Millwright Alberta Period 3 FINAL EXAM STUDY GUIDE 2025/2026 COMPLETE QUESTIONS BANK AND CORRECT DETAILED ANSWERS WITH RATIONALES || 100% GUARANTEED PASS <LATEST VERSION>

Millwright Alberta Period 3 FINAL EXAM STUDY GUIDE 2025/2026 COMPLETE QUESTIONS BANK AND CORRECT DETAILED ANSWERS WITH RATIONALES || 100% GUARANTEED PASS &lt;LATEST VERSION&gt; 1. What are the 2 main categories of screw compressor - ANSWER Oil wet and oil free dry screw comp 2. Witch rotor is the driver on a screw compressor - ANSWER The male rotor 3. What determines the capacity of a screw compressor - ANSWER Rotor length, diameter, lobe flute design and speed 4. What determines the discharge pressure of a screw compressor - ANSWER The location of the inlet port along the rotor, the length of path and the discharge port location 5. What function does the oil in a wet screw compressor serve - ANSWER Remove heat, seal gaps to prevent leakage, lubricate and reduce noise 6. What is the simplest type of control system in a screw compressor - ANSWER Online/offline control 7. Which control system allows the compressor to produce only the amount of air required - ANSWER Modulation control 8. What must be included to prevent rotor contact on a dry screw compressor - ANSWER Timing gears need to be used 9. What is stonewalling - ANSWER Is the point across the compressor curve where maximum flow has been reached. Pressure increases as gas flow through the compressor decreases 10. What is the principle involved with designing a vane C system without a receiver - ANSWER The air pressure being produced inside the casing is used to control the position of the inlet unloader valve, which matches compressor output to system requirements 11. On a wet vain compressor, what part gets rid of the majority of the oil as soon as it passes through the discharge port on the stator - ANSWER The labyrinth seal 12. Which valve on a wet vane serves the purpose of ensuring that the oil circulation system is satisfied first, before the compressor sends any air to the system - ANSWER The minimum pressure valve located on the compressor discharge 13. Under what conditions does the minimum pressure valve remain open - ANSWER As long as the pressure stays above 60psi, valve will stay open 14. How is the reverse flow of air, along with condensed water vapour and other contaminants, prevented from entering the compressor - ANSWER The check valve portion of the minimum pressure valve slams shut or on larger compressors, there is a check valve in the discharge line 15. On the wet vain, which valve is normally open on start up and which is normally closed - ANSWER Unloader valve is normally open and the servo valve is normally closed 16. Why must you have a good seal on the vanes while they rotate and compress air - ANSWER As compression is occurring, each blade is at a higher pressure so the air is always trying to leak back toward the suction 17. Within wet vane compressor,why must you remove the oil vapour while the air/oil mixture is still quite warm - ANSWER If moisture in the air were allowed to cool too much, the water vapour could condense and contaminate the oil 18. What is the purpose of the oil relief valve - ANSWER To prevent hydraulic lock or over pressure and breakage 19. What is the purpose of the oil bypass valve on a compressor system - ANSWER It stops the oil from going to the cooler and warms it up quicker to get it to the proper temp for efficient lubrication 20. Why does a safety relief valve need to be installed on the casing of the wet vane compressor - ANSWER If the minimum pressure valve were to seize in the shut position it labyrinth passages were to get blocked off, the compressor could blow itself alart 21. TIR - ANSWER Total Indicator Reading 22. Positive Displacment vs. Centrifugal Pump - ANSWER Capacity is constant reguardless of pressure Flow does not decrease with increasing viscosity 23. Centrifugal Pump - ANSWER Capacity decrease with increase in pressure Flow rate decrease with viscosity 24. 2 categories of postive displacment pumps - ANSWER Reciprocals and Rotary 25. 2 types of pistons - ANSWER Single action and Double action 26. Similar to piston - ANSWER pumping element iscylindrical solid move back and forth in a cylindrical chamber. 27. Difference to piston - ANSWER plunger moves into and withdrawls from the cylindrical chamber. 28. Diaphragm Pump 3 types of operations - ANSWER Mechanical linkage, compressed air, and fluid from a pulsating, external force. 29. What are the two main types of gravity roller conveyor? - ANSWER Standard gravity roller conveyors and skate wheel conveyors 30. What are three frame styles available for skate wheel conveyors? - ANSWER Plain skids, skids with built-in guards, and wheel skid conveyors 31. What are two frame styles available for roller conveyors? - ANSWER High mounted and low mounted 32. What are two categories of roller conveyors? - ANSWER Gravity roller conveyors and live roller conveyors 33. What is the frame that supports the rollers on a roller conveyor called? - ANSWER The roll case 34. What are gravity roller conveyor rollers typically constructed out of? - ANSWER Steel tubing 35. What is the width of the roller conveyor determined by? - ANSWER The width of the largest package to be carried on it. 36. For roller conveyors, what is the smallest number of rollers that should be under the smallest container at any time? - ANSWER Three 37. For skate wheel conveyors, what is the smallest number of wheels that should be under the smallest package at any given time? - ANSWER Five 38. All elevator installations require some form of ________ ____ device. - ANSWER Take up device 39. What are the four roller configurations used in curved sections? List them in order from best at turning the load to worst. - ANSWER Tapered roller curve, staggered double lane roller curve, double lane in-line roller curve, and straight roll curved conveyor. 40. What is the conveyor pitch? - ANSWER The amount of drop per unit length a conveyor requires in order to carry the given load. Typical pitches vary from a quarter inch per foot to a half inch per foot. 41. What are some factors that would affect the amount of pitch required for a gravity roller conveyor? - ANSWER Weight of the package (heavier needs less pitch) Smoothness of the bottom of the package (smoother needs less pitch) Firmness of the bottom of the package (harder needs less pitch) Number of rollers under the package Total length of the conveyor Type of bearings Type of rolls Size of rolls Operating conditions 42. How can you tell the hand of a roller conveyor? - ANSWER Use the direction of flow as a reference, if the conveyor turns to the left it is left handed. 43. What are live roller conveyors typically driven by? - ANSWER Electric motors and gearboxes Electric gear motors Hydraulic motors Hydraulic motors coupled to gearboxes 44. By what means do motors transfer power to a live roller conveyor? - ANSWER Flat belts, V belts, round belts, chains, and direct drive. 45. What part of the V-belt drives the rollers on a V-belt driven live conveyor? - ANSWER When V belts are used to drive rollers, the top of the belt is pressed against the roller. 46. What are the three standard sheaves used when driving around curves on a roller conveyor? - ANSWER Drive sheave Take up sheave Tail sheave 47. What is the main difference between a gravity or belt driven roller and a gear driven roller? - ANSWER On a gravity or belt driven roller, the shaft does not turn, the outer bearing race turns. On a chain driven roller, the shaft turns and is locked to the roller, turning the roller that is turning on the inner race of the bearing. 48. Why does a continuous chain roller system need a hold down plate? - ANSWER To keep the chain in contact with the sprockets. 49. What are the two main drive configurations on a chain drive? - ANSWER The continuous chain drive, and the roll to roll drive. 50. List 4 types of rolls on a roll to roll drive conveyor. - ANSWER Eccentric rolls Bottle rolls Spiral rolls Angled rolls 51. What is the spur when referring to a roller conveyor? - ANSWER Spurs are roller or wheel conveyors used to transfer loads off of or on to belt or roller conveyors. 52. What device maybe used to direct a package from the main conveyor to a spur? - ANSWER A deflector. 53. What are jump rolls? - ANSWER They are used to transfer packages across side transfer chains. If the rolls are lowered, the transfer chains carry the package away. If the rolls are raised, the rolls carry the package across the chains and onto the next conveyor. 54. What are two methods to raise and lower a stop plate? - ANSWER Cylinder operated pivoting stop plate Airbag operated sliding stop plate 55. What are some commonly used overload devices used to prevent drive system damage on roll conveyors? - ANSWER Shear pin Torque limiting clutch Ball and detent overload Hydraulic relief valve limiter A torque arm An electric motor overload in the motor starter A fluid coupling fusible plug Loose belts that slip if overloading of the conveyor takes place Zero speed switch at the tail end so that the driver stops if the conveyor jams 56. What are the two systems that pneumatic conveyors operate on? - ANSWER Negative pressure and positive pressure systems 57. When are vacuum conveying systems primarily used? - ANSWER When material must be conveyed from more than one location to a single location. 58. What type of compressors do you positive pressure systems require on a pneumatic conveyor? - ANSWER Positive pressure systems that require air at a predetermined pressure are usually supplied by positive displacement compressors. Low pressure systems can use dynamic compressors. 59. What are low pressure pneumatic conveyor systems usually driven by and to what pressures? - ANSWER Lobe or roots type blowers. The system is usually limited to about 12 psig. 60. What are medium pressure pneumatic conveyor systems usually driven by and to what pressures? - ANSWER Rotary blowers or sliding vane compressors, depending on the pressure required. Medium pressure conveyors generally operate with air pressures ranging from 15 psig to 45 psig. 61. What are high-pressure pneumatic conveyor systems usually driven by and to what pressures? - ANSWER High pressure systems are usually driven by plant air that has been cleaned of oil and sent through a dryer to remove any moisture. High-pressure systems operate up to 125 psig. 62. What is a rotary feeder used for? - ANSWER A rotary feeder is used to ensure material is able to enter the airstream in the pneumatic conveyor. 63. What is a control gate in a pneumatic conveyor? - ANSWER They are a means of controlling or directing material flow. Gates have one or more discharge spouts and may be manually or remotely operated. 64. What is an isolation or blanking gate? - ANSWER They're used when work is to be performed inside a hopper or silo. These gates must be locked or chained in the closed position in order to prevent accidental flow of materials into the confined space.