RECIPS
TURBINES
ELECTRICAL
FIRE PROTECTION
FUEL & METERING
100
During overhaul of an engine, a first step of inspection on a crankshaft should be to
perform a runout check.
100
Which of the following acts as a diffuser in a turbine engine and converts velocity to pressure?
Stators.
100
The resistance of the current return path through the aircraft is always considered negligible, provided the
structure is adequately bonded.
100
What is the function of a fire detection system?
To activate a warning device in the event of a powerplant fire.
100
Which type of pump is commonly used as a fuel pump on reciprocating engines?
Vane.
110
One cause of afterfiring in an aircraft engine is
an excessively rich mixture.
110
An exhaust cone placed aft of the turbine in a jet engine will cause the pressure in the first part of the exhaust duct to
increase and the velocity to decrease.
110
The generating system of an aircraft charges the battery by using
constant voltage and varying current.
110
The most satisfactory extinguishing agent for an electrical fire is
carbon dioxide.
110
Fuel lines are kept away from sources of heat, and sharp bends and steep rises are avoided to reduce the possibility of
vapor lock.
120
Backfiring through the carburetor generally results from the use of
an excessively lean mixture.
120
Which of the following may be used to accomplish internal inspection of an assembled turbine engine?
A borescope.
120
The constant current method of charging a nickel-cadmium battery
is the method most effective in maintaining cell balance.
120
A fire involving energized electrical equipment is defined as a
Class C fire.
120
The primary purpose of the air bleed openings used with continuous flow fuel injector nozzles is to
aid in proper fuel vaporization.
130
A condition that can occur in radial engines but is unlikely to occur in horizontally opposed engines is
hydraulic lock.
130
In a gas turbine engine, combustion occurs at a constant
Pressure.
130
Bonding jumpers should be designed and installed in such a manner that they provide
a low electrical resistance in the ground circuit.
130
What is the principle of operation of the continuous-loop fire detector system sensor?
Core resistance material which prevents current flow at normal temperatures.
130
The device that controls the ratio of the air-fuel mixture to the cylinders is called a
mixture control.
140
What is the basic operational sequence for reducing the power output of an engine equipped with a constant-speed propeller?
Reduce the manifold pressure, then the RPM.
140
What term is used to describe a permanent and cumulative deformation of the turbine blades of a turbojet engine?
Creep.
140
What is the maximum number of bonding jumper wires that may be attached to one terminal grounded to a flat surface?
Four.
140
The fire detection system that uses a single wire surrounded by a continuous string of ceramic beads in a tube is the
Fenwal system.
140
If an engine equipped with a float-type carburetor backfires or misses when the throttle is advanced, a likely cause is that the
accelerating pump is not operating properly.
150
Some aircraft engine manufacturers equip their product with choked or taper-ground cylinders in order to
provide a straight cylinder bore at operating temperatures.
150
At what point in an axial-flow turbojet engine will the highest gas pressures occur?
At the compressor outlet.
150
A high surge of current is required when a DC electric motor is first started. As the speed of the motor increases, the counter EMF:
the counter EMF builds up and opposes the applied EMF, thus reducing the current flow through the armature.
150
How is the fire-extinguishing agent distributed in the engine section?
Spray nozzles and perforated tubing.
150
During what period does the fuel pump bypass valve open and remain open?
When the boost pump pressure is greater than fuel pump pressure.
160
If the ignition switch is moved from BOTH to either LEFT or RIGHT during an engine ground check, normal operation is usually indicated by a slight
drop in torque meter pressure indication.
160
Fuel is normally supplied to an APU from the
airplane's main fuel tank.
160
What device is used to convert alternating current, which has been induced into the loops of the rotating armature of a DC generator, to direct current?
A commutator.
160
After a fire is extinguished, or overheat condition removed in aircraft equipped with a Systron-Donner fire detector, the detection system
automatically resets.
160
The purpose of the back-suction mixture control in a float-type carburetor is to adjust the mixture by
regulating the pressure on the fuel in the float chamber.
170
Which bearing is least likely to be a roller or ball bearing?
Master rod bearing (radial engine).
170
A turbine engine compressor which contains vanes on both sides of the impeller is a
double entry centrifugal compressor.
170
What is the smallest terminal stud allowed for aircraft electrical power systems?
No. 10
170
What two detection systems will detect a fire when an element is inoperative but will not test when the test circuit is energized?
The Kidde system and the Fenwal system.
170
The Federal Aviation Regulations require the fuel flow rate for gravity systems (main and reserve) to be
150 percent of the takeoff fuel consumption of the engine.
180
What is true about rolling friction between different types of bearings?
There is less rolling friction when ball bearings are used than when roller bearings are employed.
180
What type of combustion chamber is used in a turbine engine when engine length is critical?
Reverse-flow.
180
If the points in a vibrator-type voltage regulator stick in the closed position while the generator is operating, what will be the probable result?
Generator output voltage will increase.
180
What are the fire-extinguisher container pressure limits when the temperature is 50°F?
475 - 625 psig.
180
Prior to performing engine trimming, you should
obtain a true temperature reading comparable to that of the air that enters the engine.
190
Cam-ground pistons are installed in some aircraft engines to
provide a better fit at operating temperatures.
190
What type igniter plug is used in the low tension ignition system of an aircraft turbofan engine?
Self-ionizing or shunted-gap type plug.
190
When a 28-volt, 75-ampere generator is installed on an aircraft, an electrical load analysis ground check is performed and it is determined that the battery is furnishing 57 amperes to the system, with all electrical equipment operating. This indicates the the load...
will be within the generator load limit.
190
The pulling out (or down) of an illuminated fire handle in a typical large jet aircraft fire protection system commonly accomplishes what events?
Closes fuel shutoff, closes hydraulic shutoff, disconnects the generator field, and arms the fire-extinguishing system.
190
If an aircraft engine is equipped with a carburetor that is not compensated for altitude and temperature variations, the air-fuel mixture will become
richer as either the altitude or temperature increases.