Quiz on Electrical Fundamentals - PDF

1. In a current-controlled current source, the coefficient of i is the: a) transconductance c) transresistance e) none of these b) current gain d) voltage gain 2. In a voltage-controlled current source, the coefficient of voltage v, is...

1. In a current-controlled current source, the coefficient of i is the: a) transconductance c) transresistance e) none of these b) current gain d) voltage gain 2. In a voltage-controlled current source, the coefficient of voltage v, is the: a) transconductance c) transresistance e) none of these b) current gain d) voltage gain 3. In a voltage-controlled voltage source, the coefficient of voltage v, is the: a) transconductance c) transresistance e) none of these b) current gain d) voltage gain 4. In a current-controlled voltage source, the coefficient of voltage v, is the: a) transconductance c) transresistance e) none of these b) current gain d) voltage gain 5. Which of these is not an electrical quantity? a) charge c) power e) current b) time d) voltage 6. The maximum current that a 2 W, 80kΩ resistor can safely conduct is: a) 160 kA c) 25 μA e) none of these b) 40 kA d) 5 mA 7. The maximum voltage that a 5 W, 40kΩ resistor can safely handle is: a) 25 mV c) 1 kV e) none of these b) 40 V d) 1 MV 8. What is the energy stored in a 5-V cellphone battery rated at 31,000 mAh? a) 558 MJ c) 234 kJ e) none of these b) 0.558 MJ d) 65 kJ 9. How much electric charge is in a 5.0-V phone battery if the amount of energy stored in it is 189kJ? a) 10,500 mAH c) 10,500 AH e) none of these b) 37.8 kAH d) 37.8 AH 10. The name of the moving particle in electricity field is called a) voltage c) joule e) none of these b) current d) electron 11. The following are all unit of energy except, a) joule c) kilowatt-hour e) watt-second b) electron volt d) ampere-hour 12. The conductance of the circuit that allows 300-μA of current to flow with 300-mV applied is: a) 1000μS c) 1 S e) none of these b) 2 mS d) 900 mS 13. Joule is a unit measure for: a) charge c) force e) watt-second b) energy d) power 14. The smallest unit of electric energy is called? a) watt-second c) electron-volt e) micro-joule b) watt-hour d) kilowatt-hour 15. The unit measure for a large quantity of electric energy is called a) watt-second b) watt-hour c) electron-volt  d) kilowatt-hour e) micro-joule 16. A German physicist who experimentally determined the most basic law relating voltage and current for a resistor. a)Andre-Marie c) Gustav Robert e) none of these Ampere Kirchhoff b) George Simon d) Alessandro Ohm Antonio Volta 17. It is the rate at which electric energy is fed to or taken from a device. a) voltage c) current e) watt-second b) power d) charge 18. Infinite resistance position of a switch means a) a short circuit or c) an open circuit or e) none of these ON position OFF position b) a short circuit or d) an open circuit or OFF position ON position 19. Zero resistance position of a switch means a) a short circuit or c) an open circuit or e) none of these ON position OFF position b) a short circuit or d) an open circuit or OFF position ON position 20. One joule is also equivalent to a) 1.602x10-19 eV c) 6.24x1018eV e) none of these 18 b) 1.602X10 eV d) 6.24x1019 eV 21. It is the material used to prevent the flow of current. a) conductor c) semiconductor e) inductor b) insulator d) resistor 22. How many Joule is equivalent to 3.0 KWH of electric energy? a) 10. 8 k c) 10.8 M e) none of these b) 833.33 m d) 10.8 G 23. A/an ______ is a circuit element that has a resistance approaching infinity. a) busted fuse c) open switch e) all except b b) normal fuse d) broken wire 24. What is the potential difference applied to a 330Ω resistor to make it convert 2.5 KWH of electric energy in 24 hour? a.) 158.8 V c) 34.375 kV e) none of these b) 5.86 V d) 185.4 V 25. What is the equivalent resistance of a 0.5-watt resistor with the following color bands: red green, violet, red, silver?: a) 2.57kΩ c) 255 kΩ e) none of these b) 25.7 kΩ d) 0.255 kΩ 26. What is the maximum resistance limit of a 6.2-kΩ ± 25% resistor. a) greater c) expand e) none of these b) lesser d) stronger 27. Component or any of the elements in a circuit absorbs power when the calculated power is a) negative b) positive c) neutral  d) either a or b e) none of these 28. Component or any of the elements in a circuit provides power when the calculated power is a) negative c) neutral e) none of these b) positive d) either a or b 29. A material that increases its resistance as temperature increases. a) negative b) positive c) the same temperature temperature temperature coefficient coefficient coefficient d) none of these 30. An intrinsic property that quantifies how strongly a given material opposes the flow of electric current. a) Resistance c) Resistivity e) none of these b) Conductivity d) Conductance 31. How many seconds will it take for a 72-Ω heater with a 6-A current to consume 9.4 kJ of energy? a) 21.76 c) 2.18 e) none of these b) 6.36 d) 3.63 32. The circular area of a wire doubles for every a) quarter gauge sizes c) half gauge sizes b) three gauge sizes d) two gauge sizes 33. In a standard wire gauge size, as the gauge number increases from 1-40, the diameter and the circular area. a) decrease c) expand e) none of these b) increase d) cut in half 34. The higher the gauge number and the thinner the wire, the _____ the resistance of the wire for any given length. a) better c) heavier e) greater b) lesser d) stronger 35. Electric power refers to: a) joule c) watt-second e) none of these b) volt-coulomb d) volt-ampere 36. Electric charge is measured in which unit? a) volt c) joule e) none of these b) coulomb d) watt 37. The law that describes the relationship between voltage, current, and resistance is called: a) Newton’s Law c) Ohm’s Law d) Current and b) Kirchhoff’s law voltage law 38. In a DC circuit, the current flow is: a) alternating c) fluctuating e) none of these b) constant d) normal 39. Which element has the lowest resistivity? a) silver c) gold e) none of these b) copper d) iron 40. What is the purpose of a rheostat? a) to control voltage b) to control current c) to store energy  d) to block current 41. A short circuit has resistance approaching: a) zero c) maximum e.) none of these b) infinity d) one 42. Which of the following materials is a semiconductor? a) copper c) gold e) none of these b) silicon d) rubber 43. Which factor does not affect the resistance of a conductor? a) temperature c) cross-sectional d) voltage b) length area e) none of these 44. In a parallel circuit, the total resistance is: a) always more than c) more than the reciprocals of the largest resistor smallest resistor resistances b) the sum of all d) the reciprocal of e) none of these resistances the sum of 45. The main property of a passive element is its ability to: a) generate energy b) store or dissipate c) increase voltage energy d) control current e) none of these 46. Which of the following statements is true about dependent sources is true? a) Their output b) They provide d) They generate depends on voltage constant voltage power without or current c) They are input elsewhere in the independent of e) none of these circuit other circuit elements 47. The current in a conductor varies inversely with: a) voltage c) temperature e) none of these b) resistance d) power 48. A resistor that does not obey Ohm's Law is called: a) linear resistor c) fixed resistor b) non-linear d) potentiometer resistor e) none of these 49. An ideal current source has: a) zero resistance c) variable e) none of these b) infinite resistance resistance d) zero voltage 50. An ideal voltage source has: a) zero resistance c) variable e) none of these b) infinite resistance resistance d) zero voltage 51. In figure 1, the power absorbed or supplied by E1. a) -48 W d) 32 W b) -32 W e) none of these c) 48 W 52. The dependent source in figure 1 is a: a) CCCS c) CCVS e) none of these b) VCCS d) VCVS 53. What is the coefficient of Ix of the dependent source Id in figure 1? a) current gain c) transconductance e) none of these b) voltage gain d) transresistance 54. The current Iy in figure 1 is: a) 2 A c) 6 A e) none of these b) 4 A d) 8 A 55. The voltage Vac in figure 1 is: a) 16 V c) 8 V e) none of these b) -16 V d) -8 V 56. The power absorbed or supplied by Id in figure 1 is: a) -48 W c) -96 W e) none of these b) 48 W d) 96 W 57. 1f 5 A, 10 A and 13 A fuses are available, state which is most appropriate for the following appliances which are both connected to a 240 V supply. (a) Electric toaster having a power rating of 1 kW (b) Electric fire having a power rating of 3 kW; a) 5 A and 10 A c) 10 A and 13 A e) none of these b) 5 A and 13 A d) both 13 A 58. The resistance of a 5 m length of wire is 600 ohms. Determine (a) the resistance of an 8 m length of the same wire, and (b) the length of the same wire when the resistance id 420 ohms. a) 960 Ω and 2.5 m c) 960 Ω and 3.5 m e) none of these b) 860 Ω and 3.5 m d) 860 Ω and 2.5 m 59. A coil of copper wire has a resistance of 10 Ω and 20°C. If the temperature coefficient of resistance of copper at 20°C is 3.93x10^-3/°C, determine the resistance of the coil when the temperature rises to 100°C. a) 13.2 Ω c) 6.86 e) none of these b)13.14 Ω d) 6.80 60. The resistance of a coil of aluminum wire at 18°C is 200 Ω. The temperature of the wire is increased, and the resistance rises to 240 Ω. If the temperature coefficient of resistance of aluminum is 3.90x10^-3°C at 18°C, determine the temperature to which the coil has risen. a) 68.89 °C b) 86.98 °C c) 69.28 °C d) 96.28 °C e) none of these