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