CM 2105 Midterm LSU

A construction surveyor on his initial instrument setup takes a foresight rod reading of 3.78' to a turning point 1 determining its elevation to be 4.31 ft. The surveyor proceeded to the next instrument setup taking a back-sight rod reading of 5.78 ft. to turning point 1. What is the HI of this second instrument setup?

10.09 ft

A turning point is used in the differential leveling process to _______________ transfer the elevation from the height of the instrument.

temporarily

The ______________ of the instrument is the vertical distance above the benchmarlk.

height

A _________________ is a reading on a rod held on a point whose elevation is unknown.

foresight

For more than a century, the ______________ has been the workhorse of leveling instruments.

dumpy level

A simple tool, the hand level, also called a _______________, is an extremely useful tool in leveling.

sight level

Some people prefer to use the _______________ for leveling because they are comfortable with its operation.

dumpy level

In addition to being able to perform leveling operations, a ______________ can be used to turn angles, and the scopes can be titled for sighting.

A ______________ is a reading on a rod held on a point whose elevation is known.

backsight

the elevation of the turning point is determined by subtracting the ________________ from the height of instrument.

foresight

Convert Bearing N 20d 20' W to Azimuth

339d 40'

When marking a line or grade on a job site which of the following best describes the placement of these markings?

Plumb, level, straight

Convert 5 ft 9 inches to ft/decimal ft

5.75 ft

Field engineers must be aware of many important concepts in the performance of field applications. When performing a series of measurements (angles, elevations, or distances), if all the shots were very close (value), this series of shots could be considered to have a high degree of _________.

precision

The following angles are turned from an occupied point. Which angle from the following list Closes the Horizon?

33d 22' 22"

44d 21' 45"

55d 47' 51"

228d 28' 02"

Which of the following is (are) part of the field book?

All of the above:

Title page

Table of contents

Legend of symbols

Construction surveying requires methods delivering high accuracies. What types of backsights are the best for getting the highest accuracy when turning angles?

long

What part of a transit is used to set up over the center of a control point?

optical plummet

When recording construction surveying data in the field, which of the following is most important?

instrumental serial number

Nodal point 2 has an incoming line from 1 and an outgoing line to 3. Calculate the two angles defined by the following: Line 1-2 has a direction of 95 degrees, and Line 2-3 has a direction of 158 degrees?

243d & 117

This method is used as a simple check to ensure that the angles about a point add up to 365 degrees

closing the horizon

When measuring a(n) ___________ angle with a transit, theodolite, or total station, the angle is from the zero point of the circle to where the horizontal crosshairs intersects the point where the vertical angle is desired.

vertical

Which selection best describes "Closing the Horizon"

angular check

______________ angles are often measured to determine the angles of a closed geometric figure.

interior

Which selection is the best description of benchmark?

Permanent solid point with a known elevation

Surveyors "Close the level loop" by performing which of the following selections?

Ending a level line at a benchmark

Measurement principles are critical to field observations. When performing a series of measurements (angles, elevations, or distances) if all the shots were numerically close this series of shots would have a high degree of precision. What type of error could

generate Precision without accuracy?

systematic

Construction surveying require methods delivering high accuracies. What types of back-sights are the best for getting the highest accuracy when turning angles?

long

From the following data calculate the resulting discrepancy ratio. A forward measurement of 199.95 ft was recorded followed by a reverse measure of 200.05 ft between points A and B.

1/2000

What ethical perspective pertaining to the development of a construction site must a construction surveyor keep in consideration when preparing to work on a specific project?

Site is a natural resource

Measuring distances on construction sites of various elevations require different techniques to collect data. Which improvised methodology describes this field application?

Breaking chain

What type of error does a steel chain have when its nominal length is longer than the actual length?

instrumental

Which of the following selections will satisfy the need for a rod man holding a level rod correctly?

rock the rod back and forth slightly

Which field angle removes systematic errors from measured angles on jobsites?

direct and reverse

Which of the following normally provides most of the survey control information on a jobsite?

wooden stakes

Field engineers and layout personnel perform many data gathering tasks in the Site Development preparation process. Which of the following is qualified to locate proper corners on a job site?

licensed surveyor

When using an optical level, field engineers must focus both the cross hairs and image. Which of the following describes the situation of unfocused crosshairs?

parallax

Bucking the line in a leveling exercise is best described by which selection?

using the same HI everyday

Deflection angle is a field angle best described by which statement

Angles measured off a prolongation of a base line

Cross Section Leveling is a method of differential leveling often used in the construction of which of the following

levees

the survey method of leveling when using a targeted prism or 360d prism is called ___________ with a total station

trigonometric leveling

when you want to locate a point on a jobsite and an angle needs to be turned to locate it, you are performing angle _____________.

layout

if an angle is turned off of this extended line, it is called a(n) ____________ angle.

deflection

___________ Sea level is used as the datum or reference for leveling work

Mean

Transit type instruments can be broken down into three major components: the upper plate assembly or alidade, the lower plate assembly or horizontal circle, the _________ head.

leveling

which of the following best describes the term 229d 22' 23"?

Azimuth

Which of the following is a field angle used when working with a total station?

The ____________ is one of the most inexpensive and versatile instrument used by field engineers.

builders level

Record keeping is an important part of surveying. Which of the following is a legal document on a construction site?

Engineers field book

Deflection angle is a field angle best described by which of the following statements?

Angles measured off a prolongation of a baseline

What are the three measurable values that determine the position of one point to another?

Direction, distance, elevation

What type of leveling does a laser level use to generate a points elevation?

differencial

Reverse is when the vertical circle is on the left as you are sighting through the telescope, and direct when the vertical circle is on your right as you sight through the telescope.

false

Even with advancements in other leveling instruments such as the automatic level and the laser, the ____________ is still the instrument of choice by a number of persons in construction.

dumpy level

the height of instrument is the elevation of the line of sight of the instrument. this is determined by adding the _____________ to the known elevation.

backsight

Many construction companies who don't have both an angle-measuring instrument and a dumpy or automatic level will do all of their leveling work with a ____________?

builders level

When measuring a distance with a steel tape, which of the following four selections has a minimal or no effect on the distance?

flat ground

Measurement angles are critical to jobsite field operations. When performing a series of measurements (angles), which angle method is used to eliminate systemic (equipment error)?

direct and reverse

The level rod in the differential leveling process has 100ths marked on a decimal rod. The top part of the mark is?

even

When blunders (incorrect measures) are made in the various surveying areas (angles, distance, elevation), which of the following is larger in value?

mistakes

A typical theodolite may have as many as ___________ prisms or lenses as part of the optical reading system

20

When it is desired to determine the value of an angle between two lines, the angle is

measured

Which part of a total station lines up directly with the vertical axis?

T or F..In the process of turning angles, procedures such as direct, reverse, closing the horizon, traverse angles, and layout are performed.

True

A typical optical theodolite may have as many as ______ prisms or lenses as part of the optical angle-reading system.

20

__________ Sea Level is used as the datum or reference for leveling work.

mean

A simple tool, the hand level, also called a __________, is an extremely useful tool in leveling.

sight level

Some people prefer to use the __________ for leveling because they are comfortable with its operation.

transit

The ______ angle measurement occurs on the angle-measuring circle which is independent of the vertical sighting.

horizontal