Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 9, Problem 15RQ
What two factors determine the turning force of a wattmeter?
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Chapter 9 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 9 - To what is the turning force of a dArsonval meter...Ch. 9 - Prob. 2RQCh. 9 - A DC voltmeter has a resistance of 20,000 per...Ch. 9 - 4. What is the purpose of an ammeter shunt?
Ch. 9 - 5. Name two methods used to make a DC multirange...Ch. 9 - 6. How is an ammeter connected into a circuit?
Ch. 9 - 7. How is a voltmeter connected into a circuit?
Ch. 9 - 8. An ammeter shunt has a voltage drop of 50 mV...Ch. 9 - 9. What type of meter contains its own separate...Ch. 9 - 10. What electrical quantity does the oscilloscope...
Ch. 9 - 11. What is measured on the Y axis of an...Ch. 9 - 12. What is measured on the X axis of an...Ch. 9 - 13. A waveform shown on the display of an...Ch. 9 - 14. What is the major difference between a...Ch. 9 - 15. What two factors determine the turning force...Ch. 9 - You are an electrician on the job. You have been...Ch. 9 - 1. A d'Arsonval meter movement has a full-scale...Ch. 9 - 2. The meter movement described in Question 1 is...Ch. 9 - 3. A meter movement has a full-scale value of . A...Ch. 9 - 4. The meter movement in Question 3 is to be used...Ch. 9 - 5. A digital voltmeter indicates a voltage of 2.5...
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- A three-phase transmission line supplies power to three loads at a voltage 408 Vrms (line to line). The loads are as follows: Load 1: S₁ = 100+ j50 VA Load 2: S₂ = 40-j20 VA Load 3: S3 = 10 + j0 VA Find the magnitude of the line current | Line and the combined power factor of the loads. Hint: Steral \= √3 | Vime |× | Ime | line linearrow_forwardCan you show why the answer to this question R = 199 ohm?arrow_forward2.5. Find the half-power beamwidth (HPBW) and first-null beamwidth (FNBW), in radians and degrees, for the following normalized radiation intensities: (a) U(9) cos θ cos(20) (b) U(θ)-cos2 θ cos2(26) (c) U(θ) = cos(θ) cos(30) (0 < θ < 900,0 < φ 360) (d) U(t) = cos2(9) cos2(39) (e) U(9) = cos(29) cos(39) (f) U (ecos (20) cos (30)arrow_forward
- Don't use ai to answer I will report you answerarrow_forwardDon't use ai to answer I will report you answerarrow_forwardA 60 Hz, 230 kV, 275 km long, uncompensated three-phase transmission line consists of three conductors bundled by phase, such that each conductor in the line is of the ACSR Falcon type. The separation between each bundled conductor is d = 45 cm and the separation between each phase of the line is 2.4 m. Calculate: "The parameters R, L, C of the line in Q2/km; µH/m and nF/m. And the total values of ZL and YC in Q and S, respectively, and in polar coordinates." Generalized constants A, B, C and D of the line, according to the type of transmission line. Present the results in rectangular coordinates. If a three-phase wye load draws 3/4 of the nominal current of the 300 MW system with FP = 0.85 lagging and at 230 kV, calculate: (a) Current at the load in KA (b) Voltage at the source in KV, (c) Current at the source in kA and (d) power at the source in MVA. Obtain the results per phase. Transmission line voltage regulation percentagearrow_forward
- Determine the required EMT size for the following combination of conductors:18. Four 8 AWG Type THW and four 12 AWG Type THW:19. Three 350 kcmil and one 250 kcmil Type XHHW conductors and a 4 AWG bare conductor:20. In a nonmetallic-sheathed (Type NM) cable installation, a 10⁄3 with equipmentgrounding conductor is installed in a metal octagonal box to supply two 12⁄2 withequipment grounding conductor branch-circuit cables. What is the minimum sizebox? The box contains internal cable clampsarrow_forwardFor problems 8 and 9, determine the correct box size for each of the following conditions:8. Two nonmetallic sheathed cables with two 12 AWG conductors, an equipment groundingconductor, and a switch in a metal box without a plaster ring.9. A raceway run serving a series of luminaires, connected to a total of three circuits. Theluminaires are supplied by 120 volts from a 3-phase, 4-wire system. Each box will containtwo circuits running through the box and a third circuit connected to a luminaire, which issupported by a luminaire stud in the box. Use 12 AWG Type THHN conductors.arrow_forward28. The minimum size raceway for the following conductors is: a. Three, 250 kcmil conductors with XHHW insulation b. One, 3⁄0 AWG conductor with XHHW insulation c. One, 4 AWG conductor with XHHW insulation29. The minimum size raceway for the following conductors is: a. Twelve, 6 AWG conductors with THHN insulation b. Nine, 8 AWG conductors with THHN insulation c. Eighteen, 10 AWG conductor with THHN insulation d. One, 10 AWG equipment grounding conductor with THHN insulation30. The minimum size wireway for the following with parallel conductors is: a. Two sets of three, 250 kcmil conductors with XHHW insulation b. Two, 3⁄0 AWG conductors with XHHW insulation c. 1, 4 AWG conductor with XHHW insulation d. The conductors terminate on three power distribution blocks. Each one has adimension of 4 in. wide and 3 in. high:arrow_forward
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