2A652 Age Journeyman Volume 4, Edit Code 6 Quiz

88 Questions | Total Attempts: 113

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2a652 Quizzes & Trivia

2A652 vol 4 Ed. 6.


Questions and Answers
  • 1. 
    (601) The heater control unit (HCU) on the New Generation Heater (NGH) starts the main air fan for output air when
    • A. 

      A heat setting is selected.

    • B. 

      A constant flame is established.

    • C. 

      The temperature gauge reads COOL.

    • D. 

      The inside temperature reaches 140 degrees Fahrenheit (°F).

  • 2. 
    (602) When should starting aids be used to start the New Generation Heater (NGH)?
    • A. 

      When the temperature gauge reads COOL.

    • B. 

      Never, as it will result in serious engine damage.

    • C. 

      When ambient temperature is below 32 degrees Fahrenheit (°F).

    • D. 

      During the engine start up with the ignition switch in PREHEAT position.

  • 3. 
    (602) When operating the New Generation Heater (NGH), turn the heat control switch to the desired position after
    • A. 

      Ample warm-up time.

    • B. 

      A minimum of 45 seconds.

    • C. 

      System voltage indicates 120 volts alternating current (VAC).

    • D. 

      The inside chamber temperature reaches 140 degrees Fahrenheit (°F).

  • 4. 
    (603) Repair of ground heater equipment should never be attempted
    • A. 

      Without first talking with the operator.

    • B. 

      Without first consulting your supervisor.

    • C. 

      Unless accurate technical data is available.

    • D. 

      Unless in the presence of an experienced mechanic.

  • 5. 
    (604) Heat that can be felt and added or subtracted to a substance without changing its state is called
    • A. 

      Super heat.

    • B. 

      Latent heat.

    • C. 

      Specific heat.

    • D. 

      Sensible heat.

  • 6. 
    (604) Heat added to a gas is
    • A. 

      Sensible heat.

    • B. 

      Specific heat.

    • C. 

      Super heat.

    • D. 

      Latent heat.

  • 7. 
    (605) A good refrigerant will
    • A. 

      Operate in moderate to high pressure.

    • B. 

      Operate in low to moderate pressure.

    • C. 

      Be semi-corrosive to metals.

    • D. 

      Have a high boiling point.

  • 8. 
    (606) Which MA–3D air conditioner control switch allows the operator to control the overall volume of air leaving the unit?
    • A. 

      Blower.

    • B. 

      Airflow.

    • C. 

      Evaporator.

    • D. 

      Temperature.

  • 9. 
    (606) Refrigerant leaving the evaporator coil, in the MA–3D air conditioner, is a
    • A. 

      Low-pressure gas.

    • B. 

      High-pressure gas.

    • C. 

      Low-pressure liquid.

    • D. 

      High-pressure liquid.

  • 10. 
    (606) When starting the MA–3D air conditioner, hold the safety override switch until
    • A. 

      30 pounds of oil pressure is reached on the engine oil pressure gauge.

    • B. 

      The start switch is released.

    • C. 

      The engine warms up.

    • D. 

      The engine starts.

  • 11. 
    (606) On the MA–3D air conditioner, which component shuts off the compressor when suction pressure drops below 5 pounds of pressure?
    • A. 

      Low pressure cutout.

    • B. 

      Temperature controller.

    • C. 

      Pressure control cutout.

    • D. 

      Compressor pump down overload.

  • 12. 
    (607) Which type of refrigeration system leak occurs when the pressure within the system is less than atmospheric pressure?
    • A. 

      Inward.

    • B. 

      Vacuum.

    • C. 

      Pressure.

    • D. 

      Outward.

  • 13. 
    (607) A refrigerant reclaimer is used to
    • A. 

      Remove refrigerant.

    • B. 

      Remove and store refrigerant.

    • C. 

      Remove refrigerant and separate acids from the refrigerant.

    • D. 

      Remove and store refrigerant and separate oil and acids from the refrigerant.

  • 14. 
    (607) Refrigerant is always removed through the
    • A. 

      Purge valve.

    • B. 

      Receiver inlet valve.

    • C. 

      Receiver outlet valve.

    • D. 

      Discharge service valve.

  • 15. 
    (608) An A/M32C–10D air conditioner air cycle machine consists of
    • A. 

      An air compressor fan only.

    • B. 

      An expansion turbine only.

    • C. 

      A heat exchanger and an expansion turbine.

    • D. 

      An expansion turbine and a compressor fan.

  • 16. 
    (608) Which A/M32C–10D air conditioner component extracts energy from bleed air on the air cycle machine?
    • A. 

      Compressor.

    • B. 

      Heat exchanger.

    • C. 

      Expansion turbine.

    • D. 

      Temperature controller.

  • 17. 
    (609) The ACE 802S air conditioner compressor switch must be held in the HOLD position when engaging the compressor in order to
    • A. 

      Ensure the engine is at governed speed before engaging compressor.

    • B. 

      Allow compressor oil and discharge pressures to stabilize.

    • C. 

      Defrost the evaporator.

    • D. 

      Build-up oil pressure.

  • 18. 
    (609) Which is the compressor displacement when the ACE 802S air conditioner compressor is in the HOLD position?
    • A. 

      Maximum.

    • B. 

      Minimum.

    • C. 

      Constant.

    • D. 

      Erradic.

  • 19. 
    (609) Which medium does the ACE 802S air conditioner heat boost system use to trim output air temperature?
    • A. 

      Air.

    • B. 

      Refrigerant.

    • C. 

      Electric heater.

    • D. 

      Engine coolant.

  • 20. 
    (609) Which action occurs in the ACE 802S air conditioner evaporator?
    • A. 

      Condensing refrigerant absorbs heat from the air stream.

    • B. 

      Boiling refrigerant absorbs heat from the air stream.

    • C. 

      Condensing refrigerant looses heat to the air stream.

    • D. 

      Boiling refrigerant looses heat to the air stream.

  • 21. 
    (610) Which valve must be opened prior to starting the ACE 802S air conditioner engine?
    • A. 

      Air shutoff.

    • B. 

      Fuel shutoff.

    • C. 

      Coolant control.

    • D. 

      Refrigerant flow.

  • 22. 
    (610) Which must be accomplished to avoid damage prior to operating the ACE 802S air conditioner in the HEATING mode after COOLING mode operation?
    • A. 

      Permit refrigerant pressure to equalize.

    • B. 

      Perform maximum refrigerant pump down.

    • C. 

      Place heating/cooling switch in HEATING position.

    • D. 

      Place the reversing valve lever in the HEATING position.

  • 23. 
    (611) In troubleshooting, which is the first step that must be completed when a unit comes in with a write-up?
    • A. 

      Isolate the problem.

    • B. 

      Perform a service inspection.

    • C. 

      Perform an operational check.

    • D. 

      Recognize the write-up as a malfunction.

  • 24. 
    (611) How can a restriction in a refrigerant system be identified?
    • A. 

      Sweating at the outlet of a component.

    • B. 

      Frosting at the outlet of a component.

    • C. 

      Abnormal compressor noise.

    • D. 

      Increased suction pressure. Please

  • 25. 
    (612) On a basic rotary compressor, which prevents air from leaving the discharge port while the intake port is taking air in?
    • A. 

      Sliding barrier.

    • B. 

      Rotating barrier.

    • C. 

      Discharge valve.

    • D. 

      Stationary barrier.

  • 26. 
    (612) Oil in a rotary vane compressor
    • A. 

      Lubricates the connecting rods.

    • B. 

      Has high viscosity and is very inflammable.

    • C. 

      Forms a seal between the vanes and the stator.

    • D. 

      Permits it to be classified as a high pressure unit.

  • 27. 
    (612) Which provides pressurized oil to the rotor blades of the MC–2A rotary sliding vane compressor?
    • A. 

      Hollow-ported bolt.

    • B. 

      Hollow stator shaft.

    • C. 

      Hollow rotor shaft.

    • D. 

      Drilled passages.

  • 28. 
    (612) On the MC–2A rotary sliding vane compressor, the minimum pressure valve does all of the following except
    • A. 

      Ensure minimum pressure within the oil chamber.

    • B. 

      Ensure minimum pressure to the condensate drain.

    • C. 

      Prevent receiver air from flowing back to the compressor by working as a check valve.

    • D. 

      Increase the efficiency of the felt pads by ensuring they receive a constant minimum air pressure.

  • 29. 
    (613) The MC–20 air compressor provides which kind of air for pneumatic tools and tire inflation?
    • A. 

      High pressure.

    • B. 

      Low pressure.

    • C. 

      High volume.

    • D. 

      Low volume.

  • 30. 
    (613) Every how many years is the hydrostatic test due on the receiver tank on a MC–20 air compressor?
    • A. 

      9.

    • B. 

      7.

    • C. 

      5.

    • D. 

      3.

  • 31. 
    (613) Which is the proper compressor oil level when checking the sight glass on a MC–20 air compressor?
    • A. 

      Between the bottom and half way up on the sight glass.

    • B. 

      Between half way and the top of the sight glass.

    • C. 

      Any oil level present in the sight glass.

    • D. 

      At least one-third up the sight glass.

  • 32. 
    (614) Which position should the vent valve be in when liquid oxygen (LOX) carts are being transported?
    • A. 

      Tow.

    • B. 

      Closed.

    • C. 

      Opened.

    • D. 

      Transport.

  • 33. 
    (615) How is the air compressor in the self generating nitrogen servicing cart (SGNSC) categorized?
    • A. 

      High-pressure.

    • B. 

      Low-pressure.

    • C. 

      High volume.

    • D. 

      Low volume.

  • 34. 
    (616) To start the self generating nitrogen servicing cart (SGNSC), the operator places the ignition switch in the start position for no more than how many seconds?
    • A. 

      5.

    • B. 

      10.

    • C. 

      15.

    • D. 

      20.

  • 35. 
    (616) At which storage cylinder pressure, in pounds per square inch gauge (psig), should the self generating nitrogen servicing cart (SGNSC) nitrogen booster compressor stop?
    • A. 

      2,400.

    • B. 

      4,100.

    • C. 

      4,400.

    • D. 

      6,400.

  • 36. 
    (617) Which is the proper level in the self generating nitrogen servicing cart (SGNSC) hydraulic reservoir?
    • A. 

      2/3 to 3/4 inch from the bottom of the glass.

    • B. 

      2/3 to 3/4 inch from the top of the glass.

    • C. 

      1/2 inch from the bottom of the glass.

    • D. 

      1/2 inch below the top of the glass.

  • 37. 
    (618) During an operational check of a self-generating nitrogen servicing cart (SGNSC) the engine is running at 3,000 revolutions per minute (rpm), but the nitrogen purity does not reach 95.5 percent within 30 minutes. Which is a probable cause of this malfunction?
    • A. 

      Warming door is not lowered for cold weather operating conditions.

    • B. 

      Low oil level in the feed air compressor lubricant separator tank.

    • C. 

      Booster compressor defective.

    • D. 

      Poor air ventilation.

  • 38. 
    (618) Which is important to keep in mind when performing maintenance on the self generating nitrogen servicing cart (SGNSC)?
    • A. 

      Weather conditions.

    • B. 

      Wind direction.

    • C. 

      Ventilation.

    • D. 

      Safety.

  • 39. 
    (619) The purpose of the MJ–2A–1 hydraulic test stand fill-and-bleed system is to fill the hydraulic system with fluid and
    • A. 

      Bleed air from the reservoir during operation.

    • B. 

      Purge entrapped air before operation.

    • C. 

      Fill the outlet hoses to the aircraft.

    • D. 

      Remove contaminants.

  • 40. 
    (619) Which position must the reservoir selector valve be in when filling and bleeding the MJ–2A–1 hydraulic test stand hydraulic system?
    • A. 

      OPEN.

    • B. 

      STAND.

    • C. 

      AIRCRAFT.

    • D. 

      EXTERNAL.

  • 41. 
    (619) Which valve protects the MJ–2A–1 hydraulic test stand from over pressurization when the unit is not operating?
    • A. 

      High pressure relief.

    • B. 

      Thermal relief.

    • C. 

      Check/relief.

    • D. 

      Fill relief.

  • 42. 
    (619) The purpose of the low pressure pump on the MJ–2A–1 is to ensure a constant flow of fluid to the
    • A. 

      Relief valves.

    • B. 

      Aircraft pumps.

    • C. 

      Low pressure filters.

    • D. 

      High pressure pump.

  • 43. 
    (619) The output volume (gallons per minute) of the MJ–2A–1 hydraulic test stand high pressure pump is controlled by the
    • A. 

      Volume control.

    • B. 

      Flow control valve.

    • C. 

      Compensator control.

    • D. 

      Flowmeter assembly.

  • 44. 
    (620) Which MJ–2A–1 hydraulic test stand engine system safety device sounds the warning horn in the event of an engine system malfunction?
    • A. 

      Water level switch.

    • B. 

      Oil pressure switch.

    • C. 

      Fuel level indicator.

    • D. 

      Fuel pressure switch.

  • 45. 
    (620) Which MJ–2A–1 hydraulic test stand switch provides an alternate means of energizing the fill pump when either of the micro switches are defective?
    • A. 

      Fill switch, LS4.

    • B. 

      Fill master switch.

    • C. 

      Fill micro switch, FS1.

    • D. 

      Fill to start relay switch.

  • 46. 
    (621) Which valve must be opened when setting up the MJ–2A–1 hydraulic test stand controls for operation?
    • A. 

      Return system bypass.

    • B. 

      Compensator control.

    • C. 

      Supply shut-off.

    • D. 

      System selector.

  • 47. 
    (621) Which is the setting of the MJ–2A–1 hydraulic test stand system relief valve?
    • A. 

      300 pounds per square inch (psi) above compensator valve pressure.

    • B. 

      300 psi above required test pressure.

    • C. 

      500 psi above compensator valve pressure.

    • D. 

      500 psi above required test pressure.

  • 48. 
    (622) Which type of wrench should be used on brass or aluminum fittings?
    • A. 

      Aluminum.

    • B. 

      Open end.

    • C. 

      Tubing.

    • D. 

      Brass.

  • 49. 
    (622) The hydraulic test stand high pressure pump is difficult to repair because of its
    • A. 

      Precision tolerances.

    • B. 

      Weight and size.

    • C. 

      Intricate parts.

    • D. 

      Age.

  • 50. 
    (623) Which type of pump is used on the MJ–1B bomblift truck hydrostatic system?
    • A. 

      Variable displacement.

    • B. 

      Fixed displacement.

    • C. 

      Rotary type.

    • D. 

      Gear type.

  • 51. 
    (623) The volume of oil delivered from the hydraulic pump to the hydrostatic motor on the MJ–1B bomblift determines the
    • A. 

      Direction of the lift arms.

    • B. 

      Speed of the lift arms.

    • C. 

      Direction of the truck.

    • D. 

      Speed of the truck.

  • 52. 
    (623) Which prevents overpressurization of the steering system on the MJ–1B bomblift?
    • A. 

      Bleed valve.

    • B. 

      Relief valve.

    • C. 

      Bypass valve.

    • D. 

      Pressure regulator.

  • 53. 
    (623) Continuous movement of pressurized hydraulic fluid in the MJ–1B bomblift causes the fluid to become
    • A. 

      Cooled.

    • B. 

      Heated.

    • C. 

      Compressed.

    • D. 

      Contaminated.

  • 54. 
    (623) Which MJ–1B bomblift component converts hydraulic pressure into mechanical motion?
    • A. 

      Engine.

    • B. 

      Piston pump.

    • C. 

      Lift arm cylinders.

    • D. 

      Cradle control valves.

  • 55. 
    (623) Which MJ–1B bomblift valve prevents collapsing of the cantilever lifting arms in the event of hydraulic pressure failure?
    • A. 

      Air bleed.

    • B. 

      Rotary by-pass.

    • C. 

      Counterbalance.

    • D. 

      Over pressurization.

  • 56. 
    (623) Which valve is used to slowly raise or lower the MJ–1B bomblift lift arms?
    • A. 

      Lateral control.

    • B. 

      Longitudinal control.

    • C. 

      Cradle lift arm control.

    • D. 

      Control panel lift arm control.

  • 57. 
    (624) As soon as the MJ–1B engine starts, check for sufficient
    • A. 

      Hydraulic pressure.

    • B. 

      Battery charging.

    • C. 

      Fuel pressure.

    • D. 

      Oil pressure.

  • 58. 
    (624) During the MJ–1B bomblift operational check, all hydraulic components should exhibit
    • A. 

      A smooth movement with no binding or no jumping.

    • B. 

      Fast steady movements with minimal jumping.

    • C. 

      Some settling once the actuator is released.

    • D. 

      Small amounts of residue.

  • 59. 
    (625) Which is the purpose of the MHU–83C/E bomblift rear control shutoff valve?
    • A. 

      Isolates the brake valve.

    • B. 

      Isolates the counterbalance valve.

    • C. 

      Cuts off fluid flow through the hydrostatic drive.

    • D. 

      Cuts off fluid flow through the rear control valves.

  • 60. 
    (625) Which MHU–83C/E bomblift component supplies the brake valve and calipers with fluid?
    • A. 

      System pump.

    • B. 

      Steering pump.

    • C. 

      Transmission pump.

    • D. 

      Hydraulic system control valve.

  • 61. 
    (626) When verifying the proper operation of the MHU–83C/E bomblift centering mechanism, the unit should
    • A. 

      Start in reverse.

    • B. 

      Move in neutral.

    • C. 

      Not start in reverse.

    • D. 

      Not move in neutral.

  • 62. 
    (626) Check the MHU–83C/E bomblift backup hydraulic system by
    • A. 

      Closing the shutoff valve.

    • B. 

      Operating the hand pump.

    • C. 

      Closing the air bleed valve.

    • D. 

      Operating the system pump.

  • 63. 
    (627) How do you check the MHU–83C/E bomblift shift lock lever for proper operation?
    • A. 

      An audible click will be heard and the locking lever will move upward.

    • B. 

      The unit will not move in reverse and an audible click will be heard.

    • C. 

      Locking lever will move upward and an audible click will be heard.

    • D. 

      The unit starts and moves in both directions.

  • 64. 
    (628) If a bomblift starter failed to operate, which step should be taken first?
    • A. 

      Replace the starter.

    • B. 

      Check the starter cables.

    • C. 

      Remove and replace the battery.

    • D. 

      Check the battery terminals and posts.

  • 65. 
    (628) When troubleshooting the MJ–1B bomblift electrical system, which component will give you a visual indication that the alternator is charging the batteries?
    • A. 

      Ammeter.

    • B. 

      Voltmeter.

    • C. 

      Bright head lights.

    • D. 

      Control panel light.

  • 66. 
    (628) The most obvious and easiest way of isolating most hydraulic malfunctions is to look for
    • A. 

      Slow operation.

    • B. 

      Erratic operation.

    • C. 

      Fluid under the unit.

    • D. 

      Movement when the control valve is not actuated.

  • 67. 
    (629) The engine safety circuits on the FL–1D floodlight set shutdown the engine by
    • A. 

      Opening the fuel solenoid.

    • B. 

      Closing the engine intake air.

    • C. 

      Shutting off fuel to the engine.

    • D. 

      Tripping the protective circuit breaker.

  • 68. 
    (630) Which must be done prior to raising or lowering the mast from the vertical or horizontal position on the FL–1D floodlight set?
    • A. 

      Secure all doors.

    • B. 

      Warm-up the engine.

    • C. 

      Set the master control switch to ON.

    • D. 

      Position the tow bar to the left or right.

  • 69. 
    (631) When a FL–1D floodlight set comes in with a write-up, how do you verify a malfunction exists?
    • A. 

      Operate the unit.

    • B. 

      Analyze the problem.

    • C. 

      Perform a service inspection.

    • D. 

      Give several probable causes.

  • 70. 
    (631) Where can you find test procedures for a particular component on a FL–1D floodlight set?
    • A. 

      Unit manufacturer’s technical order (TO).

    • B. 

      Periodic inspection workcards.

    • C. 

      Service inspection workcards.

    • D. 

      Illustrated parts breakdown.

  • 71. 
    (632) Which are the two lifting capacities (pounds) of the davit (lift pulley) on the split deck maintenance platform?
    • A. 

      150 and 550.

    • B. 

      250 and 500.

    • C. 

      550 and 2000.

    • D. 

      1000 and 2000.

  • 72. 
    (633) In which position is the engine switch placed to energize the electric fuel pump, fuel solenoid, and regulator on the split deck maintenance platform?
    • A. 

      RUN.

    • B. 

      MODE.

    • C. 

      START.

    • D. 

      DRIVE.

  • 73. 
    (634) While operating the split deck maintenance platform you realize the platform will not lower, the most probable cause could be
    • A. 

      Corroded battery cables.

    • B. 

      A defective control cable.

    • C. 

      The main disconnect switch is ON.

    • D. 

      The engine switch is in RUN position.

  • 74. 
    (635) Which component provides manual speed adjustment on the AF/M32T–1 cabin leakage tester?
    • A. 

      Tachometer.

    • B. 

      Diesel engine.

    • C. 

      Throttle assembly.

    • D. 

      Fuel system relief valve.

  • 75. 
    (635) Which component in the pneumatic system of the AF/M32T–1 cabin leakage tester limits system pressure to 15 pounds per square inch (psi)?
    • A. 

      Flow control valve.

    • B. 

      Safety relief valve.

    • C. 

      Rate control valve.

    • D. 

      Blower.

  • 76. 
    (636) If the air intake of the AF/M32T–1 cabin leakage tester was restricted, which effect would it have on operation?
    • A. 

      High blower output.

    • B. 

      Low blower output.

    • C. 

      High cabin pressure.

    • D. 

      Low flow indicator.

  • 77. 
    (636) You observe low cabin pressure reading during operation of the AF/M32T–1 cabin leakage tester, a probable cause could be a defective
    • A. 

      Blower pressure gauge.

    • B. 

      Cabin pressure gauge.

    • C. 

      Flowmeter.

    • D. 

      Rate valve.

  • 78. 
    (637) Which is the reservoir fluid capacity and system pressure of the hydraulic pump on the B–6, 10-ton hydraulic tripod jack?
    • A. 

      2.1 gallons at 2,250 pounds per square inch (psi).

    • B. 

      1.5 gallons at 2,200 psi.

    • C. 

      1.1 gallons at 2,235 psi.

    • D. 

      1.0 gallons at 1,135 psi.

  • 79. 
    (637) Which must be done before lowering the ram on the B–6 tripod jack?
    • A. 

      Tighten the ram lock nut.

    • B. 

      Loosen the ram lock nut.

    • C. 

      Close the relief valve.

    • D. 

      Close the air vent.

  • 80. 
    (638) Which component on the B–1 adjustable aircraft maintenance platform allows the work platform and steps to remain parallel to the base at any desired platform height?
    • A. 

      Base assembly.

    • B. 

      Upper platform.

    • C. 

      Stair support linkage.

    • D. 

      Hydraulic cylinder assembly.

  • 81. 
    (638) The B–4 adjustable aircraft maintenance platform can attain heights of a minimum of
    • A. 

      3 feet to a maximum of 15 feet.

    • B. 

      3 feet to a maximum of 7 feet.

    • C. 

      2 feet to a maximum of 12 feet.

    • D. 

      2 feet to a maximum of 5 feet.

  • 82. 
    (638) Which type of mechanism does the B–4 adjustable aircraft maintenance platform use to raise and lower the platform?
    • A. 

      Screw.

    • B. 

      Scissor.

    • C. 

      Ratchet.

    • D. 

      Pneumatic.

  • 83. 
    (639) Which section of the MD–1 towbar has a screw actuated fork assembly that is used to engage or disengage the aircraft nose gear?
    • A. 

      Head adapter assembly.

    • B. 

      Main tube assembly.

    • C. 

      Extension tubes.

    • D. 

      Lift actuator.

  • 84. 
    (639) The purpose of the lift mechanism on the MD–1 tow bar is to
    • A. 

      Adjust the forks.

    • B. 

      Stabilize the main tube assembly.

    • C. 

      Raise and lower the wheel assemblies.

    • D. 

      Engage or disengage the aircraft nose gear.

  • 85. 
    (640) Which is the overflow tank capacity (gallons) on the PMU–29/E oil cart?
    • A. 

      1.

    • B. 

      2.

    • C. 

      3.

    • D. 

      2.5.

  • 86. 
    (640) Which position is the valve handle placed in to precharge the PMU–29/E oil cart supply tank?
    • A. 

      BYPASS.

    • B. 

      OPEN.

    • C. 

      OFF.

    • D. 

      ON.

  • 87. 
    (641) When servicing the hydraulic cart, which prevents large particles in the fluid from entering the reservoir?
    • A. 

      Line filter.

    • B. 

      Check valve.

    • C. 

      Mesh screen.

    • D. 

      Relief valve.

  • 88. 
    (642) The chain hoist on the universal jack tester is operated by
    • A. 

      Pressure from the jack.

    • B. 

      Beam assembly.

    • C. 

      A control box.

    • D. 

      Load cell.