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Surveying > LESSON 6: ANGLES AND DIRECTIONS MEASUREMENTS > Flashcards

LESSON 6: ANGLES AND DIRECTIONS MEASUREMENTS Flashcards

1
Q

The direction of a line is described by horizontal angle that it makes with reference line or direction.

A

Meridian

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2
Q

This is done by referring to a fixed line of reference called?

A

Meridian

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3
Q

Four Types of Meridian

A

True Meridian
Magnetic Meridian
Grid Meridian
Assumed Meridian

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4
Q

also known as the astronomic meridian or geographic meridian.

A

True Meridian

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5
Q

the direction of a line passing through the astronomic north and south poles and the observer’s position.

A

True Meridian

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6
Q

the direction taken by the magnetized needle of a compass at the observer’s position.

A

Magnetic Meridian

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7
Q

A type of meridian wherein It is not parallel to the astronomic meridians since they converge at a magnetic pole which is located some distance away from the true geographic poles.

A

Magnetic Meridian

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8
Q

It is a fixed line of reference parallel to the central meridian of a system of plane rectangular coordinates.

A

Grid Meridian

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9
Q

is an arbitrary chosen fixed line of reference which is taken for convenience.

A

Assumed Meridian

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10
Q

this meridian is usually the direction from a survey station to an adjoining stations or some well defined and permanent point.

A

Assumed Meridian

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11
Q

According to expedient methods of establishing meridians

Establishing magnetic meridians by _________.

A

Compass

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12
Q

According to expedient methods of establishing meridians

Determining true north by the aid of the _______ and a _________.

A

Sun | plumb line

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13
Q

According to expedient methods of establishing meridians

Determining true north by the ______ and _______of the sun.

A

Rising | Setting

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14
Q

According to expedient methods of establishing meridians

Determining true north by _______.

A

Polaris

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15
Q

According to expedient methods of establishing meridians

Determining _______ by southern cross.

A

True South

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16
Q

Determining _____________ by a wrist watch.

A

True North or South

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17
Q

Defined as the horizontal angle the line makes with an established line of reference.

A

Direction of Lines

18
Q

Kinds of Angles used in Surveying

A

Interior Angles
Deflections Angles
Angles to the right
Bearings
Azimuths

19
Q

Measured to the right clockwise from the preceding line.

A

Angle to the Right

20
Q

Bearing is either from ________ or __________ either _________ or____________as per convenience.

A

north or south | clockwise or anticlockwise

21
Q

The value of bearing __________

A

exceed 90-deg

22
Q

denoted as N ΦΕ or SOW

A

Bearing

23
Q

The system of measuring this bearing is known as RB System or ___________?

A

Reduced Bearing System

24
Q

Whole circle bearing

A

Azimuth

25
Q

Azimuth is always _______either from the __________.

A

clockwise |north or south end

26
Q

The value of azimuth varies from?

A

0º-360°

27
Q

The system of measuring this bearing is known as WCB System?

A

Whole Circle Bearing System

28
Q

A hand-held instrument for determining the horizontal direction of a line with reference to magnetic meridian.

A

Compass

29
Q

the ___________of the instrument has a horizontal circle which is graduated from 0-90° in each quadrant. (5-10 minutes reading)

A

Compass box

30
Q

usually is fixed along the index mark on the north graduation of the circle.

A

Line of Sight

31
Q

the ____________ is of magnetized tampered steel balanced at its center on a jeweled pivot so that it swings freely in the horizontal position.

A

Compass Needle

32
Q

7 types of Compass

A

BRUNTON COMPASS
LENSATIC COMPASS
SURVEYOR’S COMPASS
PLAIN POCKET COMPASS
PRISMATIC COMPASS
FORESTER’S COMPASS
TRANSIT COMPASS

33
Q

A type of compass that is specialized instrument used widely by those meeting to make accurate deeper & angle measurements in the field (geologist archeologists, environmental engineers & surveyors.

A

BRUNTON COMPASS

34
Q

is the typical military field compass, and is principally to measure or layout magnetic bearings.

A

LENSATIC COMPASS

35
Q

also known as CICUMFERENTOR is an instrument used in surveying to measure horizontal angles.

A

SURVEYOR’S COMPASS-

36
Q

similar to the surveyor’s compass, except that it has no sight vanes.

A

PLAIN POCKET COMPASS

37
Q

the graduation can be found on a rotating card instead of being on the compass box

A

PRISMATIC COMPASS

38
Q

is another type of pocket compass, which is usually made of aluminum or some type of metal which does not affect the free movement and positioning of the magnetic needle.

A

FORESTER’S COMPASS

39
Q

the engineer’s transit has a compass box which is similar in construction to the surveyor’s compass.

A

TRANSIT COMPASS

40
Q

Is the horizontal angle and direction by which the needle of a compass deflects from the meridian at any particular locality.

A

MAGNETIC DECLINATION

Surveying (3 decks)

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