020301hA Survey Equipment - Part A Flashcards
The distance between the stadia lines can be multiplied by a factor of ____ to estimate the horizontal distance from the instrument.
1:100
The suspended prism (compensator) on an automatic level compensates for up to ____ out-of-level.
12 degrees
Rotter laser levels are accurate to +/- ___ in 30 m.
+- 3 mm (1/8th)
The power of the light emitted from a visible light laser level is limited to prevent eye injuries, but warning signs must be posted. T or F
T
A receiver unit that is very sensitive to the light beam can extend the effective range of the level from __ to ___ times
3 to 6
Infrared laser levels do produce a visible red dot on beam. T or F
F. They do not produce s visible red dot or beam; therefore, they always require a sensor at the rod location.
Rotary lasers are self levelling. T or F
T. Up to 6 degrees off level.
Can rotary lasers produce a vertical plane?
Yes. Many rotary lasers can be turned 90 degrees to produce a vertical, plumb line.
What can be used when it is difficult to see a laser beam emitted from a rotary laser level?
A sensor. Also known as a receiver or target.
Why must warning lights on construction equipment be turned off when using a receiver for a rotary level.
Receivers could pick up the flashing light.
Are rotary lasers commonly used in excavation and grading?
Yes. a sensor is often attached to a part of the excavation equipment so the operator knows when the proper elevation has been reached.
What is a fixed beam laser level?
Fixed beam laser levels have a single beam and do not turn unless put on a rotating platform.
How can a fixed beam laser form 90 degree beams to each other?
With prisms.
Transits and theodolites are primarily used to measure and lay out horizontal and vertical angle. T or F
T
What are some benefits to theodolites over transits?
Better optics and newer technologies, they are more accurate for angle measurement.
