ALBERTA HEAVY EQUIPMENT
TECHNICIAN FIRST PERIOD AIT FINAL
EXAM QUESTIONS WITH CORRECT
ANSWERS AND EXPLANATIONS
1. When using a dial indicator to check flywheel housing runout, what does a total indicator
reading (TIR) of 0.012 inches represent?
A. The housing is off-center by 0.006 inches.
B. The housing is off-center by 0.012 inches.
C. The face is warped by 0.024 inches.
D. The eccentricity is 0.024 inches.
Answer: A
Conceptual Explanation: TIR represents the total movement; the actual misalignment
from the center is half of the TIR.
2. Which type of fire extinguisher is specifically designed for use on combustible metal fires,
such as magnesium?
A. Class D
B. Class B
C. Class A
,D. Class K
Answer: A
Conceptual Explanation: Class D fire extinguishers are used for combustible metals.
3. A bolt head is marked with six radial lines. What is the SAE grade of this bolt?
A. Grade 2
B. Grade 5
C. Grade 8
D. Grade 9
Answer: C
Conceptual Explanation: The number of lines plus 2 equals the SAE grade (6 + 2 = 8).
4. In a series circuit with three 10-ohm resistors and a 12-volt source, what is the total current
flow?
A. 1.2 Amps
B. 0.4 Amps
C. 3.6 Amps
D. 30 Amps
Answer: B
, Conceptual Explanation: Total resistance is 30 ohms (10+10+10). I = V/R = 12/30 = 0.4
Amps.
5. According to Pascal’s Law, if pressure is applied to a confined liquid, how is the pressure
transmitted?
A. Inverse to the area of the piston.
B. More at the bottom than the top.
C. In the direction of flow only.
D. Equally in all directions.
Answer: D
Conceptual Explanation: Pascal’s Law states that pressure applied to a confined fluid is
transmitted undiminished in all directions.
6. What is the purpose of the ‘land’ on a piston?
A. To separate the ring grooves.
B. To house the piston pin.
C. To provide cooling oil drainage.
D. To support the cylinder liner.
Answer: A
Conceptual Explanation: The lands are the solid metal sections between the ring grooves
on a piston.
TECHNICIAN FIRST PERIOD AIT FINAL
EXAM QUESTIONS WITH CORRECT
ANSWERS AND EXPLANATIONS
1. When using a dial indicator to check flywheel housing runout, what does a total indicator
reading (TIR) of 0.012 inches represent?
A. The housing is off-center by 0.006 inches.
B. The housing is off-center by 0.012 inches.
C. The face is warped by 0.024 inches.
D. The eccentricity is 0.024 inches.
Answer: A
Conceptual Explanation: TIR represents the total movement; the actual misalignment
from the center is half of the TIR.
2. Which type of fire extinguisher is specifically designed for use on combustible metal fires,
such as magnesium?
A. Class D
B. Class B
C. Class A
,D. Class K
Answer: A
Conceptual Explanation: Class D fire extinguishers are used for combustible metals.
3. A bolt head is marked with six radial lines. What is the SAE grade of this bolt?
A. Grade 2
B. Grade 5
C. Grade 8
D. Grade 9
Answer: C
Conceptual Explanation: The number of lines plus 2 equals the SAE grade (6 + 2 = 8).
4. In a series circuit with three 10-ohm resistors and a 12-volt source, what is the total current
flow?
A. 1.2 Amps
B. 0.4 Amps
C. 3.6 Amps
D. 30 Amps
Answer: B
, Conceptual Explanation: Total resistance is 30 ohms (10+10+10). I = V/R = 12/30 = 0.4
Amps.
5. According to Pascal’s Law, if pressure is applied to a confined liquid, how is the pressure
transmitted?
A. Inverse to the area of the piston.
B. More at the bottom than the top.
C. In the direction of flow only.
D. Equally in all directions.
Answer: D
Conceptual Explanation: Pascal’s Law states that pressure applied to a confined fluid is
transmitted undiminished in all directions.
6. What is the purpose of the ‘land’ on a piston?
A. To separate the ring grooves.
B. To house the piston pin.
C. To provide cooling oil drainage.
D. To support the cylinder liner.
Answer: A
Conceptual Explanation: The lands are the solid metal sections between the ring grooves
on a piston.
