CM 2105

What is a builder’s level used for?

To turn angles and tilt the scope for sighting.

What type of leveling instrument is the dumpy level considered?

The instrument of choice.

What is the hand level also known as?

A sight level.

What does an automatic level create?

A horizontal line of sight.

How is the height of instrument calculated?

By adding the backsight to the known elevation.

What are vertical angles measured from?

Horizon that is parallel to the earth surface and zenith that is perpendicular to the horizon.

How are horizontal angles measured?

In horizontal planes.

What are deflection angles?

Horizontal angles measured from a prolongation of a preceding line.

What are interior angles used for?

Determining the angles of a closed geometric figure.

What is the sum of interior and exterior angles?

360 degrees.

How many prisms are part of an optical angle reading system?

2-4 prisms.

What should be included in a field book?

Title page, table of contents, legend of symbols, north arrow, identification number, date, time, weather, and sketches.

What units are on an English level rod?

Feet, tenths, hundredths.

What units are on a metric level rod?

Meters, centimeters, millimeters.

What does it mean to close the loop in surveying?

Ending the level loop at the benchmark where you began or at another benchmark.

What is a backsight?

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

What is a foresight?

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

What is the purpose of a turning point in leveling?

To temporarily transfer the elevation from the height of instrument.

What is the definition of elevation?

The vertical distance above a zero datum.

What happens to steel in cold weather?

Steel contracts (shrinks).

What happens to steel in hot weather?

Steel expands (stretches).

What is the ideal condition for chain or tape measuring?

Flat ground.

What is the effect of bumpy or uneven ground on tape measurement?

Tape may sag or bend, leading to an overestimation of the actual distance.

What is the potential issue when measuring on sloped ground?

The measured distance is longer than the actual horizontal distance.

What is a steel tape?

A flexible measuring tool made of thin hardened steel or stainless steel.

What is a steel chain?

Made of thick steel links used for rough measurements in field surveying.

What is the sum of 33d 22’ 22”, 22d 33’ 33”, 44d 55’ 55”, and 55d 44’ 44”?

156d 36’ 34.”

What does a decimal rod's top part indicate in 100ths marked?

Even.

How should markings be placed when marking a line or grade on-site?

Plumb, level, straight.

What is the calculated discrepancy ratio when line A-B measures 100.05 ft and B-A measures 99.95 ft?

1/1000.

What is a deflection angle in field angles?

Measured off a prolongation of a baseline.

What is considered a legal document on a construction site?

Engineers field book.

What are the two angles defined by Line 1-2 at 95 degrees and Line 2-3 at 158 degrees?

243d & 117.

Convert the bearing S22d 21' 19" E to azimuth.

157d 38’ 41”.

Who is qualified for the location of property lines?

Registered Land Surveyor.

What instruments are classified as angle-measuring instruments?

Total stations, transits, theodolites.

What term describes the process of locating a point on-site with an angle?

Angle layout.

What is the name of a field angle used with a total station?

Direct angle.

Is it true that reverse means the vertical circle is on the left?

False.

What procedures are involved in turning angles?

Direct, reverse, closing the horizon, transverse angles, and layout.

Which part of a total station aligns with the vertical axis?

Optical plummet.

What is an angle turned off an extended line called?

Deflection angle.

What angle method is used to eliminate systematic equipment error in measurements?

Direct and reverse.

What has been the workhorse of leveling instruments for over a century?

Dumpy level.

How is the height of the instrument determined?

By adding the backsight to the known elevation.

What consists of a hollow tube with a spirit level to determine a horizontal line?

Hand or sight level.

What does a construction surveyor do to determine the HI after a foresight reading?

Adds the foresight reading to the known elevation.

How do surveyors close the level loop?

By ending a level line at a benchmark.

What positioning technique is used for a rod man holding a level rod?

Rock the rod back and forth slightly.

What instrument can be used to turn angles and tilt the scope for sighting?

Builder’s level.

Is the statement 'elevation is the vertical distance above a zero datum' true?

True.