# Civil Engineering - Airport Engineering

### Exercise :: Airport Engineering - Section 1

31.

From the end of an instrumental runway, the approach surface rises outwards

 A. 1 in 20 B. 1 in 30 C. 1 in 40 D. 1 in 50

Explanation:

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32.

Speed of

 A. sound at 0°C is 1190 km p.h. B. sound varies 2.4 km p.h. per degree centrigrade rise in temperature C. sound at 0°C is called one Mach D. an aircraft flying at 2975 km p.h., is called 2.5 Mach E. All the above.

Explanation:

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33.

Pick up the correct statement from the following:

 A. The centre line of the approach area coincides with that of the runway B. Approach areas are measured in horizontal surfaces C. The imaginary inclined plane which is directly above the approach area is called approach surface D. Obstruction clearance surface and approach surface are same E. All the above.

Explanation:

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34.

The coordinates of the ends of a runway are (5000, 5000) and (8000, 7000). The co-ordinates of an other runway are (4600, 5100) and (7000, 5300). The co-ordinates of the A.R.P. are

 A. (6500, 6000) B. (5800, 5200) C. (61500, 5600) D. (8000, 7000)

Explanation:

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35.

A gradient of + 0.08% is followed by a gradient of - 0.07%. If the permissible rate of change of grade is 0.003 per 30 metres, the length of the transition curve, is

 A. 150 m B. 140 m C. 160 m D. 175 m