Other Industrial Engineering & Manufacturing Subjects
Surveying
What is accretion?
Explanation:
Accretion refers to the natural process where soil or sediment is deposited along a shoreline, causing land to gradually expand over time. This phenomenon occurs through the action of water currents, waves, or tides that transport materials and settle them in new locations. As these deposits build up, they effectively extend the boundary of the land into the water body. This geological mechanism is distinct from sudden events or biological theories, focusing purely on physical accumulation. It is a fundamental concept in geography and coastal science that explains how coastlines evolve slowly. Therefore, the definition of gradual accumulation by natural causes accurately describes this specific process.
The intercept of a staff
Explanation:
When a leveling staff is held perfectly vertical and normal to the line of sight, the observed intercept represents the true vertical distance without any geometric distortion. Tilting the staff away from this perpendicular position causes the line of sight to intersect a longer segment of the staff, artificially increasing the reading. Therefore, the minimum possible intercept is achieved exclusively when the staff is held truly normal, ensuring the highest accuracy in elevation measurements.
An imaginary line joining the points of equal elevation on the surface of the earth, represents
Explanation:
A contour line is defined as an imaginary curve on a map that connects all points sharing the exact same elevation above a reference datum, such as sea level. This concept allows cartographers to represent the three-dimensional shape of the terrain on a two-dimensional surface by grouping points of equal height together. When you traverse along a single contour line, your altitude remains constant, making it the standard method for visualizing hills, valleys, and slopes. Therefore, any line joining points of equal elevation on the earth's surface is fundamentally a contour line.
In chain surveying field work is limited to
Explanation:
Chain surveying is a fundamental technique that relies exclusively on measuring horizontal distances between points to create a network of triangles. Unlike other surveying methods, it deliberately avoids angular measurements during the field work phase to maintain speed and simplicity. The entire process focuses on establishing a framework of lines where all data collected is strictly linear, making linear measurements the sole requirement for this specific type of survey.
One of the tacheometric constants is additive, the other constant, is
Explanation:
In tacheometric surveying, the distance measurement formula relies on two specific constants derived from the instrument's geometry. The additive constant accounts for the physical length of the telescope and the offset of the optical axis, while the other fundamental parameter is known as the multiplying constant. This multiplying constant represents the ratio of the focal length of the objective lens to the distance between the optical center and the horizontal crosshair, directly scaling the staff intercept to determine the horizontal distance.
In levelling operation
Explanation:
In levelling operations, maintaining a continuous line of sight is essential for accurate elevation calculations. When the staff is carried forward to a new point, the instrument must remain stationary to ensure the backsight and foresight readings are taken from the same horizontal plane without introducing vertical errors. Conversely, shifting the instrument changes the observation point, so the staff must stay put to preserve the reference height being measured. This strict protocol prevents cumulative mistakes and guarantees that the calculated differences in elevation between points remain valid throughout the surveying process.
Two concave lenses of 60 cm focal length are cemented on either side of a convex lens of 15 cm focal length. The focal length of the combination is
Explanation:
When lenses are cemented together, their powers add algebraically, where power is the reciprocal of focal length. The convex lens provides positive power while the two concave lenses provide negative power, resulting in a net positive power for the combination. By summing the individual powers ($P = P_{convex} + 2 \times P_{concave}$) and taking the reciprocal of the total, we find the equivalent focal length is 30 cm. This demonstrates how combining diverging lenses with a converging one reduces the overall converging ability of the system.
The angle between two plane mirrors of optical square, is
Explanation:
An optical square is a surveying instrument designed to establish a precise 90-degree angle between two lines. This is achieved by arranging two plane mirrors at a specific inclination such that a light ray reflected from the first mirror strikes the second and is reflected again at a right angle to its original path. The geometric principle of double reflection dictates that the deviation of the ray is twice the angle between the mirrors. To produce a total deviation of 90 degrees, the mirrors must be set at an angle of 45 degrees relative to each other, making this the correct configuration for the instrument.
What is accuracy?
Explanation:
Accuracy specifically measures how close a measured value is to the actual or true value of the quantity being observed. It reflects the correctness of a measurement by quantifying the deviation from the standard, ensuring the result is not systematically biased. High accuracy means the measurement error is minimal, making it the definitive indicator of truthfulness in data. This concept is fundamental in science and engineering to validate whether an instrument or method yields results that align with reality. Therefore, it is defined by the extent of deviation from the true value rather than consistency or agreement between repeated trials.
In quadrantal bearing system, back bearing of a line may be obtained from its forward bearing, by
Explanation:
In the quadrantal bearing system, bearings are measured from either North or South towards East or West, always remaining within 90°. To find the back bearing, one simply reverses the direction of the line by swapping the cardinal points, such as changing North to South and East to West. This substitution automatically adjusts the angle to represent the opposite direction without needing to add or subtract 180°, which is a procedure specific to the whole circle bearing system. Therefore, the correct method relies entirely on interchanging the reference points to maintain the correct quadrant relationship.
The radius of curvature of the arc of the bubble tube is generally kept
Explanation:
The bubble tube in a leveling instrument relies on a curved glass tube containing liquid and an air bubble. To ensure high sensitivity and accuracy, the tube is bent into an arc with a large radius of curvature, typically around 100 meters. This large radius creates a gentle slope for the bubble, meaning a small tilt in the instrument results in a measurable movement of the bubble. Consequently, this design allows surveyors to detect minute changes in the horizontal line of sight, making 100 meters the standard and correct value for optimal performance.
An ideal vertical curve to join two gradients, is
Explanation:
A parabolic vertical curve is the ideal choice because it provides a constant rate of change in grade, ensuring a smooth transition between two different slopes. This constant acceleration of the vehicle's vertical motion results in a uniform distribution of sight distance and comfortable riding conditions for drivers. Unlike other shapes, the parabolic curve allows for precise calculation of key points like the vertex and tangent points using simple algebraic equations. Consequently, it is the standard geometric form adopted in highway and railway engineering design to meet safety and comfort criteria.
What is Actual Possession?
Explanation:
Actual possession is defined by the tangible, physical control an individual exercises over a specific piece of property. Unlike constructive possession, which relies on legal rights without physical presence, actual possession requires the owner to be in direct contact with or occupying the item. This physical occupation establishes immediate dominion and control, serving as the primary evidence that a person is currently holding the property. Consequently, the definition hinges entirely on the reality of physical occupation rather than future intentions, past ownership history, or abstract legal recognition alone.
The main principle of surveying is to work
Explanation:
The fundamental principle of surveying dictates working from the whole to the part to minimize the accumulation of measurement errors. By first establishing a precise, large-scale framework, any small mistakes made during detailed measurements of smaller sections will not significantly affect the overall accuracy of the project. This hierarchical approach ensures that local errors do not propagate and distort the larger control network, maintaining the integrity of the entire survey. Consequently, this method provides a robust foundation for all subsequent detailed mapping and construction work.
What is the meaning of "adjoining"?
Explanation:
The term "adjoining" specifically describes a physical connection where two distinct properties meet at a shared boundary line. This means the lands are not merely near each other or in the same area, but are directly touching along a common edge. Consequently, this shared border creates a direct spatial relationship that distinguishes adjoining land from simply adjacent or nearby parcels. The definition focuses on this tangible contact point rather than general proximity or shared legal interests. Therefore, the option describing a common border accurately captures the precise meaning of the word.
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