Civil Engineering - Advanced Surveying

Exercise :: Advanced Surveying - Section 3

16. 

Pick up the correct statement from the following :

A. The plane passing through the perspective centre of a stereo pair and a ground point, is known as basal plane
B. Each pair of image points on stereo pair have their own basal plane
C. Relative orienation means reconstructing the basal plane
D. Relative orientation of the model is achieved only when five points within the model are cleared of Y-parallax
E. All the above.

Answer: Option E

Explanation:

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17. 

If α is the observed altitude, the refraction correction in seconds, is

A. 58" cot α
B. 58" tan α
C. 58 sin α
D. 58 cos α.

Answer: Option A

Explanation:

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18. 

The value of geo-centric parallax to be added to the observed altitude of sun is

A. 9" cos α
B. 9" sin α
C. 9" tan α
D. 9" cot α.

Answer: Option A

Explanation:

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19. 

With standard meridian as 82° 30' E the standard time at longitude 90° E is 8 h 30 m. The local mean time at the place will be

A. 7 h 00 m
B. 7 h 30 m
C. 8 h 00 m
D. 8 h 30 m
E. 9 h 00 m.

Answer: Option E

Explanation:

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20. 

A star is said to elongate

A. when the star momentarily moves vertically
B. when the angle at the star of the spherical triangle is 90°
C. when the star's declination is greater than the observer's latitude
D. all the above.

Answer: Option D

Explanation:

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