This set of Basic Civil Engineering Questions and Answers for Entrance exams focuses on “Equipments Used in Levelling”.
1. How many chief types of levels are used in levelling?
Explanation: There are 4 chief types of levels used. They are Dumpy level, Wye Level, Reversible level and Tilting level.
2. A levelling staff is used to establish:
a) Horizontal line of sight
b) Vertical line of sight
c) Location of points
d) Distance of points
Explanation: A levelling staff is straight rectangular rod, with graduations, zero starting from foot of staff. It is placed at the required point and horizontal line of sight from a level is made.
3. Dumpy level was originally designed by:
Explanation: Gravatt designed the Dumpy level; which consists of a telescope secured in two collars fixed by adjusting screws.
4. How many categories of levelling staff are there?
Explanation: There are 2 categories – self reading staff and target staff. Self-reading staff can be directly read from the instrument through telescope. Target staff consists of moving target against which reading is to be taken.
5. Which of the below is used to make line of sight horizontally in a level?
a) Foot screws
b) Levelling head
d) Tangent screws
Explanation: There is a tube and bubble is enclosed in it. Using 3 foot screws, the bubble is centralised. Once it is stable, the level is said to have maintained a horizontal line of sight.
6. A digital level reads a:
a) Target staff
b) Barcoded staff
c) Digital staff
d) Telescopic staff
Explanation: Digital level is an electronic level. It is set up on a tripod and it reads a barcoded staff. All the details are fed into the memory of level and can be retrieved on a computer.
7. Which of the below cannot be used to measure vertical heights?
a) Self level
b) Aneroid barometer
Explanation: Vertical measurement can be approximately taken using barometer and hypsometer. These determine pressure difference at 2 elevations and results can be concluded from these.
8. How many types of self-reading staff are available?
Explanation: There are 3 types of self-reading staff. They are solid, folding and telescopic staff.
9. Which of the below is not common in all levelling equipments?
b) Level vials
c) Level rods
d) Tilting screws
Explanation: Tilting screw is found only in the tilting level. Using this, one can tilt the telescope to the required angle, keeping the vertical axis.
10. Level vials can be of ____________ types.
Explanation: Level vials contain a bubble, which is to be centralised to obtain horizontal line of sight. It may be of bulls-eye type (circular shaped) or vial type (tube shaped).
11. Abney level is a type of hand level.
Explanation: Hand level is a hand held instrument. Abney level is one of these. It includes a clinometer to measure vertical angles.
12. For accurate levelling __________ is attached inside telescope in an automatic level.
c) Cross hairs
d) Double lens
Explanation: Compensator is also called stabilizer. It consists of 2 fixed prisms and it creates an optical path between eye piece and objective. It results in exact positioning of line of sight due to gravity.
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