POSTAL AUTOMOTIVE TECHNICIAN EXAM 944 WITH 150
ACTUAL EXAM QUESTIONS AND 100% CORRECT ANSWERS
PLUS RATIONALES LATEST (BRAND NEW!!)
Question 1
The vibration damper on an auto engine is fastened to the:
A) Camshaft
B) Flywheel
C) Crankshaft
D) Connecting rod
E) Piston
Correct Answer: C) Crankshaft
Rationale: The vibration damper (harmonic balancer) is attached to the front of the
crankshaft to absorb torsional vibrations and reduce stress on the crankshaft.
Question 2
Most small gas engines use a _________ ignition system.
A) Distributor
B) Electronic
C) Magneto
D) Coil-on-plug
E) CDI
Correct Answer: C) Magneto
Rationale: Magneto ignition systems are self-contained and generate their own
electricity, making them common in small engines like lawnmowers and chainsaws.
Question 3
Carburetor icing occurs most often on:
,A) Hot, dry days
B) Cool, damp days
C) Freezing, sunny days
D) Warm, humid days
E) Very cold, dry days
Correct Answer: B) On cool damp days
Rationale: Icing in a carburetor is caused by the rapid expansion and cooling of air as
fuel evaporates, which is most likely to occur on cool, damp days when humidity is
high.
Question 4
The function of the float in a carburetor is to:
A) Control the airflow into the engine.
B) Atomize the fuel.
C) Close the needle valve.
D) Regulate the idle speed.
E) Open the throttle plate.
Correct Answer: C) Close the needle valve
Rationale: The float rises with the fuel level in the float bowl. When the correct level
is reached, the float pushes a needle valve closed, stopping the flow of fuel from the
fuel pump into the bowl.
Question 5
To improve stability when cornering, manufacturers added a device to cars called a:
A) Shock absorber
, B) Coil spring
C) Stabilizer bar
D) Leaf spring
E) Control arm
Correct Answer: C) Stabilizer bar
Rationale: A stabilizer bar (or sway bar) connects opposite wheels through short
lever arms and torsion springs, reducing body roll and improving stability during
cornering.
Question 6
Adjustment of the rods on a car's steering system (tie rods) will affect:
A) Camber
B) Caster
C) Toe-in
D) Kingpin inclination
E) Steering ratio
Correct Answer: C) Toe-in
Rationale: Toe-in (or toe-out) refers to the angle of the front wheels relative to each
other. Tie rods are adjusted to set the correct toe angle.
Question 7
A restriction in the exhaust system is indicated on a vacuum gauge by a:
A) High and steady reading.
B) Low and fluctuating reading.
C) Gradual decrease in reading.
ACTUAL EXAM QUESTIONS AND 100% CORRECT ANSWERS
PLUS RATIONALES LATEST (BRAND NEW!!)
Question 1
The vibration damper on an auto engine is fastened to the:
A) Camshaft
B) Flywheel
C) Crankshaft
D) Connecting rod
E) Piston
Correct Answer: C) Crankshaft
Rationale: The vibration damper (harmonic balancer) is attached to the front of the
crankshaft to absorb torsional vibrations and reduce stress on the crankshaft.
Question 2
Most small gas engines use a _________ ignition system.
A) Distributor
B) Electronic
C) Magneto
D) Coil-on-plug
E) CDI
Correct Answer: C) Magneto
Rationale: Magneto ignition systems are self-contained and generate their own
electricity, making them common in small engines like lawnmowers and chainsaws.
Question 3
Carburetor icing occurs most often on:
,A) Hot, dry days
B) Cool, damp days
C) Freezing, sunny days
D) Warm, humid days
E) Very cold, dry days
Correct Answer: B) On cool damp days
Rationale: Icing in a carburetor is caused by the rapid expansion and cooling of air as
fuel evaporates, which is most likely to occur on cool, damp days when humidity is
high.
Question 4
The function of the float in a carburetor is to:
A) Control the airflow into the engine.
B) Atomize the fuel.
C) Close the needle valve.
D) Regulate the idle speed.
E) Open the throttle plate.
Correct Answer: C) Close the needle valve
Rationale: The float rises with the fuel level in the float bowl. When the correct level
is reached, the float pushes a needle valve closed, stopping the flow of fuel from the
fuel pump into the bowl.
Question 5
To improve stability when cornering, manufacturers added a device to cars called a:
A) Shock absorber
, B) Coil spring
C) Stabilizer bar
D) Leaf spring
E) Control arm
Correct Answer: C) Stabilizer bar
Rationale: A stabilizer bar (or sway bar) connects opposite wheels through short
lever arms and torsion springs, reducing body roll and improving stability during
cornering.
Question 6
Adjustment of the rods on a car's steering system (tie rods) will affect:
A) Camber
B) Caster
C) Toe-in
D) Kingpin inclination
E) Steering ratio
Correct Answer: C) Toe-in
Rationale: Toe-in (or toe-out) refers to the angle of the front wheels relative to each
other. Tie rods are adjusted to set the correct toe angle.
Question 7
A restriction in the exhaust system is indicated on a vacuum gauge by a:
A) High and steady reading.
B) Low and fluctuating reading.
C) Gradual decrease in reading.
