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Industrial Wiring 2: Electrical Motor Controls for Integrated Systems, Chapter 11 Tech Check: Transformers
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Terms in this set (16)
Transformers are used to increase generated _____ to a high level for transmission across the country and then decrease it to a low level for use by electrical loads.
voltage
The _____ winding is the coil of a transformer that draws power from the source.
primary
If the turns ratio is 2:1, the transformer is a ______ transformer.
step-down
Because iron is not a fair conductor of electricity, the varying magnetic field that induces a voltage in the secondary of a transformer also induces small voltages in the iron core of the transformer. These small voltages produce ______.
eddy currents
___-phase connections are found in commercial and industrial applications.
three
Low voltage transformer windings are marked with an ______.
X
A service _____ is an electrical service in which service-entrance conductors are run underground from the utility system to the service point.
lateral
A ______ is a connection brought out of a winding at a point between its endpoints to allow the voltage or current ratio to be changed.
tap
VAC power is used to supply devices in a residence that require a large amount of operating power, such as an air conditioner, water heater, clothes dryer, and cooking range
240
To obtain a control voltage of 120 VAC from a line voltage of 480 VAC, the two primary coils must be connected in _____
series
A transformer that is selected for an application must have a higher ____ rating than necessary for the application.
volt/amperage
The most important guideline when sizing a transformer is to select a transformer that safely and efficiently provides the maximum ______ that can be drawn by a load.
current
When selecting a transformer, if a machine does not have devices with high inrush characteristics, inrush current is not as much of a consideration. In this case, the ____ current is more important.
steady-state
One method that can be sued to determine whether a transformer has failed is to measure the input and output ____.
voltages
A DMM set to measure ____ can be used to check for open circuits in the coils, short circuits between the primary and secondary coils, or coils shorted to the core without power supplied to the transformer.
resistance
The power limit of a transformer is listed on the nameplate of the transformer as its _____ rating.
kilovolt-ampere
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Verified questions
ENGINEERING
Using the tables for water, determine the specified property data at the indicated states. In each case, locate the state on sketches of the $p-\upsilon$ and $T-\upsilon$ diagrams. (a) At $p=2 \: \mathrm{MPa}, T=300^{\circ} \mathrm{C}$. Find $u$, in kJ/kg. (b) At $p=2.5 \: \mathrm{MPa}, T=200^{\circ} \mathrm{C}$. Find $u$, in kJ/kg. (c) At $T=170^{\circ} \mathrm{F}, x=50 \% .$ Find $u,$ in Btu/lb. (d) At $p=100 \: lbf/in.^{2}, T=300^{\circ} \mathrm{F}$ . Find $h,$ in Btu/lb. (e) At $p=1.5 \: \mathrm{MPa}, v=0.2095 \: \mathrm{m}^{3} / \mathrm{kg} .$ Find $h,$ in $\mathrm{kJ} / \mathrm{kg}$
ENGINEERING
What is the enthalpy departure?
ENGINEERING
The Hoover Dam backs up the Colorado River and creates Lake Mead, which is approximately 115 miles long and has a surface area of approximately 225 square miles. If during flood conditions the Colorado River flows into the lake at a rate of 45,000 cfs and the outflow from the dam is 8000 cfs, how many feet per 24-hour day will the lake level rise?
ENGINEERING
Bus bars proposed for use in a power transmission station have a rectangular cross section of height H=600 mm and width W=200 mm. The electrical resistivity, $\rho_{e}(\mu \Omega \cdot \mathrm{m})$, of the bar material is a function of temperature, $\rho_{e}=\rho_{e, o}\left[1+\alpha\left(T-T_{o}\right)\right]$, where $\rho_{e, o}=0.0828 \mu \Omega \cdot \mathrm{m}, T_{o}=25^{\circ} \mathrm{C}$, and $\alpha=0.0040 \mathrm{K}^{-1}$. The emissivity of the bar’s painted surface is 0.8, and the temperature of the surroundings is $30^{\circ} \mathrm{C}$. The convection coefficient between the bar and the ambient air at $30^{\circ} \mathrm{C}$ is $10 \mathrm{W} / \mathrm{m}^{2} \cdot \mathrm{K}$. (a) Assuming the bar has a uniform temperature T, calculate the steady-state temperature when a current of 60,000 A passes through the bar. (b) Compute and plot the steady-state temperature of the bar as a function of the convection coefficient for $10 \leq h \leq 100 \mathrm{W} / \mathrm{m}^{2} \cdot \mathrm{K}$. What minimum convection coefficient is required to maintain a safe-operating temperature below $120^{\circ} \mathrm{C}$? Will increasing the emissivity significantly affect this result?
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