The required diameter of the bearing for fitting the shaft, considering oversize and lubrication clearance, is determined to be approximately 0.07742 inches based on the given specifications and calculations.
An inside diameter of bearing = 1/14 inches. Oversize for armature shaft = 0.008 inches. Clearance for lubrication = 0.002 inches. Let the required diameter of the bearing be d inches.
To fit the shaft, the diameter of the bearing should be d - 0.002 inches. (clearance for lubrication). The given oversize of the bearing for the armature shaft is 0.008 inches. So, we have:d - 0.008 = 1/14 - 0.002.
Multiplying throughout by 14, we get: 14d - 0.112 = 1 - 0.02814d = 1 - 0.028 + 0.112d = 1.084/14d = 0.07742 inches. Thus, the diameter of the bearing should be 0.07742 inches.
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Under which of the following conditions will an overcurrent
condition develop in the inverter section of an AC drive?
A. The inertia of the load is excessively small.
B. Overvoltage occurs at the inverter's output terminals.
C. The incoming line voltage falls below a certain level.
D. A component inside the inverter section shorts.
The condition under which an overcurrent condition will develop in the inverter section of an AC drive is option D: A component inside the inverter section shorts.
An AC drive, also known as a variable frequency drive (VFD), consists of multiple components, including the inverter section responsible for converting DC power to AC power. In the event of a component failure or malfunction within the inverter section, such as a short circuit, an overcurrent condition can occur.
When a component inside the inverter section shorts, it creates a low-resistance path for the flow of electrical current. This can lead to an excessive current flowing through the affected component, exceeding its rated capacity. As a result, an overcurrent condition develops, which can cause damage to the inverter section and potentially other components in the AC drive system.
The other options mentioned are not directly associated with the development of an overcurrent condition in the inverter section:
A. The inertia of the load being excessively small refers to the load connected to the AC drive. While this condition may affect the dynamic behavior of the system, it does not directly result in an overcurrent condition in the inverter section.
B. Overvoltage occurring at the inverter's output terminals refers to a voltage condition at the output side of the inverter. While overvoltage can be problematic for the connected load, it does not directly cause an overcurrent condition in the inverter section.
C. The incoming line voltage falling below a certain level refers to a voltage condition on the input side of the AC drive. Although low voltage can affect the performance of the AC drive, it does not directly lead to an overcurrent condition in the inverter section.
In summary, among the given options, an overcurrent condition in the inverter section of an AC drive is most likely to occur when a component inside the inverter section shorts, as stated in option D.
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what architectural style is the cathedral of santiago de compostela
The Cathedral of Santiago de Compostela is a stunning example of Romanesque and Baroque architectural styles. The cathedral was initially built in the 11th century in the Romanesque style, which is characterized by round arches, barrel vaults, and sturdy columns. This style was prevalent in Europe during the 11th and 12th centuries.
In the 17th and 18th centuries, the cathedral underwent extensive renovations, which added Baroque elements to the structure. Baroque architecture is known for its elaborate ornamentation, dramatic lighting, and intricate designs. The Baroque elements added to the cathedral include the main façade, which features intricate carvings and statues of Saint James and other Christian figures.
The Cathedral of Santiago de Compostela is a significant pilgrimage site for Christians around the world. Its unique blend of Romanesque and Baroque styles makes it a must-see for architecture enthusiasts and travelers alike.
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