An aircraft is flying with Mach 2.0. Calculate recovery temperature if ambient temperature is 305K. Assume recovery factor is 0.85.

512.4K

400�C

253.2K

100�C

Correct Answer : 512.4K

Explanation : Given, Mach number = 2.0, ambient temperature T1 = 305K
Assuming the recover factor as 0.85 and for such case,
Recovery temperature T2 = T1*(1+0.17*M²)
T2 = 305*(1+0.17*2*2) = 305*1.68 = 512.4K.

Recently Updated in Aircraft Design Questions

What is the goal of preventive maintenance?

Increase equipment failure

To reduce breakdowns of critical equipment

To increase breakdowns of critical equipment

Not to provide maintenance at a given period of time

Correct Answer : Option (B) : To reduce breakdowns of critical equipment

Explanation : Maintenance can be divided into different types. Preventive is one of the type of maintenance. It is done with the goal of reducing critical equipment breakdown. It is done periodically and very well planned.

Which of the following can be considered as the worst feature of an aircraft in terms of maintainability?

Easily reachable parts

Requirements of removing number of major structural elements

Easily accessible parts

More accessibility is provided for components

Correct Answer : Option (B) : Requirements of removing number of major structural elements

Explanation : Easily accessible and reachable parts are primary requirement of maintainability considerations. Accessibility directly affects the effort and maintainability of an aircraft. If a design requires removal of major structural elements to access the component then, it is considered as the worst design based on maintainability.

What is corrective maintenance?

Scheduled maintenance

Pre break down maintenance

Maintenance of equipment after failure or break down

Maintenance before break down

Correct Answer : Option (C) : Maintenance of equipment after failure or break down

Explanation : Corrective maintenance is done after breakdown or failure. Maintenance done before breakdown is called preventive maintenance. Scheduled maintenance is similar to preventive.