Michigan Small Engine Repair
Technician Exam Questions and Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. What is the primary function of the carburetor in a small engine?
A. To ignite the fuel
B. To regulate engine temperature
C. To mix air and fuel in the proper ratio
D. To lubricate moving parts
C. To mix air and fuel in the proper ratio
The carburetor ensures that the engine receives the correct air-to-fuel
mixture for combustion, which is critical for proper engine operation
and efficiency.
, 2. Which type of engine is most commonly used in lawn mowers and
generators?
A. Two-stroke gasoline engine
B. Four-stroke gasoline engine
C. Diesel engine
D. Electric motor
B. Four-stroke gasoline engine
Four-stroke engines are favored in lawn equipment due to their
efficiency, lower emissions, and smoother operation compared to two-
stroke engines.
3. What component is responsible for initiating combustion in a
spark-ignition small engine?
A. Piston
B. Spark plug
C. Carburetor
D. Fuel pump
B. Spark plug
The spark plug produces an electric spark that ignites the compressed
fuel-air mixture, enabling the engine to generate power.
4. What is the effect of a clogged air filter on engine performance?
A. Increased fuel efficiency
, B. Reduced air flow leading to poor combustion
C. Improved engine power
D. No effect on the engine
B. Reduced air flow leading to poor combustion
A dirty or clogged air filter restricts air flow, causing the engine to run
rich (too much fuel), resulting in reduced power, higher fuel
consumption, and potential carbon buildup.
5. Which oil viscosity is typically recommended for most small four-
stroke engines?
A. SAE 10W-30
B. SAE 5W-20
C. SAE 30 only
D. SAE 50 only
A. SAE 10W-30
10W-30 provides good lubrication over a wide temperature range,
protecting engine components from wear while maintaining
performance in various climates.
6. What is the primary purpose of a flywheel in a small engine?
A. To cool the engine
B. To store rotational energy and maintain smooth engine
operation
, C. To deliver fuel to the cylinder
D. To regulate oil flow
B. To store rotational energy and maintain smooth engine operation
The flywheel helps maintain momentum between power strokes and
stabilizes engine speed, ensuring smooth operation.
7. Which of the following can cause engine overheating?
A. Low fuel level
B. Dirty air filter or clogged cooling fins
C. Using SAE 10W-30 oil
D. High octane fuel
B. Dirty air filter or clogged cooling fins
Restricted air flow reduces cooling efficiency and increases operating
temperature, which can lead to engine damage.
8. In a two-stroke engine, how often does the piston complete a
power stroke?
A. Every one crankshaft revolution
B. Every two crankshaft revolutions
C. Every three crankshaft revolutions
D. Every four crankshaft revolutions
A. Every one crankshaft revolution
Two-stroke engines complete a power stroke on every revolution,
Technician Exam Questions and Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary function of the carburetor in a small engine?
A. To ignite the fuel
B. To regulate engine temperature
C. To mix air and fuel in the proper ratio
D. To lubricate moving parts
C. To mix air and fuel in the proper ratio
The carburetor ensures that the engine receives the correct air-to-fuel
mixture for combustion, which is critical for proper engine operation
and efficiency.
, 2. Which type of engine is most commonly used in lawn mowers and
generators?
A. Two-stroke gasoline engine
B. Four-stroke gasoline engine
C. Diesel engine
D. Electric motor
B. Four-stroke gasoline engine
Four-stroke engines are favored in lawn equipment due to their
efficiency, lower emissions, and smoother operation compared to two-
stroke engines.
3. What component is responsible for initiating combustion in a
spark-ignition small engine?
A. Piston
B. Spark plug
C. Carburetor
D. Fuel pump
B. Spark plug
The spark plug produces an electric spark that ignites the compressed
fuel-air mixture, enabling the engine to generate power.
4. What is the effect of a clogged air filter on engine performance?
A. Increased fuel efficiency
, B. Reduced air flow leading to poor combustion
C. Improved engine power
D. No effect on the engine
B. Reduced air flow leading to poor combustion
A dirty or clogged air filter restricts air flow, causing the engine to run
rich (too much fuel), resulting in reduced power, higher fuel
consumption, and potential carbon buildup.
5. Which oil viscosity is typically recommended for most small four-
stroke engines?
A. SAE 10W-30
B. SAE 5W-20
C. SAE 30 only
D. SAE 50 only
A. SAE 10W-30
10W-30 provides good lubrication over a wide temperature range,
protecting engine components from wear while maintaining
performance in various climates.
6. What is the primary purpose of a flywheel in a small engine?
A. To cool the engine
B. To store rotational energy and maintain smooth engine
operation
, C. To deliver fuel to the cylinder
D. To regulate oil flow
B. To store rotational energy and maintain smooth engine operation
The flywheel helps maintain momentum between power strokes and
stabilizes engine speed, ensuring smooth operation.
7. Which of the following can cause engine overheating?
A. Low fuel level
B. Dirty air filter or clogged cooling fins
C. Using SAE 10W-30 oil
D. High octane fuel
B. Dirty air filter or clogged cooling fins
Restricted air flow reduces cooling efficiency and increases operating
temperature, which can lead to engine damage.
8. In a two-stroke engine, how often does the piston complete a
power stroke?
A. Every one crankshaft revolution
B. Every two crankshaft revolutions
C. Every three crankshaft revolutions
D. Every four crankshaft revolutions
A. Every one crankshaft revolution
Two-stroke engines complete a power stroke on every revolution,
