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UTI AUTO/DIESEL 101 END OF COURSE EXAM QUESTIONS AND ANSWERS 100% PASS $11.49
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UTI AUTO/DIESEL 101 END OF COURSE EXAM QUESTIONS AND ANSWERS 100% PASS
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UTI AUTO/DIESEL 101 END OF COURSE EXAM QUESTIONS AND ANSWERS 100% PASS What are the events that take place in an engine? - Intake, Compression, Power (Combustion), Exhaust How fast does the camshaft turn in relation to the crankshaft? - Camshaft turns once for every 2 turns of the crankshaft (...

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  • December 22, 2024
  • 6
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • uti autodiesel 101 end of course exam questions a

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  • AUT 101-120
  • AUT 101-120

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UTI AUTO/DIESEL 101 END OF COURSE EXAM
QUESTIONS AND ANSWERS 100% PASS


What are the events that take place in an engine? - ✔✔Intake, Compression, Power (Combustion),

Exhaust


How fast does the camshaft turn in relation to the crankshaft? - ✔✔Camshaft turns once for every 2 turns

of the crankshaft (this is achieved through gear reduction).


Do all engines have companion cylinders? Which ones don't? - ✔✔No, engines with odd number of

cylinders do not have companion cylinders.


How many rotations of the crankshaft are needed to complete the 4-stroke cycle? A 2-stroke cycle? - ✔✔2

rotations of the crankshaft are needed to complete a 4-stroke cycle. 1 rotation of the crankshaft is needed

to complete a 2-stroke cycle.


How do the wax pellets in the thermostat work? What closes the thermostat? - ✔✔The expansive wax in

the thermostat expands at a predictable rate when heated to open the valve in the the thermostat. The

spring in the thermostat will close when at room temperature.


How does the thermostat control the coolant flow? Why is this important? - ✔✔When the engine is cold,

the thermostat remains closed trapping the coolant in the block. When the coolant temperature in the

block reaches a rated temperature the thermostat gradually opens and allows the coolant to flow to the

radiator where it is cooled. This is important so the coolant temperature and the engine maintain a safe

operating temperature.


Define compression ratio. What factors affect an engine's compression ratio? - ✔✔The compression ratio

is the comparison between the volume of the cylinder and the volume of the combustion chamber when


Created by Katelyn Whitman © 2025, All Rights Reserved.

, 2|Page


the piston is at TDC and BDC. The factors that affect an engine's compression ratio are: bore size, stroke,

deck height volume, combustion chamber volume, and piston shape.


What is the approximate thermal efficiency of an engine? Mechanical? Practical? - ✔✔33% / 90% / 15%


In a 2-stroke engine when does the power stroke begin? - ✔✔At TDC when the sparkplug ignites the

air/fuel mixture.


What could be wrong with the block if it was going to be align bored? - ✔✔The main bores have too

much taper or OOR or both.


What part of the bearing is the softest? What is this part's job? How does it accomplish this? - ✔✔The

bearing lining is the softest part of the bearing. This is so that the bearing has embeddability, which

allows it to absorb debris, so that the bearing doesn't loose clearance.


When would a technician use a rigid spring hone? A flex ball hone? - ✔✔If the cylinder wall has some

light scoring the rigid spring hone could refinish the cylinder wall. The flex ball hone is used to

crosshatch the cylinder wall.


What is a crosshatch pattern? What approximate degree angle is best? Why is this angle best? -

✔✔Crosshatch along the cylinder walls allows oil to stick to the cylinders allowing the piston rings to

create a seal in the cylinder. 20-60 degrees works best; less than 20 allows oil to run too quick and more

than 60 creates a thick layer.


Define friction bearing. Define anti-friction bearing. - ✔✔A friction bearing uses oil passages to create

clearance with oil pressure; an anti-friction bearing uses steel balls, rollers, or pins to allow movement

between two parts.


Describe the procedure of disassembling an engine to ensure proper reassembly. - ✔✔Mark and label

parts for orientation and order.




Created by Katelyn Whitman © 2025, All Rights Reserved.

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