), damaged internal components, wear and tear from frequent use, exposure to
moisture, or physical damage which can lead to poor connections or short circuits.
It is still possible to get shocked by touching the casing of a piece of equipment if it is
properly grounded. T or F? - ANSWER False
Before working on electrical equipment with the power on: - ANSWER Proper PPE must
be worn, example of this is linesman's gloves
Add 240 V range connected to a 208 V power supply will: - ANSWER it will likely
operate with reduced power and potentially experience issues like longer cooking times,
decreased heating efficiency, and could potentially be damaged over time
AC power has a negative and a positive line. T or F? - ANSWER False, it has a hot and
a neutral
Which formula should you use to determine the power consumed by a 15 ohm heater
element with 8 A of current flowing through it? - ANSWER P= I x I x R
A hot line in an AC power supply contains 120 V. T or F? - ANSWER False, 120 volts is
the difference in potential between the hot line and neutral.
, On the ohms law wheel what does P stand for? - ANSWER Power
Line voltage is the potential difference between: - ANSWER any two lines and phases in
a three-phase electrical system; essentially, the voltage measured between two live
wires in a power circuit.
Prefix Milli means: - ANSWER 1/1000
The total resistance of a unit but the 230 amp heating elements connected in a series is:
- ANSWER The total sum of the individual resistances- RT= R1+R2+R3...
The total resistance in an parallel circuit is called: - ANSWER 1/RT= 1/R1+1/R2...
Power defined by the ohms law formula: - ANSWER Amount of electrical energy used
Any thermostat that fails in a closed contact position: - ANSWER Most likely carried an
excessive load. The thermostat was used in a power duty application or the thermostat
was involved in a short-circuited load.
If a blower keeps coming off the motor shaft after it runs for a while: - ANSWER This
usually indicates a worn hub on the blade
Higher voltage supplies are used to: - ANSWER Decrease wire size and save costs,
they also are needed for modern luxuries such as Central A/C, driers, etc.
What happens to current in a parallel circuit? - ANSWER It divides across the
resistances
What happens to voltage across the loads in a parallel circuit - ANSWER Stays the
same
What happens to voltage across loads in a series circuit - ANSWER It divides across
the resistances
What happens to the current in a series circuit? - ANSWER It stays the same
everywhere
What is the voltage between two hot lines in a 230 V system? - ANSWER 230 V
What is the voltage between two hot lines in a 208 V system? - ANSWER 208 V
What is the voltage between a hotline and a neutral and a 230 single volt phase supply -
ANSWER 115 V
CORRECT 100%
A capacitor start motor should be used in what applications? - ANSWER used for
heavy-duty applications requiring high starting torque. refrigerator compressors, pumps,
and conveyors.
You have 120 V super warmer that is not heating. Your meter reads 120 V from each
side of the element to the ground. The voltage across the element reads 0 V. What is
the issue? - ANSWER Open neutral after the element
If you check each side of an element terminal to ground and read 120 V does that mean
the element has voltage to it? - ANSWER No measure voltage across the load, not from
each terminal to ground
A ground fault breaker is considered more reliable than a ground fault receptacle. T or
F? - ANSWER True
A thermostat has a differential of 5°F. This means: - ANSWER the temperature needs to
drop 5 degrees below the set point before the heating system turns on
Wall receptacles failed due to: - ANSWER loose wires, overloaded circuits (tripped
breakers), damaged internal components, wear and tear from frequent use, exposure to
moisture, or physical damage which can lead to poor connections or short circuits.
It is still possible to get shocked by touching the casing of a piece of equipment if it is
properly grounded. T or F? - ANSWER False
Before working on electrical equipment with the power on: - ANSWER Proper PPE must
be worn, example of this is linesman's gloves
Add 240 V range connected to a 208 V power supply will: - ANSWER it will likely
operate with reduced power and potentially experience issues like longer cooking times,
decreased heating efficiency, and could potentially be damaged over time
AC power has a negative and a positive line. T or F? - ANSWER False, it has a hot and
a neutral
Which formula should you use to determine the power consumed by a 15 ohm heater
element with 8 A of current flowing through it? - ANSWER P= I x I x R
A hot line in an AC power supply contains 120 V. T or F? - ANSWER False, 120 volts is
the difference in potential between the hot line and neutral.
, On the ohms law wheel what does P stand for? - ANSWER Power
Line voltage is the potential difference between: - ANSWER any two lines and phases in
a three-phase electrical system; essentially, the voltage measured between two live
wires in a power circuit.
Prefix Milli means: - ANSWER 1/1000
The total resistance of a unit but the 230 amp heating elements connected in a series is:
- ANSWER The total sum of the individual resistances- RT= R1+R2+R3...
The total resistance in an parallel circuit is called: - ANSWER 1/RT= 1/R1+1/R2...
Power defined by the ohms law formula: - ANSWER Amount of electrical energy used
Any thermostat that fails in a closed contact position: - ANSWER Most likely carried an
excessive load. The thermostat was used in a power duty application or the thermostat
was involved in a short-circuited load.
If a blower keeps coming off the motor shaft after it runs for a while: - ANSWER This
usually indicates a worn hub on the blade
Higher voltage supplies are used to: - ANSWER Decrease wire size and save costs,
they also are needed for modern luxuries such as Central A/C, driers, etc.
What happens to current in a parallel circuit? - ANSWER It divides across the
resistances
What happens to voltage across the loads in a parallel circuit - ANSWER Stays the
same
What happens to voltage across loads in a series circuit - ANSWER It divides across
the resistances
What happens to the current in a series circuit? - ANSWER It stays the same
everywhere
What is the voltage between two hot lines in a 230 V system? - ANSWER 230 V
What is the voltage between two hot lines in a 208 V system? - ANSWER 208 V
What is the voltage between a hotline and a neutral and a 230 single volt phase supply -
ANSWER 115 V
