Minnesota FFA Agriculture Mechanics Career Development Event
WRITTEN EXAMINATION 2015
You will have 50minutes to complete this examination. Answer the multiple choice
questions by selecting the one best answer for each question. Mark your answers on the
answer sheet provided.
Do not write on this exam
Tractor Power
1. A 12 volt battery connected in series?
A. Doubles Voltage
2. A 12 volt automotive battery has _____ cells.
A. 1
C. 6
B. 2
D. 12
B. Doubles CCA
3. Firing order of a 6 cylinder engine is:
A. 153246.
C. 153624.
B. 156243.
D. 164253.
4.
Convert 9/16 to decimals. Nearest 10,000th.
A. .5938
B. .43475
C. .5625
D. .6250
5. Oil rating 10W30 the W refers to what:
A. Winter
B. Weight
6. Constant flow variable pressure is the definition for:
A. Closed center hydraulic system
B. Open center hydraulic system.
7. What is the square inch of a 4.5 inch cylinder?
A. 15.90
B. 4.5
C. 20.25
D. 3.14
8. Convert bar to psi multiply by _____________?
A. 17.2
B. 10
C. 14.5
D. 2.5
9.
When the intake valve is open and the piston is moving down, air and diesel fuel is drawn
into the cylinder on a diesel engine equipped with a turbocharger.
A. True or
B. False
10. The camshaft turns twice when the crankshaft makes one turn on a 4 stroke diesel engine.
A. True
B. False
11. True or False. Methane is a rating for diesel fuel.
12. Both
A.
B.
C.
D.
intake and exhaust valves are open at the same time on a 4 stroke engine at:
End of power and beginning of exhaust stroke
End of intake and beginning of compression stroke
End of exhaust and beginning of intake
End of compression and beginning of power stroke
13. A diesel engine intercooler cools?
A. Water.
B. Diesel fuel.
C. Air entering the turbocharger
D. Air leaving the turbocharger
14. What controls the cooling system temperature?
A. Water pump.
B. Water temperature.
C. Cooling system cap.
D. Thermostat.
15. An exhaust or intake valve installed above the head surface is called what?
A. Recession.
B. Protrusion.
Concrete, Masonry, and Plumbing Test Questions
16. A bag of Portland cement is:
A. ½ cubic year of material
B. 1 cubic yard of material
C. ½ cubic foot of material
D. 1 cubic foot of material
17. The chemical reaction which concrete from a plastic to a hardened state is known as:
A. Thermal bonding.
B. Heat of hydration
C. Hydro-dynamics
D. Polymer bonding
18. The yield from a concrete mix will generally be ______% of the total volume.
A. 40
B. 50
C. 60
D. 70
19. In regular residential construction, basement window openings are usually located level
with the top of the foundation wall so the weight of the overhead structure is carried by
a ________________.
A. Beam
B. Precast lintel
C. Lintel
D. Sill
20. When you mix mortar using Portland cement, _____________ is added to make the mix
more workable and to improve its adherence qualities.
A. Hydrated lime
B. Gypsum
C. Silica
D. Magnesium
21. If after a period of time concrete builds up on concrete tools and mixer, a solution of
____________ acid can be used to remove the concrete.
A. Benzoic
B. Muriatic
C. Acetic
D. Hydrochloric
22. Standard concrete blocks are normally laid with a mortar joint that is
thick.
A. ¼”
B. 5/16”
C. 3/8”
D. 7/16”
__________
23. Materials added to concrete or mortar to change its properties (such as freezing point or
curing time) are called:
A. Accelerators
B. Admixtures
C. Inhibitors
D. Entraining agents
24. A typical concrete mix will weigh about _________ pounds per cubic foot.
A. 94
B. 100
C. 150
D. 180
25. The taper of a pipe thread is _______ per inch.
A. 1/8
B. 3/32
C. 1/16
D. 1/32
26.
A.
B.
C.
D.
Galvanized steel pipe has a coating of ____________ on the outside to prevent rusting.
Zinc
Nickel
Tin
Magnesium
27. Pipe that is available in both flexible and rigid from is:
A. ABS
B. PEX
C. Copper
D. PVC
28. A properly soldered copper joint, using lead-free solder, is how strong when compared
to the pipe itself.
A. Stronger
B. Equal
C. Weaker
D. Twice as strong
29. Plastic pipe that will handle both cold and hot water applications is labeled:
A. PVC
B. CPVC
C. ABS
D. DWV
30. Which material is not used for PEX fittings?
A. Brass
B. Copper
C. Engineered plastic
D. Galvanized steel
Metal Fabrication (MIG, Fuel Gas Welding and Cutting, Cold Metal)
31. The Temperature of a neutral oxy-acetylene flame is approximately?
A. 4500 degrees F
B. 5200 degrees F
C. 6000 degrees F
D. 7000 degrees F
32. What is the recommended lens shade for most oxy-fuel cutting applications?
A. 3
B. 5
C. 7
D. 9
33. What type of thread and color is oxygen associated with?
A. Left Hand Thread-Red
B. Left Hand Thread-Green
C. Right Hand Thread-Red
D. Right Hand Thread-Green
34. Acetylene is dissolved into this substance?
A. Acetone
B. Butanol
C. Benzene
D. Ketone
35. What is not a type of welding flame?
A. Neutral
B. Carburizing
C. Ionizing
D. Oxidizing
36. When oxyfuel welding, gases are mixed in the following before exiting the torch?
A. Head
B. Tube
C. Tip
D. Mixer
37. Acetylene regulators should be set above _________ psi.
A. 10
B. 15
C. 20
D. 25
38. Large drill bit sizes should be operated at a _____________ than smaller
A. Slower speed
B. Faster speed
C. Greater pressure
D. Flatter angle
39. The pitch of a bolt thread refers to:
A. Outside diameter of the thread
C. The thread to thread distance
bit sizes.
B. Root diameter of the thread
D. Taper of N.P.T. tap
40. The hole size for a tap is typically __________ than the tap size for course threads.
A. 1/8” smaller
B. 1/8” larger
C. 1/16” larger
D. 1/16” smaller
41. When using ___________ as a shielding gas for GMAW, you will find that it is higher
priced, but has spatter and a flatter bead.
A. 100% Helium
B. 75% Argon, 25% Carbon Dioxide
C. 100% Argon
D. 100% Carbon Dioxide
42. On the GMAW machine, which of the following settings will you not be able to adjust?
A. Amperage
B. Voltage
C. Polarity
D. Wire Feed Rate
43. During GMAW if the shielding gas is disturbed, there is the potential for air to
contaminate the weld puddle and lead to __________.
A. Hydrogen cracking
B. Oxides forming on the metal
C. Flux entrapment
D. Porosity
44. In the GMAW welding process, the “consumable” electrode is in the form of a:
A. 8” electrode
B. 12” electrode
C. Continuous wire
D. Tungsten electrode
45. These charts/graphs are used to properly size regulators?
A. Time charts
B. Pressure charts
C. Flow charts
D. Density charts
Electrical
46. All of the following are factors that can affect the life of a motor except ________.
A. Dust
B. Water and moisture
C. Dry air
D. Excessive oiling
47. Which of the following is not a protective enclosure for an electric motor?
A. Drip-proof
B. Splash proof
C. Totally enclosed
D. Explosion proof
E. All of the above are protective enclosures
48. Motors need adequate cooling or all of these problems can occur except ________.
A. Breakdown of the insulation of the winding conductors
B. Overloading of the motor due to partial shorts in the windings
C. A higher amperage draw resulting in greater voltage drop
D. A higher voltage draw resulting in excessive RPMs to motor
49. A motor’s nameplate provides information about all of the following except_______.
A. RPM
B. Class rating
C. Temperature drop
D. Voltage
50. A motor with a full - load current of 12.5 amps can be protected from
running overload protection by a (n) _________ amp use. (Use minimum rating)
A. 10
B. 12
C. 15
D. 17
51. The windings of three- phase induction motors are located approximately
degrees out of phase from each other.
A. 90
B. 120
C. 180
D. 240
_________
52. If a motor is a dual voltage motor and it draws 10 amps on the 115 volt it will draw
_________ amps on the 230 volts.
A. 5
B. 10
C. 20
D. 40
53. The type of electric motor enclosure that must be used to move grain in a feed bin is:
A. Totally enclosed
B. Drip proof
C. Splash proof
D. Open enclosure
54. Squirrel Cage Is a Term Used to Describe
A. The Shaft.
B. The Frame.
C. The Windings.
D. The Rotor.
55. If Electric Motors Are Not Cooled Properly Problems Can Occur by
A. Insulation breaking down in the Windings.
B. Shorts Developing in the Windings.
C. An Increase in Amperage Draw Resulting in a Voltage Drop.
D. All of the Above.
56. Ambient air temp refers to which of the following?
A. The temperature of the medium which surrounds the motor.
B. The temperature of the air inside the housing.
C. The temperature at which the motor will fail.
D. The temperature required for bi-metallic strip to separate from each other.
57. The stationary electromagnet in an electric motor is called a:
A. Stator.
B. Rotor.
C. Armature.
D. None the above
58. Which of the following is not a type of 3 phase motors?
A. Delta
B. Sigma
C. Wye
D. None of the above
59. Sealed ball bearings on an electric motor should be:
A. Greased once a month.
B. Greased every other month.
C. Cannot be greased.
D. Greased once a year
60. The type of motor that would be found operating a timeclock:
A. Direct current
B. Synchronous
C. Induction
D. Three phase
Sprayer
61. The sprayer pump that is most popular for applying wetable powder spray
materials on large acreage such as might be common for a custom applicator.
A. Piston
B. Centrifugal
C. Diaphragm
D. Roller
62. Sprayer tanks made of this material are most popular for corrosive liquid fertilizer
application by commercial applicators.
A. fiberglass
B. metal with epoxy lining
C. stainless steel
D. aluminum
63. The sprayer pump that is considered to have positive displacement and will deliver the
highest pressure.
A. Piston
B. Centrifugal
C. Diaphragm
D. Roller
64. The application rate for field sprayers is usually given in:
A. MPH
B. GPA
C. PSI
D. None of these
65. The safest way to mix pesticides for use is:
A. Read label directions carefully and measure amounts accurately
B. Add extra if the pest problem is severe
C. Mix slightly more than needed so as not to run out
D. All of these
66. Pesticide vapors move by:
A. Air movement
B. Diffusion
C. Both A and B
D. None of these
67. Which is responsible for maintaining the required pressure in the spray system?
A. Pressure gauge
B. Pressure regulator
C. Strainers
D. All of these
68. Too high pressure on a given nozzle will result in a small particle size and a distorted
spray pattern.
A. True
B. False
69. Chemical drift can be affected by:
A. Formulation of the chemical
B. Nozzle size.
C. Pressure
D. All of these
70. Nozzles should be selected to give the proper:
A. Spray pattern
B. Particle size
C. Application
D. All of these.
71. Strainers or screens are placed at various points in the system to exclude foreign
material.
A. True
B. False
72. The flooding nozzle tip is commonly used for broadcast application of liquid fertilizer
materials.
A. True
B. False
73. A spray nozzle should be replaced if it is +/- _______% of the average output of all
nozzles.
A. 1
B. 2
C. 3
D. 4
E. 5
74. If it takes a tractor 23 seconds to travel 145 ft. how fast is it traveling?
A. 2 mph
B. 3 mph
C. 4 mph
D. 5 mph
E. 6 mph
75. When using ammonia as a tank cleaner it should be used at the rate of 1qt ammonia for
every 100 gallons of water.
A. True
B. false
Land Measurement, Leveling, and GPS/GIS
76. The most important type of positioning system used in American Agriculture today is
A. GPS
B. GLONASS
C. Land-based
D. RMS
E. None of the above
77. The precision farming operation considered by many to be the logical first step in
implementing a precision farming program is...
A. Building radio towers
B. Buying all new equipment
C. Installing irrigation equipment
D. Crop yield monitoring and mapping
E. None of the above
78. The Global Positioning System
A. Consist of approximately 30 satellites
B. Is operated by the Department of defense
C. Operates 24 hrs. a day 7 days a week
E. All of the above
79. GPS satellites
A. Are equipped with three or four clocks
B. Contain cesium and rubidium
C. Form a constellation
D. A and C
E. All of the above
80. Which item is not a component of a grain yield monitor?
A. Header position switch
B. Display console
C. Rotor shaft sensor
D. Ground speed sensor
E. Moisture sensor
81. In order to account for delays in grain movement from the header to the sensor you need
A. A start of pass delay
B. A stop button
C. An operational delay
D. A ramping button
E. None of the above
82. Which of the following factors is not a crop yield monitoring error source?
A. Abrupt changes in travel speed
B. Cutting width errors
C. GPS errors
D. Field efficiency of turns
E. Moisture readings
83. Which of the following is not a measure of DGPS accuracy?
A. circular error probable
B. spherical error probable
C. RMS/2DRMS
D. SD
E. All are measures of accuracy
84. True or False. Current whole-field management approaches often ignore variability in soil
related characteristics.
85. True or False. Current technology does not permit us to apply pesticide to individual
plants while driving across a field.
86. True or False. Some multi-channel receivers can track 20 satellites simultaneously.
87. True or False. Slippage causes travel speed to be underestimated.
88. True or False. GPS can calculate speed measurements.
89. True or False. Yield monitoring requires a real-time source of differential correction.
90. True or False. The PC card stores data in JPEG files.
2015 AG MECHANICS EXAM KEY
1. A
2. C
3. C
4. C
5. A
6. B
7. A
8. C
9. B
10. B
11. B
12. C
13. D
14. D
15. B
16. D
17. B
18. C
19. D
20. A
21. B
22. C
23. B
24. C
25. D
26. A
27. C
28. B
29. B
30. D
31. C
32. B
33. D
34. A
35. C
36. D
37. B
38. A
39. C
40. D
41. B
42. A
43. D
44. C
45. C
46. C
47. E
48. D
49. C
50. C
51. B
52. A
53. A
54. D
55. D
56. A
57. A
58. B
59. C
60. B
61. B
62. C
63. A
64. B
65. A
66. C
67. A
68. A
69. D
70. D
71. A
72. A
73. E
74. C
75. A
76. A
77. D
78. E
79. E
80. C
81. C
82. D
83. E
84. A
85. A
86. A
87. B
88. A
89. B
90. B