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Agricultural Mechanics Pretest for SLO

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

What is an amp?
a.
The rate of doing or converting work.
c.
The flow of electrons through a substance.
b.
A measure of the rate of flow of electricity
d.
I don’t know.
 

 2. 

What is resistance?
a.
The rate of doing or converting work.
c.
The friction that impedes the current in a substance.
b.
The flow of elctrons from one atom to another.
d.
I don’t know.
 

 3. 

What is the definition of electricity?
a.
The flow of electrons from one atom to another.
c.
A small unit of energy that is used to designate the capacity for doing work.
b.
The flow of electrons through a substance.
d.
I don’t know.
 

 4. 

What are the four cycles or stokes of a four cycle engine in their proper order?
a.
Combustion, compression, power and exhaust
c.
Intake, compression, combustion and exhaust
b.
Intake, compression, power and exhaust
d.
I don’t know.
 

 5. 

What are the three valves on a Briggs and Stratton 3.5 Horsepower engine?
a.
1 Intake valve, 1 compression valve and 1 exhaust valve
c.
2 compression valves and 1 oil valve
b.
1 oil valve and two intake valves
d.
I don’t know.
 

 6. 

How can you determine if a smal engine is in the proper timing?
a.
By alligning the timing marks on the crankshaft and the camshaft.
c.
By alligning the timing marks on the crankshaft and the piston.
b.
By testing the engine with a timing gun to ensure the correct timing
d.
I don’t know.
 

 7. 

What is polarity?
a.
the flow of the electricity through the piece to be welded.
c.
The direction in which the current flows across the arc.
b.
The tensile strength of the electrode metal to be used.
d.
I don’t know
 

 8. 

What is the definition of welding?
a.
The process of joining together metal with electricity and a welding machine.
c.
The process approved by the American Welding Society to join carbon steel to mild steel.
b.
The fusing of two like substances together with heat.
d.
I don’t know.
 

 9. 

When associated with welding, what does AC mean?
a.
Alternating Current
c.
Advancing Current
b.
Accelerating Current
d.
I don’t know
 

 10. 

What is the definition of plumbing?
a.
All of the piping and metal fixtures in a structure that are associated with the water system and plumbing in that sctructure.
c.
All pipes and drains that are used to accuate the flow of water in a structure.
b.
All of the piping and fixtures that provide water for drinking, cooking, bathing and laundry as well as a means of disposing of wastewater.
d.
I don’t know.
 

 11. 

When associated with plumbing, what does PVC mean?
a.
Polypropeline Caltrate
c.
Polyvinyl Chloride
b.
Plastic Cast
d.
I don’t know.
 

 12. 

When associated with plumbing, what is a ferrule?
a.
A short tube or bushing used for tightening a joint.
c.
A device used for pressurized cold water and venting applications.
b.
Those fittings containing a device that regulates the flow or permits the flow of a substance in one direction.
d.
I don’t know.
 

 13. 

What is the proper spacing for the studs in a common house wall?
a.
18 OC
c.
Every 24 inches.
b.
16 OC
d.
I don’t know.
 

 14. 

What are cripple studs?
a.
The short blocks between the top plate and the window or door header.
c.
The dimensional lumber pieces used to secure the rafters to the top plate of each wall.
b.
The short pieces between the floor joinsts to insure squareness.
d.
I don’t know.
 

 15. 

How is the pitch of a roof figured?
a.
By calculating the total amount of inches run in the dimension of the rafters.
c.
By calculating the amount of the rise over the run.
b.
bu calculating the sum of the rafter legth divided by the roof angle.
d.
I don’t know.
 

Completion
Complete each statement.
 

 16. 

In a series circuit the __________ changes over each load.
 

 

 17. 

The black wire will always feed the __________.
 

 

 18. 

When the intake valve and exhaust valve are both open at the same time for a split second during the operating functions of a small engine what is this called?  ______________   ______________
 

 

 19. 

In the event that you would need to order a replacement part for a small engine you would first need to get the _______________ _______________ from the name plate on the engine.
 

 

 20. 

When welding with an electrode, what should the correct electrode angle be?  __________
 

 

 21. 

When welding with a 6013 rod that is 1/8 inch in diameter, what should the correct arc length be?  __________
 

 

 22. 

The soldering together of copper fittings and tubes is refered to as a __________ joint
 

 

 23. 

__________ wells are made with an earth auger that cuts and lifts the subserface material.
 

 

 24. 

Most internal engine parts are rated to perform in a certain tolerance range, which can be measured with a  __________
 

 

 25. 

In a two cycle engine the _______________ and _______________ are mixed when they enter the crankcase of the engine.
 

 



 
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