ALBERTA HEAVY EQUIPMENT
TECHNICIAN FIRST PERIOD AIT EXAM
2026/2027 QUESTIONS WITH CORRECT
ANSWERS AND EXPLANATIONS
1. When using a micrometer, what is the purpose of the ratchet stop or friction thimble?
A. To lock the spindle in place for easier reading
B. To ensure consistent pressure is applied to the workpiece
C. To zero the tool before measurement
D. To speed up the opening and closing of the spindle
Answer: B
Conceptual Explanation: The ratchet stop or friction thimble ensures that the same
amount of pressure is applied for every measurement, preventing over-tightening which
leads to inaccurate readings and tool damage.
2. A bolt marked with three radial lines on its head belongs to which SAE grade?
A. Grade 5
B. Grade 8
C. Grade 2
D. Grade 9
,Answer: A
Conceptual Explanation: SAE Grade 5 bolts are identified by three radial lines on the
head. Grade 8 has six lines, and Grade 2 has no markings.
3. Which law of physics states that pressure applied to a confined fluid is transmitted
undiminished in all directions?
A. Ohm’s Law
B. Pascal’s Law
C. Bernoulli’s Principle
D. Boyle’s Law
Answer: B
Conceptual Explanation: Pascal’s Law is the fundamental principle of hydraulics, stating
that pressure exerted anywhere in a confined incompressible fluid is transmitted equally in
all directions.
4. In a four-stroke diesel engine, at what point does the intake valve typically close?
A. Exactly at Bottom Dead Center (BDC)
B. Shortly after Bottom Dead Center (BDC)
C. Shortly before Bottom Dead Center (BDC)
D. Exactly at Top Dead Center (TDC)
Answer: B
, Conceptual Explanation: Intake valves usually close after BDC (Bottom Dead Center) to
take advantage of the inertia of the incoming air, improving volumetric efficiency.
5. What is the result of connecting two 12-volt batteries in parallel?
A. 12 volts and double the CCA capacity
B. 24 volts and the same CCA capacity as one battery
C. 24 volts and double the CCA capacity
D. 6 volts and double the CCA capacity
Answer: A
Conceptual Explanation: Parallel connections increase the current (Amperage/CCA)
while the voltage remains the same as a single battery (12V).
6. Which type of fire extinguisher is specifically designed for use on combustible metals such
as magnesium?
A. Class D
B. Class B
C. Class C
D. Class A
Answer: A
Conceptual Explanation: Class D fire extinguishers are used for combustible metals. Class
A is for wood/paper, B for liquids, and C for electrical fires.
TECHNICIAN FIRST PERIOD AIT EXAM
2026/2027 QUESTIONS WITH CORRECT
ANSWERS AND EXPLANATIONS
1. When using a micrometer, what is the purpose of the ratchet stop or friction thimble?
A. To lock the spindle in place for easier reading
B. To ensure consistent pressure is applied to the workpiece
C. To zero the tool before measurement
D. To speed up the opening and closing of the spindle
Answer: B
Conceptual Explanation: The ratchet stop or friction thimble ensures that the same
amount of pressure is applied for every measurement, preventing over-tightening which
leads to inaccurate readings and tool damage.
2. A bolt marked with three radial lines on its head belongs to which SAE grade?
A. Grade 5
B. Grade 8
C. Grade 2
D. Grade 9
,Answer: A
Conceptual Explanation: SAE Grade 5 bolts are identified by three radial lines on the
head. Grade 8 has six lines, and Grade 2 has no markings.
3. Which law of physics states that pressure applied to a confined fluid is transmitted
undiminished in all directions?
A. Ohm’s Law
B. Pascal’s Law
C. Bernoulli’s Principle
D. Boyle’s Law
Answer: B
Conceptual Explanation: Pascal’s Law is the fundamental principle of hydraulics, stating
that pressure exerted anywhere in a confined incompressible fluid is transmitted equally in
all directions.
4. In a four-stroke diesel engine, at what point does the intake valve typically close?
A. Exactly at Bottom Dead Center (BDC)
B. Shortly after Bottom Dead Center (BDC)
C. Shortly before Bottom Dead Center (BDC)
D. Exactly at Top Dead Center (TDC)
Answer: B
, Conceptual Explanation: Intake valves usually close after BDC (Bottom Dead Center) to
take advantage of the inertia of the incoming air, improving volumetric efficiency.
5. What is the result of connecting two 12-volt batteries in parallel?
A. 12 volts and double the CCA capacity
B. 24 volts and the same CCA capacity as one battery
C. 24 volts and double the CCA capacity
D. 6 volts and double the CCA capacity
Answer: A
Conceptual Explanation: Parallel connections increase the current (Amperage/CCA)
while the voltage remains the same as a single battery (12V).
6. Which type of fire extinguisher is specifically designed for use on combustible metals such
as magnesium?
A. Class D
B. Class B
C. Class C
D. Class A
Answer: A
Conceptual Explanation: Class D fire extinguishers are used for combustible metals. Class
A is for wood/paper, B for liquids, and C for electrical fires.
