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CPL Test Series
Question Bank
Questions for KW MACHMETER
Answer the following questions
Test Mode
Training Mode
1. Mach number is the ratio of?
IAS:TAS.
TAS:LSS.
RAS:TAS.
CAS:LSS.
2. When descending at constant CAS, the TAT and mach meter indications should?
Remain constant remain constant.
Increase decrease.
Increase then remain constant decrease.
Increase increase.
3. What is the LSS at msl ISA?
600 Kts.
550 Kts.
661 Kts.
750 Kts.
4. What does mach number represent?
The local speed of sound as a fraction of the CAS of an aircraft.
The local speed of sound as a fraction of the CAS of an aircraft.
The TAS of an aircraft as a fraction of the local speed of sound.
The CAS of an aircraft as a fraction of the local speed of sound.
5. What happens to mach meter indication in a constant RAS climb?
Increase then remains constant.
Increase unless in an inversion or lsothermal layer.
Increases.
Decrease.
6. What is true mach number at 25000 ft ISA the TAS is 500 Kts?
0.93M.
0.75M.
0.83M.
0.90M
7. If an aircraft climbs at constant TAS from FL 200 to FL 400 the mach meter indication will?
Decrease then remain constant.
Increase.
Decrease.
Increase then remain constant.
8. What happens to TAT when an aircraft descends at constant indicated mach number?
Remains constant then increases.
Decreases.
Increases.
Remain constant.
9. A mach meter is made up of?
An ASI with an altitude capsule.
An ASI with a modified scale.
A VSI with a modified scale.
An altimeter with a density capsule.
10. When descending at constant CAS, if temperature remains constant the indicated mach number will?
Increase exponentially.
Decrease
Remain constant.
Increase.
11. What would happen if the static pipe became detached from the back of a mach meter in a pressurised aircraft at high altitude?
Under read or over read depending on temperature.
No effect.
Over read.
Under read.
12. What is the LSS at 30000 ft if ambient temperature is -40°C?
584 Kts.
594 Kts.
579 Kts.
660 Kts.
13. What is actually measured by a mach meter?
Pitot pressure.
The ratio of (pitot pressure - static pressure) : static pressure.
The ratio of (static pressure + pitot pressure) : pitot pressure.
The ratio of static pressure to dynamic pressure.
14. A mach meter indicates mach number based on the ratio of?
Pitot pressure to static pressure.
Dynamic pressure to static pressure.
Static pressure to pitot pressure.
Static pressure to dynamic pressure.
15. If temperature increases by 5 degrees C during a constant mach number descent, what will happen to CAS?
Increase or decrease depending on whether conditions are above or below ISA.
Increase by 5 Kts.
Remain constant.
Increase by 10 Kts.
16. The speed of sound at ISA msl is?
550 Kts.
670 Kts.
560 Kts.
660 Kts.
17. The indications on a mach meter are independent of?
Dynamic pressure.
Static pressure.
Ambient temperature.
Total pressure.
18. How will mach meter indication respond if an aircraft passes through a cold front when flying at constant CAS and altitude?
Decrease.
Increase.
Increase or decrease depending on altitude.
Remain constant.
19. How will the mach meter respond in a constant CAS climb if the static source becomes blocked?
Increase.
Decrease.
Remain constant.
Increase of decrease depending on airspeed.
20. How will mach meter indication vary in a constant CAS cilmb?
Increase then remain constant.
remain constant.
Increase.
Decrease.
21. What is the local speed of sound at sea level if the ambient temperature is 20°C?
661 Kts.
666 Kts.
680 Kts.
677 Kts.
22. A mach meter compares?
(Ps - Pr) to Pr.
(Pr - Ps) to Ps.
(Pr - Ps) to Pr.
(Ps - Pr) to Ps.
23. VMO is calculated based on?
RAS.
TAS.
CAS.
EAS.
24. Mach meter Indications?
Vary only with airspeed.
Vary with density and altitude.
Vary only with temperature.
Vary with airspeed and temperature.
25. Mach meter indications are derived from?
(Ps - PT)/Ps.
(Ps - Pr)/PT.
(Pr - Ps) Pr.
(Pr - Ps)/Ps.
26. If ambient temperature is -10°C, what is the mach number when TAS in 594 Kts?
0.94M.
0.5M.
1.5M.
0.75M.
27. When climbing at constant mach number below the torpopause in the ISA, the CAS will?
Decrease then remain constant.
Increase.
Remain constant.
Decrease.
28. If the static source becomes blocked the mach meter will ________ as an aircraft climbs?
Not indicate.
Freeze.
Over indicate.
Under indicate.
29. If ambient temperature increases by 10 degrees, for an aircraft flying at constant TAS, the indicated mach number will ______ and the true mach number will _______?
Not change increase.
Decrease decrease.
Increase increase
Not change decrease.
30. What should the mach meter indicate when flying at 500 kts TAS at FL 250, if the ambient temperature is -30° C?
0.62M.
0.52M
0.82M
0.72M.
31. Which of the following best defines Mach number?
The ratio of CAS:LSS.
The ratio of ambient density to that at msl in the ISA.
The ratio of TAS:LSS.
The ratio of LSS:TAS.
32. A mach meter comprises of?
A combination of ASI and altimeter.
An ASI with its scale marked in mach numbers.
A combination of VSI and altimeter.
An altimeter with its scale marked in mach numbers.
33. How will CAS respond if temperature increases by 5 degrees C when flying at a constant indicated mach number at FL290?
Depends on conditions relative to ISA.
Remains approximately constant.
Decreases.
Increases.
34. How will the mach meter respond in a constant mach number climb if the static source becomes blocked?
Increase.
Remain constant.
Decrease.
Increase of decrease depending on airspeed.
35. What is the LSS at 50000 ft in the ISA?
550 Kts.
660 Kts.
542 Kts.
573 Kts.
36. The speed of sound at 25000 ft ISA is?
604 Kts.
606 Kts.
602 Kts.
600 Kts.
37. Mach meter indications?
Are independent of temperature.
Increase with temperature.
Are temperature related.
Decrease with temperature.
38. It temperature decreases when flying at constant CAS at FL 200, the mach meter indication will _________ and the true mach number will _________?
Increase Increase.
Not change not change.
Decrease decrease.
Not change increase.
39. How will mach meter indication respond if an aircraft is flying at constant CAS at FL 270 when it experiences a reduction in OAT?
No change.
Increase.
Decrease.
Increase or decrease depending on TAT.
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