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