7.12 Transmissions Flashcards
What are the five types of gear wear?
A. Overload wear, Pitting & spalling, Cracking and breakage, Interference wear, Abrasive wear.
B. Overload wear, Corrosion wear, Thermal wear, Pitting & spalling, Lubrication wear.
C. Friction wear, Abrasive wear, Cracking wear, Overload wear, Pitting wear.
A. Overload wear, Pitting & spalling, Cracking and breakage, Interference wear, Abrasive wear.
What is usually the cause of gear failure or premature wear?
A. Excessive backlash and/or poor lubrication.
B. Incorrect gear material.
C. Too much oil in the gears.
A. Excessive backlash and/or poor lubrication.
What is equally important to ensure proper gear function?
A. Gear alignment and fit.
B. The color of the gear.
C. The weight of the gear.
A. Gear alignment and fit.
What causes overload wear in gears?
A. Heavy contact between gear teeth squeezes out the lubricant and can cause micro-welds.
B. Incorrect gear alignment leads to stress on the teeth.
C. Excessive lubrication between gear teeth.
A. Heavy contact between gear teeth squeezes out the lubricant and can cause micro-welds.
What is cracking and breakage in gears usually caused by?
A. A failure in the heat treatment process.
B. Excessive friction between gear teeth.
C. Inadequate lubrication during operation.
A. A failure in the heat treatment process.
When must wear patterns be examined?
A. Before final assembly, during service, during overhaul, and after a failure.
B. Only during overhaul.
C. Only before final assembly.
A. Before final assembly, during service, during overhaul, and after a failure.
What can be used to establish a tooth contact pattern?
A. A magnifying glass.
B. Prussian blue, a blue-dyed soft paste.
C. A specialized digital scanner.
B. Prussian blue, a blue-dyed soft paste.
What does normal wear on gear teeth leave behind?
A. A cracked surface.
B. A polished surface on the tooth face.
C. A rough, unpolished surface.
B. A polished surface on the tooth face.
Why is backlash needed in gear systems?
A. To allow space for lubrication and gear expansion.
B. To increase the speed of gear rotation.
C. To prevent gears from wearing out.
A. To allow space for lubrication and gear expansion.
What does backlash in a gear system refer to?
A. The distance between the gear teeth when they are fully engaged.
B. The play between mating tooth surfaces at the tightest point of mesh.
C. The speed at which the gears rotate.
B. The play between mating tooth surfaces at the tightest point of mesh.
How can backlash in a gear train be measured?
A. Using a DTI or feeler gauge to measure tangential movement.
B. Using a digital thermometer to measure temperature change.
C. Using a magnifying glass to check the gear teeth.
A. Using a DTI or feeler gauge to measure tangential movement.
What is the typical percentage limit of deflection/elongation for chains when loaded with the correct tension?
A. 0.5% to 1%
B. 1.5% to 3%
C. 4% to 5%
B. 1.5% to 3%
What should be done if a chain shows signs of corrosion or other defects?
A. It should be cleaned and reinstalled.
B. It should be replaced.
C. It should be lubricated and rechecked.
B. It should be replaced.
What must drive belts and pulleys be inspected for?
A. Wear and degradation, cracking and splitting, chipping and fraying.
B. Rust and corrosion, cracks, and grease buildup.
C. Overheating and vibrations.
A. Wear and degradation, cracking and splitting, chipping and fraying.
What is the recirculating ball mechanism commonly referred to as?
A. Lead screw actuator.
B. Ball screw actuator.
C. Gear actuator.
B. Ball screw actuator.
What is the primary use of a recirculating ball mechanism in aircraft?
A. To control the landing gear system.
B. To operate the aircraft’s flap drive system.
C. To adjust the aircraft’s speed.
B. To operate the aircraft’s flap drive system.
What are the two primary maintenance concerns when inspecting a recirculating ball mechanism?
A. Lubrication and backlash.
B. Friction and heat.
C. Tension and corrosion.
A. Lubrication and backlash.
What happens to the nut on the lead screw in a recirculating ball mechanism?
A. It moves in a rotary direction along the screw thread shaft.
B. It moves in a linear direction along the screw thread shaft.
C. It stays stationary while the screw rotates.
B. It moves in a linear direction along the screw thread shaft.
What do the witness holes in the adjustable eye-end fitting of push-pull rods allow for?
A. To check the weight of the control rod.
B. To inspect if the adjustable end is sufficiently screwed onto the threaded portion of the control rod.
C. To measure the diameter of the control rod.
B. To inspect if the adjustable end is sufficiently screwed onto the threaded portion of the control rod.
What is the purpose of a bell crank in a mechanical system?
A. To increase the force applied.
B. To transmit force or motion and permit a change in direction of that force or motion.
C. To reduce friction in the system.
B. To transmit force or motion and permit a change in direction of that force or motion.
Is adjustment typically required for a bell crank?
A. Yes, it requires frequent adjustments for optimal function.
B. No, there is usually no adjustment required for a bell crank.
C. It requires adjustment only during installation.
B. No, there is usually no adjustment required for a bell crank.
What are push-pull rods used for?
a) Transmitting electrical signals
b) Transmitting force or motion and permitting a change in direction
c) Connecting hydraulic systems
b) Transmitting force or motion and permitting a change in direction
