Power1

In a gas turbine engine, combustlon occurs at a constant. volume. density. pressure. velocity.

At higher subsonic speed, the type of engine which affords the most efficlent propulsive power is the. turbofan. turboprop. turbojet. turboshaft.

A typical cool-down period for an APU is. 3 minutes. 6 minutes. 10 minutes. not required.

When a gas or fluid is supplied through a divergent duct, if pressure increases. thrust will increase. velocity will increase. velocity will decrease. temperature will decrease.

. Engine manufacturers' calculations of static thrust are based on a temperature of. 13°C. 15°C. 17°C. 20°C.

What is meant by "shrouded turblne blades?". The turbine blades are shaped so that thelr ends form a band or a shroud. The turbine wheel is enclosed In a protectlve shroud to contaln the blades in case of failure. The turbine wheel has a shroud or duct which provldes cooling alr to the turbine blades. The turbine wheel is enclosed in a protectlve shroud to contaln the blades and provide cooling air to the turbine blades.

In a turbine engine, the hlghest pressure is found. immediately aft of the turbine section. at the entrance of the turbine section. In the diffuser sectlon, entrance of the burner section. at the outlet of the tail plpe section.

High EGT, high fuel flow and low rpm at all engine power settings is most likely caused by. turbine damage. misaligned exhaust duct. FCU out of adjustment. Unserviceable variable Inlet gulde vanes.

Compressor blades which have a reduced thickness at the tips are referred to as. blisk or creeper blades. proflle or squeeler blades. shrouded tip profle blades. twist-tip or creep blades.

The primary alrflow through a combustor. is approximately 75% of the total airflow. Is routed to the fuel nozzle area for combustlon. dilutes the mixture to an acceptable temperature. provides a cooling blanket on either side of the combustor liner.

In a reverse fiow annular combustor, the main airflow enters the combustor from. the rear of the engine. the front of the engine. holes drilled around the combustor. deflectors located at the rear of the combustor.

The most common method of attaching turbine blades to a turbine wheel is with. rivets and roll pins. locktabs and roll pins. the dove tail design. the fir-tree design.

On turbine engines, the type of bearing better equipped to support radial loads rather than thrust loads is the. roller bearing. ball bearing. plain bearing. duplex ball bearing.

On a free turbirne engine, engine control rlgging Is requlred for. N1 only. N2 only. both N1 and N2. none of the above.

If a minute crack ls found on a turbine disk. it must be further inspected with dye penetrant. it must be blended by stoning and polishing. Is Immediate cause for rejectlon of the turblne disk. is acceptable and must be monitored daily.

Turbine blade replacements are identified by code letters indicating the. weight in grams. weight in ounces. moment weight in inch-ounces. weight in one-tenth of an ounce increments.

Variable inlet guide vanes are actuated by means of cylinders which receive operating pressure from. the engine fuel control system. compressor bleed air. the lGV controller. ambient air pressure and compressor bleed air.

A permanent elongation which occurs on turbine blades due to centrifugal force is known as. twist. blisk. creep. deformation.

The type of fuel pump designed to deliver a continuous supply of high pressure fuel to the fuel control unit at a quantity which is in excess of what the engine needs ls the. standby pump. engine driven pump. auxillary pump. electrical booster pump.

The two types of turbine engine fuel nozzles generally used are. simplex and duplex. flow divider and simplex. flow divider and duplex. atomizer and flow divider.

With no change in power setting parameters, high oil temperatures Indicates. gearbox seal leakage. high oll sump pressure. engine maln bearlng distress. abnormal scavernge pump oll flow.

The type of oil system usually found on most turbojet engines is. dry sump, splash and spray. wet sump, dip and pressure. wet sump, splash and spray. dry sump, pressure and spray.

In a gas turbine engine, oil picks up most heat from the. exhaust turbine bearing. compressor bearing. combustor shroud. accessory drive bearings.