D2 - LT #1 Electronic Layout Equipment

Question 1

Which instrument uses a magnifying glass to read the angle measurement?

Answer 1

Open-Faced Transit

Question 2

A transit or theodolite can be used for?

Answer 2

Levelling and laying out angles horizontally and vertically

Question 3

How are the angle readings viewed when using an electronic theodolite?

Answer 3

on an LCD in degrees, minutes & seconds.

Question 4

How large are the graduations on the horizontal circle for a level transit?

Answer 4

Horizontal circle is graduated in 1 degree divions.

Question 5

How many minutes are in one degree?

Answer 5

60 minutes

Question 6

When an instrument does not have an “optical plum met”, what can be used in its place?

Answer 6

Plumb bob

Question 7

The horizontal circle eyepiece is used to:

Answer 7

Take angular readings

Question 8

Which type of instrument may incorporate the use of a micro-dial knob?

Answer 8

A theodolite

Question 9

Vertical angles on an electronic theodolite may be read as:

Answer 9

DMS or % of slope

BONUS: Horizontal ALWAYS DMS

Question 10

When setting up an electronic theodolite on stable ground, it’s important to ensure that:

Answer 10

The compensator is turned on.

Question 11

How many seconds are in a circle?

Answer 11

1 296 000

Question 12

What is the smallest increment of angular measure that can be read on transit with a vernier?

Answer 12

20 seconds

Question 13

How many divisions would be on one side of a 30-minute vernier that can be read to 30 seconds?

Answer 13

60 divisions

Question 14

What type of transit uses a horizontal circle eyepiece?

Answer 14

A closed face transit & theodolite

Question 15

Is a magnetic compass used when laying out a building?

Answer 15

No

Question 16

Which clamp is tightened to make the horizontal circle fixed to the ground?

Answer 16

Lower clamp

Question 17

What is the term used to define the keys on the keyboard of an electronic theodolite that have more than one fuction?

Answer 17

Soft keys

Question 18

When using an electronic theodolite, what is used to plumb the instrument over a point on the ground?

Answer 18

Laser plummet

Question 19

What is the term used to define the keys on the keyboard of an electronic theodolite that have more than one function?

Answer 19

Soft keys

Question 20

What is the term used to describe the angle formed between true north and magnetic north?

Answer 20

magnetic declination

Question 21

Describe the level transit

Answer 21

1) Full horizontal circle & partial vertical circle
2) Uses a vernier scale that allows them to be read to the nearest 10 minutes of arc.
3) The vertical circle allows readings to angle of about 45 degrees

Question 22

Describe the transit

Answer 22

1) full horizontal and vertical circles
2) equipped with an accurate vernier accurate to one minute of an arc or less

Question 23

Describe the theodolite

Answer 23

1) full horizontal and vertical circle
2) scale to measure angles uses a micro-adjustment allowing reading up to one second of an arc

Question 24

Describe electronic theodolite

Answer 24

1) No scales
2) Readings displayed on LCD, software is set by software
3) Angle readings of fractions of a second can be displayed but 5 seconds is the average

Question 25

Open-faced transit is called open faces transit why?

Answer 25

The horizontal and vertical circles are visible from the outside of the instrument.

Question 26

What is the difference between open-face transit and closed-face transit?

Answer 26

the vernier and horizontal circles are enclosed within the body of the instrument.

Question 27

What does the eyepiece on a closed-face transit do?

Answer 27

View the angle measurements:, and eliminates the need for a magnifying glass.

BONUS: Eyepiece on the horizontal and vertical circle readers and the telescope focused by turning the eyepiece

Question 28

What does a soft key (on a theodolite) refer to?

Answer 28

A key with multiple functions

Question 29

What does a transit use for setting the vertical axis over a known point?

Answer 29

Plumb bob or an optical plummt

Question 30

What does a theodolite use for setting the vertical axis over a known point?

Answer 30

An optical plummet or a laser plummet

Question 31

What does an electronic theodolite use for setting the vertical axis over a known point?

Answer 31

Optical plummet or laser plummet

Question 32

What is the allowance of accuracy on an EDM?

Answer 32

1-3 mm is allowed for each 1000 m measured.

EX over 7000, 21 mm margin of error is permitted