CA Electrical PrepC-10 · by MITRYXA
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Free C-10 Practice Questions: Planning & Estimating

60 free questions with answers, explanations and the source for each. Answer one to see why. No sign-up.

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  1. 1 / 60

    Under 440.35, the conductors supplying multimotor and combination-load air-conditioning equipment are sized from the nameplate value called:

  2. 2 / 60

    A single box contains three 14/2 NM cables (each with 2 insulated conductors and a bare ground), no internal cable clamps, and one single-pole switch. Using the 14 AWG allowance, what minimum box volume is required?

  3. 3 / 60

    [1,500 sq ft dwelling, 12 kW range, 5 kW dryer] At 3 VA per square foot, the general lighting load (before demand) is:

  4. 4 / 60

    A two-gang box is installed with a barrier dividing it into two spaces. For box fill, each space within the box is:

  5. 5 / 60

    The general lighting demand factors of 220.45 reduce the feeder and service load. When an electrician is determining the number of branch circuits for general illumination, those demand factors:

  6. 6 / 60

    In the optional calculation of 220.82, a clothes dryer that is not connected to the laundry branch circuit is included in the general loads at:

  7. 7 / 60

    When determining the floor area for each floor in a load calculation, 220.5 requires that floor area to be calculated from the:

  8. 8 / 60

    Under 314.28(B), in a pull box having any dimension over 6 ft, all conductors shall be:

  9. 9 / 60

    When calculating box fill under 314.16(B), small fittings such as locknuts and bushings are counted as:

  10. 10 / 60

    Under the 25-foot feeder tap rule, the tap conductors must have an ampacity of not less than:

  11. 11 / 60

    [Scenario A] Applying the Table 220.45 dwelling demand factors (first 3,000 VA at 100 percent, the remainder at 35 percent) to that 10,500 VA general load gives:

  12. 12 / 60

    Under 625.42, electric vehicle charging loads are considered ___ loads:

  13. 13 / 60

    Under Table 220.45, for hotels and motels (including apartment houses without provision for cooking by tenants), the first 20,000 or less volt-amperes of general lighting load is taken at a demand factor of:

  14. 14 / 60

    Chapter 9, Table 8 lists a 14 AWG conductor at 4110 circular mils. Using VD = 2 × K × I × D ÷ CM with K = 12.9, a 14 AWG copper circuit carrying 12 A over a one-way length of 60 ft has a voltage drop of about:

  15. 15 / 60

    At 3 VA per sq ft, a 600 sq ft area's general lighting load is:

  16. 16 / 60

    Where two loads (like electric heat and A/C) will not be used at the same time, the service calculation:

  17. 17 / 60

    A 120 V branch circuit has a 5.06 V voltage drop. That is about what percent, and how does it compare with the 3 percent in the 210.19 informational note?

  18. 18 / 60

    The disconnecting means for an AC condensing unit must be:

  19. 19 / 60

    One of the conditions that must be met to use the optional multifamily calculation of 220.84 is that each dwelling unit must be equipped with:

  20. 20 / 60

    [Scenario C: a one-story one-family dwelling measuring 30 ft × 60 ft on its outside dimensions] Under 220.5(C), the floor area used for the lighting load is:

  21. 21 / 60

    Under 220.84, which of these is one of the conditions that must be met to use the multifamily optional calculation for each dwelling unit?

  22. 22 / 60

    Under 220.82(C), electric space heating with four or more separately controlled units is taken at:

  23. 23 / 60

    Under the exception in 220.87, the existing maximum demand may be based on readings continuously recorded over a minimum period of:

  24. 24 / 60

    Under 230.71(B), when a single service has more than one service disconnect, the disconnects are permitted to consist of:

  25. 25 / 60

    Continuous loads are counted at what percentage when sizing the service/feeder and its overcurrent device:

  26. 26 / 60

    In box-fill calculations, each device yoke or strap is counted as how many volume allowances?

  27. 27 / 60

    Material for a job is priced at 3,000 dollars. Sales tax is 7.25 percent and freight is 150 dollars. Using total = material + (material × tax rate ÷ 100) + freight, the material cost carried into the estimate is:

  28. 28 / 60

    A storage warehouse has a general lighting load of 40,000 VA. Using Table 220.45 (first 12,500 VA or less at 100 percent, remainder over 12,500 VA at 50 percent), the demand load is:

  29. 29 / 60

    In the optional dwelling-unit calculation of 220.82(B)(1), general lighting and general-use receptacles are figured at how many volt-amperes per square foot?

  30. 30 / 60

    Under 310.10(C), which of these conductor types is listed by type for use in wet locations?

  31. 31 / 60

    One condition for using the next higher standard overcurrent device rule of 240.4(B) is that the conductors being protected are:

  32. 32 / 60

    Applying the Table 220.45 dwelling demand factors (first 3,000 VA at 100 percent, remainder at 35 percent) to the 9,000 VA combined general load gives:

  33. 33 / 60

    A restaurant has 6 units of thermostatically controlled commercial kitchen equipment totaling 40,000 VA; the two largest are 9,000 VA and 7,000 VA. Using Table 220.56 (6 and over at 65 percent), the feeder demand load for this equipment is:

  34. 34 / 60

    Under 408.4(A)(6), a panelboard circuit directory that uses abbreviations and symbols must be:

  35. 35 / 60

    Under 358.30(A), EMT shall be securely fastened within what distance of each outlet box, junction box, device box, cabinet, conduit body, or other tubing termination?

  36. 36 / 60

    A 10-unit multifamily building has a total connected load of 300,000 VA. Applying the Table 220.84 demand factor for 10 units (43%), the calculated service load is:

  37. 37 / 60

    A raceway has a total internal area of 0.304 square inches. Using Chapter 9, Table 1 (over 2 conductors: 40 percent of the cross-sectional area), the permitted fill area for three or more conductors is:

  38. 38 / 60

    Under 220.83(B) (existing dwelling where new air conditioning or electric space heating IS being installed), the air-conditioning and space-heating loads are included at:

  39. 39 / 60

    A job needs 240 ft of conduit sold in 10-ft sticks. The minimum number of sticks to buy is:

  40. 40 / 60

    In the optional calculation of 220.82, permanently connected motors that are not already included with the listed appliances are added at:

  41. 41 / 60

    In the existing-dwelling calculation of 220.83, the two small-appliance circuits plus the laundry circuit contribute a combined general load of:

  42. 42 / 60

    Under 440.22(C), where the manufacturer's values marked on the equipment are less than the ratings otherwise selected, the protective device rating:

  43. 43 / 60

    For conductors not included in Chapter 9, such as optical fiber cables, the conduit-fill calculation uses:

  44. 44 / 60

    A feeder diagram under 215.5 shows the demand factors used and the size and type of conductors. It also shows:

  45. 45 / 60

    A contractor's yearly overhead (office rental, supplies and wages, advertising, bad debts, and storage charges) is 90,000 dollars, and yearly direct job costs are 600,000 dollars. Using overhead rate = overhead ÷ direct job costs × 100, the overhead rate to add to each bid is:

  46. 46 / 60

    A bid is material 3,000 dollars + labor 2,500 dollars + overhead at 10 percent of (material + labor) + 800 dollars profit. The bid is:

  47. 47 / 60

    For a cable with an elliptical cross section, the conduit-fill cross-sectional area calculation is based on:

  48. 48 / 60

    A room is 20 ft by 30 ft. Its area is:

  49. 49 / 60

    [Scenario B: 2,500 sq ft one-family dwelling] The general load is (2,500 × 3) + two small-appliance circuits + laundry = 12,000 VA. After the Table 220.45 demand factors (first 3,000 VA at 100 percent, remainder at 35 percent), the demanded general load is:

  50. 50 / 60

    A pull box has a straight pull of 4 AWG conductors, and the largest raceway is trade size 2. Using 314.28(A)(1) (length not less than 8 × the trade size of the largest raceway), the box length shall be not less than:

  51. 51 / 60

    Adding a 10% waste factor to 1,000 ft of wire, you order:

  52. 52 / 60

    For a single-phase dwelling service, 230.90 permits the service overload protection to be based on:

  53. 53 / 60

    A contractor buys material for $800 and applies a 25% markup. The selling price is:

  54. 54 / 60

    Total bid = material + labor + overhead + profit. If material = 2,000 dollars, labor = 1,800 dollars, overhead = 600 dollars, and profit = 500 dollars, the bid is:

  55. 55 / 60

    A receptacle is installed where the largest conductor connected to its yoke is 10 AWG. The volume allowance that must be added for that device yoke is:

  56. 56 / 60

    Under 210.19, branch-circuit conductors supplying a household range must have an ampacity not less than the rating of the branch circuit and not less than:

  57. 57 / 60

    In addition to the ratings in Table 240.6(A), 240.6 lists additional standard ampere ratings for fuses of:

  58. 58 / 60

    The informational note to 210.19 says branch-circuit conductors sized to prevent a voltage drop exceeding ___ at the farthest outlet provide reasonable efficiency of operation:

  59. 59 / 60

    A panel directory labels a circuit "Jake's bedroom." Under 408.4(A)(5), a circuit description shall be:

  60. 60 / 60

    In the critical path method of scheduling, a delay in one of the tasks on the key path results in:

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