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NEIEP 600 Electrical Exam Practice — Journeyman & Apprentice Test Prep exam set study guide NEW!!! 1. when a cam or vane is moved close to a magnetic levieing switch what occurs?: the switch changes its satate 2. what is meant by the normal state of relay contacts?: contact state without current applied to the coil 3. what type of wave form is generated by two pole ac generator in one complete revolution?: one full AC cycle 4. what defines the the period of a ac waveform ?: the time it takes to complete one full cycle . 5. what is the period of a 120 hz: .00833 seconds 6. a sine wave beginning at 0 degrees will reach positive and negative peaks at what two points ?: 90 and 270 degrees 7. what is it meant by the term peak to peak voltage ?: voltage between positive and negative peaks 8. the expression 0.636Xpeak voltage best describes what?: voltage or current average 9. what best describes the term AC effective voltage ?: the AC voltage required to produce the same power as a DC voltage 10. what is the peak voltage of a waveform with 480 VAC RMS?: 679 volts 11. what effect an inductor has on current flow ?: it opposes change 12. what is the secondary voltage of a 5 to 1 step down transformormer whith a primary voltage of 125 volts: 25 volts 13. the primary of a 5 to 1 step down transformer has 1 amp . what is the secondary current?: 5 amps 14. how can three phase voltage be stepped down using transformer ?: by using a three phase transformer or three single phase transformers 15. in capacitors , what is the purpose of the dielectric ?: prevent acring within the capacitor 16. which of the following is true about capacitors in ac CUIRCUITS .?: current leads voltage all the time 17. what describes a capacitor's ability to store an electrical charge: capaci- tance 18. what is the time constant for a circuit with 150 k ohms and 2 microfarad capacitor?: .3 seconds 19. which of the following satements is correct about polorized electrolytic capacitors: voltage polarity must be correct 20. what happends in a cuircuit , when the capacitor voltage equals the source voltage ?: current flow stops in the cuircuit 21.in adc cuircuit when capacitors are present , when is current maximum ?: the instant when power is applied 43. Emits light when properly biased: LED 44. What is the voltage drop across a silicon diode that is forward biased?: .7 volts 45. What happens to a forward biased silicon diode when the barrier voltage is exceeded?: The diode conducts 46. What are the terminal designations on the diode?: Anode, cathode 47. What type of rectifier uses four diodes to convert the AC to DC?: Full-wave bridge 48. Will a good diode with a multimeter on the ohms setting read a very low or very high resistance across the diode when it is forward biased?: very low 49. are zener diodes designed to operate in reverse or forward bias mode?: - reverse 50. What are varistors used for?: to prevent component damage from surges 51. Will conduct when exposed to light if connected with reverse bias: photo- diode 52. What is normally used to remove ripple voltage from a full wave rectifier?- : Add capacitors and inductors after the rectifier diodes 53. A discrete electronic component: silicon controlled rectifier 54. What type of signal varies continuously in frequency and amplitude?: Ana- log 55. What uses a transistor located in series with the load?: series regulated power supplies 56. Op amp that develops an output that is proportional to the amplitude of input times the duration of the input signal.: integrator 57. Are zener diodes connected reverse or forward biased in a circuit?: reverse 58. if current through the load increases, current through the zener decreases. This describes what type of regulator?: Shunt regulator 59. What is the base 16 system commonly called?: hexadecimal 60. What numbering system uses one of the tow digits to represent each positional value?: Binary 61. Method of the proper care and handling of printed circuit boards.: Always remove power when installing or removing the boards. 62. The type of voltage arrangement associated with the driver circuit with the output at the potential of the power supply to the circuit?: source 63. What is the binary equivalent of 17(10): 0001 0001 64. What is the binary equivalent of 68(10): 0100 0100 65. What is the hexadecimal equivalent of 001 1101(2): 1D 66. What is the hexadecimal equivalent of 0010 1111 1001(2): 2F9 67. Type of voltage arrangement associated with a driver circuit with an output at ground potential when active.: sink 
