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CPL Test Series
Question Bank
Questions for KW MACHMETER
Answer the following questions
Test Mode
Training Mode
1. 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.
2. 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.
Pitot pressure.
The ratio of (static pressure + pitot pressure) : pitot pressure.
3. What is the local speed of sound at sea level if the ambient temperature is 20°C?
680 Kts.
677 Kts.
666 Kts.
661 Kts.
4. When descending at constant CAS, if temperature remains constant the indicated mach number will?
Decrease
Increase exponentially.
Remain constant.
Increase.
5. A mach meter comprises of?
An altimeter with its scale marked in mach numbers.
An ASI with its scale marked in mach numbers.
A combination of ASI and altimeter.
A combination of VSI and altimeter.
6. The speed of sound at 25000 ft ISA is?
606 Kts.
602 Kts.
600 Kts.
604 Kts.
7. The speed of sound at ISA msl is?
560 Kts.
660 Kts.
670 Kts.
550 Kts.
8. If temperature increases by 5 degrees C during a constant mach number descent, what will happen to CAS?
Remain constant.
Increase or decrease depending on whether conditions are above or below ISA.
Increase by 5 Kts.
Increase by 10 Kts.
9. 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 or over read depending on temperature.
Under read.
Over read.
10. How will mach meter indication respond if an aircraft passes through a cold front when flying at constant CAS and altitude?
Increase.
Increase or decrease depending on altitude.
Remain constant.
Decrease.
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 _______?
Increase increase
Not change increase.
Not change decrease.
Decrease decrease.
12. If the static source becomes blocked the mach meter will ________ as an aircraft climbs?
Freeze.
Under indicate.
Not indicate.
Over indicate.
13. How will mach meter indication vary in a constant CAS cilmb?
Increase then remain constant.
Increase.
remain constant.
Decrease.
14. 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 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.
15. Mach meter indications are derived from?
(Ps - PT)/Ps.
(Pr - Ps) Pr.
(Pr - Ps)/Ps.
(Ps - Pr)/PT.
16. A mach meter compares?
(Ps - Pr) to Pr.
(Pr - Ps) to Pr.
(Ps - Pr) to Ps.
(Pr - Ps) to Ps.
17. When climbing at constant mach number below the torpopause in the ISA, the CAS will?
Decrease then remain constant.
Remain constant.
Increase.
Decrease.
18. What is true mach number at 25000 ft ISA the TAS is 500 Kts?
0.75M.
0.93M.
0.90M
0.83M.
19. If ambient temperature is -10°C, what is the mach number when TAS in 594 Kts?
1.5M.
0.75M.
0.5M.
0.94M.
20. Mach meter indications?
Are temperature related.
Increase with temperature.
Are independent of temperature.
Decrease with temperature.
21. What is the LSS at 30000 ft if ambient temperature is -40°C?
594 Kts.
660 Kts.
584 Kts.
579 Kts.
22. It temperature decreases when flying at constant CAS at FL 200, the mach meter indication will _________ and the true mach number will _________?
Increase Increase.
Decrease decrease.
Not change increase.
Not change not change.
23. How will the mach meter respond in a constant mach number climb if the static source becomes blocked?
Decrease.
Increase of decrease depending on airspeed.
Remain constant.
Increase.
24. What should the mach meter indicate when flying at 500 kts TAS at FL 250, if the ambient temperature is -30° C?
0.82M
0.72M.
0.52M
0.62M.
25. If an aircraft climbs at constant TAS from FL 200 to FL 400 the mach meter indication will?
Increase.
Decrease.
Decrease then remain constant.
Increase then remain constant.
26. Mach number is the ratio of?
CAS:LSS.
RAS:TAS.
TAS:LSS.
IAS:TAS.
27. Mach meter Indications?
Vary with airspeed and temperature.
Vary with density and altitude.
Vary only with temperature.
Vary only with airspeed.
28. Which of the following best defines Mach number?
The ratio of TAS:LSS.
The ratio of ambient density to that at msl in the ISA.
The ratio of LSS:TAS.
The ratio of CAS:LSS.
29. 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.
Increase or decrease depending on TAT.
30. The indications on a mach meter are independent of?
Ambient temperature.
Dynamic pressure.
Static pressure.
Total pressure.
31. What happens to TAT when an aircraft descends at constant indicated mach number?
Remains constant then increases.
Increases.
Remain constant.
Decreases.
32. 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.
33. How will the mach meter respond in a constant CAS climb if the static source becomes blocked?
Increase of decrease depending on airspeed.
Decrease.
Increase.
Remain constant.
34. What is the LSS at msl ISA?
600 Kts.
661 Kts.
750 Kts.
550 Kts.
35. VMO is calculated based on?
CAS.
EAS.
TAS.
RAS.
36. What is the LSS at 50000 ft in the ISA?
550 Kts.
542 Kts.
573 Kts.
660 Kts.
37. How will CAS respond if temperature increases by 5 degrees C when flying at a constant indicated mach number at FL290?
Decreases.
Remains approximately constant.
Increases.
Depends on conditions relative to ISA.
38. What happens to mach meter indication in a constant RAS climb?
Increase then remains constant.
Decrease.
Increase unless in an inversion or lsothermal layer.
Increases.
39. When descending at constant CAS, the TAT and mach meter indications should?
Increase then remain constant decrease.
Increase increase.
Remain constant remain constant.
Increase decrease.
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