Millwright Period 4 Exam Results Questions
With Verified Answers Graded A+
Engine Block Rejection
Most common reason: cracks after cleaning and inspection.
Steam Turbine Class
Rated up to 700 psig and 399°C: class 3 turbine.
Gas Turbine Seals
Used on compressor and turbine: labyrinth seals.
Electronic Overspeed Trips
Typically used on turbines above 10,000 rpm.
Zener Diode Excess Voltage
On low-tension magneto: shorted to ground.
Pickling of Steel Piping
Process: running an acid bath through the piping.
Room Venting
Air intake: high location, outlet: low location.
Gas Turbine Speed Conditions
Single shaft category: NOT suitable for variable speed.
Intake Manifold Pressure Sensors
Indicate engine load for millwrights.
Ring Expander Usage
Used to install compression rings on engine pistons.
Cylinder Liner Cracking
Caused by overheating, hot spots, piston seizure.
Low Frequency Instability
Governor issue caused by fuel pressure variations, worn control valve.
Crankshaft Deflection
Can cause bearing overheating, inaccurate alignment, short coupling life.
Heavier Fuels in Gas Turbine
Necessitate longer flame tubes for installation.
, Coolant Selection Caution
Propylene glycol-based coolants can swell plastics at high temperatures.
Valve Cover Breather
Indicates positive crankshaft ventilation in the engine.
Diesel Engine Governor Drive
Driven by gear or belt from crankshaft or camshaft.
Basic Governor Function
Designed to operate the throttle valve on a prime mover.
Governor Speed Change
Amount of change from no load to full load: speed droop.
Bore Diameter vs. Stroke Length
Smaller bore diameter than stroke length: under square engine.
Theoretical Engine Power
Theoretical power of an engine: indicated horsepower.
Carburetor Function
Function: mix atomized fuel with air in proper ratio.
Turbine Seal Tightening
Ends of casing kept tight by being spring loaded.
Gas Turbine Efficiency Reduction
Caused by contaminants, blade erosion, fuel vaporization issues.
Engine Installation Care
Ensure enough overhead room for ventilation during installation.
Air Filter Type
Type that throws dirt particles outward: pre-cleaner.
Carburetor Low-Pressure Area
Created by the venturi in the carburetor.
Variable Speed Governor
Uses centrifugal flyweights for adjustments based on force changes.
With Verified Answers Graded A+
Engine Block Rejection
Most common reason: cracks after cleaning and inspection.
Steam Turbine Class
Rated up to 700 psig and 399°C: class 3 turbine.
Gas Turbine Seals
Used on compressor and turbine: labyrinth seals.
Electronic Overspeed Trips
Typically used on turbines above 10,000 rpm.
Zener Diode Excess Voltage
On low-tension magneto: shorted to ground.
Pickling of Steel Piping
Process: running an acid bath through the piping.
Room Venting
Air intake: high location, outlet: low location.
Gas Turbine Speed Conditions
Single shaft category: NOT suitable for variable speed.
Intake Manifold Pressure Sensors
Indicate engine load for millwrights.
Ring Expander Usage
Used to install compression rings on engine pistons.
Cylinder Liner Cracking
Caused by overheating, hot spots, piston seizure.
Low Frequency Instability
Governor issue caused by fuel pressure variations, worn control valve.
Crankshaft Deflection
Can cause bearing overheating, inaccurate alignment, short coupling life.
Heavier Fuels in Gas Turbine
Necessitate longer flame tubes for installation.
, Coolant Selection Caution
Propylene glycol-based coolants can swell plastics at high temperatures.
Valve Cover Breather
Indicates positive crankshaft ventilation in the engine.
Diesel Engine Governor Drive
Driven by gear or belt from crankshaft or camshaft.
Basic Governor Function
Designed to operate the throttle valve on a prime mover.
Governor Speed Change
Amount of change from no load to full load: speed droop.
Bore Diameter vs. Stroke Length
Smaller bore diameter than stroke length: under square engine.
Theoretical Engine Power
Theoretical power of an engine: indicated horsepower.
Carburetor Function
Function: mix atomized fuel with air in proper ratio.
Turbine Seal Tightening
Ends of casing kept tight by being spring loaded.
Gas Turbine Efficiency Reduction
Caused by contaminants, blade erosion, fuel vaporization issues.
Engine Installation Care
Ensure enough overhead room for ventilation during installation.
Air Filter Type
Type that throws dirt particles outward: pre-cleaner.
Carburetor Low-Pressure Area
Created by the venturi in the carburetor.
Variable Speed Governor
Uses centrifugal flyweights for adjustments based on force changes.
