Assignment 1

White wires used as an ungrounded conductor must be

taped or painted black

Steel angle iron is sold for $1.16 per linear foot, steel rod is sold for 88 cents per linear foot, and steel pipe is sold for $2.44 per linear foot. If 25.8 feet of angle iron, 19 feet of rod, and 231 inches of pipe are purchased, and 7% taxes are paid with the purchase, what is the approximate total price for the metal?

$ 100.17

Steel angle iron is sold for $2.11 per linear foot, steel rod is sold for $1.91 per linear foot, and steel pipe is sold for $3.19 per linear foot. If 28.5 feet of angle iron, 23 feet of rod, and 15.5 feet of pipe are purchased, what is the approximate total price for the metal before taxes?

$ 153.51

The monthly charge to operate an electric pump is 12.75 cents per kilowatt hour (kWh) for the first 1000 hours and 13.9 cents for each kWh greater than 1000 hours. If the pump uses 9.25 kilowatts per hour and it operates 25 days each month for 8 hours each day, what is the approximate monthly kWh charge to operate the pump?

$ 245.65

The interior electrical lighting of a farm structure is being replaced with high efficiency lighting. The 36 incandescent, 100-Watt lights will be replaced with 36 LED, 40-Watt lights. If the lights are operated 100 hours per month and electricity cost 12.75 cents per kilowatt-hour (kWh), what is the approximate reduction in electrical power costs each month?

$ 27.54

The monthly charge to operate an electric pump is 13.75 cents per kilowatt hour (kWh) for the first 1000 hours and 15.55 cents for each kWh greater than 1000 hours. If this pump uses 2779 kWhs of electricity during a single month, what is the approximate monthly cost to operate the pump?

$ 415

A tractor produces 250 PTO horsepower at a rated power take-off speed of 1000 revolutions per minute. How much torque in foot-pounds does the tractor produce at the power take-off shaft?

1,313 lb-ft

The interior electrical lighting of a farm structure is being replaced with high efficiency lighting. The 36 incandescent, 150-Watt lights will be replaced with 24 LED, 60-Watt lights. If the lights are operated 105 hours each month and electricity cost 11.74 cents per kilowatt-hour (kWh), what is the approximate reduction in electrical power costs each month?

$ 48.81

Steel angle iron is sold for $1.79 per linear foot, steel tubing is sold for $2.11 per linear foot, and rebar is sold for 38 cents per linear foot. If 112 feet of angle iron, 95 feet of tubing, and twelve 20-foot lengths of rebar are purchased, and 6.67% taxes are paid with the purchase, what is the approximate total price for the metal?

$ 524.96

Which of the following American Wire Gauge (AWG) sizes indicates the largest wire diameter? a. 4 awg b. 18 awg c. 10 awg d. 00 awg

. 00 awg

. In a two-stroke cycle engine the crankshaft turns _______ revolution(s) for each complete operating cycle

1

A 21-foot length of unthreaded black pipe is to be cut into 11 pieces of equal length. Both ends of the 21-foot pipe are already cut square (90 degrees) and the 11 pieces will also have square cut ends. The metal saw being used cuts a kerf (material removed by saw blade) that is 1/8 inch wide. Other than the material lost by the saw kerf, none of the pipe is wasted or unused in cutting the 11 pieces of equal length. What is the approximate length (in feet, inches and fraction of an inch) of each piece of the pipe

1 foot, 10 and 25/32 inches

Intake and/or exhaust fans should have the capacity in cubic feet per minute to adequate exchange the air in a greenhouse every three minutes. The rectangular floor of the greenhouse measures 36 feet by 60 feet and the walls/roof is made of plastic sheeting stretched over plastic pipe hoops positioned as half circles. The hoops give the greenhouse a perfect half cylinder shape with each half-circle hoop having a diameter of 36 feet. In cubic feet per minute, what is the approximate size fan needed to ventilate the greenhouse?

10,173.6 cubic feet per minute

Each cylinder in a six cylinder tractor engine has a bore (diameter) of 4.56 inches and a piston stroke of 6.45 inches. What is the approximate total displacement of this engine in liters?

10.4 liters

A utility tractor is re-equipped with high profile tires (larger diameter than the factory equipped tires). If the original tires had a 40.5-inch outside diameter and the new larger tires have a 43.9-inch outside diameter, what is the approximate speed of the tractor (miles per hour, with larger diameter tires) when the tractor's mechanical speedometer displays 10 miles per hour? Assume all tires are properly inflated, tires have no slippage, and the speedometer is still calibrated for the smaller diameter tires

10.84 mph

A 12 horsepower single-cylinder engine is operating at 5,150 feet above sea level. What approximate horsepower can be produced by this engine if the engine's power is reduced 1.75 percent for each 1000 feet of elevation above sea level?

10.9 horsepower

A tractor fueled by No. 2 diesel burns 8.45 gallons per hour. When the same tractor is fueled with B20 biodiesel it burns 75 gallons of fuel in eight hours. Approximately what percentage does the gallons of fuel per hour (consumption) increase when the tractor is fueled by B20 biodiesel rather than No. 2 diesel?

10.95 percent

A thermometer calibrated in degrees Celsius (ºC) is used to measure the temperature during a feed processing operation that requires heating to 240 degrees Fahrenheit (ºF). What temperature on the Celsius thermometer is approximately equal to 240 ºF?

115.6 ºC

Non-metallic cable shall be secured by staples or similar fittings designed as not to damage the cable at intervals not exceeding _____ inches of every outlet box, junction box, cabinet, or fitting.

12

How much torque in pound-feet (lb-ft) is produced by a 60 pound force pushing on a lever arm that is 24 inches long?

120 lb-ft

A planter has a 24-foot effective swath width, it travels at 5.25 miles per hour, and it operates with a field efficiency of 88.5 percent. What is the approximate effective field capacity (EFC) of the planter in acres per hour?

13.5 acres per hour

A gasoline mower's power takeoff (PTO) produces 25 horsepower and turns at 1000 revolutions per minute. Approximately how much torque, in foot-pounds, can this PTO produce?

131.3 foot-pounds

Each cylinder in an eight cylinder tractor engine has a bore (diameter) of 4.85 inches and a piston stroke of 6.25 inches. What is the approximate total displacement of this engine in liters?

15.1 liters

A 120-volt electrical circuit will operate a 2400-watt resistance heater and ten 300-watt incandescent light bulbs. If the circuit is operated 10 hours each day for 300 days, how many kilowatt-hours will the electrical system use during the time period?

16,200 kilowatt-hours

A variety of incandescent lights are all operating on a single 120-volt electrical circuit in a livestock barn. The circuit includes six 150-watt lights, two 300-watt lights, and twelve 40-watt lights. What is the amperage of the circuit with all of these lights operating?

16.5 amps

A rectangular shaped plastic hopper is used to transport granular fertilizer in bulk. This hopper is transported on a trailer with a 4500-pound maximum load carrying capacity. The internal dimensions of the hopper are 7.25 feet wide, 8.25 feet long and 4.5 feet deep. What is the maximum weight in pounds per cubic foot (approximate value) that granular fertilizer can weigh and completely fill the hopper, while still transporting the load within safe limits?

16.7 lbs / ft3

A 200 horsepower eight-cylinder engine is operating at 6865 feet above sea level. What approximate horsepower can be produced by the engine when the engine's power is reduced 2.45 percent for each 1000 feet of elevation above sea level?

166.4 horsepower

A hydraulic cylinder that operates the arm of a skid steer loader has a bore diameter of 2.9 inches and a stroke of 36 inches. The tractor's hydraulic system produces a maximum pressure of 2,600 pounds per square inch. Approximately, what is the maximum force the cylinder can exert on the lift arm?

17,165 pounds

A tractor's power takeoff produces 325 horsepower and turns at 1000 revolutions per minute. Approximately how much torque, in foot-pounds, can this PTO produce?

1706.9 foot-pounds

If a four-stroke cycle engine is operating at 3600 rpm, what is the rpm of the camshaft?

1800 rpm

A gasoline mower's power takeoff (PTO) produces 20 horsepower and turns at 540 revolutions per minute. Approximately how much torque, in foot-pounds, can this PTO produce?

194.5 foot-pounds

A hot waterline is used 6 hours and 45 minutes each day, has three different water leaks, and the amount of water lost at each leak has been measured during a 30 minute time period. The three quantities of water from the leaks are (a) 75 ounces, (b) 68 ounces, and (c) 111 ounces. Approximately how many gallons of water will be lost from the waterline during 100 days of operation?

2,679 gallons

A water pump has a 4.75-inch diameter pulley that must turn at 800 revolutions per minute (rpm). The shaft of a electric motor rotates at 1725 rpm and powers the belt that operates the pump. What is the approximate diameter of the pulley needed on the motor shaft to turn the pump at 800 rpms?

2.2 inches

What size circuit breaker should be used to protect a copper wire, type NM 12/2 with ground?

20 ampere

A rectangular shaped plastic hopper is used to transport granular pesticide in bulk. This hopper is transported on a trailer with a 5000-pound maximum load carrying capacity. The internal dimensions of the hopper are 6.5 feet wide, 8.75 feet long and 4.25 feet deep. What is the maximum weight in pounds per cubic foot (approximate value) that granular pesticide can weigh, completely fill the hopper, and still transport within safe load carrying limits?

20.7 lbs / ft3

What is the approximate annual power consumption (kilowatt-hours, kWh) of a 240 volt electrical installation with 36 lights, each light using 0.95 amps and operating an average of 9 hours and 30 minutes each day, and 22.5 days per month?

21,053.5 kWh

An intake and/or exhaust fan should have the capacity in cubic feet per minute to completely exchange the air in a greenhouse every ten minutes. The rectangular floor of a greenhouse measures 30 feet by 60 feet and the walls and roof are made of plastic sheeting stretched over plastic pipe hoops positioned as half circles. The hoops give the greenhouse a perfect half cylinder shape with each hoop having a diameter of 30 feet. In cubic feet per minute, what is the approximate size fan needed to ventilate the greenhouse?

2119.5 cubic feet per minute

Concrete is poured inside a vertical pipe to provide rigidity to the pipe. If 1.25 cubic yards of concrete are needed to fill the pipe that is 12 feet 5 inches tall, what is the approximate inside diameter of the pipe in inches?

22.33 inches

An available electronic thermometer is calibrated in degrees Celsius (ºC). A pesticide label specifies that the maximum allowable temperature for spray applications is 75 d

23.9 ºC

Approximately how many acres are in a rectangular field measuring 1109 meters by 928

232.5 acres

A utility tractor is re-equipped with high profile tires (larger diameter than the factory equipped tires). If the original tires had a 38.9-inch outside diameter and the new larger tires have a 44.6-inch outside diameter, what is the actual speed of the tractor when the tractor's mechanical speedometer displays 25 miles per hour? Assume all tires are properly inflated, tires have no slippage, and the speedometer is still calibrated for the smaller diameter tires.

28.7 mph

If the average weight of wheat is 62.5 pounds per bushel, approximately how many bushels of wheat can be transported in a rail car with a maximum carrying capacity of 90 tons?

2880 bushels

Water flows through 119 feet of pipeline that includes five 90 degree elbows. The water flow rate is 5.25 gallons per minute where the water exits the 119-foot pipeline. The pressure loss through the pipeline is equivalent to 6.5 vertical feet of head (pressure) loss per 100 feet of horizontal run. The head loss through each elbow is equivalent to that of 4.25 feet of additional horizontal length. What is the approximate vertical head (pressure) loss for this horizontal pipeline?

29 feet of head loss

What is the approximate speed, in miles per hour, for a fertilizer spreader that travels 115 meters in 1 minute and 9 seconds?

3.7 miles per hour

When using a 3/32 E6011 welding electrode on a Lincoln 225 AC welder, what arc length should be maintained.

3/32 inch

A water supply station used to refill pesticide tanks has a 4 horsepower electrical pump that operates at 120 volts. If the motor is 85 percent efficient and has a 0.9 power factor, what is the approximate amperage of the motor?

32.5 amps

An electric water heater uses 1910 kilowatt-hours (kWh) of power each day. If electric power cost 14.75 cents per kWh, approximately how much energy (in therms) does this water heater use during 60 days of operation?

3910 therms

The round support column (cylinder) in a building is a vertical steel pipe with an outside diameter of 36 inches. The pipe has a wall thickness of 1/2" and will be filled with concrete. If the 18- foot tall pipe is to be completely filled, approximately how many cubic-yards of concrete are needed?

4.45 cubic yards

A water pump has a 6.75-inch diameter pulley that must turn at 1150 revolutions per minute (rpm). The shaft of an electric motor rotates at 1725 rpm and powers the belt that operates the pump. What is the approximate diameter of the pulley needed on the motor shaft to turn the pump at 1150 rpms?

4.50-inch diameter pulley

The Universal Soil Loss Equation is composed of six factors to predict the longterm average annual soil loss and one of those values is the slope of the land area expressed as a percentage. What is the approximate slope (percentage) of the land that changes elevation from 2255 feet to 1876 feet over a distance of 1.58 miles?

4.54 %

Each cylinder in a four cylinder engine has a circumference of 11.6 inches and a piston stroke of 6.5 inches. What is the approximate total displacement of the engine in liters?

4.6 liters

Approximately how many acres are in a rectangular field measuring 2147 yards by 984 meters?

477.4 acres

Which of the following will have the greatest weight: 0.0039 acre-feet of water, 170 cubic-feet of water, 1275 gallons of water, or 4850 liters of water?

4850 liters of water

A pesticide label specifies that 0.75 pint of pesticide concentration, mixed with 25 gallons of water, are to be applied per acre. Approximately how many gallons of pesticide concentration are required to treat a 522-acre field?

49 gallons

Which of the following will have the lowest weight in pounds: 5.47 gallons of gasoline, 4.97 gallons of diesel, 4.71 gallons of 15W-40 engine oil, or 4.72 gallons of automatic transmission fluid?

5.71 gallons of 15W-40 engine oil

A concrete slab will be installed to prevent contamination of the ground at a mixing and cleaning site for pesticide equipment. The inside dimensions of the slab's form boards are 24 feet wide by 14 feet long and the concrete forms provide an approximate depth of 5 inches. Order an additional 10 percent concrete to allow for any inconsistencies in the ground surface and note that pre-mixed concrete is sold/delivered in quarter-yard quantities (such as: 3 yd3, 6.25 yd3, 10.75 yd3, 15.5 yd3). Approximately how many cubic yards (yd3 ) of pre-mixed concrete should be ordered?

5.75 yd3

If a center pivot irrigation system is 0.5 mile long (has a 0.5 mile radius), approximately how many acres can be irrigated under the pivot's boom during 360 degrees of travel?

502.4 acres

Approximately how many acres are in a rectangular field measuring 5,040 meters by 4,867 yards?

554.3 acres

Each of two hydraulic cylinders raise and lower the arms that operate the bucket on a skid steer loader. Each cylinder has a bore diameter of 3.25 inches and a stroke of 36 inches. The tractor's hydraulic system produces a maximum pressure of 3,600 pounds per square inch. Approximately, what is the maximum combined force that these two cylinders can exert on the lift arms?

59,699 pounds

The National Electrical code requires that a minimum of ________ inches of free conductor, measured from the point in the box where it emerges from its raceway or cable sheath, shall be left at each outlet, junction, and switch point for splices or the connection to luminaries or devices

6

A storage tank is shaped like a capsule with the following internal dimensions. The radius of the one-half spheres on each end are 21~9/32" and the height of the cylinder section is 6' 9~15/16". What is the approximate internal volume in gallons for this tank?

679.1 gallons

An inefficient electrical motor (identified as motor A) is to be replaced with a new high efficiency motor (identified as motor B). Motor A was operated 8 hours and 30 minutes per day, 322 days each year, and its annual electrical bill averaged $18,983. The purchase price for motor B is $1,318 and the installation charge is $390. Motor B will be operated the same number of hours as motor A and will have an average cost of $5.87 per hour to operate. Approximately how many months must motor B operate to payback the purchase and installation cost of the new motor?

7 months

A pesticide spray tank has a cylindrical shape that is 7 feet 9 inches long with a radius of 2 feet. What is the approximate total storage capacity of the tank in gallons?

728 gallons

A variety of incandescent lights are all operating on a single 120-volt electrical circuit in a livestock barn. The circuit includes two 200-watt lights, four 100-watt lights, and five 60-watt lights. What is the amperage of the circuit with all of these lights operating?

9.2 amps

A rectangular shaped plastic hopper is used to transport granular pesticide in bulk. This hopper is transported on a trailer with a 4,500-pound maximum load carrying capacity in addition to the weight of the hopper. The internal dimensions of the hopper are 7.75 feet wide, 11.75 feet long and 5.25 feet deep. What is the maximum weight in pounds per cubic foot (approximate value) that granular pesticide can weigh, completely fill the hopper, and still transport within safe load carrying limits? 1 gallon = 231 cubic inches 1 cubic-foot = 1

9.4 lbs / ft3

What is the approximate speed, in miles per hour, for a fertilizer spreader that travels 200 yards in 43.5 seconds?

9.4 miles per hour

An engine manual requires each head bolt to be torqued to 16 Newton meters (Nm) during reassembly. The torque wrench available is calibrated in foot pounds (ft. lbs.). What approximate torque in ft. lbs. is equivalent to 13 Nm?

9.6 ft. lbs.

A 100 horsepower six-cylinder engine is operating at 5,400 feet above sea level. What approximate horsepower can be produced by the engine if the engine's power is reduced 1.5 percent for each 1000 feet of elevation above sea level?

91.9 horsepower

There is concern that the numerical values marked on a 500 gallon pesticide spray tank are inaccurate and water weight will be used to determine and confirm tank volume values. The weight of the empty tank is 92 pounds. What should the approximate combined weight (pounds, lbs) be for the tank and water if the test weights are done at 100 gallons, 250 gallons and 500 gallons?

926 lbs for 100 gallons; 2177 lbs for 250 gallons; 4262 lbs for 500 gallons

If a center pivot irrigation system is 0.25 mile long (has a 0.25 mile radius), approximately how many acres can be irrigated under 270 degrees of the pivot's travel?

94.2 acres

A farm building that is poorly insulated is located in a zone of the U.S. that typically requires 45 BTUs per square-foot of floor area to adequately heat the interior. If the interior dimension of the rectangular building is 80 feet by 24 feet and the model of furnace being purchased is 90% efficient, what approximate size furnace is required?

96,000 BTUs

The GMAW welding process typically uses which of the following types of electrodes? a. continuous wire b. tungsten c. consumable "stick" electrode d. no electrodes are used in the GMAW process

A

The output of a welder is relatively: a. low voltage and high amperage b. high voltage and low amperage c. high voltage and high amperage d. low voltage and low amperage

A

Which of the following small engine components rotate in the same direction? a. crankshaft and flywheel b. crankshaft and camshaft c. flywheel and camshaft d. they all rotate in the same direction

A

Circuit breaker

A reusable safety switch that breaks the circuit when the current becomes too high

Which of the following is not an acceptable clothing material to be worn while welding? a. Cotton b. Elastane c. Wool d. Leather

B

Which of the following quantities of lumber has the greatest number of board-feet? A. 6 boards measuring 2 inches by 10 inches by 10 feet B. 9 boards measuring 2 inches by 6 inches by 12 feet C. 12 boards measuring 1 inch by 8 inches by 12 feet D. 12 boards measuring 1 inches by 10 inches by 10 feet

B. 9 boards measuring 2 inches by 6 inches by 12 feet

If performing an overhead weld, which of these rods are designed for this position and while also having a tensile strength of at least 65,000 pounds per square inch? a. E6013 b. E6020 c. E7018 d. E7024

C

Which of the following quantities of lumber has the greatest number of board-feet? A. 20 boards measuring 1 inches by 10 inches by 10 feet B. 20 boards measuring 1 inch by 8 inches by 12 feet C. 14 boards measuring 2 inches by 6 inches by 12 feet D. 10 boards measuring 2 inches by 10 inches by 10 feet

C. 14 boards measuring 2 inches by 6 inches by 12 feet

The __________ is an engine component that converts the linear motion of the piston into rotary motion.

Crankshaft

Shielded metal arc welding is also called: a. brazing b. electrode welding c. Mig Welding d. Stick Welding

D

Which of the following gases would not be used as a shielding gas for GMAW welding? a. argon b. carbon dioxide c. helium d. acetylene

D

Which of the following is not a factor when selecting GMAW machine settings. a. thickness of metal to be welded b. shielding gas c. wire electrode diameter d. ambient air temperature

D

The proportion of time that a welder can operate without overheating is known as its __ .

Duty Cycle

_____ is an arc welding process that produces an arc between a continuous wire electrode and the base metal, creating a weld pool in the presence of a shielding gas. This process is also sometimes known as MIG welding or wire welding.

GMAW

The most common fuel used in small engines is

Gasoline

The relationship between voltage, current, and resistance in an electrical circuit and states that current in a circuit is proportional to the voltage and inversely proportional to the resistance.

Ohm's Law

The bottom ring of a set of piston rings is called the __________ ring.

Oil

A 240-volt air conditioning unit uses 124 kilowatt hours of power during 24 hours of operation. What is the approximate size of this air conditioning unit in tons of refrigeration (disregard efficiency)?

One and One-Half Tons

The __________ acts as the movable end of the combustion chamber and must withstand pressure fluctuations, thermal stress, and mechanical load.

Piston

Amperage is a measure of

Rate of current

Radiator Cap

Responsible for maintaining pressure in the system, and allowing coolant to transfer between the coolant reservoir and the radiator

Which of the following components would not be found in an engine that uses diesel as a fuel source? a. crankshaft b. intake valve c. spark plug d. compression ring

Spark plug

Distributor Cap

The nonconductive cap of the distributor that contains the contacts leading to each individual spark plug.(p.s) they don't run right when water in it from personal experience

Radiator

The part of a car engine which removes heat from the cooling water that circulates through the engine

engine Alternator

Three windings for three functions: 1. NG signal to cockpit tachometer. (green) 2. Ignition power to the exciters during start. (yellow) 3. DEC power. (yellow) Loss of alt. does not result in high side failure

. __________ is the point at which the piston is closest to the cylinder head

Top dead center

s the point at which the piston is closest to the cylinder head

Top dead center

Crankshaft

Turns the piston's up and down motion into circular motion

camshaft

a rotating shaft within the engine that opens and closes the intake and exhaust valve in the engine

Turbocharger

a supercharger driven by a turbine powered by the engine's exhaust gases

Pistons are usually made from a high-grade ______________ because of its light weight and high conductivity of heat.

aluminum alloy

starter

an electric motor for starting an engine

White insulated conductors used as the ungrounded conductor in an electrical circuit must

be re-identified by marking tape, paint, or other effective means

A __________ is a component used to reduce friction and to maintain clearance between stationary and rotating components of an engine.

bearing

During the compression event in a four-stroke engine _______________.

both valves are closed

The wire through which electric current travels is called a:

conductor

The best material for conducting electricity is________ because it is durable, has excellent conducting properties, and has proven to be relatively free from problems over time.

copper

When storing gasoline in a fuel can for longer than 60 days, __________ should be added to the gasoline to keep the fuel fresh and prevent corrosion and gum or varnish buildup

fuel stabilizer

Soldered

jointing of two metals

a drawing that contains the logic for an application and is typically used to test and troubleshoot hardwired applications. They are used as representatives of the logical sequence of steps that occur in a control circuit.

ladder diagram

A switch rated in horsepower that is capable of interrupting the maximum operating overload current of a motor of the same horsepower rating as the switch at the rated voltage.

motor-circuit switch

Receptacles installed to serve the countertop surfaces in kitchens

must have ground fault circuit interrupter protection

The engine component that slides back and forth due to forces produced during the combustion process acting as the movable end of the combustion chamber.

piston

A _____ is an isolated circuit contact that is used to activate individual circuits

pole

duplex receptacle

receptacles with two outlets; usually rated at 15 amps and wired at 115 volts

A _____ is a device that controls one electrical circuit by opening and closing contacts in another circuit.

relay

Water pump

the pump in the cooling system of an automobile that cause the water to circulate

In a 120-volt circuit, the grounded conductors are connected to

the silver terminals on outlets

In the GTAW process, the non-consumable electrode is in the form of a

tungsten electrode

GMAW welding machines produce constant _____ with different _____ levels, depending on welding conditions.

voltage, current

Aluminum Wire

• Is strong, malleable wire which is easy to shape • Is available in 12, 20, 22, 24, 26 and 30 gauge wire • Adds impact to structures such as a base for corsages