2A651 CDC 4
Study guide q&a 2a651 cdc 4
- 1.
1. (601) Which 54H60–91 propeller subassembly transmits engine torque to the propeller blades?
- A.
Barrel
- B.
Control
- C.
Low pitch stop
- D.
Pitchlock regulator
Correct Answer
A. Barrel -
- 2.
2. (601) On the 54H60–91 propeller, which component delivers the actual propeller blade angle from the blade to the control assembly?
- A.
Microadjusting ring
- B.
Beta feedback shaft
- C.
Blade segment gear
- D.
Blade Bushing
Correct Answer
B. Beta feedback shaft -
- 3.
3. (601) On the 54H60–91 propeller, which is a function of the pitchlock regulator?
- A.
Stops the dome piston from increasing blade angle above 23.3°.
- B.
Prevents the blades from decreasing pitch if hydraulic pressure is lost.
- C.
Prevents the cam bearing rollers from bottoming out in the track slopes.
- D.
Prevents the propeller from going into the beta range when the throttle is positioned in alpha range.
Correct Answer
B. Prevents the blades from decreasing pitch if hydraulic pressure is lost. -
- 4.
4. (601) On the 54H60–91 propeller, which pitchlock component mechanically holds the stationary and rotating pitchlock ratchets apart during reversing and unfeathering operations?
- A.
Pitchlock control cam.
- B.
Pitchlock ratchet piston.
- C.
Externally threaded ring
- D.
Externally splined spacer ring.
Correct Answer
A. Pitchlock control cam. -
- 5.
5. (601) On the 54H60–91 propeller, which component is used in place of a shim plate on the No. 1 blade?
- A.
Beveled thrust washer.
- B.
Stationary ratchet.
- C.
Beta segment gear.
- D.
Blade barrel shim.
Correct Answer
C. Beta segment gear. -
- 6.
6. (601) On the 54H60–91 propeller, which dome assembly part allows the rotating cam to turn while the stationary cam remains in a fixed position?
- A.
Roller shaft.
- B.
Track slopes.
- C.
Ball bearings.
- D.
Roller bearings.
Correct Answer
C. Ball bearings. -
- 7.
7. (601) On the 54H60–91 propeller, what function is a task of the low pitch stop assembly?
- A.
Prevents the propeller from going into the beta range when the throttle is positioned in the alpha range.
- B.
Limits cam travel and prevents the propeller from exceeding feather and reverse blade angles.
- C.
Prevents the blades from decreasing pitch if an overspeed condition occurs.
- D.
Transmits engine torque to the blades.
Correct Answer
A. Prevents the propeller from going into the beta range when the throttle is positioned in the alpha range. -
- 8.
8. (601) On the 54H60–91 propeller, which component provides a means for balancing the propeller?
- A.
Deicer contact ring holder.
- B.
Hub mounting bulkhead.
- C.
Front spinner.
- D.
Afterbody.
Correct Answer
B. Hub mounting bulkhead. -
- 9.
9. (602) On the 54H60–91 propeller, hydraulic fluid is directed from the pump housing to the barrel assembly through what component?
- A.
Valve housing.
- B.
Low pitch stop.
- C.
Transfer bearing.
- D.
Pitchlock regulator.
Correct Answer
C. Transfer bearing. -
- 10.
10. (602) On the 54H60–91 propeller, what is the function of the differential gear train assembly?
- A.
Drives the main and standby pressure pumps.
- B.
Controls operation of the pilot valve and serves as an electrical ground.
- C.
Drives the rotating sleeve when the throttle is positioned in the beta range.
- D.
Transmits blade angle movement to the valve housing and drives the propeller governor flyweights.
Correct Answer
D. Transmits blade angle movement to the valve housing and drives the propeller governor flyweights. -
- 11.
11. (602) On the 54H60–91 propeller, during normal propeller operation, the output of which pumps is used?
- A.
Main pressure and main scavenge.
- B.
Standby pressure and main scavenge.
- C.
Auxiliary pressure and main pressure.
- D.
Auxiliary pressure and auxiliary scavenge.
Correct Answer
A. Main pressure and main scavenge. -
- 12.
12. (602) On the 54H60–91 propeller, which pump assists the main pressure pump when large blade angle movements are required?
- A.
Main scavenge.
- B.
Standby pressure.
- C.
Auxiliary pressure.
- D.
Auxiliary scavenge.
Correct Answer
B. Standby pressure. -
- 13.
13. (602) On the 54H60–91 propeller, which cam disarms the NTS system linkage when the throttle is positioned in the beta range?
- A.
Manual feather.
- B.
Beta follow-up.
- C.
Speed set.
- D.
Beta set.
Correct Answer
A. Manual feather. -
- 14.
14. (602) On the 54H60–91 propeller, which valve, contained in the valve housing, controls the flow of hydraulic fluid to and from the dome assembly
- A.
Standby
- B.
Feather.
- C.
Backup.
- D.
Pilot.
Correct Answer
D. Pilot. -
- 15.
15. (602) The 54H60–91 propeller governor speeder spring tension positions the pilot valve to maintain what percent rpm in the beta range?
- A.
99 to 103%.
- B.
104 to 108%.
- C.
109 to 113%.
- D.
114 to 118%.
Correct Answer
C. 109 to 113%. -
- 16.
16. (603) On the 54H60–91 propeller, when the throttle is moved to the GROUND IDLE position, what degree setting does the coordinator pointer indicate on the protractor?
- A.
0°.
- B.
18°.
- C.
34°.
- D.
90°.
Correct Answer
B. 18°. -
- 17.
17. (603) What switch, located in the control quadrant, activates the 54H–60–91 propeller governor speed bias servo assembly as the throttle is moved into the flight idle gate?
- A.
Beta indicator.
- B.
Landing gear warning.
- C.
Low speed ground idle.
- D.
Synchrophaser disarming.
Correct Answer
D. Synchrophaser disarming. -
- 18.
18. (603) The condition lever GND STOP position is only effective on the ground because the circuits made in this position are completed through what switches?
- A.
Landing gear touchdown
- B.
Low speed ground idle.
- C.
Landing gear warning.
- D.
Air start.
Correct Answer
A. Landing gear touchdown -
- 19.
19. (603) What component in the T56 engine coordinator provides reference signals to the electronic TD amplifier that are proportional to the desired TIT?
- A.
Feather shaft.
- B.
Potentiometer.
- C.
65º microswitch.
- D.
66º microswitch.
Correct Answer
B. Potentiometer. -
- 20.
20. (604) On the 54H60–91 propeller, the output of what pump is sufficient to supply hydraulic pressure for normal propeller operation?
- A.
Auxiliary pressure.
- B.
Standby pressure.
- C.
Backup pressure.
- D.
Main pressure.
Correct Answer
D. Main pressure. -
- 21.
21. (604) On the 54H60–91 propeller, if the main filter becomes clogged, which valve opens to assure continued flow?
- A.
Check.
- B.
Bypass.
- C.
Low pressure relief.
- D.
High pressure relief.
Correct Answer
B. Bypass. -
- 22.
22. (604) On the 54H60–91 propeller, which valve sets and maintains a pressure differential of about 100 psi between system pressure and the increase- or decrease-pitch pressure?
- A.
Check.
- B.
Bypass.
- C.
Low-pressure relief.
- D.
High-pressure relief.
Correct Answer
C. Low-pressure relief. -
- 23.
23. (604) On the 54H60–91 propeller, when the backup valve is opened, the hydraulic pressure routed to the governor pilot valve is used for which operation?
- A.
Pitchlock.
- B.
Standby.
- C.
Reverse.
- D.
Airstart.
Correct Answer
C. Reverse. -
- 24.
24. (604) On the 54H60–91 propeller, which pump is used to feather or unfeather the propeller during static propeller operation?
- A.
Main.
- B.
Backup.
- C.
Standby.
- D.
Auxiliary.
Correct Answer
D. Auxiliary. -
- 25.
25. (604) On the 54H60–91 propeller, which type of valve opens to allow the output of the standby pump to combine with the output of the main pump?
- A.
Check.
- B.
Bypass.
- C.
Low pressure relief.
- D.
High pressure relief.
Correct Answer
A. Check. -
- 26.
26. (605) The purpose of the 54H60–91 propeller pitchlock assembly is to prevent
- A.
The loss of oil pressure.
- B.
An engine overspeed due to a loss of power.
- C.
The flow of hydraulic fluid to the pilot valve.
- D.
An engine overspeed due to a loss of hydraulic pressure.
Correct Answer
D. An engine overspeed due to a loss of hydraulic pressure. -
- 27.
27. (605) On the 54H60–91 propeller, what prevents engagement of the stationary and rotating ratchets at blade angles below 25° and above 55°?
- A.
An overspeed of 103.5%.
- B.
The pitchlock control cam.
- C.
A loss of hydraulic pressure.
- D.
Increase- or decrease pitch pressure.
Correct Answer
B. The pitchlock control cam. -
- 28.
28. (605) On the 54H60–91 propeller, between the blade angles of 25° and 55°, what will keep the rotating and stationary ratchets disengaged?
- A.
An overspeed of 103.5%.
- B.
The pitchlock control cam.
- C.
A loss of hydraulic pressure.
- D.
Increase- or decrease pitch pressure.
Correct Answer
D. Increase- or decrease pitch pressure. -
- 29.
29. (605) On the 54H60–91 propeller, the function of the low pitch stop is to prevent the
- A.
Propeller barrel from decreasing blade angle below 23.3° ± .5°.
- B.
Dome piston from decreasing blade angle below 23.3° ± .5°.
- C.
Propeller barrel from decreasing blade angle below 34° ± .5°.
- D.
Dome piston from decreasing blade angle below 34° ± .5°.
Correct Answer
B. Dome piston from decreasing blade angle below 23.3° ± .5°. -
- 30.
30. (605) On the 54H60–91 propeller, what forces the stop levers on the low pitch stop to move outward?
- A.
Wedge.
- B.
Servo valve.
- C.
Dome piston.
- D.
Hydraulic pressure.
Correct Answer
A. Wedge. -
- 31.
31. (605) On the 54H60–91 propeller, when pressure builds to between 240 and 280 psi, which valve is unseated and allows the stop levers to retract?
- A.
Low pressure relief.
- B.
Governor pilot.
- C.
Backup.
- D.
Servo.
Correct Answer
D. Servo. -
- 32.
32. (606) What is coordinated by the throttle in the controllable pitch range?
- A.
Blade pitch and engine fuel flow.
- B.
Blade pitch and temperature limiting.
- C.
Engine fuel flow and constant speed governing.
- D.
Temperature limiting and constant speed governing.
Correct Answer
A. Blade pitch and engine fuel flow. -
- 33.
33. (607) On the 54H60–91 propeller, during beta range operation, what moves the pilot valve?
- A.
Throttle.
- B.
Hydraulic pressure.
- C.
Cams and mechanical linkage.
- D.
Flyweights and speeder spring.
Correct Answer
C. Cams and mechanical linkage. -
- 34.
34. (607) On the 54H60–91 propeller, during beta range operation, the rotation of which cam moves the mechanical linkage to center the governor pilot valve?
- A.
Beta set.
- B.
Speed set.
- C.
Backup valve.
- D.
Beta follow-up.
Correct Answer
D. Beta follow-up. -
- 35.
35. (607) On the 54H60–91 propeller, during alpha range operation, which cam changes speeder spring tension so the governor pilot valve can maintain 100 percent rpm?
- A.
Beta set.
- B.
Speed set.
- C.
Backup valve.
- D.
Beta follow-up
Correct Answer
B. Speed set. -
- 36.
36. (607) On the 54H60–91 propeller, during an underspeed condition, what moves the pilot valve?
- A.
Decreased hydraulic pressure.
- B.
Increased hydraulic pressure.
- C.
Speeder spring.
- D.
Flyweights.
Correct Answer
C. Speeder spring. -
- 37.
37. (608) On the 54H60–91 propeller, when feathering the propeller, what acts on the mechanical linkage to open the feather actuating valve?
- A.
Throttle.
- B.
Beta shaft.
- C.
Pilot valve.
- D.
Manual feather cam.
Correct Answer
D. Manual feather cam. -
- 38.
38. (608) On the 54H60–91 propeller, during feathering operation, the feather valve is positioned to meter hydraulic fluid to the
- A.
Aft end of the dome piston.
- B.
Forward end of the dome piston.
- C.
Decrease-pitch side of the pilot valve.
- D.
Increase-pitch side of the pilot valve.
Correct Answer
B. Forward end of the dome piston. -
- 39.
39. (608) On the 54H60–91 propeller, which valve is a backup in case the feather valve fails during feathering operation?
- A.
Pilot.
- B.
Feather solenoid.
- C.
Feather actuating.
- D.
Feather actuating.
Correct Answer
A. Pilot. -
- 40.
40. (608) As the 54H60–91 propeller feathers, the output of which pump decreases (drops off)?
- A.
Auxiliary pressure.
- B.
Auxiliary scavenge.
- C.
Main scavenge.
- D.
Feather.
Correct Answer
C. Main scavenge. -
- 41.
41. (608) On the 54H60–91 propeller, during feather operation, between approximately what psi are the pressure cutout switch contacts opened?
- A.
0 to 200.
- B.
300 to 500.
- C.
300 to 500.
- D.
900 to 1,100.
Correct Answer
C. 300 to 500. -
- 42.
42. (608) On the 54H60–91 propeller, which component is the primary electrical ground for energizing the feather override holding coil?
- A.
Feather relay.
- B.
Feather solenoid.
- C.
Pressure cutout switch.
- D.
PCBS.
Correct Answer
C. Pressure cutout switch. -
- 43.
43. (608) When attempting to unfeather the 54H60–91 propeller in flight, where must the throttle be positioned?
- A.
Any throttle position.
- B.
Above FLT IDLE.
- C.
Above FLT IDLE.
- D.
At GND IDLE.
Correct Answer
B. Above FLT IDLE. -
- 44.
44. (608) Which two cams, on the alpha shaft, control the 54H60–91 propeller unfeathering operation?
- A.
Manual feather and pressure cutout backup switch.
- B.
Speed set and pressure cutout backup switch.
- C.
Speed set and beta follow-up.
- D.
Manual feather and beta set.
Correct Answer
D. Manual feather and beta set. -
- 45.
45. (608) On the 54H60–91 propeller, what is the minimum psi required to release the feather latches and allow the piston to move forward?
- A.
200.
- B.
400.
- C.
600.
- D.
800.
Correct Answer
A. 200. -
- 46.
46. (608) On the 54H60–91 propeller, after the NTS system actuator rod positions the mechanical linkage in the valve housing when a negative torque condition occurs, what component is shifted?
- A.
Speed set cam.
- B.
Feather valve.
- C.
Beta set cam.
- D.
Pilot valve.
Correct Answer
B. Feather valve. -
- 47.
47. (609) Besides maintaining the optimum blade phase angle relationship between all propellers, what else does synchrophasing do?
- A.
Keeps the propellers rotating at the same speed.
- B.
Keeps the propellers rotating at different speeds.
- C.
Prevents the pilot valve from shifting to increase blade angle.
- D.
Prevents the pilot valve from shifting to decrease blade angle.
Correct Answer
A. Keeps the propellers rotating at the same speed. -
- 48.
48. (609) The fuel governing check switches are used to reset the propeller governor to what percentage of rpm in the alpha range?
- A.
100%
- B.
102%
- C.
104%
- D.
106%
Correct Answer
D. 106% -
- 49.
49. (609) Where is the pickup portion of the pulse generator located?
- A.
No. 1 blade.
- B.
Pump housing.
- C.
Valve housing.
- D.
Valve housing.
Correct Answer
B. Pump housing. -
- 50.
50. (609) The pulse generator inputs to the synchrophaser unit are used only
- A.
To drive the feedback potentiometer.
- B.
As a backup for throttle anticipation.
- C.
When a master propeller is selected.
- D.
To indicate actual rpm.
Correct Answer
C. When a master propeller is selected. -
Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
-
Current Version
-
Jan 31, 2013Quiz Edited by
ProProfs Editorial Team -
Nov 14, 2011Quiz Created by
Spalliero
- ACA Quizzes
- ACCA Quizzes
- ACE Quizzes
- BCBA Quizzes
- CCP Quizzes
- CDCs Quizzes
- CEH Quizzes
- CISA Quizzes
- CISCO Quizzes
- CISSP Quizzes
- CompTIA Quizzes
- CPA Quizzes
- CPAT Quizzes
- CPFA Quizzes
- CPP Quizzes
- CPT Quizzes
- CSA Quizzes
- CSET Quizzes
- CST Quizzes
- CSWIP Quizzes
- FTCE Quizzes
- HIPAA Quizzes
- IAHCSMM Quizzes
- ISTQB Quizzes
- LEED Ga Quizzes
- MBLEx Quizzes
- TEAS Quizzes
Back to top