Page 1 ELTECH 113 Lecture (Ouiz #1, In Class) Date : Thursday, (5 :30 pm - 6 :45 pm) Instructor : Bret Allen

Transcription

1 ':_~ 4~~ Z ṭ.1 Page 1 ELTECH 113 Lecture (Ouiz #1, In Class) Date : Thursday, (5 :30 pm - 6 :45 pm) Instructor : Bret Allen Instructions : Select the best possible answer from each of the following thirty-five (35) multiple choice questions : 1. The smallest particle into which an element can be divided without losing its identity is the : atom b. molecule c. neutron. proton 2. A negative charged particle of an atom is the : electron b. molecule c. neutron d. proton The like charges of two electrons will cause them to : a. attract repel c. neither attract nor repel d. cannot tell What is the most commonly used conductor in electronics? a. aluminum copper gold d. silver 5. Electrical current is defined as the movement of which subatomic particles? electrons b. molecules c. neutrons d. protons 6. Current equals : coulombs/time b. coulombs x time c. voltage/time d. voltage x time

2 Page 2 7. The earliest electrical researchers believed that current flowed from a positive potential to a negative potential. This type of current flow i_ now called : a. conductance conventional. electron d. voltage 8. Electromotive force (emf) is measured in : a. amps b. coulombs 0 volts d. watts 9. If a fluid system is compared to an electrical system, the fluid pump will correspond to a : b. c. d. battery conductor current lamp 10. If an electrical system is compared to a fluid system, then electrical current corresponds to the : a. pressure b. pump water flow d. water wheel 11. A burned out lamp filament will cause :. a short in the lamp an open in the lamp. a short in the fuse d. an open in the fuse 12. When an electronic component fails due to a short circuit, the event will cause : --, an increase in current - b. a decrease in current c. the current to stop flowing d. no change in the current flow 13. If an electronic component fails by developing an open circuit, the current will : a. increase b. decrease cease d. not change

3 Page A circuit in which current is flowing is considered : >O closed b. open c. shorted d. disconnected 15. An open circuit may be caused by a : a. closed switch b. shorted component --: >Q blown fuse d. solder bridge 16. The Battery symbol is : a. I -->(E) I I c. III d. IV T If circuit resistance decreases from 10 ohms to 8 ohms, then the current in the circuit will : - ti increase.a,.. b. decrease c. remain the same d. cannot tell 18. Which of the following formulas is a form of ohm's law? a. V = I /R b. I R/V - T R = V/I d. V = R/I

4 Page If resistor voltage resistor value? - a ohms b. 0.3 ohms c. 3.0 ohms ->(D 30 ohms is 3 V with 0.1 A flowing through it, -f' V= -Te IC T 3V _ A 20. What electromotive force would cause 20 A of current to flow through a 500 ohm resistor? a V A b 2.5 V c V --~ 10, 000 V V ~. /~, Ova k10 C. 7-S 21. How much current will flow through a 1 k ohm resistor, when it is connected to a 1.5 V battery? -~ ao ma b. 666 ma c. 666 A d. 1.5 ka 22. The rate at which work is performed is called : a. current b. energy --><Z) power d. voltage 23. How much power does a resistor dissipate when a 9 V battery causes 2 A ' - of current to flow through it? a W b. 4.5 W (~ V ) ) ^ 8 --.b'~ 18 W d w 24. How much current does a 1.5 kw, 120 V heater use? a ~ta b. 80 MA A d. 180 ka -j- - -' v ra~ v what is the r 3v-D- 25. How many ohms of resistance would a 120 V, 200 W lamp filament have? a. 0.6 ohms b_ 1.67 ohms 72.0 ohms d. 333 ohms 6 070V) _ 7 d, o

5 Page What is the current flowing in this circuit? a. 3.3 ma 0.33 ma c ua ~ _ - - d ~ta._-h-- D a3 1/ ^, edv033.~ V1 ed, 33 m A "' 23mV R1 ~ 690hm 27. What is the battery voltage? a. 1 V Q 0. 1 V 10 mv d. 1 mv 690hm = 0 - -Z l/ol.7-s 28. What is the power dissipated by the light bulb? 250 W b. 25 W c. 2.5 W d. 250 mw ELTECH 113 Lecture (Quiz #l,

6 Page What is wrong with this circuit? a. Nothing. b. Rl is open. Rl is shorted. d. Battery is dead. 3.3k Ohm 30. Which of the following is a voltage source? --->a battery b. 1amp c. resistor d. ground 31. Like poles of two magnets will : a. attract repel neither attract nor repel demagnetize 32. A good fuse will measure : zero ohms resistance b. a medium resistance c. a high resistance d. infinite resistance 33. A circuit breaker can be used to replace a : a. battery c. fuse relay d. thermocouple

7 Page If the battery will last for 256 hours, what is the battery amp-hour ' rating? a. 420 amp-hours b. 920 amp-hours c 1420 amp-hours T amp-hours 5 f 1 P - L V1 75V 1 C 100hm ~/yt s5 A7E,? 5-4; Ldw,4`5- N~ _ l ~a~o f~/ytr4- l~ou~_ 35. What is the minimum value of the fuse? a. 1 amp b. 3 amp 5 amp _, d. 7 amp '- U1 s TS R1 260hm 5 : r2t _- mil 1 M ~~ L v = 5~ TNz~ s ~s T~~ 3~ s~ /el/\/ 5 w'f2 U~~~ S~512 or'' C Ho,1CE 5 G I-vft,/,:? 4 Z~0~) -END OF QUIZ #1-