7-28. What  voltage  is  needed  to  operate the  single-phase  motor  at  the  motor pool? 1. 110 V 2. 220 V 3.   330  V 4. 440 V 7-29. When  the  voltage  remains  constant, what happens to amperage when (a) resistance is decreased or (b) power consumption is decreased? 1. (a) It (b) it 2. (a) It (b) it 3. (a) It (b) it 4.   (a) It (b) it increases decreases decreases decreases increases increases decreases increases 7-30. Which of the following reasons is NOT an advantage of installing electrical  distribution  systems underground,    rather  than  overhead? 1. Underground installation costs are less 2. Underground  lines  are  secure against  high  winds 3. Underground  lines  are  less susceptible  to  enemy  attack 4. Underground installation provides open land areas free from  distribution  systems 7-31. Electrical  power  is  brought  into  a building  through  what  device  or conductor? 1. Panel  board 2. Switchboard 3. Service  drop 4.  Service  entrance 7-32. What  electrical  device automatically  opens  a  circuit  when the  amperage  exceeds  the  rated value for that device? 1. Panel  box 2. Circuit  breaker 3. Switch 4. Disconnect 7-33. Compared to a No. 4 AWG conductor, the size of a No. 16 AWG conductor is 1. smaller 2. equal 3. larger 7-34. 7-35. 7-36. 7-37. 7-38. 7-39. 7-40. What size wire is used  for  interior most frequently wiring? 1. 2. 3. 4. In is 1. 2. 3. 4. No. 16 AWG No. 12 AWG No. 8 AWG No. 6 AWG which  of  the  following  locations ROMEX  NOT  authorized  for  use? Embedded  in  concrete In garages In  an  explosives  storage building All of the above Which of the following types of insulation  should  be  used  for installation  in  wet  locations? 1.  RH 2. RHW 3.  RUH 4. Each of the above Which,    if any, of the following types of insulation is considered to be suitable for use in dry locations? 1. RHW 2.  T 3.  TW 4. None of the above Instead  of  manually  making  a  sharp bend in rigid aluminum conduit, which  of  the  following  fittings should you use? 1. Coupling 2. Conduit  union 3. Condulet 4. Galvanized steel elbow Which of the following types of conduit can be 1. 2. 3. 4. For the you 1. 2. 3. 4. Rigid PVC EMT Greenfield installing threaded? a switch, which of following  outlet  boxes  should use? 4-inch  octagon  box Gem box Handy  box 4-inch  square  box 46