Engineering :: Surveying

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51.

A tie line in a chain surveying

A.	checks the accuracy of the framework	B.	enables the surveyor to locate the interior details which are far away from the main chain lines
C.	fixes up the directions of all other lines	D.	all of the above

52.

When the position of a point is to be located accurately by a perpendicular offset, the direction of perpendicular is set out by means of

A.	theodolite	B.	optical square
C.	dumpy level	D.	planimeter

53.

When the position of a point is to be fixed most accurately, it should be located by oblique offsets.

True

False

54.

The accuracy in laying down the perpendicular offsets and in measuring them depends upon

A.	scale of plotting	B.	length of offset
C.	importance of the object	D.	all of these

55.

When the length of offset is 20 m, it is called

short

long

56.

The mimiting length of the offset is

A.	5 m	B.	10 m
C.	15 m	D.	20 m

57.

The instrument used for setting out an offset at a right angle, is called

A.	open cross-staff	B.	french cross-staff
C.	adjustable cross-staff	D.	optical square

58.

In a field book, the booking is commenced at the bottom of a page and worked upwards.

True

False

59.

The adjustable cross-staff is used for setting out an offset

A.	at an angle of 45?	B.	at an angle of 60?
C.	at a right angle	D.	at any angle

60.

For setting out an offset at an angle of 45?,

A.	open	B.	french
C.	adjustable