Area 25 Exam Flashcards by Justin Wood

A check valve is used to prevent a __.

backflow of water

How well did you know this?

Not at all

Perfectly

Positive displacement pumps _____.

move a fixed amount of liquid with each cycle

How well did you know this?

Not at all

Perfectly

The most efficient method for calibrating a boom sprayer in the field is _____.

measure nozzle flow rates over a timed interval

How well did you know this?

Not at all

Perfectly

The most important factor in replacing an electric motor is _____.

specs of the original motor

How well did you know this?

Not at all

Perfectly

One acre encompasses _____.

43,560 square feet

How well did you know this?

Not at all

Perfectly

A milliampere is _____.

0.001 ampere

How well did you know this?

Not at all

Perfectly

The horsepower rating on an electric motor indicates _____.

work output capacity over time

How well did you know this?

Not at all

Perfectly

An item not typically found in a sprayer operator’s manual is _____.

recommended spare parts suppliers

How well did you know this?

Not at all

Perfectly

The most common quick shut-off valve is a _____.

ball valve

How well did you know this?

Not at all

Perfectly

On a 1/6 hp motor, reset a tripped circuit breaker by _____.

push the breaker all the way off & turn it on again

How well did you know this?

Not at all

Perfectly

If a circuit trips repeatedly _____.

ID & correct the cause before resetting

How well did you know this?

Not at all

Perfectly

To apply 3 pints/acre of pesticide in 11 gallons of spray solution, to a 300-gallon tank, add _____.

10.22 gallons of pesticide

How well did you know this?

Not at all

Perfectly

Pipe fittings are sized to the specific _____.

pipe size

How well did you know this?

Not at all

Perfectly

NEMA is the acronym for _____.

National Electrical Manufacturer’s Association

How well did you know this?

Not at all

Perfectly

The appropriate electric conductor classification for installations subject to heat & moisture is _____.

THWN

How well did you know this?

Not at all

Perfectly

A sesame field of 827,326 square feet contains _____.

19 acres

How well did you know this?

Not at all

Perfectly

Common types of strainers do not include _____.

sump strainers

How well did you know this?

Not at all

Perfectly

When wiring an electric motor to a 3-conductor, 120v circuit according to NEC, attach the green motor
lead to the _____.

bare wire on the cable

How well did you know this?

Not at all

Perfectly

PVC pipe is most often joined with _____.

slip fittings

How well did you know this?

Not at all

Perfectly

PVC fittings are not designed to _____.

strengthen pipe

How well did you know this?

Not at all

Perfectly

To pull conductors through conduit, use a _____.

fish tape

How well did you know this?

Not at all

Perfectly

At the end of each spraying season, tips and screens should be _____.

removed, cleaned, and stored in diesel fuel

How well did you know this?

Not at all

Perfectly

Rate of electric current flow in electric motors is measured in _____.

amperes

How well did you know this?

Not at all

Perfectly

PVC pipe is generally sold in _____.

10’ & 20’ lengths

How well did you know this?

Not at all

Perfectly

The ASABE hand signal to raise a spray boom is _____.

point your arm & fingers downward and make a circular motion

Boom sprayer pumps are rated by _____.

flow in GPM / LPM at specified speed & pressure

When connecting magnetic motor starters _____.

wire the start switch in parallel

To change direction of shaft rotation on an electric motor, you need to _____.

reverse the starting & running windings

The function of the pressure regulator in a boom sprayer is to _____.

maintain consistent system pressure to ensure the proper application rate

To control a 3-phase pump motor, use a _____.

three-pole switch

Residential wastewater is also called _____.

effluent

The two types of pumps used on boom sprayers are positive displacement pumps and _____.

centrifugal pumps

During heavy use seasons, clean your boom sprayer nozzles & filters _____.

after every chemical change

You will find safety words such as duck, watch out, and danger positioned near _____.

hazards

A pressure switch in a pump system is activated by _____.

water system pressure

PVC pipe is generally available in _____.

Sch 40 & 80

A critical task in ensuring a leak-free PVC joint after gluing is _____.

making a 1/4 turn after inserting the pipe fully into the fitting

A cable to an electric motor consisting of #10 conductors, with one red, one white, one black and one ground will be stamped _____.

10/3 WG

On a 240-v circuit, an effective control device would be a _____.

double-pole motor controller

To clean PVC pipe mechanically, you can use a _____.

pocket knife

A motor with a high service factor can _____.

be overloaded for short periods without damage

PVC pipe is used in septic systems for _____.

subsurface field drainage

To ensure accurate application with a boom sprayer _____.

adjust the nozzle pressure & flow rate to match your target application rate

To size a 3" PVC pipe to a 2" pipe, use a _____

reducer

Before operating a boom sprayer in a new field _____.

calibrate the sprayer based on field conditions and application needs

Information not typically found on an electric motor nameplate is _____.

wire color code

Burrs on PVC pipe may also be cleaned with _____.

sandpaper

VRA technology components do not include _____.

rotators

PVC pipe is not well-suited for _____

warm water

Agitate the liquid in the spray tank by _____.

bubbling air into the tank

The motor control device for a 2 hp or greater motor should be _____.

in hp, not greater than the hp of the motor

Pumps on boom sprayers are generally designed to operate at pressures of _____.

20-40 psi

To double the flow rate, increase the pressure _____.

by a factor of 4

A boom sprayer that covers 500' in 48 seconds travels at _____.

7.1 mph

Rotary pumps _____.

use gears and vanes to move fluid

Exposed residential wiring is referred to as _____.

surface wiring

When adjusting nozzle settings in the field, do not drive your boom sprayer _____.

36' for a 60' spacing

PVC pipe can be marked prior to cutting with a _____.

marker

Use a GFCI with a portable electric pump to _____.

break the circuit if a difference in current exists between the hot and bare conductors

Properly-sized branch circuit conductors that supply electric motors should carry _____.

125% of the motor's full-load amperage rating

PVC pipe connections should be cleaned both mechanically and _____.

chemically

33,000 ft.-lbs./minute equals _____.

1 hp

Place switches and controls on _____.

hot wires connecting the load to the source

Under prolonged exposure to sunlight, PVC pipe tends to _____.

lose its strength

To apply herbicides with minimal drift, use a _____.

flat fan nozzle with air induction

PVC pipe connections are made with _____.

solvent

The purpose of the boom sprayer's agitation system is to _____.

maintain the chemical mix uniformly in the solution

Residential waste systems irrigate open land by incorporating _____.

surface application systems

Motor controllers must have an Hp rating that is _____.

1.25 X the rating of the motor

A motor control system's thermal overload protector prevents _____.

overheating due to excessive current

Loose electrical connections will cause _____.

high resistance

Using a 2 hp motor to pump 40,000 gallons of water into a chemigation system at the rate of 150 gallons/hour with a power cost of $0.03/KWH will cost about _____.

16.02

Electric energy usage by motors is measured in _____.

watts

The longest-wearing boom sprayer nozzle tips are manufactured from _____.

ceramic materials

Electrical supplies such as conductors, switches, and receptacles should be approved by _____.

To compensate for wear, sprayer pumps should have a reserve capacity of _____.

10-20%

The color of conductor used to ground 120V circuits is _____.

green

The highest tensile strength for a steel bolt is SAE GRADE _____.

Positive displacement pumps do not include _____.

centrifugal pumps

To shut off water flow in an irrigation system, use a _____.

globe valve

Motor controllers & sensing devices must meet specifications outlined in the _____.

NEC

PVC primer is generally colored _____.

purple

In a correctly-wired circuit serving a 120v electrical motor, according to NEC, the neutral wire _____.

is a current-carrying conductor

A magnetic relay is most often used to _____.

start a motor circuit remotely

Minimize chemical spray drift by _____.

lowering boom height and selecting proper nozzles

Flow rates can increase due to _____.

nozzle tip wear

A 120v, 5 hp electric motor has a theoretical wattage consumption of _____.

5000 watts

Use a tachometer to measure _____.

RPM

Sprayer nozzle screens should be _____.

slightly smaller than the nozzle tip

To prevent power surges in an electrical system, install a _____.

circuit breaker

To clean PVC pipe chemically, use special _____.

primer

A PTO rated at 1000 rpm has _____.

21 splines

a 7.5' diameter wheel turning with a force of 675 lbs. develops _____.

5062 foot-pounds of torque

A motor that runs a transfer pump to fill a boom sprayer should be protected by a _____.

GFCI

A half-section of land contains _____.

320 acres

A clogged nozzle in a boom sprayer often results in _____.

uneven chemical distribution across the spray width

A control device that responds to the presence or absence of light is a _____.

photoelectric sensor

Variable Rate Application (VRA) technology does not use _____.

isobar maps

One mile per hour (MPH) equals _____.

88 fpm

Rural water supply systems use PVC pipe for _____.

distribution lines & residential connections