NAFI EXAMS SCRIPT 2025/2026 QUESTIONS WITH
ANSWERS RATED A+
✔✔When the engine is not running, the primary source of electrical energy in a motor
vehicle is the _____________________.
a. alternator
b. distributor
c. battery
d. fuel pump - ✔✔c. battery (can also be other components)
✔✔14. When the ignition is off and the vehicle is not running, vehicle circuits having a+
12 volt potential will still supply current from ______________ to ______________.
a. battery to starter
b. battery to alternator
c. battery to ignition
d. all of the above - ✔✔d. all of the above
✔✔When the ignition is off and the vehicle is not running, vehicle circuits will still supply
current to _____________.
a. clock
b. lights
c. power door locks
d. all of the above - ✔✔d. all of the above (clock is not listed)
✔✔Protection of electrical circuits in motor vehicles is provided by:
a. fuses
b. circuitbreakers
c. fusible links
d. all of the above - ✔✔d. all of the above
✔✔Electrical problems in circuits protected by fuses cannot start a fire.
a. True
b. False - ✔✔b. False
✔✔The most common open flame in a carburated vehicle fire is:
a. lighted match
b. pilot flames or operating burners
c. catalytic converter
, d. a backfire through the carburator - ✔✔d. a backfire through the carburetor (bad
question)
✔✔There are two basic fuel systems used in gasoline powered motor vehicles:
a. vacuum/low pressure carbureted system
b. high pressure fuel injected system
c. both a & b
d. neither a or b - ✔✔c. both a & b
✔✔The flash point of gasoline is approximately _____.
a. 100* F
b. 212* F
c. -45* F
d. 25* F - ✔✔c. -45* F
✔✔Compared to gasoline, brake fluid is a higher flash point liquid.
a. True
b. False - ✔✔a. True
✔✔Gasoline will normally not ignite on a hot surface but requires a(n) __________ for
ignition.
a. arc
b. spark
c. open flame
d. any of the above - ✔✔d. any of the above
✔✔In high-pressured fuel injected systems, the fuel is typically pumped from a storage
tank under pressure of:
a. 10-15 PSI
b. 20-25 PSI
c. 35-70 PSI
d. 110-160 PSI - ✔✔c. 35-70 PSI (answer sheet says C or D)
✔✔The fuel pump will run when the ignition key is in the _______ position.
a. accessory
b. off
c. run
d. all of the above - ✔✔c. run
ANSWERS RATED A+
✔✔When the engine is not running, the primary source of electrical energy in a motor
vehicle is the _____________________.
a. alternator
b. distributor
c. battery
d. fuel pump - ✔✔c. battery (can also be other components)
✔✔14. When the ignition is off and the vehicle is not running, vehicle circuits having a+
12 volt potential will still supply current from ______________ to ______________.
a. battery to starter
b. battery to alternator
c. battery to ignition
d. all of the above - ✔✔d. all of the above
✔✔When the ignition is off and the vehicle is not running, vehicle circuits will still supply
current to _____________.
a. clock
b. lights
c. power door locks
d. all of the above - ✔✔d. all of the above (clock is not listed)
✔✔Protection of electrical circuits in motor vehicles is provided by:
a. fuses
b. circuitbreakers
c. fusible links
d. all of the above - ✔✔d. all of the above
✔✔Electrical problems in circuits protected by fuses cannot start a fire.
a. True
b. False - ✔✔b. False
✔✔The most common open flame in a carburated vehicle fire is:
a. lighted match
b. pilot flames or operating burners
c. catalytic converter
, d. a backfire through the carburator - ✔✔d. a backfire through the carburetor (bad
question)
✔✔There are two basic fuel systems used in gasoline powered motor vehicles:
a. vacuum/low pressure carbureted system
b. high pressure fuel injected system
c. both a & b
d. neither a or b - ✔✔c. both a & b
✔✔The flash point of gasoline is approximately _____.
a. 100* F
b. 212* F
c. -45* F
d. 25* F - ✔✔c. -45* F
✔✔Compared to gasoline, brake fluid is a higher flash point liquid.
a. True
b. False - ✔✔a. True
✔✔Gasoline will normally not ignite on a hot surface but requires a(n) __________ for
ignition.
a. arc
b. spark
c. open flame
d. any of the above - ✔✔d. any of the above
✔✔In high-pressured fuel injected systems, the fuel is typically pumped from a storage
tank under pressure of:
a. 10-15 PSI
b. 20-25 PSI
c. 35-70 PSI
d. 110-160 PSI - ✔✔c. 35-70 PSI (answer sheet says C or D)
✔✔The fuel pump will run when the ignition key is in the _______ position.
a. accessory
b. off
c. run
d. all of the above - ✔✔c. run
