Block 8

Which section of a turbine engine provides high pressure bleed air to an air cycle machine for pressurization and air conditioning?

• Low or high pressure compressor

• Compressor inlet

• C-D inlet compressor duct

• The Air

Hydraulic fluid reservoirs are sometimes designed with a standpipe in one of the

outlet ports in order to assure emergency supply of fluid. The outlet port with the

standpipe in it furnishes fluid to the

• emergency pump when the fluid supply to the normal system has been depleted

• emergency pump at any time it is required

• normal system power pump

The unit in a hydraulic system that requires a certain action to be completed before

another action can begin is called a

• check valve

• sequence valve

• snubber valve

What is the viscosity of hydraulic fluid?

• The increase in volume of a fluid due to temperature change

• The fluid's ability to resist oxidation and deterioration for long periods

• The internal resistance of a fluid which tends to prevent it from flowing

Heat exchanger cooling units are required in some aircraft hydraulic systems because

of?

• fluid flammability

• high pressures and high rates of fluid flow

• the high heat generated from braking

A hydraulic pump is a constant-displacement type if it

• produces an unregulated constant pressure

• produces a continuous positive pressure

• delivers a uniform rate of fluid flow

Extrusion of an O-ring seal is prevented in a high-pressure system by the use of a

• backup ring on the side of the O-ring next to the pressure

• U-ring on the side of the O-ring away from the pressure

• backup ring on the side of the O-ring away from the pressure

If it is necessary to adjust several pressure regulating valves in a hydraulic system,

what particular sequence, if any, should be followed?

• Units most distant from the hydraulic pump should be adjusted first

• - Units with the highest pressure settings are adjusted first

• Units are independent of each other, and therefore, no particular sequence is

  necessary

How many of these seals are used with petroleum-base hydraulic fluids?

• Natural rubber, Ethylene-propylene

• Neoprene, Buna-N

• Natural rubber, Butyl rubber

Which is a characteristic of synthetic-base hydraulic fluid?

• Low moisture retention

• High flash point

• Low flash point