NIFE ENGINES EXAM CERTIFICATION
QUESTIONS WITH COMPLETE
SOLUTIONS
Screech Liner - Answer-Perforated sleeves installed in the duct to reduce pressure
fluctuations and vibrations by acting as a form of shock absorber.
Variable-Exhaust Nozzle - Answer-"Turkey Feathers" is the iris arrangement of thin
metal plates to allow the nozzle to open during afterburner use and close for basic
subsonic operation. (prevents back pressure and engine stalls)
7 Parts of Reciprocating Engine - Answer-4Cs, 2Ps, 2Vs
Crankcase
Cylinders
Connecting Rods
Crankshaft
Pistons
Plugs (spark)
Valves
Valve-operating mechanism
TSFC - Answer-Thrust Specific Fuel Consumption - Amount of fuel required to produce
one pound of thrust
Turbo Comparison Chart - Answer-Be able to draw it
Turbo Jet - Answer-Pros: Lightest Specific weight (weight per pound of thrust
produced), higher and faster than any other engine
Cons: Low propulsive efficiency at low forward speeds, relatively high TSFC at low alt
and low airspeeds, long takeoff roll required
Turbo Fan - Answer-Pros: Higher thrust at low airspeeds, lower TSFC, shorter takeoff
distance, noise reduction
Cons: Higher specific weight, larger frontal area, inefficient at higher altitudes
Turbo Prop - Answer-Pros: high thrust at low airspeeds; excellent take-off, slow speed,
and low altitude characteristics; superior for lifting heavy loads off short and medium
length runways
Cons: Heavier and more complicated, limited speeds
, Turbo Shaft - Answer-Delivers power through a shaft to drive something other than a
propeller. By definition, it will ALWAYS HAVE A FREE/POWER TURBINE
Free Power Turbine - Answer-A turbine not linked to a compressor and devots all its
energy to spinning the shaft.
Propeller Assembly - Answer-pitch change/dome assembly
blade assembly
hub assembly
RGB - Answer-The Reduction Gear Box converts high RPM and low torque into low
RPM and high torque to prevent supersonic blade speeds
Torquemeter Assembly - Answer-ALWAYS BETWEEN THE GAS GENERATOR AND
RGB.
Recirpracating (Otto Cycle) Engine - Answer-Propeller can be attached directly to the
crankshaft or through an RGB.
Alpha vs Beta Range - Answer-Alpha range is from idle to full power. (flight range)
Beta range is from idle to reverse. (PCL mechanically connected to FCU) (ground
range)
Pascals Law - Answer-Pressure applied to a confined liquid is transmitted equally in all
directions without the loss of pressure and acts with equal force on equal surfaces.
Force v Linear Displacement - Answer-Linear displacement is INVERSELY proportional
to the multiplied force. (more force means you have to move the input a lot to move the
output a little)
Hydraulic System Purpose - Answer-Main purpose of hydraulic system is to MULTIPLY
FORCE.
Hydraulic Power Systems - Answer-Power Control System- flight controls only
Utility Control System- utility systems as well as flight controls
Hydraulic Resevoir - Answer-(Pressurized and non-pressurized)
S- storage
H- heat dissipation
A- aeration (remove bubbles)
F- FOD trap
T- thermal expansion
QUESTIONS WITH COMPLETE
SOLUTIONS
Screech Liner - Answer-Perforated sleeves installed in the duct to reduce pressure
fluctuations and vibrations by acting as a form of shock absorber.
Variable-Exhaust Nozzle - Answer-"Turkey Feathers" is the iris arrangement of thin
metal plates to allow the nozzle to open during afterburner use and close for basic
subsonic operation. (prevents back pressure and engine stalls)
7 Parts of Reciprocating Engine - Answer-4Cs, 2Ps, 2Vs
Crankcase
Cylinders
Connecting Rods
Crankshaft
Pistons
Plugs (spark)
Valves
Valve-operating mechanism
TSFC - Answer-Thrust Specific Fuel Consumption - Amount of fuel required to produce
one pound of thrust
Turbo Comparison Chart - Answer-Be able to draw it
Turbo Jet - Answer-Pros: Lightest Specific weight (weight per pound of thrust
produced), higher and faster than any other engine
Cons: Low propulsive efficiency at low forward speeds, relatively high TSFC at low alt
and low airspeeds, long takeoff roll required
Turbo Fan - Answer-Pros: Higher thrust at low airspeeds, lower TSFC, shorter takeoff
distance, noise reduction
Cons: Higher specific weight, larger frontal area, inefficient at higher altitudes
Turbo Prop - Answer-Pros: high thrust at low airspeeds; excellent take-off, slow speed,
and low altitude characteristics; superior for lifting heavy loads off short and medium
length runways
Cons: Heavier and more complicated, limited speeds
, Turbo Shaft - Answer-Delivers power through a shaft to drive something other than a
propeller. By definition, it will ALWAYS HAVE A FREE/POWER TURBINE
Free Power Turbine - Answer-A turbine not linked to a compressor and devots all its
energy to spinning the shaft.
Propeller Assembly - Answer-pitch change/dome assembly
blade assembly
hub assembly
RGB - Answer-The Reduction Gear Box converts high RPM and low torque into low
RPM and high torque to prevent supersonic blade speeds
Torquemeter Assembly - Answer-ALWAYS BETWEEN THE GAS GENERATOR AND
RGB.
Recirpracating (Otto Cycle) Engine - Answer-Propeller can be attached directly to the
crankshaft or through an RGB.
Alpha vs Beta Range - Answer-Alpha range is from idle to full power. (flight range)
Beta range is from idle to reverse. (PCL mechanically connected to FCU) (ground
range)
Pascals Law - Answer-Pressure applied to a confined liquid is transmitted equally in all
directions without the loss of pressure and acts with equal force on equal surfaces.
Force v Linear Displacement - Answer-Linear displacement is INVERSELY proportional
to the multiplied force. (more force means you have to move the input a lot to move the
output a little)
Hydraulic System Purpose - Answer-Main purpose of hydraulic system is to MULTIPLY
FORCE.
Hydraulic Power Systems - Answer-Power Control System- flight controls only
Utility Control System- utility systems as well as flight controls
Hydraulic Resevoir - Answer-(Pressurized and non-pressurized)
S- storage
H- heat dissipation
A- aeration (remove bubbles)
F- FOD trap
T- thermal expansion
