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WorksheetsRVTI Electrical 2 Module 3
Total questions: 37
Worksheet time: 18mins
To determine wire size by gauge, the smaller the gauge number,
the lower the voltage it can handle
the larger the wire
the smaller the wire
the less it cost
Any conductor used in an RV needs to be sized according to
the load and the overcurrent protection provided
the location and the length the wire will be run
the distribution panel size and capacity
the size and type of the RV
In the event of an excessive flow of current, fuses and circuit breakers are designed to protect a circuit by
opening only during component start up
opening and interrupting the flow of electricity through the circuit
opening only during a short circuit
limiting the amount of current flow
The most common types of fuses are
push button and toggle types
blade and cylinder types
“bat” and “aux”
Type 1 and Type II
Symbols A, K, and M are 12 VDC lamps. The voltage measure at V1 is
0 VCD
6 VDC
9 VDC
12 VDC
If switch S1 is closed, what will happen to the current across resistor R1 when switch S2 closes?
increase
decrease
no current
stay the same
The following symbol is
capacitor
battery
circuit breaker
inductor
The following system is
fuse
solenoid
relay
circuit breaker
A circuit supplied with 110V carries 5 amps current. The resistance valve of the circuit would be
550 ohms
11 ohms
5.5 ohms
55 ohms
If a technician changes a resistor with one of a lower resistance, at the same voltage its amperage draw will
increase
decrease
remain the same
decrease 1 amp for every 10 volts
When one volt is used to move one amp through a circuit, the work accomplished is equal to
one watt of power
100 watts of power
10 kilowatts
1 ohm
The following triangle represents
Ohm's Law
Watt's Law
Pascal's Law
Newton's Law
The resistance of a 100 W, 120V lamp is approximately
1 ohm
150 ohm
400 ohm
1200 ohm
In an electrical circuit, what happens to the current flowing through the wire if voltage is reduced to the half and resistance of the wire is doubled?
four times
a quarter
double
half
The specific gravity hydrometer reading of a fully charged battery will be
1,200
1,225
1,265
1,300
The diagram shows three batteries wired in
series
series/parallel
parallel
parallel/series
Extreme care should be exercised around charging batteries because a spark could
shock the technician
cause an explosion
short out the battery cell
ruin the computer
A battery hydrometer is used to measure _________ of a battery
charge level
specific gravity
electrolyte stability
chemical balance
What is the purpose of a power converter?
charge 120 VAC to 12 VAC
change 120 VAC to 12 VDC
change 12 VDC to 120 VAC
change 12 VDC to 120 VDC
Before removing and installing a power converter, the technician would
turn the branch AC circuit breaker “on”
always disconnect battery and AC power supply
always disconnect battery isolator
always short cross battery terminal (+) to ground to discharge converter filters
Inverters are rated in
kilowatts
kilowatt-hours
watts
milliwatts
When an inverter is equipped with a search mode, what is it searching for?
adequate DC voltage
demand for AC power
adequate AC voltage
demand for DC power
What is true of inverters?
most inverters are not solid state
Many inverters parts are technician-accessible
Inverters are hard to repair in the field
They have a wide range of field services available
To select the proper sized inverter, you would need to know
the size of the distribution panel
the total voltage of the components to be used
the total wattage of the components to be used
the total amperage of the components to be used
Which device keeps the batteries adequately charged to provide the necessary 12 VDC power?
isolator
inverter
alternator
rectifier
If the battery voltage with the engine off is 12.65 VDC, and once the engine is started, the battery voltage is at 14.5 VDC. This could indicate
faulty regulator
faulty alternator
loose battery cable connection
faulty rectifier
Solar power is the production of electricity when __________ strikes a photovoltaic module.
ambient temperature
a non-renewable energy source
sunlight
fuel cells
A single photovoltaic cell has the capacity to produce
120 VAC
24 volts
5 watts
0.5 volts
When connecting a solar panel, the technician must connect the solar panel
directly to the inverter
to a battery bank and then the inverter
to a battery bank, then a circuit breaker and then the inverter
to a battery bank, then a circuit breaker, then a charger, and then the inverter
When installing solar panels, the crystalline and polycrystalline units should be mounted with
at a 45 degree angle toward the sun for better efficiency
at least 1 inch of clearance under the units for air flow
flat on the roof
with 5% loss of output because of temperature
A diode is a semiconductor that passes current
in any direction
only with high voltages
only in one direction
when used as a triggering device
The purpose of a relay is to
provide circuit protection for high amp load
electrically open or close another switch
provide time delay for a high amp load
switch low amp load with high amp switch and wiring
When performing a voltage drop test across the water pump switch in the “on” position, the technician reads 12.5 volts on their meter. The technician says that the
circuit has a bad water pump
check valve is bad
switch is bad
battery needs recharging
On a ground-based ignition system, what is the normal reading on the positive terminal of the starter solenoid to ground?
12 volts DC
120 volts AC
0 volts
6 volts DC
Loose connections can cause all of the following EXCEPT
excessive heat
increased voltage
reduced amperage
intermittent operation
In a 12 VDC circuit, with a 10 amp breaker and 14-gauge wire, the technician is to add a component that will result in a total load of 13 amps. The technician should
replace the breaker with a 20-amp breaker
rewire using 16-gauge wire
replace the breaker with a 15-amp breaker
rewire using 12-gauge wire
When is it appropriate to use a standard AC receptacle to supply DC power?
in foreign coaches only
only when clearly marked for DC service
when the communing tabs have been removed on a duplex receptacle
it is never appropriate to do this
