Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
The process of the turning the telescope in the vertical plane through 180┬░ about the trunnion axis is called ______
Transiting
Plunging
Reversing
All of the above
All of the above
The process of rotating a theodolite telescope 180┬░ in the vertical plane about its horizontal axis (trunnion axis) is known by multiple terms: Transiting, Plunging, or Reversing. This action results in the telescope pointing in the opposite direction while the inverted image becomes erect (depending on the internal optical system).
The process of rotating a theodolite telescope 180┬░ in the vertical plane about its horizontal axis (trunnion axis) is known by multiple terms: Transiting, Plunging, or Reversing. This action results in the telescope pointing in the opposite direction while the inverted image becomes erect (depending on the internal optical system).
FaceLeft+FaceRight=360┬░ тАФ Relationship between telescope faces for a correctly adjusted theodolite
The trunnion axis serves as the pivot point for vertical rotation. By releasing the vertical clamp and rotating the telescope, the objective end is brought to the eyepiece side. This movement is essential for observing 'face left' and 'face right' positions to eliminate instrumental errors like line-of-sight collimation error.
Transiting is also called 'plunging' the telescope.
The process is crucial for eliminating errors due to the lack of parallelism between the line of sight and the horizontal axis.
It converts 'face left' observation to 'face right' observation and vice-versa.
Eliminates systematic instrumental errors like collimation error.
Improves accuracy in survey measurements by averaging face-left and face-right readings.
Increases observation time.
Repeated operation can cause mechanical wear if not handled carefully.
Measuring horizontal angles with high precision.
Determining the bearing of survey lines.
Extension of survey lines.
Transiting, plunging, and reversing are synonymous in the context of theodolite operation.
When the telescope is moved in the horizontal plane about the vertical axis, it is called 'swinging'.
D is correct тАФ All the terms listed (Transiting, Plunging, and Reversing) are standard engineering synonyms for the process of rotating the telescope 180┬░ vertically.
Always remember that in surveying, 'swinging' refers to horizontal rotation, while 'plunging' or 'transiting' refers to vertical rotation.