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