CE 301: Test 1 Questions With
Complete Answers
Pacing - ANSWER Approximate Measurement. Length of pace that can be
comfortably repeated. Important uses: distance between markers, key points in
construction layouts; 1/100 accuracy ratio
Odeometer - ANSWER automobile odometers - Assist in identifying platted
property lines. Measuring wheels - where low order precision is acceptable
(1/100 - 1/200)
EDM - ANSWER Electronic Distance Measurement. Function by sending light
wave along the path to be measured form the instrument station, and then the
instrument measures the phase difference between the transmitted light wave
and the light wave as it is reflected back to its source from a reflecting prism at
the second point.
Woven tapes made of linen, Dacron, and the like - ANSWER fine copper strands
interwoven to provide strength and to limit deformation due to long use and
moisture.
Problems with EDM for short distances - ANSWER 1. the time involved setting up
the EDM and the prism, 2. The unreliable accuracies in some short-distance
situations.
steel tape - ANSWER Valuable tool. Most precise, next to EDM, best for short
distances.
Invar tapes - ANSWER 35% nickel, 65% steel. Alloy has very low coefficient of
thermal expansion.
Plumb Bob - ANSWER used in taping to transfer from tape to ground when the
tape is being held off the ground to maintain its horizontal alignment.
Hand level - ANSWER used to keep the steel tape horizontal when measuring.
, Range poles - ANSWER used in taping and theodolite work to provide alignment
sights.
Clamp handle - ANSWER Grips the tape at any intermediate pint without bending
or distorting the tape.
Tension handles - ANSWER Used in precise work to ensure that the appropriate
tension is being applied.
Chaining pins - ANSWER used to mark intermediate points on the ground. In
route surveying - whole set is used to mark out the centerline. In rear surveying -
responsible for checking the number of whole tape lengths by keeping an
accurate count of the pins collected.
Tape repair kits - ANSWER include: punch plier and repair eyelets, steel punch
block and rivets and tape repair sleeves.
Plumb bob target - ANSWER used to provide alignment sights
Breaking Tape - ANSWER When a slope is too steep to do horizontal tape
measurement, shorter horizontal measurements are taken. The shorter
measurements are totaled to provide the overall dimension. Increases chance of
random errors
Systematic taping errors (4) - ANSWER 1. Slope
2. Erroneous length
3. Temperature
4. Tension and sag
Random Taping Errors (5) - ANSWER 1. Slope
2. Temperature
3. Tension and sag
4. Alignment
5. Marking and plumbing
Normal Tension - ANSWER tension that eliminates sag errors
Most random errors are... - ANSWER Compensating, alignment errors are
cumulative and the result of misalignment is to make the measurement too long.
What are the most significant random taping errors? - ANSWER Marking and
plumbing
Ordinary taping - ANSWER taping at the level of 1/5000 accuracy.
Complete Answers
Pacing - ANSWER Approximate Measurement. Length of pace that can be
comfortably repeated. Important uses: distance between markers, key points in
construction layouts; 1/100 accuracy ratio
Odeometer - ANSWER automobile odometers - Assist in identifying platted
property lines. Measuring wheels - where low order precision is acceptable
(1/100 - 1/200)
EDM - ANSWER Electronic Distance Measurement. Function by sending light
wave along the path to be measured form the instrument station, and then the
instrument measures the phase difference between the transmitted light wave
and the light wave as it is reflected back to its source from a reflecting prism at
the second point.
Woven tapes made of linen, Dacron, and the like - ANSWER fine copper strands
interwoven to provide strength and to limit deformation due to long use and
moisture.
Problems with EDM for short distances - ANSWER 1. the time involved setting up
the EDM and the prism, 2. The unreliable accuracies in some short-distance
situations.
steel tape - ANSWER Valuable tool. Most precise, next to EDM, best for short
distances.
Invar tapes - ANSWER 35% nickel, 65% steel. Alloy has very low coefficient of
thermal expansion.
Plumb Bob - ANSWER used in taping to transfer from tape to ground when the
tape is being held off the ground to maintain its horizontal alignment.
Hand level - ANSWER used to keep the steel tape horizontal when measuring.
, Range poles - ANSWER used in taping and theodolite work to provide alignment
sights.
Clamp handle - ANSWER Grips the tape at any intermediate pint without bending
or distorting the tape.
Tension handles - ANSWER Used in precise work to ensure that the appropriate
tension is being applied.
Chaining pins - ANSWER used to mark intermediate points on the ground. In
route surveying - whole set is used to mark out the centerline. In rear surveying -
responsible for checking the number of whole tape lengths by keeping an
accurate count of the pins collected.
Tape repair kits - ANSWER include: punch plier and repair eyelets, steel punch
block and rivets and tape repair sleeves.
Plumb bob target - ANSWER used to provide alignment sights
Breaking Tape - ANSWER When a slope is too steep to do horizontal tape
measurement, shorter horizontal measurements are taken. The shorter
measurements are totaled to provide the overall dimension. Increases chance of
random errors
Systematic taping errors (4) - ANSWER 1. Slope
2. Erroneous length
3. Temperature
4. Tension and sag
Random Taping Errors (5) - ANSWER 1. Slope
2. Temperature
3. Tension and sag
4. Alignment
5. Marking and plumbing
Normal Tension - ANSWER tension that eliminates sag errors
Most random errors are... - ANSWER Compensating, alignment errors are
cumulative and the result of misalignment is to make the measurement too long.
What are the most significant random taping errors? - ANSWER Marking and
plumbing
Ordinary taping - ANSWER taping at the level of 1/5000 accuracy.
