WorksheetsEES201 final TEST
Total questions: 63
Worksheet time: 32mins
Current-carrying conductors used in the AC system of an RV are required to be of the
low voltage type
solid copper type
stranded copper type
flexible copper type
In determining wire size by gauge, the larger the gauge number ,the
longer the wire length required
more over current provided
larger the wire
the smaller the wire
When measured with an ohmmeter , an unfailed overcurrent protection device will have
zero resistance
very high resistance
12 VDC
120 VAC
In the following schematic diagram (edit the graphics S1=A R1=B R2=C C1=D C2=E T1=F
D and E are batteries
A is closed
F is a relay
B and C are resistors
The distribution panel image would require
50 amp shoreline
65 amp shoreline
30 amp shoreline
15 shoreline
The following symbol is
closed contact
open contact
inductor(coil)
fixed resistor
The following symbol is a
single pole , single throw
single pole double throw
double pole double throw
double pole single throw
If resistance is added to a series circuit , the current flow
increases
remains the same
decreases
none of the above
An ohm is a measurement of
power
current
resistance
voltage
Determine the wattage of an AC circuit that draws 15 amps at 120 VAC
8 watts
18 watts
180 watts
1800 watts
Which bulb will use the least amperage
115V,60 w
115V,100w
12V ,60W
12V , 100w
Arefrigerator is not functioning properly in the electrical mode (no cooling) The resistance of the heating element reveals that it has 20.75 ohms of resistance. The data plate indicates that the refrigerator heating element should draw 325 W on 120VAC . The technician should
check for 120 on the heating element
replace with a higher wattage element
check the size of circuit breaker
replace the heating element
when raising the voltage of a 120 VAC resistive load, its amperage draw will
increase
remain the same
decrease
increase 1 amp for every 10 volts
the ground and neutral wires from the 120 VAC shoreline power should be attached
to a separate buss bar
in the same buss bar
to the converter case
to the circuit breaker case
What color wire is present in the 50 amp shore cord that is not present in a 30 amp shore cord
blue
red
yellow
black
If a 50 amp distribution center ,when plugged into a 50amp shore power , what is the voltage between Leg 1 and neutral as measured in the coach distribution panel?
0 VAC
12VAC
120VAC
240VAC
the neutral in the distribution panel board of an RV must
always be connected to the ground buss bar
always remain isolated from ground
always be of stranded wire
never be connected to a breaker
The neutral wire connected to the 120 VAC shore line power should be ungrounded
in all 120 VAC RV wiring
only in RVs employing more than 3 more branch circuits
only when 30 amp service is used
only in Class A motor homes
How does an RV get an earth ground
from the tires on the ground
from shoreline attached to pedestal
from buss bar in distribution panel
from grounding RV chassis
On a motor home with a 50 amp power supply cord , the total AC amp capacity available to that coach would be
50 amp
100 amp
dependent on the number of circuit
dependent on the length of the cord
A 50 amp shore power outlet has how many watts of power ?
3000
3600
5500
12000
In the following image the white wire should be connected at the distribution panel to
an isolated neutral buss bar
to ground buss bar
to circuit breaker
to the metal of the panel
In the following image the black wires should be connected at the distribution panel
an isolated neutral buss bar
to ground buss bar
to circuit breaker
to the metal of the panel
What is the voltage reading between A and B
12 VAC
12 VDC
120 VAC
120VDC
When replacing a distribution panel board , what electrical cabling is typically used on the AC side
service jr (SJ) wire
romex or nm electrical cable
stranded
extension cable
While troubleshooting an intermittent voltage drop on the AC system , a possible cause is
a loose or faulty connection in the distibution panel
improper wire size
intermittent converter output
incorrect generator frequency
If a customer complains of low voltage at the AC panel , the technician should FIRST
recalibrate his/her meter
check voltage at the pedestal
check the polarity indicator
replace the overcurrent protection device
A technician needs to install a 13500 BTU/hr air conditioner. what is the minimum gauge of non metallic sheathed cable required ?
14/3
12/3
14/2
12/2
All of the following can be causes of low voltage conditions EXCEPT
undersized conductor
bad connections
Undersized overcurrent protection
discharged batteries
A voltmeter must always be connected
in series with the source
on the positive side
in parallel with the circuit or load
in relationship to the component
To manually discharge an air conditioner's run capacitor , a technitian should set the AC voltmeter to
highest AC scale
120 VAC
12VDC
240VDC
If a 15 amp breaker continues to blow after you have verified a 9 amp load you should replace
heat spring
contacts
heat bar
breaker
If a 120 VAC circuit breaker will not reset the technician should
disassemble and clean the contacts
disassemble and replace the contacts
replace the breaker with one of the same amperage
replace the breaker with one of higher amperage
When installing a new circuit breaker , the hot wire(black) should be
hand tightende
tightened half past contact
torqued to specification
as tight as tool can be without stripping
An exterior 120 VAC receptacale is on a CGIF protected circuit with multiple outlets. There is no voltage present at only one of the receptacles in the bathroom. what is the possible cuase
GFCI test button is tripped in the bathroom
GFCI is incorrectly wired in the bathroom
GFCI breaker is tripped
the main circuit breaker is off
A GFCI on a 120 VAC circuit operates by sensing an imbalance of
voltage between hot and ground
voltage between hot and neutral
current between hot and ground
current between hot and neutral
The connector on a GFCI receptacle that is labeled LOAD is
the same as line input
the power coming into the receptacle
the outlet that is downstream of the GFCI
should never have wiring connected
GFCI protection can be provided though specific GFCI receptacles or GFCI
circuit breakers
diodes
capacitors
conductors
Which of the following likely contributes to a hot skin condition?
incorrect polarity of the battery system
incorrect polarity of the shore cord
shore cord voltage too high
converter voltage feedback
What is the most common hot skin problems in RVs
blown fuses
tripped breakers
high resistance shorts
dead shorts
What is the correct meathod for performing a hot skin test on an RV
unplug the RV from shore power and use a VOM to check for voltage between a bare metal surface on the RV and the neutral grounding bar
with a generator running use a VOM to check for voltage between a bare metal surface on the RV and a known earth ground
with batteries fully charged use aVOM to check for voltage between a bare metal surface on the RV and the neutral grounding bar
plug the RV into shore power and use a VOM to check for voltage between a bare metal surface on the RV and a known earth ground
On a hot skin test the RV breakers must be
off
open
on
removed
Technician A says that a generator's neutral and ground must be tied together when the generator is supplying AC power . Tech B says that they must always be kept isolated. which tech is correct
tech A
techB
both
neither
A customer reports that the generator will not start from either the remote control panel .
All of the following are likely causes except
low battery voltage
bad starter solenoid
faulty start switch on the remote panel
loose or poor connections
When the generator is running and supplying power but there is no power to the distribution panel , what is the possible cuase
improper speed of generator
weak converter
faulty transfer switch
inverter turned off
A typical RV transfer switch is activated whenever
the coach is plugged into shore power
the inverter is plugged in
the generator is started
the batteries need changing
An inverter is used to convert
AC to AC power
DC to AC power
AC to DC power
DC to DC power
Before replacing an inverter the technician should always
turn the branch breaker on
disconnect the battery isolator
disconnect battery and AC connection
short across battery terminal + to ground to discharge filters
For inverter installation it is important to do all of the following except
adequately size inverter output for connected loads
provide AC overcurrent circuit protection
provide DC overcurrent protection
use large cranking batteries
It is recommended that inverters be installed
in the generator compartment
in a protective box
in the forward hanging locker
near the batteries
When moving a 120 VAC outlet and the wire is short you should
splice the wire with scotch locks
replace the wire with a new one of the proper length
use only crimping connectors and splice
replace the outlet with a larger one
According to NFPA where cable connections or clamps are used , the cables need to be secured and supported within
6" of the outlet boxes junction boxes and panel boards
12" of outlet boxes , junction boxes and panel boards
not necessary if installed inside a cabinet or wall
not necessary
Relating to RV wiring , any area accessible to the RV owner for storage or in a traffic area is considered to be
acceptable for uncovered RV wiring
acceptable for RV wiring as long as it is covered and protected
unacceptable if RV wiring is present
subject to physical damage in outside compartments only
Which of the following is NOT a protection for non metallic sheathed cable
rigid metal conduit
intermediate metal conduit
rubber hose conduit
liquid tight flexible conduit
Exterior receptacals are required to
only have a weather proof cover
be protected by a GFCI device
be on an isolated circuit
to be the only recepticale
Exterior receptacles must have
a cover that opens up
a cover that opens down
a wet location cover
a weather proof gasket
What is the function of an energy managment system
optimize generator efficiency
optimize 12VDC distribution
optimize 120VAC distribution
optimize inverter efficiency
If an RV with a 30 amp power supply ha smore than two 120 VAC thermostatically controlled appliances what must be done
an extra circuit breaker must be installed
an energy management system must be installed
nothing no action needed
only one of the controlled appliances can be used at a time
Which of the following is not a type of energy management system (EMS)
manual
automatic
programable
on- demand
The principle function of an EMS is to
balance AC loads in distibution panels
boost the available power
shed load
protect the appliences from over current
Prior to adding new electrical device the technician should identify all of the following except
voltage amperage wattage required
circuit and devices attached to the circuit
manufacturer of the device
capacity of circuit to accommodate the new device
When adding a new device and no receptacle is provided the equipment cannot exceed _______of branch cicuit
50%
25%
75%
100%
When there are six or more circuits in a RV the minimum power supply assembly is a
30 amp without an energy management system
50 amp distibution panel
two 120 volt circuits
30 amp with energy management system
