This set of Surveying Multiple Choice Questions & Answers (MCQs) focuses on “Photogrammetric Surveying – Aerial Camera”.
1. Both Terrestrial and aerial cameras are having the same functionality.
Explanation: The functionality of the terrestrial and aerial camera is the same i.e., capturing pictures. In case of aerial photogrammetry, aerial camera is mounted on top of moving aeroplane. It must satisfy the required inputs, which it must possess.
2. Which of the following doesn’t include in the lens?
Explanation: The lens which is used in aerial photogrammetry is having a certain combination. It consist of lens, diaphragm, shutter and the filter. Each one has its prominence in the process of aerial photogrammetry.
3. While using a large lens, which type of shutter is adopted?
a) Between-the –lens shutter
b) Louvre shutter
c) Focal plane shutter
d) Ideal shutter
Explanation: Shutter is the most important component which will capture the photographs. The number of photographs captured will depend on the shutter speed. These are of 3 types of which for the large lens, Louvre lens are adopted for high speed.
4. Which among the following specifies the use of diaphragm?
a) Adjusting focal plane
b) Managing azimuth
c) Adjusting horizon
d) Managing size of aperture
Explanation: Diaphragm is placed in the aerial camera in order to increase or decrease the size of the aperture. By doing this the light rays entering the camera can be controlled and the shutter speed can be controlled. If the diaphragm opening is larger, shutter speed will be high.
5. Which of the following is not an essential part of the aerial camera?
Explanation: In general, an aerial camera consists of a lens, shutter, focal plane, magazine, drive mechanism. These are having their priorities of their own based on the time of usage. Shutter will play a prominent role while capturing the photographs.
6. Which among the following is placed in between lens elements?
c) Line of sight
Explanation: A diaphragm is placed between the lens elements. It can act as an opening of the lens. By rotating it can actually zoom the object which is been sighted and also decrease the size.
7. Filter consists of ________
a) piece of aperture
b) piece of hole
c) piece of glass
d) piece of lens
Explanation: Filter can be described as the piece of glass which can be placed in front of the lens. Due to the condition of the atmosphere, different filters can be adopted so that the readings can be taken exactly but not approximately.
8. Focal plane is provided at_____________
a) Point of resection
b) Point of intersection
c) Point of contraction
d) Point of collimation
Explanation: The provision of a focal plane is done at the point of collimation. These collimation marks are provided at the upper surface of the cone surface. It is suggested to place near nodal point.
9. Which of the following doesn’t come under drive mechanism?
a) Tripping the shutter
b) Operating vacuum system
c) Winding the film
d) Binding the film
Explanation: A drive mechanism is involved in the camera body and is used for tripping the shutter, operating vacuum system and winding the film. This can be done by manual operation or automatic operation.
10. Which of the following can hold the films of the focal plane?
Explanation: Magazine involves in holding the films and houses the film flattening device at the focal plane. It plays a major role in the drive mechanism, which can help in moving parts of the system.
Sanfoundry Global Education & Learning Series – Surveying.
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