# Surveying Questions and Answers – Traversing by Fast Needle Method

This set of Surveying Interview Questions and Answers for Experienced people focuses on “Traversing by Fast Needle Method”.

1. In which method the magnetic bearings of traverse lines are measured by a theodolite fitted with a compass?
a) Free needle method
b) Fast needle method
c) Loose needle method
d) Direct method

Explanation: In fast needle method, the magnetic bearings of traverse lines are measured by a theodolite fitted with a compass. The direction of magnetic meridian is not established at each station.

2. In traversing by fast needle method, there are three methods of observing the bearings of lines by fast needle method.
a) True
b) False

Explanation: There are three methods of observing the bearings of lines by fast needle method. They are direct method with transiting, direct method without transiting, back bearing method.

3. Which of the following method is not among the methods of observing the bearings of lines by fast needle method?
a) direct method with transiting
b) direct method without transiting
c) back bearing
d) front bearing

Explanation: There are three methods of observing the bearings of lines by fast needle method. They are a direct method with transiting, direct method without transiting, back bearing method.

4. In which methods of observing the bearings of lines by fast needle method, the telescope will be normal at one station and inverted at the next station?
a) direct method with transiting
b) direct method without transiting
c) back bearing
d) front bearing

Explanation: In direct method with transiting, the telescope will be normal at one station and inverted at the next station. The method is, therefore, suitable only if the instrument is an adjustment.

5. The application of 180° correction is required in which of the following methods?
a) direct method with transiting
b) direct method without transiting
c) back bearing
d) front bearing

Explanation: The application of 180° correction is required in a direct method without transiting. It is always convenient to read one vernier throughout and apply the correction at alternate stations.
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6. Which of the following methods is the most satisfactory method for the bearings of lines by fast needle method?
a) direct method with transiting
b) direct method without transiting
c) back bearing
d) front bearing

Explanation: In back bearing method the complete process should be repeated at other stations. In direct method with transiting, the telescope will be normal at one station and inverted at next station. The method is, therefore, suitable only if the instrument is an adjustment. Therefore, direct method without transiting is most satisfactory among these three methods.

7. Fast needle method is more accurate than the free needle method.
a) True
b) False

Explanation: The direction of the magnetic meridian is not established at each station. But instead, the magnetic bearings of the lines are measured with reference so the direction of magnetic meridian established at first station.

8. Chain and compass traversing is also called a fast needle method.
a) True
b) False

Explanation: Chain and compass traversing is not so called a fast needle method. Loose or free needle method is also called as chain and compass traversing.

9. Telescope is used in direct method with transiting during observing the bearings of lines by fast needle method.
a) True
b) False

Explanation: Theodolite is the instrument used in direct method with transiting for observing the bearings of lines by fast needle method. In theodolite, using lower clamp and tangent screw we can point the telescope to magnetic meridian.

10. In direct method with transiting, it is convenient to read one vernier throughout and apply the correction at alternate stations.
a) True
b) False

Explanation: In direct method without transiting, Instead of applying correction at every station, opposite vernier may be ready alternatively. However, it is convenient to read one vernier throughout and apply the correction at alternate stations.

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