ALBERTA HEAVY EQUIPMENT
TECHNICIAN FIRST PERIOD AIT FINAL
EXAM STUDY GUIDE QUESTIONS WITH
CORRECT ANSWERS AND
EXPLANATIONS
1. When using a micrometer, what is the specific purpose of the ratchet stop or friction
thimble?
A. To ensure consistent pressure is applied to the workpiece for accurate measurement
B. To lock the spindle in place once the measurement is taken
C. To zero the micrometer before starting a measurement sequence
D. To adjust the sleeve for temperature compensation
Answer: A
Conceptual Explanation: The ratchet stop or friction thimble prevents over-tightening
and ensures that every user applies the same amount of pressure, which is critical for
consistent and accurate readings.
2. In a WHMIS 2015 context, what does the ‘Flame over Circle’ pictogram specifically
represent?
A. Extremely flammable gases
,B. Oxidizing hazards
C. Self-reactive substances
D. Organic peroxides
Answer: B
Conceptual Explanation: The ‘Flame over Circle’ indicates oxidizing gases, liquids, or
solids, which can provide oxygen to a fire and cause it to burn more intensely.
3. A Grade 8 unified national bolt can be identified by which of the following markings on the
head?
A. Three radial lines
B. Six radial lines
C. Five radial lines
D. No markings at all
Answer: B
Conceptual Explanation: Grade 8 bolts, which offer high tensile strength, are identified by
six radial lines on the head (Grade + 2 rule).
4. Which class of fire extinguisher should be used specifically for fires involving combustible
metals like magnesium or sodium?
A. Class A
B. Class B
, C. Class D
D. Class C
Answer: C
Conceptual Explanation: Class D fire extinguishers are designed for combustible metals.
Using water or standard chemicals on these fires can cause violent reactions.
5. When storing a click-type torque wrench, why should it be adjusted to its lowest setting?
A. To ensure it is ready for the next technician to use
B. To prevent the internal spring from taking a permanent set
C. To prevent the locking mechanism from seizing
D. To allow for thermal expansion during storage
Answer: B
Conceptual Explanation: Relieving the tension on the internal spring prevents ‘spring
fatigue’ or ‘set,’ which ensures the wrench remains calibrated and accurate.
6. During the four-stroke diesel cycle, at what point does the intake valve typically close?
A. Exactly at Bottom Dead Center (BDC)
B. Slightly before Top Dead Center (TDC)
C. N/A
D. Exactly at Top Dead Center (TDC)
TECHNICIAN FIRST PERIOD AIT FINAL
EXAM STUDY GUIDE QUESTIONS WITH
CORRECT ANSWERS AND
EXPLANATIONS
1. When using a micrometer, what is the specific purpose of the ratchet stop or friction
thimble?
A. To ensure consistent pressure is applied to the workpiece for accurate measurement
B. To lock the spindle in place once the measurement is taken
C. To zero the micrometer before starting a measurement sequence
D. To adjust the sleeve for temperature compensation
Answer: A
Conceptual Explanation: The ratchet stop or friction thimble prevents over-tightening
and ensures that every user applies the same amount of pressure, which is critical for
consistent and accurate readings.
2. In a WHMIS 2015 context, what does the ‘Flame over Circle’ pictogram specifically
represent?
A. Extremely flammable gases
,B. Oxidizing hazards
C. Self-reactive substances
D. Organic peroxides
Answer: B
Conceptual Explanation: The ‘Flame over Circle’ indicates oxidizing gases, liquids, or
solids, which can provide oxygen to a fire and cause it to burn more intensely.
3. A Grade 8 unified national bolt can be identified by which of the following markings on the
head?
A. Three radial lines
B. Six radial lines
C. Five radial lines
D. No markings at all
Answer: B
Conceptual Explanation: Grade 8 bolts, which offer high tensile strength, are identified by
six radial lines on the head (Grade + 2 rule).
4. Which class of fire extinguisher should be used specifically for fires involving combustible
metals like magnesium or sodium?
A. Class A
B. Class B
, C. Class D
D. Class C
Answer: C
Conceptual Explanation: Class D fire extinguishers are designed for combustible metals.
Using water or standard chemicals on these fires can cause violent reactions.
5. When storing a click-type torque wrench, why should it be adjusted to its lowest setting?
A. To ensure it is ready for the next technician to use
B. To prevent the internal spring from taking a permanent set
C. To prevent the locking mechanism from seizing
D. To allow for thermal expansion during storage
Answer: B
Conceptual Explanation: Relieving the tension on the internal spring prevents ‘spring
fatigue’ or ‘set,’ which ensures the wrench remains calibrated and accurate.
6. During the four-stroke diesel cycle, at what point does the intake valve typically close?
A. Exactly at Bottom Dead Center (BDC)
B. Slightly before Top Dead Center (TDC)
C. N/A
D. Exactly at Top Dead Center (TDC)
