VRA Study Questions and Answers
What is the main goal/ Purpose of using VRA Correct Answer Increase profit
What does VRA have the ability to alter Correct Answer Seeding rates
Pest control products Fertilizers
Components of VRA Correct Answer Actuator
Controller
Ground Speed
Sensors
Actuator Correct Answer Responds to controller, regulates the amount of material applied.
They respond to three types of signals from the controller:
-Electrical
-Pneumatic/Air
-Hydraulic/Fluid
Controller Correct Answer Microprocessors that read the input/data to direct the output signal to
the actuator
-Calculates the proper product rate
-Stores it as an algorithm.
Ground Speed Correct Answer The speed the cobine or tractor is moving/applying rate. Measured 4
different ways
Magnetic
Ultrasonic
Radar
dGPS
Magnetic Correct Answer 1/4 ways to measure ground speed
-Measures the speed of rotating shaft/tire, and is attached to the wheel or drive shaft.
-CHEAP
-Can be subject to slippage when wet, whch can cause inaccuracy
, VRA Study Questions and Answers
Ultrasonic Correct Answer 2/4 ways to measure ground speed
-Utilizes sound waves like sonar to detect speed
-Used on more high end equipment like drones, and sprayers (sound waves do not bounce off crop
residue)
-Not subject to wheel slippage when wet
Radar Correct Answer 3/4 ways to measure ground speed
-Utilizes radio waves to measure ground speed.
-Susceptible to error in high residue areas, or high wind areas due to radio waves that may bounce
off crop residue
-To combat errors, dual beams are more accurate than single beams.
dGPS Correct Answer 4/4 ways to measure ground speed
No extra equipment needed assuming dGPS receiver is being utilized
-Measures speed by simply timing location from point A-point B.
-Can be inaccurate due to positional determination
-Operation is determined by NAVSTAR
Sensor Correct Answer Sensor based systems are very high in advantage when in comes to sampling.
-They can collect dozens of samples an acre, with increased density for a more accurate depiction of
the fields variety.
-With this information the farmer can make the best decisions for his/ her fields.
Sensor types Correct Answer Electromagnetic
Optical
Mechanical
Electrochemical
AirFlow
Electromagnetic Sensor Correct Answer Utilizes eclectic circuits to measure the capacity for soil
particles to conduct or accumulate an electrical charge.
What is the main goal/ Purpose of using VRA Correct Answer Increase profit
What does VRA have the ability to alter Correct Answer Seeding rates
Pest control products Fertilizers
Components of VRA Correct Answer Actuator
Controller
Ground Speed
Sensors
Actuator Correct Answer Responds to controller, regulates the amount of material applied.
They respond to three types of signals from the controller:
-Electrical
-Pneumatic/Air
-Hydraulic/Fluid
Controller Correct Answer Microprocessors that read the input/data to direct the output signal to
the actuator
-Calculates the proper product rate
-Stores it as an algorithm.
Ground Speed Correct Answer The speed the cobine or tractor is moving/applying rate. Measured 4
different ways
Magnetic
Ultrasonic
Radar
dGPS
Magnetic Correct Answer 1/4 ways to measure ground speed
-Measures the speed of rotating shaft/tire, and is attached to the wheel or drive shaft.
-CHEAP
-Can be subject to slippage when wet, whch can cause inaccuracy
, VRA Study Questions and Answers
Ultrasonic Correct Answer 2/4 ways to measure ground speed
-Utilizes sound waves like sonar to detect speed
-Used on more high end equipment like drones, and sprayers (sound waves do not bounce off crop
residue)
-Not subject to wheel slippage when wet
Radar Correct Answer 3/4 ways to measure ground speed
-Utilizes radio waves to measure ground speed.
-Susceptible to error in high residue areas, or high wind areas due to radio waves that may bounce
off crop residue
-To combat errors, dual beams are more accurate than single beams.
dGPS Correct Answer 4/4 ways to measure ground speed
No extra equipment needed assuming dGPS receiver is being utilized
-Measures speed by simply timing location from point A-point B.
-Can be inaccurate due to positional determination
-Operation is determined by NAVSTAR
Sensor Correct Answer Sensor based systems are very high in advantage when in comes to sampling.
-They can collect dozens of samples an acre, with increased density for a more accurate depiction of
the fields variety.
-With this information the farmer can make the best decisions for his/ her fields.
Sensor types Correct Answer Electromagnetic
Optical
Mechanical
Electrochemical
AirFlow
Electromagnetic Sensor Correct Answer Utilizes eclectic circuits to measure the capacity for soil
particles to conduct or accumulate an electrical charge.
