engines test 3, sem 2

通報

問題一覧

The accessory case provides a mounting pad to drive the engine accessories T/F

true

The accessory case may act as a oil reservoir T/F

true

Gears are sometimes used in aircraft instruments T/F

True

What type of gear sets are used in accessory gearbox tower-shafts?

bevel gears

The intermediate gearbox can be used to transfer the input from the tower shaft and change its direction to the main gearbox T/F

True

Which accessory is driven by and can drive the accessory gearbox? (HYD pump, Generator, Fuel pump)

starter generator

PT6 reduction gearbox the first stage has the sun gear being driven by engine driving three planetary gears around a fixed ring gear

True. • The PT6 engines use a planetary type reduction gearbox system with two stages of reduction.

PT6 reduction gearbox the second stage of reduction has a sun gear being driven by the first stage planetary carriage.

True. • The second stage reduction system is similar to the first stage but uses five planet gears instead of three.

The reduction gearbox on a turboprop can also have accessory drives T/F

True

The reduction gearbox on a turboprop engine reduces prop speed to approximately what RPM?

2000 RPM

A reduction gearbox has a 10:1 reduction ratio. If the engine turns at 20,000 RPM what will the propeller turn at?

2000 RPM

Helicopter transmissions use worm gears T/F

false. uses planetary gear system

Where can we find wear and damage limits regarding engines or gearboxes?

AMM and CMM

Using servo bleed air can cause EGT, EPR and fuel efficiency to rise T/F

False. As per Dave EGT increases, EPR increases, and fuel efficiency decreases.

Bearings and bearing cambers are cooled by turbine bleed air T/F

false, uses compressor bleed air

EPR is the name of the system that is designed to burn up all the remaining fuel after shutdown T/F.

False, EPA (environmental protection agency)

Gearboxes are usually equipped with ____ to visually determine if there is internal damage

Magnetic Chip Detector (Also may be usage of differential pressure indicator)

HPTACC & LPTACC aid in efficiency at low altitudes and high power settings T/F

False, high altitude low power

The exhaust section of a turbine engine has zero influence on overall thrust output T/F

False

most common gear that is found in an accessory gearbox is?

spur gear

Water and glycol are injected into some engines to reduced internal temperatures T/F

False - Water and Methanol

What was installed on the Boeing 727 JT8 engines to reduce its noise output besides noise suppression material?

hush kits, cookie cutters

When would we calibrate an engine torque meter/ HP gauge?

Calibrate the HP gauge anytime performance run is to be carried out, or accuracy is questioned Replace horsepower gauge if defective.

The ignition system on a turbine engine produces a high voltage/ high amperage spark T/F

True

What components are included in a high-tension ignition system?

High Tension Leads, Exciter Box, Ignitor

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