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Chapter Title

Question

1

Capacity Factor/Unit Load Calculations 1/Demand Factor/Dielectric

mandy note: go to https://en.wikipedia.org/wiki/Dielectric_spectroscopy for next questions

2

Distribution Feeder Regulation/Delta/Delta wye Transformers/Voltage Drop/Voltage Divider/Voltage Regulation/Current Divider

One case of voltage regulation is in a transformer. The unideal components of the transformer cause a change in voltage when current flows. Under no load, when no current flows through the secondary coils, V_{nl} is given by the ideal model, where V_{S} = V_{P}*N_{S}/N_{P}. Looking at the equivalent circuit and neglecting the shunt components, as is a reasonable approximation, one can refer all resistance and reactance to the secondary side and clearly see that the secondary voltage at no load will indeed be given by the ideal model. When the transformer delivers full load, a voltage drop occurs over the winding resistance, causing the terminal voltage across the load to be lower than anticipated. This leads to a ___________ voltage regulation which must be considered in use of the transformer.

3

Theory

Incidence matrix: The ${displaystyle n_{t} imes n_{f}}$ matrix ${displaystyle mathbf {A_{a}} }$ is called nodeto________ incidence matrix for the matrix elements ${displaystyle a_{ij}}$ being  ${displaystyle a_{ij}={egin{cases}1,&{ ext{if flow }}j{ ext{ leaves node }}i1,&{ ext{if flow }}j{ ext{ enters node }}i,&{ ext{if flow }}j{ ext{ is not incident with node }}iend{cases}}}$
A reference or datum node ${displaystyle P_{0}}$ is introduced to represent the environment and connected to all dynamic nodes and terminals. The ${displaystyle (n_{t}1) imes n_{f}}$ matrix ${displaystyle mathbf {A} }$ , where the row that contains the elements ${displaystyle a_{0j}}$ of the reference node ${displaystyle P_{0}}$ is eliminated, is called reduced incidence matrix. The conservation laws (KCL) in vectormatrix form:  ${displaystyle mathbf {A} mathbf {F} =mathbf {0} }$
The uniqueness condition for the potentials (KVL) in vectormatrix form:  ${displaystyle mathbf {W} =mathbf {A^{T}} mathbf {w} }$
where ${displaystyle w_{k}}$ are the absolute potentials at the nodes to the reference node ${displaystyle P_{0}}$ . Proof: Using KVL:  ${displaystyle {egin{aligned}mathbf {W^{T}} mathbf {F} =mathbf {(A^{T}w)^{T}} mathbf {F} =mathbf {(w^{T}A)} mathbf {F} =mathbf {w^{T}AF} =mathbf {0} end{aligned}}}$
because ${displaystyle mathbf {AF} =mathbf {0} }$ by KCL. So:  ${displaystyle sum _{k=1}^{b}W_{k}F_{k}=mathbf {W^{T}} mathbf {F} =0}$

4

Conductor Sizing/Protection Calculations/AC Power Plugs/Sockets

A blade connector is a type of single wire connection using a flat conductive blade which is inserted into a blade receptacle. Usually both blade connector and blade receptacle have wires attached to them either through of the wire to the blade or ______________ of the blade to the wire. In some cases the blade is an integral manufactured part of a component (such as a switch or a speaker unit), and a blade receptacle is pushed onto the blade to form a connection.

5

MILSTD1553/ACCC Conductor/Motors/Transformers/Circuit Breaker/Brushed DC Electric Motor/Short Circuit

MILSTD1553B does not specify the length of the bus. However, the maximum length of bus is directly related to the gauge of the cable conductor and time delay of the transmitted signal. A smaller conductor attenuates the signal more than a larger conductor. Typical propagation delay for a 1553B cable is 1.6 _____________ per foot. Thus, the endtoend 100foot bus (30 m) would have a 160 nanosecond propagation delay, which is equal to the average rise time of a 1553B signal. According to MILHDBK1553A, when a signal's propagation delay time is more than 50% of the rise or fall time, it is necessary to consider transmission line effects. This delay time is proportional to the distance propagated.

6

Junction Boxes/Raceways/Conduit Bodies/Reclosers/Multiway Switching/Camlock

If the PVC coating is UL listed as the primary corrosion protection, does that mean the conduit complies with NEMA RN1?

7

AC/DC/Capacitance/Inductor/SWER 1

Inductors in a parallel configuration each have the same potential difference (voltage). To find their total equivalent inductance (L_{eq}):


${displaystyle {frac {1}{L_{mathrm {eq} }}}={frac {1}{L_{1}}}+{frac {1}{L_{2}}}+cdots +{frac {1}{L_{n}}}}$$$
The current through inductors in series stays the same, but the voltage across each inductor can be different. The sum of the potential differences (voltage) is equal to the total voltage. To find their total inductance:


${displaystyle L_{mathrm {eq} }=L_{1}+L_{2}+cdots +L_{n},!}$$$
These simple relationships hold true only when there is no mutual coupling of magnetic fields between individual inductors.

8

Ground/Earthing System/ThreePhase

An ungrounded electrical box, appliance, power tool, or extension cord could become a danger if there is no path to ground, except through you. Without a ground wire, your body may complete the ground path and you may be shocked or electrocuted. In older homes with cloth wrapped wire or in homes with knob and ____________ wiring, this is the case. Newer appliances and some tools come equipped with a threepronged cord, incorporating a ground for protection.

9

HV Circuit Breaker Testing/Unit Load Calculations 2/Service Load Calculations/Optional Methods/SWER 2/Motor Constant

Where should you mount your transducer?
You should look for an easily attachable place where your transducer will move in conjunction with the interrupter(s). You should also try to mount the transducer to a solid piece of metal that won’t vibrate during operation of the circuit breaker. The closer you are to the interrupter without mechanical linkages in between, the more accurate your travel ___________ will become. Once a transducer mounting spot is established, you should continue to test it at this spot for accurate trending purposes.

10

Inductance/Impedance/Connectors

A wellknown crossover cable is the Ethernet crossover cable, which converts between T568A and T568B termination. What matters specifically is not "which contact corresponds to which wire", but rather "which contact on one connector corresponds to which contact on the other connector": to illustrate the distinction, T568A straight through cables and T568B straight through cables are electrically identical: pin 1 on one end corresponds to pin 1 on the other end, though in the T568A it is a green/white striped wire that connects them, while in T568B it is an ___________/white striped wire that connects them. However, a cable wired with T568A at one end and T568B at the other is a crossover cable.

11

OSHA Safety/Dig Alert/Training/Asbestos/Code of Federal Regulations/Title 29, Part 1926

Within 8 hours after the death of any employee or report of the inpatient hospitalization of ______ or more employees, as the result of a workrelated incident, you must report this to the closest OSHA office.

12

Employees/Contractors/Insurance/Safety

What is required to be worn by employees and contractors at all times to minimize forces transmitted to the head, neck, spine, from falling objects?

13

Basic Bid Preparation/Estimating/Blueprint Reading

The notice to owner contained in a contract, informs the customer of _________________.
