CFESA ELECTRICAL PRACTICE TEST EXAM QUESTIONS
WITH COMPLETE SOLUTION
A capacitor start motor should be used in what applications?
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?
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?
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?
True
A thermostat has a differential of 5°F. This means:
the temperature needs to drop 5 degrees below the set point before the
heating system turns on
Wall receptacles failed due to:
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?
False
Before working on electrical equipment with the power on:
Proper PPE must be worn, example of this is linesman's gloves
Add 240 V range connected to a 208 V power supply will:
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?
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?
P= I x I x R
, A hot line in an AC power supply contains 120 V. T or F?
False, 120 volts is the difference in potential between the hot line and
neutral.
On the ohms law wheel what does P stand for?
Power
Line voltage is the potential difference between:
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:
1/1000
The total resistance of a unit but the 230 amp heating elements
connected in a series is:
The total sum of the individual resistances- RT= R1+R2+R3...
The total resistance in an parallel circuit is called:
1/RT= 1/R1+1/R2...
Power defined by the ohms law formula:
Amount of electrical energy used
Any thermostat that fails in a closed contact position:
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:
This usually indicates a worn hub on the blade
Higher voltage supplies are used to:
Decrease wire size and save costs, they also are needed for modern
luxuries such as Central A/C, driers, etc.
A wild leg must always be connected where on the terminal block on
a three phase equipment?
A "wild leg" (also called a "high leg") in a three-phase system should
always be connected to the designated "B" phase terminal on a terminal
block, as per standard electrical practice, which usually marks the phase
with the higher voltage to neutral as "B" phase, it must not go on the 120 v
terminal.
Voltage between the Hotline and neutral of a 208 V power supply:
120V
On the ohms law wheel what does R stand for?
Resistance(ohms)
When your customer leans over metal counter and touches the
toaster a shark is received. You have checked the toaster and the
ground circuit is complete. You should:
Unplug and inspect the grounding
WITH COMPLETE SOLUTION
A capacitor start motor should be used in what applications?
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?
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?
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?
True
A thermostat has a differential of 5°F. This means:
the temperature needs to drop 5 degrees below the set point before the
heating system turns on
Wall receptacles failed due to:
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?
False
Before working on electrical equipment with the power on:
Proper PPE must be worn, example of this is linesman's gloves
Add 240 V range connected to a 208 V power supply will:
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?
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?
P= I x I x R
, A hot line in an AC power supply contains 120 V. T or F?
False, 120 volts is the difference in potential between the hot line and
neutral.
On the ohms law wheel what does P stand for?
Power
Line voltage is the potential difference between:
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:
1/1000
The total resistance of a unit but the 230 amp heating elements
connected in a series is:
The total sum of the individual resistances- RT= R1+R2+R3...
The total resistance in an parallel circuit is called:
1/RT= 1/R1+1/R2...
Power defined by the ohms law formula:
Amount of electrical energy used
Any thermostat that fails in a closed contact position:
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:
This usually indicates a worn hub on the blade
Higher voltage supplies are used to:
Decrease wire size and save costs, they also are needed for modern
luxuries such as Central A/C, driers, etc.
A wild leg must always be connected where on the terminal block on
a three phase equipment?
A "wild leg" (also called a "high leg") in a three-phase system should
always be connected to the designated "B" phase terminal on a terminal
block, as per standard electrical practice, which usually marks the phase
with the higher voltage to neutral as "B" phase, it must not go on the 120 v
terminal.
Voltage between the Hotline and neutral of a 208 V power supply:
120V
On the ohms law wheel what does R stand for?
Resistance(ohms)
When your customer leans over metal counter and touches the
toaster a shark is received. You have checked the toaster and the
ground circuit is complete. You should:
Unplug and inspect the grounding
