The Machmeter: DGCA Air Navigation questions

Question 1

The local speed of sound is equal to: K = Constant

Accepted Answer

K multiplied by square root of temperature in Kelvin, in knots

Answer

K multiplied by square root of temperature in degrees Fahrenheit, in knots

Answer

K multiplied by square root of temperature in degrees Celsius, in knots

Answer

K multiplied by square root of temperature in Kelvin, in metres per second

Question 2

At FL350 with an ISA deviation of -12, the true airspeed when flying at M 0.78 is:

Accepted Answer

436 kt

Answer

460 kt

Answer

447 kt

Answer

490 kt

Question 3

When climbing at a constant mach number below the tropopause through an inversion:

Accepted Answer

The CAS will decrease and the TAS will increase

Answer

The CAS and TAS will both increase

Answer

The CAS and TAS will both decrease

Answer

The CAS will increase and the TAS will decrease

Question 4

When descending below the tropopause under normal conditions increasing temperature at a constant CAS:

Accepted Answer

Both TAS and mach number will decrease

Answer

Both TAS and mach number will increase

Answer

The TAS will decrease and the mach number will increase

Answer

The TAS will increase and the mach number will decrease

Question 5

Cruising at FL390, M 0.84 is found to give a TAS of 499 kt. The ISA deviation at this level will be:

Accepted Answer

+17

Answer

-17

Answer

+19

Answer

-19

4 more questions in this chapter