Republic of the Philippines

DEPARTMENT OF EDUCATION
Region XII
Division of Sultan Kudarat
SEWOD NATIONAL HIGH SCHOOL
Sewod, Senator Ninoy Aquino, Sultan Kudarat
SY 2024-2025

AUTOMOTIVE SERVICING ENRICHMENT PROGRAM

Name of student: _____________________________ Date: _____________ Score:

_________

INSTRUCTION: Answer the following questions, ENCIRCLE the best answer.

1. A Spark Plug is used to ignite the fuel in a Diesel Engine.

True False
Correct Answer
False
Explanation
The given statement is false. A spark plug is not used to ignite the fuel in a diesel
engine. Unlike gasoline engines, diesel engines do not require a spark plug for ignition.
In a diesel engine, the fuel is ignited by the heat generated by the compression of the
air-fuel mixture in the combustion chamber. This is known as compression ignition.
Spark plugs are only used in gasoline engines to ignite the fuel-air mixture.

2. Which following is NOT a part of the engine assembly?

A. Intake Valve B. Crank Shaft C. Piston D. Propeller Shaft
Correct Answer
D. Propeller Shaft
Explanation
The propeller shaft is not a part of the engine assembly. The engine assembly consists
of components such as the intake valve, crankshaft, and piston, which are responsible
for the internal combustion process. The propeller shaft, on the other hand, is a part of
the drivetrain system and is responsible for transmitting power from the engine to the
propeller in a boat or aircraft.
3. Which device helps to supply the air-fuel mixture to the engine?
A. Exhaust Valve B. Carburetor C. ECU D. Spark Plug
Correct Answer
B. Carburetor
Explanation
The carburetor is the device that helps to supply the air-fuel mixture to the engine. It is
responsible for combining the right amount of fuel with air and delivering it to the engine
for combustion. The carburetor controls the fuel flow based on the engine's needs,
ensuring that the correct air-fuel ratio is maintained for optimal performance.

4. Which part of the car do the clutch, Gear, Wheels, Axle, and Shaft together form?
A. Transmission System B. Electrical System
C. Suspension System D. Steering system
Correct Answer
 A. Transmission System
Explanation
The clutch, gear, wheels, axle, and shaft are all components that are involved in the
transfer of power from the engine to the wheels of a vehicle. This system is responsible
for controlling the speed and torque of the wheels, allowing the driver to change gears
and control the vehicle's movement. Therefore, the correct answer is Transmission
System.

5. Ignition coils are basically:

A. Step-down transformers. B. Step-up transformers.
C. Ballast resistors D. Switching transistors.
Correct Answer
Step-up transformers.
Explanation
Ignition coils are devices used in the ignition system of internal combustion engines to
convert the low voltage from the battery into the high voltage needed to create a spark in
the spark plugs. They achieve this by utilizing the principle of electromagnetic induction,
where a changing current in the primary coil induces a high voltage in the secondary
coil. This process involves stepping up the voltage, making ignition coils function as
step-up transformers.
6. high-voltage spark must cross the spark plug electrode as the piston approaches top dead
center (TDC) of the
A. Exhaust stroke. B. Ignition stroke.
C. Intake stroke. D. Compression stroke.
Correct Answer
Compression stroke.
Explanation
A spark plug must create a high-voltage spark to ignite the compressed air-fuel mixture
in the cylinder. This occurs as the piston reaches top dead center (TDC) during the
compression stroke. This ignition causes combustion, which forces the piston down,
powering the engine. The spark is not needed during the exhaust, intake, or ignition
strokes.
7. When the driver turns the key to the start position, an electrical connection is made between
the vehicle battery and the ____________ of the ignition coil.
A. Secondary winding B. Ballast resistor
C. Primary winding D. Distributor
Correct Answer
Primary winding
Explanation
When the driver turns the key to the start position, an electrical connection is made
between the vehicle battery and the primary winding of the ignition coil. The primary
winding is responsible for receiving the electrical current from the battery and creating a
magnetic field. This magnetic field is then used to induce a higher voltage in the
secondary winding of the ignition coil, which is connected to the spark plugs. This higher
voltage is necessary for creating the spark that ignites the fuel-air mixture in the engine
cylinders, allowing the engine to start and run.
8. The component the ignition system uses to convert low voltage and high current into high
voltage and low current is called the:
A. Ballast resistor. B. Advance mechanism.
C. Condenser. D. Induction coil.
Correct Answer
 D. Induction coil.
Explanation
The ignition system in a vehicle needs to convert the low voltage and high current from
the battery into high voltage and low current to create a spark for the combustion
process. The component responsible for this conversion is the induction coil. The
induction coil uses electromagnetic induction to step up the voltage and reduce the
current, allowing for the creation of a high-energy spark. The other options, such as the
ballast resistor, advance mechanism, and condenser, do not perform this specific
function in the ignition system.
9. The amount of voltage needed to initially get the spark to jump the spark plug gap is called
the:
A. Available voltage. B. Required voltage.
C. Induced voltage. D. None of the above

Correct Answer
B. Required voltage.
Explanation
The correct answer is "required voltage" because it refers to the specific amount of
voltage that is necessary to create a spark and jump the spark plug gap. This voltage is
essential for the ignition process to occur in an internal combustion engine. The other
options, such as "available voltage" and "induced voltage," do not accurately describe
the specific voltage needed for this purpose
10. As engine rpm increases, the ignition timing must:
A. Retard. B. Advance.
C. Remain the same. D. Remain the same and then retard.
Correct Answer
B. Advance.
Explanation
As engine rpm increases, the ignition timing must advance. This is because at higher
engine speeds, the air-fuel mixture needs to be ignited earlier in the compression stroke
to ensure optimal combustion and power delivery. Advancing the ignition timing allows
for a more efficient and complete combustion process, maximizing engine performance.
11. The hottest part of the spark plug is the:
A. Ground electrode. B. Insulator.
C. Center electrode. D. Metal shell.
Correct Answer
C. Center electrode.
Explanation
The center electrode is the hottest part of the spark plug because it is the part that
receives the electrical current from the ignition system and generates the spark. As the
electrical current passes through the center electrode, it creates a high level of heat due
to the resistance of the metal. This heat is essential for igniting the air-fuel mixture in the
engine's combustion chamber. The ground electrode, insulator, and metal shell also play
important roles in the spark plug's function, but they do not generate as much heat as
the center electrode.
12. The transmission system transmits _________ from engine to wheels.
a) Speed b) Power c) Current d) Pressure
View Answer
Answer: b
Explanation: Power from engine to wheels cannot be directly transmitted. So the
transmission system transmits the power from engine to wheels in a very controlled
 manner. Generally, the transmission system consists of gears which provides different
types of gear ratios.
13. Which of the following is not a part of the transmission system?
a) Clutch b) Axles c) Wheels d) Gear box
View Answer
Answer: c
Explanation: Transmission system is used to transmit the power from engine to wheels.
Transmission system consists of gears, and clutches to transmit the power at different
gear ratios. Wheels are considered as a part of the automobile chassis.
14. The loads supported by an automobile frame are _____
a) Weight of the body, passengers and cargo loads
b) Torque from engine and transmission
c) Sudden impacts from collisions
d) All of the mentioned
View Answer
15. An automobile chassis does not include which one of the following parts?
a) Shock absorbers b) Steering system
c) Differential d) Brakes
View Answer
Answer: c
Explanation: A ‘differential’ is a component of the transmission system. Differential
provides different speed to both of the wheels. Due to this, the skidding of the wheels
are prevented.
16. The electrical system of an automobile contains which of the following?
a) Battery b) Alternators c) Lighting systems d) All of the mentioned
View Answer
Answer: d
Explanation: Battery, alternators and lighting systems are the major electrical
components of an automobile
17. Why ‘Bumpers’ are used in cars?
a) To reduce the impact in case of low speed collisions
b) To improve the aerodynamics of a car
c) To increase the engine performance
d) None of the mentioned
View Answer
Answer: a
Explanation: Bumpers reduce the impact of collision and save the passengers from
getting injured.
18. The central portion of the wheel is called _______
a) Rim b) Scale c) Hub d) Axle
View Answer
Answer: c
Explanation: The central portion of the wheel is called ‘hub’.
19. A _____ is a horizontal surface at the back of a car and serves as a lid to the trunk.
a) Trunk top b) Deck c) Hood d) Backlight
Answer: b
Explanation: The component that serves as a lid on the trunk is called ‘Deck’.
20. A ‘bucket seat’ can accommodate how many persons?
a) One b) Two c) Four d) None of the mentioned
Answer: b
 Explanation: Head restraints are safety features that protect the vertebral column of the
passengers during collisions.
21. Which of the following isn’t a cylinder block part?
a) carburetor
b) cylinder in which piston slides up and down
c) openings for valves
d) passages for the flow of cooling water
View Answer
Answer: a
Explanation: Carburetor isn’t a part of cylinder block it is used for a mixture of fuel and
air and then allowed to the intake port.
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