ALBERTA HEAVY EQUIPMENT
TECHNICIAN FIRST PERIOD AIT EXAM
2026/2027 QUESTIONS WITH CORRECT
ANSWERS AND EXPLANATIONS
1. Which class of fire extinguisher is specifically designed to combat electrical fires?
A. Class A
B. Class B
C. Class C
D. Class D
Answer: C
Conceptual Explanation: Class C extinguishers are used for energized electrical
equipment fires. Class A is for ordinary combustibles, Class B for flammable liquids, and
Class D for combustible metals.
2. A Grade 8 metric bolt is identified by which of the following markings on its head?
A. Three radial lines
B. The numbers 10.9
C. The numbers 8.8
D. Six radial lines
,Answer: B
Conceptual Explanation: In the metric system, a 10.9 marking indicates a high-strength
bolt roughly equivalent to a Grade 8 SAE bolt. 8.8 is equivalent to Grade 5.
3. What is the primary purpose of a cylinder liner’s cross-hatch pattern?
A. To reduce the overall weight of the engine block
B. To aid in the retention of lubricating oil
C. To facilitate the cooling of the piston rings
D. To increase the compression ratio of the cylinder
Answer: B
Conceptual Explanation: The cross-hatch pattern is designed to hold a thin film of oil on
the cylinder wall to lubricate the piston rings and prevent metal-to-metal contact.
4. In a four-stroke diesel engine, at which point do both valves typically remain closed?
A. During the entire exhaust stroke
B. During the intake stroke
C. During the valve overlap period
D. During the power stroke
Answer: D
, Conceptual Explanation: During the power stroke (and most of the compression stroke),
both the intake and exhaust valves must be closed to contain the high-pressure gases.
5. According to Pascal’s Law, what happens to pressure applied to a confined fluid?
A. It is transmitted equally in all directions
B. It increases as the fluid moves further from the source
C. It decreases proportionally to the volume of the container
D. It is only transmitted in the direction of the flow
Answer: A
Conceptual Explanation: Pascal’s Law states that pressure applied to a confined fluid is
transmitted undiminished and equally in all directions throughout the fluid.
6. Which tool is most appropriate for measuring the crankshaft end play?
A. Inside micrometer
B. Feeler gauge
C. Dial indicator
D. Telescoping gauge
Answer: C
Conceptual Explanation: A dial indicator is used to measure the axial movement (end
play) of a shaft by referencing a stationary point on the block.
TECHNICIAN FIRST PERIOD AIT EXAM
2026/2027 QUESTIONS WITH CORRECT
ANSWERS AND EXPLANATIONS
1. Which class of fire extinguisher is specifically designed to combat electrical fires?
A. Class A
B. Class B
C. Class C
D. Class D
Answer: C
Conceptual Explanation: Class C extinguishers are used for energized electrical
equipment fires. Class A is for ordinary combustibles, Class B for flammable liquids, and
Class D for combustible metals.
2. A Grade 8 metric bolt is identified by which of the following markings on its head?
A. Three radial lines
B. The numbers 10.9
C. The numbers 8.8
D. Six radial lines
,Answer: B
Conceptual Explanation: In the metric system, a 10.9 marking indicates a high-strength
bolt roughly equivalent to a Grade 8 SAE bolt. 8.8 is equivalent to Grade 5.
3. What is the primary purpose of a cylinder liner’s cross-hatch pattern?
A. To reduce the overall weight of the engine block
B. To aid in the retention of lubricating oil
C. To facilitate the cooling of the piston rings
D. To increase the compression ratio of the cylinder
Answer: B
Conceptual Explanation: The cross-hatch pattern is designed to hold a thin film of oil on
the cylinder wall to lubricate the piston rings and prevent metal-to-metal contact.
4. In a four-stroke diesel engine, at which point do both valves typically remain closed?
A. During the entire exhaust stroke
B. During the intake stroke
C. During the valve overlap period
D. During the power stroke
Answer: D
, Conceptual Explanation: During the power stroke (and most of the compression stroke),
both the intake and exhaust valves must be closed to contain the high-pressure gases.
5. According to Pascal’s Law, what happens to pressure applied to a confined fluid?
A. It is transmitted equally in all directions
B. It increases as the fluid moves further from the source
C. It decreases proportionally to the volume of the container
D. It is only transmitted in the direction of the flow
Answer: A
Conceptual Explanation: Pascal’s Law states that pressure applied to a confined fluid is
transmitted undiminished and equally in all directions throughout the fluid.
6. Which tool is most appropriate for measuring the crankshaft end play?
A. Inside micrometer
B. Feeler gauge
C. Dial indicator
D. Telescoping gauge
Answer: C
Conceptual Explanation: A dial indicator is used to measure the axial movement (end
play) of a shaft by referencing a stationary point on the block.
