LCGC Chromatography Solutions Interview Questions and Answers

The base point to start the layout work for a survey instrument is a fixed reference point on the ground.

• The base point should be easily identifiable and stable.

• It should be located near the area to be surveyed.

• Common base points include existing structures, permanent markers, or survey monuments.

• The base point is used as a starting point to establish the coordinate system for the survey.

• Measurements and angles are then taken from the base point to determine the positions of ...read more

The percentage of fly ash used in cement varies depending on the specific application and regulations.

• The percentage of fly ash in cement can range from 10% to 50%.

• In some cases, fly ash can replace a portion of the cement content entirely.

• The amount of fly ash used in cement is often determined by local regulations and environmental considerations.

• Fly ash is a byproduct of coal combustion and is commonly used as a supplementary cementitious material.

The survey instrument works by using advanced technology to measure and record precise data points for land surveying purposes.

• The survey instrument uses various sensors and measurement techniques to accurately determine distances, angles, and elevations.

• It typically includes a theodolite or total station for measuring angles and distances, and a leveling instrument for determining elevations.

• The instrument may also have GPS capabilities for precise positioning and georeferen...read more

The accuracy of a total station depends on various factors.

• The accuracy of a total station is typically expressed in terms of angular and distance measurements.

• The angular accuracy is usually specified in seconds or minutes of arc.

• The distance accuracy is typically given in millimeters or inches.

• The accuracy of a total station can vary depending on the make and model, as well as environmental conditions.

• For example, a high-end total station may have an angular accuracy of 1 s...read more

The accuracy of an auto level depends on its specifications and quality.

• The accuracy of an auto level is typically expressed as a value in millimeters per kilometer (mm/km).

• Higher quality auto levels generally have higher accuracy.

• The accuracy can vary depending on factors such as the instrument's calibration, atmospheric conditions, and the skill of the operator.

• For example, a high-quality auto level may have an accuracy of ±1.5 mm/km, while a lower-quality one may have an a...read more

The ratio of M25 concrete is 1:1:2.

• The ratio of M25 concrete is 1 part cement, 1 part sand, and 2 parts aggregate.

• This ratio is commonly used in construction for medium-strength concrete.

• For example, if you have 1 kg of cement, you would need 1 kg of sand and 2 kg of aggregate to make M25 concrete.

The coordinate refers to a set of numerical values that represent the position of a point in a given space.

• Coordinates are used in various fields such as geography, cartography, and surveying.

• They typically consist of two or three values representing the position along different axes.

• For example, in a two-dimensional Cartesian coordinate system, a coordinate could be (x, y), where x represents the horizontal position and y represents the vertical position.

• In surveying, coordi...read more