ELECTRICITY FOR TRADES (LL W/ACCESS)
3rd Edition
ISBN: 9781260699487
Author: Petruzella
Publisher: MCG CUSTOM
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Chapter 1.2, Problem 11RQ
To determine
Mention the safety way to open a disconnect switch using a lockout–tagout procedure.
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Chapter 1 Solutions
ELECTRICITY FOR TRADES (LL W/ACCESS)
Ch. 1.1 - Does the severity of an electric shock increase or...Ch. 1.1 - In general, voltage levels above what value are...Ch. 1.1 - In general, current levels above what value are...Ch. 1.1 - What circuit fault can result in an arc flash?Ch. 1.1 - Define each of the following terms associated with...Ch. 1.1 - Explain why an arc flash is so potentially...Ch. 1.1 - What is a permit-required confined space?Ch. 1.1 - What does the term personal protective equipment...Ch. 1.1 - What personal protective attire is required when...Ch. 1.1 - When should face shields be worn?
Ch. 1.1 - A fall arrest system must be rigged so that...Ch. 1.1 - A ladder is used to reach the top of a building 16...Ch. 1.1 - What are the deck requirements for a scaffold work...Ch. 1.1 - Prob. 14RQCh. 1.1 - List the three ingredients required to sustain a...Ch. 1.1 - Which classes of fire are multipurpose...Ch. 1.1 - List four hazardous properties or characteristics.Ch. 1.2 - Prob. 1RQCh. 1.2 - Compare the terms grounding and bonding.Ch. 1.2 - Why is the earth not considered to be an effective...Ch. 1.2 - Explain what is meant by a ground fault.Ch. 1.2 - How does a ground-fault circuit interrupter (GFCI)...Ch. 1.2 - How does a ground-fault circuit interrupter (GFCI)...Ch. 1.2 - Explain what is meant by an arcing fault.Ch. 1.2 - Compare the amount of current that results from...Ch. 1.2 - Compare what GFCIs and AFCIs protect against.Ch. 1.2 - What does a lockout-tagout procedure refer to?Ch. 1.2 - Prob. 11RQCh. 1.2 - A voltmeter is used to verify that no voltage is...Ch. 1.2 - What is the main goal of OSHA?Ch. 1.2 - What is the primary purpose of the rules set forth...Ch. 1.2 - Assume a piece of electrical equipment has been...Ch. 1.2 - How often is the National Electrical Code updated...
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- 1) The parameters for circuit in Figure 1 are ẞ₁ = 120, B2=80, VBE1 (On) = VBE2 (on) = 0.7 V and VA1 = VA2 = ∞0. a) Find the collector current in each transistor. b) Find the small signal voltage gain Av = Vo/Vs. c) Find the I/O resistance. Rib 5V. Figure 1 Q₁ 0.5 k Vcc=9V Q2 R ww 50 Ωarrow_forward3) In the circuit in Figure 3, the Transistor parameters are VTN = 0.8 V and Kn = 0.5 mA/V2. Calculate ID, VGS, and VDS. VDD = 10 V Κ = 32 ΚΩ Κρ=4ΚΩ R2 = 18 ΚΩ Rs = 2k Figure 3arrow_forward2) Consider the circuit in Figure 2, The transistor parameters are VTP = -0.8 V and Kp = 0.5 mA/V2. Determine ID, VSG and VSD.arrow_forward
- For the circuit shown, let V₁ = 12 V, Is1 = 2A, Is2 = 4A, R₁ = 2, R2 = 4, and R3 = 6. Determine the current Io using Mesh method as follows: 1. Choose all meshes that must be included, if any, to construct the supermesh. 11, 13 O 11, 12 O 12, 13, 11 12, 13 O none of the above 2. Consider mesh (loop) iz, write the corresponding expression in terms of mesh currents i₁, 12, 13 as of the form (R11 · i₁ + R₁2 · 2 + R₁3-13 = V₁), then enter the corresponding values: R11 R12 R13 Ω Ω Ω V V₁₂ 3. Solve the above equation to determine then lo : 10 = Ist A R₁ ww ww R₂ + V₁ 1, R3 The relative tolerance for this problem is 7%. ww IS2arrow_forwardEnter the matrix values (numerical) to solve for mesh-currents i₁, iz and 13, for the circuit shown, using Mesh method. In the matrix, row 1, row 2, and row 3 correspond to i₁, 12 and 13, current expressions, respectively. Let Vs=15, R₁ =50, R₂-32, R3-8, R4-17, R5-29, and R=41. [R11 R12 R13 The matrix values are shown here: R21 R22 R23 = V₂ R31 R32 R33 [V3] The relative tolerance for this problem is 5%. R1 Loop i₁ R11 + Vs Ω R12 Ω R13 Ω V V₁= Loop 12 R21 Ω R22 Ω R23 Ω V V₂ Loop 13 Ω R31 R32 Ω R33 Ω V3= V R2 R4 R3 R5 R6arrow_forwardFor circuit shown, use Mesh method to find the voltage Vo as follows. Enter, in the matrix format, as below, the loop currents, where row 1, and row 2, correspond to i₁, and i2 loop current expressions, respectively. Let Vs1-5, Vs2-15, R₁=5, R₂=2, and R3=8. The matrix values are shown here: [R11 R12 21 R21 R22 Rx - M - M iz = The relative tolerance for this problem is 5%. Vst (+- R1 ww Loop i₁ R115 G12 V₁ = Loop 12 R21 R22 V₂= Ω C C Ω V Ω 02 C V R₂ ww VS2 + Ry ww + Vo Use Cramer's rule (matrix), substitution, or any other method to calculate the voltages:arrow_forward
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