- - AGRICULTURAL CORE CURRICULUM - - (CLF2000) Advanced Core Cluster: AGRICULTURAL MECHANICS (CLF2650) Unit Title: ELECTRICITY ____________________________________________________________________________ (CLF2699) Topic: ELECTRICITY Time Year(s) UNIT EXAM 1 hour 1 /2 /3/ 4 ____________________________________________________________________________ NAME ____________________________ DATE ____________________________ PER. ____________________________ A. True or False 1. _____ Electricity is present in all matter. 2. _____ Electrons carry a positive electrical charge and orbit around the center of the atom. 3. _____ When free electrons move randomly from atom to atom, their energy is small. 4. _____ The speed of electric current is greater than the speed of light. 5. _____ Fuses or breakers with an amperage larger than the wire's amperage will not protect the circuit from overheating. 6. _____ Stranded wire improves flexibility and conductivity. 7. _____ Electricity travels on the outer surface of wires. 8. _____ Aluminum conductors require one wire size larger than copper wire to provide the same amperage. 9. _____ The cable marking, 12-2 w/g, indicates that the cable has one black 12 gauge wire and one white 12 gauge wire and is water resistant guaranteed. 10. _____ Electric cable is generally used for permanent indoor installation. 11. _____ In electrical work, e.m.t. stands for emergency medical treatment. 12. _____ Type THWN wire is used in dry locations with high temperatures. 13. _____ A wire splice cannot be expected to conduct electricity as well as the unspliced wire. 14. _____ When stripping a wire with a knife, the knife should be held a 90-degree angle to the wire and run around the wire to cut the insulation. 15. _____ When replacing insulation with plastic electrician's tape, it should be wrapped around until the layers equal the thickness of the insulation removed. 16. _____ The white or neutral wire is attached to an electrical switch in a circuit. 17. _____ The black wire is the hot wire in an electrical circuit. 18. _____ A circuit test light can be made from a pigtail light socket. 19. _____ A 220 volt circuit has two 110 volt hot wires and one neutral wire. 20. _____ Bulbs of different wattage can be installed in a homemade, pig-tail socket, test light to test circuit voltage. B. Matching 1. _____ A non-random flow of electrons a. watt 2. _____ A measure of electron flow b. fault 3. _____ Electrical pressure c. insulator 4. _____ A measure of electrical pressure d. short 5. _____ A material through which electrons e. ampere can flow freely 6. _____ A material that provides great f. voltage resistance to electron flow 7. _____ A measure of resistance g. U.L. 8. _____ A measure of electrical power h. electric current 9. _____ A direct connection between a hot wire i. volt and a ground connection 10. _____ A leakage of current from a hot wire j. conductor to a ground connection 11. _____ Abbreviation of the name of an organization that tests electrical products for safety k. ohm 12. _____ Used to join two wires together so l. planetary the joint is as strong as the unspliced wire 13. _____ Used when one wire must be tapped m. short circuit into another at some point other than at its end 14. _____ Used to join wires where there will n. valence be no strain 15. _____ A break in the circuit so that the o. atom current cannot flow 16. _____ A current flow around the circuit p. branch splice resistance and back to the source 17. _____ Providing an additional connection q. open circuit between a piece of electrical equipment and the earth 18. _____ Electrons not readily moved from their r. end splice orbits 19. _____ Electrons loosely held in an atom's s. rat-tail splice outer orbit 20. _____ The smallest amount of an element that t. grounding retains all the properties of the element C. Multiple Choice 1. Which symbol in the equation, I = E/R (Ohm's Law), is not defined properly below? a. I equals insulation in amperes. b. E equals potential energy in volts. c. R equals resistance in ohms. d. None of the above. 2. At which level of amperage does a fatal shock usually occur? a. 5 milli amps b. 10 milli amps c. 15 milli amps d. None of the above. 3. Which copper wire gauge size has the wrong ampere rating? a. No. 14, rated for 15 ampere circuits. b. No. 12, rated for 20 ampere circuits. c. No. 10, rated for 25 ampere circuits. d. None of the above. 4. Which item listed below is not a part of a simple circuit? a. A hot wire and a neutral wire. b. Electrical boxes and outlets. c. Fixtures and switches. d. A voltage transformer. 5. Overcurrent protection devices are connected to which wire in a circuit? a. Black b. White c. Green d. Bare 6. To which terminal screw on a duplex outlet is the black wire connected? a. Silver or white b. Gold or yellow c. Green d. None of the above. 7. A simple three-prong outlet tester can test all but which of the following? a. Open ground b. Hot and ground wire reversed c. Open neutral d. Circuit voltage 8. Which is the best conductor of electricity? a. aluminum b. copper c. silver d. iron 9. Which of the following materials is not a good insulator? a. glass c. plastic c. rubber d. leather 10. Since one watt is equal to one volt pushing one ampere through a conductor (W = VA), how many watts would be produced by 110 volts pushing 10 amperes? a. 11 b. 120 c. 1100 d. 11000 Answer Sheet A. True and False B. Matching C. Multiple Choice 1. t 1. h 1. a 2. f 2. e 2. b 3. t 3. f 3. c 4. f 4. i 4. d 5. t 5. j 5. a 6. t 6. c 6. b 7. t 7. k 7. d 8. t 8. a 8. c 9. f 9. d 9. d 10. t 10. b 10. c 11. f 11. g 12. f 12. r 13. f 13. p 14. f 14. s 15. t 15. q 16. f 16. m 17. t 17. t 18. t 18. l 19. t 19. n 20. t 20. o 6/20/91 OLR/tf #%&C