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