ALBERTA HEAVY EQUIPMENT
TECHNICIAN FIRST PERIOD AIT EXAM
QUESTIONS WITH CORRECT ANSWERS
AND EXPLANATIONS
1. According to Pascal’s Law, what happens to pressure applied to a confined fluid?
A. It increases as the fluid moves further from the source
B. It only acts in the direction of the flow
C. It decreases as it acts on larger surface areas
D. It is transmitted equally in all directions throughout the fluid
Answer: D
Conceptual Explanation: Pascal’s Law states that pressure applied to a confined fluid is
transmitted undiminished in all directions and acts with equal force on equal areas.
2. When using a standard outside micrometer, one full revolution of the thimble moves the
spindle exactly how far?
A. 0.001 inch
B. 0.025 inch
C. 0.100 inch
D. 0.500 inch
,Answer: B
Conceptual Explanation: For a standard inch micrometer, the spindle thread has 40
threads per inch, so one revolution (1/40) equals 0.025 inches.
3. In a four-stroke cycle diesel engine, at what point does the fuel injection typically begin?
A. Near the end of the compression stroke
B. At the start of the exhaust stroke
C. At the bottom of the intake stroke
D. At the end of the power stroke
Answer: A
Conceptual Explanation: Fuel injection occurs near the end of the compression stroke,
slightly before Top Dead Center (TDC), to allow time for ignition delay.
4. Which electrical law states that the total current entering a junction must equal the total
current leaving the junction?
A. Kirchhoff’s Current Law
B. Watt’s Law
C. Ohm’s Law
D. Lenz’s Law
Answer: A
, Conceptual Explanation: Kirchhoff’s Current Law (KCL) states that the sum of currents
entering a node is equal to the sum of currents leaving that node.
5. What is the purpose of the ‘thermostat’ in a heavy-duty engine cooling system?
A. To turn on the cooling fans when the engine is hot
B. To regulate the engine operating temperature by controlling coolant flow
C. To monitor the coolant level in the radiator
D. To increase the boiling point of the coolant
Answer: B
Conceptual Explanation: The thermostat maintains the engine at its optimum operating
temperature by restricting coolant flow to the radiator until the engine warms up.
6. What is the primary function of a turbocharger on a diesel engine?
A. To reduce the temperature of the exhaust gases
B. To increase the density of the air entering the cylinders
C. To lubricate the upper cylinder walls
D. To cool the intake air via an air-to-air heat exchanger
Answer: B
Conceptual Explanation: A turbocharger uses exhaust energy to compress intake air,
increasing its density and allowing more fuel to be burned for more power.
TECHNICIAN FIRST PERIOD AIT EXAM
QUESTIONS WITH CORRECT ANSWERS
AND EXPLANATIONS
1. According to Pascal’s Law, what happens to pressure applied to a confined fluid?
A. It increases as the fluid moves further from the source
B. It only acts in the direction of the flow
C. It decreases as it acts on larger surface areas
D. It is transmitted equally in all directions throughout the fluid
Answer: D
Conceptual Explanation: Pascal’s Law states that pressure applied to a confined fluid is
transmitted undiminished in all directions and acts with equal force on equal areas.
2. When using a standard outside micrometer, one full revolution of the thimble moves the
spindle exactly how far?
A. 0.001 inch
B. 0.025 inch
C. 0.100 inch
D. 0.500 inch
,Answer: B
Conceptual Explanation: For a standard inch micrometer, the spindle thread has 40
threads per inch, so one revolution (1/40) equals 0.025 inches.
3. In a four-stroke cycle diesel engine, at what point does the fuel injection typically begin?
A. Near the end of the compression stroke
B. At the start of the exhaust stroke
C. At the bottom of the intake stroke
D. At the end of the power stroke
Answer: A
Conceptual Explanation: Fuel injection occurs near the end of the compression stroke,
slightly before Top Dead Center (TDC), to allow time for ignition delay.
4. Which electrical law states that the total current entering a junction must equal the total
current leaving the junction?
A. Kirchhoff’s Current Law
B. Watt’s Law
C. Ohm’s Law
D. Lenz’s Law
Answer: A
, Conceptual Explanation: Kirchhoff’s Current Law (KCL) states that the sum of currents
entering a node is equal to the sum of currents leaving that node.
5. What is the purpose of the ‘thermostat’ in a heavy-duty engine cooling system?
A. To turn on the cooling fans when the engine is hot
B. To regulate the engine operating temperature by controlling coolant flow
C. To monitor the coolant level in the radiator
D. To increase the boiling point of the coolant
Answer: B
Conceptual Explanation: The thermostat maintains the engine at its optimum operating
temperature by restricting coolant flow to the radiator until the engine warms up.
6. What is the primary function of a turbocharger on a diesel engine?
A. To reduce the temperature of the exhaust gases
B. To increase the density of the air entering the cylinders
C. To lubricate the upper cylinder walls
D. To cool the intake air via an air-to-air heat exchanger
Answer: B
Conceptual Explanation: A turbocharger uses exhaust energy to compress intake air,
increasing its density and allowing more fuel to be burned for more power.
