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How many types of EDM instruments are there based on wavelength?

This question was previously asked in
HPCL Engineer (Civil) 04 Nov 2022 Official Paper
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  1. 3
  2. 5
  3. 1
  4. 4

Answer (Detailed Solution Below)

Option 1 : 3
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Detailed Solution

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Explanation:

Electronic Distance Measurement (EDM):

This is a modem development in surveying where electromagnetic waves are utilized to measure distance. Depending on the wavelength, EDM instruments can be classified as:

  1. Microwave instruments.
  2. Visible light instruments.
  3. Infrared instruments.

Hence option (1) is correct.

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