Q&A Hero

Q: 30. A loose or corroded connection in the neutral circuit will cause a. a decrease in resistance and an increase in voltage drop b. an increase in resistance and a decrease in voltage drop c. a decrease in resistance and a decrease in voltage drop d. an increase in resistance and an increase in voltage drop

Q: 15. Which of the following circuit voltage levels results in the most frequent occurrence of electrocution? a. 110v b. 220v c. 440v d. 7800v

Q: 31. When equipment is connected to a circuit having an "open ground," but equipped with a GFCI a. a fuse will blow or a breaker will be tripped b. the equipment will not operate c. the GFCI will be tripped d. the equipment will operate normally

Q: 16. Which of the following circuit voltage levels results in the most frequent occurrence of electrocution? a. 6v b. 12v c. 110v d. 220v

Q: 32. When a receptacle wiring tester is plugged into a receptacle that is wired correctly a. no indicators will light b. one indicator will light c. two indicators will light d. three indicators will light

Q: 17. Which of the following is the least important factor in determining whether an electrocution will take place? a. dampness at the point of contact b. body weight of the individual c. path of current through the body d. wounds in the skin where contact is made

Q: 33. When a receptacle wiring tester is plugged into a receptacle that has reversed polarity a. no indicators will light b. one indicator will light c. two indicators will light d. three indicators will light

Q: 18. Explain why electric shock can arrest the heart.

Q: 19. Fibrillation can sometimes be stopped by controlled electric shocks to reestablish the heart's natural rhythms.a. trueb. false

Q: 20. Fibrillation is due primarily to a. high voltage b. high current c. direct current d. alternating current

Q: 21. The standard frequency for alternating current is a. 20 Hz b. 60 Hz c. 110 Hz d. 220 Hz

Q: 22. The peakvoltage for an ordinary household A.C. circuit is approximately a. 60 b. 110 volts c. 150 volts d. 220 volts

Q: 23. The current drawn by a 60-watt table lamp circuit is approximately a. 1/2 amp b. 1 amp c. 5 amp d. 15 amp

Q: 24. Perspiration can lower skin resistance to electricity by as much as a factor of a. 2 b. 10 c. 100 d. 200

Q: 25. A typical 110-volt household circuit delivers 200 watts of power to an appliance, and another 20 watts of power are consumed by the circuit. There is no ground fault. The hot wire carries a 2 amp current.a. How much current is carried by the neutral?b. How much current is carried by the ground?c. What is the resistance of the circuit?

Q: 26. What is the full name represented by the abbreviation GFCI?

Q: 11. The most important factor in determining whether a person will be electrocuted when exposed to electric shock is whether the person has an inherent physical resistance to electrical hazards.a. trueb. false

Q: 91. Why should welding cylinder valves be turned off at the end of the shift in addition to turning off the torch valves?

Q: 12. Even body perspiration can provide the dampness that can make electrical contact fatal.a. trueb. false

Q: 92. Explain why precautions should be taken when welding equipment connected to oxygen and acetylene tanks is stored in the confined space of an equipment locker.

Q: 13. Public utility companies regulate the oscillation of alternating current to 60 hertz because this frequency has been found to be the most safe for exposure to the human heart muscle and thus to prevent most electrocutions.a. trueb. false

Q: 93. Why has the traditional "welding permit" system evolved into newer "hot work" permit systems?

Q: 94. Only the supervisor, not the welding operator, is authorized to sign a hot work permit.a. trueb. false

Q: 95. A fire watch is needed under which of the following conditions? a. Whenever a hot work permit is required. b. Whenever a welding permit is specified. c. Whenever combustible material in appreciable quantity is within 35 feet of the welding operation covered by a hot work permit. d. Whenever a licensed professional engineer deems that the fire watch is necessary.

Q: 96. When might a second fire watch be needed?

Q: 1. Weatherproof electrical outlets as seen installed on decks and patios are a. approved for Class I, Division 1 b. approved for Class I, Division 2 c. approved for Class III, Division 2 d. are not approved for hazardous locations

Q: 2. A paint spray booth in which flammable paints are used would be classified as a. Class I, Division 1 b. Class I, Division 2 c. Class II, Division 1 d. Class II, Division 2

Q: 3. Which of the following hazardous locations classifications is most hazardous? a. Class I, Division 2 b. Class II, Division 1 c. Class II, Division 2 d. Class III, Division 2

Q: 4. "Reversed polarity" means that a. the neutral and equipment ground are reversed b. the hot and equipment ground are reversed c. the hot and neutral are reversed d. none of the above

Q: 5. A common household circuit rated at 15 amps can carry approximately how many times as much current passing through the heart muscle as is required to produce heart fibrillation? a. twice as much b. five times as much c. ten times as much d. 200 times as much

Q: 6. Which of the following circuits causes the most electrocutions annually in the United States?a. 20 voltb. 110 voltc. 220 voltd. 440 volt

Q: 7. When one probe of a circuit tester contacts a hot wire and the other probe a neutral wire, a. the bulb will light b. a fuse or breaker or the tester bulb will blow c. the tester will be electrocuted d. OSHA will issue a citation

Q: 8. A certain string of Christmas tree lights has twenty bulbs, each rated at 3 watts. If there is no ground fault, how much current flows through the hot wire at the receptacle plug? Show calculations. How much flows through the neutral? Would the current flow likely be fatal if all of the current flowing through the hot wire would pass through a person's heart muscle?

Q: 9. Ordinary household 110v circuits are capable of electric shock but such shocks can be assumed to not be fatal.a. trueb. false

Q: 90. Which of the following types of welding is usually done with goggles instead of helmets with shades? a. flux-cored arc welding b. shielded metal arc welding c. gas tungsten arc welding d. oxyacetylene gas welding

Q: 10. The presence of wounds in the skin can result in much higher current flow if electrical contact is made where the skin is broken.a. trueb. false

Q: 74. The principal hazard of fluorine compounds is acute, not chronic, exposure.a. trueb. false

Q: 75. The principal hazard of fluorine compounds is chronic, not acute, exposure.a. trueb. false

Q: 76. Which of the following agents is most known for causing abnormalities in the victms bones? a. lead b. mercury c. beryllium d. cadmium e. fluorine

Q: 77. One of the reasons for the success of the popular shielded metal arc welding process (SMAW) is that it is not subject to the hazards of fluorine compounds.a. trueb. false

Q: 78. Which metal fume is cited in the text as being responsible for "metal fume fever?"

Q: 79. Which of the following is sometimes called "Monday morning sickness?" a. metal fumes fever b. cyanosis c. lead poisoning d. beryllium poisoning

Q: 80. "Monday morning sickness" is most associated with exposure to which of the following fumes. a. lead b. zinc c. mercury d. beryllium

Q: 81. The phenomenon of "flashback" in context of occupational safety and health pertains to: a. flammable liquids b. industrial truck charging areas c. Class I, Division 1 atmospheres d. torches

Q: 82. One of the worst workplace disasters in world history involved a fire and explosion from sparks generated by a welder's torch ina. a Union Carbide chemical plant in Indiab. a missile silo in Arkansasc. a nuclear plant in Chernobyl, Russiad. a cooling tower under construction at Three-Mile Island, Virginia

Q: 83. Explain the difference between the terms "operators" and "operations" as these terms are used in connection with eye protection for welding. Why is this distinction significant?

Q: 84. Why do welders' helpers and other personnelsometimes need more training in the use of eye protection than the welders themselves?

Q: 85. The darker the shade the more eye protection for the welder.a. trueb. false

Q: 70. According to Sax, exposure to NOx in which of the following ranges results in the air hunger, cyanosis, loss of consciousness, and final death? a. 25 to 50 ppm b. 60 to 150 ppm c. 200 to 500 ppm d. 1 to 2 per cent

Q: 87. Explain the tradeoff or drawback that prevents selection of a higher protective shade for the protection of welders' eyes.

Q: 71. What is the primary route of entry of lead and mercury fumes into the body?

Q: 88. Arc welding requires darker shade numbers for welding eye protection than does gas welding.a. trueb. false

Q: 72. Which of the welding fumes cited in the text as being responsible for a fatality in a single acute exposure?

Q: 89. Which of the following types of welding requires the darkest shade numbers for eye protection? a. flux-cored arc welding b. thermit welding c. oxyacetylene gas welding d. submerged arc welding

Q: 73. Which of the following is an alloy that makes the metal very dangerous to weld? a. copper b. steel c. aluminum d. beryllium

Q: 58 The process of protecting metal with a coating of primarily zinc is called galvanizing.a. Trueb. False

Q: 59. The process of metal coating of primarily cadmium is called galvanizing.a. trueb. false

Q: 60. Stainless steel is one of the most dangerous materials to weld because of its high cadmium content.a. trueb. false

Q: 61. Stainless steel is one of the most dangerous materials to weld because of its high chromium content.a. trueb. false

Q: 62. For which plating metal have chronic exposures been associated with emphysema and kidney impairment?

Q: 47. A typical acetylene cylinder contains liquid because a. the acetylene is under a pressure of 2000 psi b. water is needed to displace the used acetylene c. an acetone/acetylene solution is more stable than free acetylene d. none of the above; acetylene cylinders do not contain liquid

Q: 63. The energy of the welding arc can cause decomposition of chlorinated hydrocarbon solvents to produce what dangerous gas?

Q: 48. Which of the following substances is emphasized as a hazard in the OSHA welding standard? a. silica b. manganese c. magnesium d. zinc

Q: 64. Phosgene is generated from the decomposition of a. chlorinated hydrocarbons b. trichloroethylene c. solvents d. all of the above e. none of the above

Q: 49. Which of the following lung irritants is emphasized in the OSHA welding standard? a. ozone b. phosgene c. phosphine d. nitrogen oxides

Q: 65. Which of the following is not an agent for decomposition into dangerous phosgene gas? a. chlorinated hydrocarbons b. trichloroethlene c. solvent d. carbon monoxide

Q: 50. Which of the following common asphyxiants in the welding process is a chemical asphyxiant? a. argon b. carbon dioxide c. carbon monoxide d. helium

Q: 66. Nitrogen is so stable that it is not subject to oxidation.a. trueb. false

Q: 51. Which of the following agents is a cause of nonfibrotic pneumoniosis? a. asbestos b. beryllium c. copper d. silica

Q: 67. In the intense heat of welding, even nitrogen can be oxidized.a. trueb. false

Q: 52. Select the most dangerous of the following potential exposures in the welding environment. a. cadmium b. carbon c. aluminium d. tin

Q: 68. In the intense heat of welding, even argon can be oxidized.a. trueb. false

Q: 53. Which of the following agents in the welding environment is considered the least dangerous? a. lead b. mercury c. tin d. zinc

Q: 69. In the intense heat of welding, even helium can be oxidized.a. trueb. false

Q: 54. Carbon dioxide in the welding environment is considered to be in which of the following categories? a. lung irritant b. asphyxiant c. poison d. pneumoconiosis

Q: 55. Airborne asbestos is the best described as a a. lung irritant b. poison c. chemical asphyxiant d. particulate resulting in fibrotic pneumoconiosis

Q: 56. Name at least three air contaminants in the welding environment that are specifically addressed in the welding standards.

Q: 57. Explain why stainless steel is one of the most dangerous materials to weld.

Q: 42. Acetylene is generated from which combination of ingredients? a. calcium carbide and acetone b. acetone and MAPP gas c. helium and acetone d. calcium carbide and water

Q: 27. A principal disadvantage of resistance welding operations is that theya. are limited to sheet metal applicationsb. require higher temperatures than conventional weldingc. require an inerting agentd. require personal protective equipment