Mechanical Systems and Maintenance Quiz
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Questions and Answers

What document is needed to verify that an item is delivered at the work site?

  • Work order receipt
  • Bill of sale
  • Shipping bill
  • Invoice (correct)

    • At what speed will the Turbine Trip valve activate to protect the turbine?

  • 45%
  • 60% (correct)
  • 30%
  • 90%

    • If a gearbox shaft seal is leaking oil, what should be done?

  • Change the seal of shaft (correct)
  • Use grease instead of oil
  • Add more oil in gear
  • Increase temperature of oil

    • What is the first step to be taken when planning an alignment for rotating machinery?

    <p>Clean the part</p> Signup and view all the answers

    How should excessive clearance between two coupled shafts be addressed if alignment is not required?

    <p>Change coupling</p> Signup and view all the answers

    What action should be taken if a V belt is jumping off the sheave?

    <p>Adjust the alignment or tension on the belt</p> Signup and view all the answers

    Which procedure is correct to start the oxy-acetylene gas cutting?

    <p>Turn on oxygen valve full, turn on 1-1/2 turn of Acetylene valve, Ignite and Adjust</p> Signup and view all the answers

    Which pressure gauge shows zero psi at sea level?

    <p>PSIG</p> Signup and view all the answers

    What is a method to convert a hydraulic system from non-laminar to laminar flow?

    <p>Change fittings</p> Signup and view all the answers

    How can air starvation downstream in a pneumatic grid piping system be addressed?

    <p>Increase pipe diameter</p> Signup and view all the answers

    What is one way a Journey person can confirm that an apprentice understands a task?

    <p>Prepare a checklist for the apprentice</p> Signup and view all the answers

    Which program utilizes past and present data to predict mechanical issues?

    <p>Predictive</p> Signup and view all the answers

    What type of bearing is typically used in a 5Hp electric motor?

    <p>Sealed bearing</p> Signup and view all the answers

    What should be done to protect the key slot when installing a bearing on a shaft without a step key?

    <p>Fill with oil or silica-gel</p> Signup and view all the answers

    What best describes the cavitation process?

    <p>Implosion of vapor bubble</p> Signup and view all the answers

    If the volume in a cylinder at the beginning of the stroke is 6 cubic inches and at the end it is 75 cubic inches, what is the compression ratio?

    <p>1:12.5</p> Signup and view all the answers

    Which of the following seals is a contactless seal?

    <p>Labyrinth seal</p> Signup and view all the answers

    What is the next step after confirming zero energy during the unloading valve change?

    <p>Verify isolation, Prepare the workspace, Remove the old unloading valve, Inspect and clean, Install the new unloading valve, Re-energize and test</p> Signup and view all the answers

    What is the first step to be taken while performing laser alignment?

    <p>Rough alignment</p> Signup and view all the answers

    Which method is considered a Sensory NDT method?

    <p>Vibration, Visual, Noise</p> Signup and view all the answers

    What is the correct process for setting up economical equipment outdoors?

    <p>Clean area, Prepare base, Put equipment, Add barricade to protect people</p> Signup and view all the answers

    Which action increases the flow rate in a hydraulic system?

    <p>Increase pipe diameter</p> Signup and view all the answers

    How should bolts be tightened on a piston head with a torque requirement of 350 lb/ft?

    <p>In star pattern up to 350 lb/ft torque</p> Signup and view all the answers

    What is the procedure for removing a conveyor belt for reuse?

    <p>Loose tension, cut, store at safe place, mark in logbook</p> Signup and view all the answers

    What is the minimum rating of a steel chain used in rigging?

    <p>80%</p> Signup and view all the answers

    Which of the following is used to minimize the lifting angle in a hitch?

    <p>Double basket hitch</p> Signup and view all the answers

    What is the first aspect to check during regular maintenance of a gearbox?

    <p>Visual inspection</p> Signup and view all the answers

    What is used to check the surface of the teeth in a gear?

    <p>Ultrasonic testing</p> Signup and view all the answers

    What steps are involved in the air clutch decommissioning procedure?

    <p>Lockout, depressurize the system, remove cover, clean, replace</p> Signup and view all the answers

    If a centrifugal fan motor is overheating, which action should be taken first?

    <p>Check fan built up</p> Signup and view all the answers

    What is the recommended practice to ensure the life longevity of a sling?

    <p>Clean with solvent</p> Signup and view all the answers

    What should be done first if a leakage occurs?

    <p>Secure the area and stop the leakage</p> Signup and view all the answers

    What is indicated by the '70' in a welding electrode 7018 label?

    <p>Tensile strength in KPA</p> Signup and view all the answers

    What is the weight of a 3x3x3 feet steel block with a 6-inch diameter hole in the middle if 1 cubic feet of steel weighs 480 lb?

    <p>12677 lb</p> Signup and view all the answers

    If too much chromium is found in oil analysis of equipment, what is the likely cause?

    <p>Bearing failure</p> Signup and view all the answers

    What is the correct sequence of steps for performing a laser alignment outside?

    <p>Take wooden tripod, level tripod, mount laser level, clean, do rough alignment</p> Signup and view all the answers

    Which correction should be made to fix a conveyor that moves off-center?

    <p>Correction at idler pulley</p> Signup and view all the answers

    What is a likely cause for a three-phase electric motor to overheat while running?

    <p>Low voltage</p> Signup and view all the answers

    What does the number '2' represent in EP2 type grease?

    <p>Penetration number</p> Signup and view all the answers

    Which unit is commonly used to express velocity?

    <p>Inch/ sec or mm/ sec</p> Signup and view all the answers

    What is the most probable reason for air starvation in an air compressor?

    <p>Clogged air filter</p> Signup and view all the answers

    What could be a reason for material falling off at the unloading point of a conveyor belt?

    <p>Skirt board angle is not proper</p> Signup and view all the answers

    What is the drill bit angle for a twist drill bit?

    <p>118 degrees</p> Signup and view all the answers

    What is the correct procedure to change the pyrometer in a steam turbine?

    <p>Lock out, release steam, replace pyrometer, test, inform supervisor</p> Signup and view all the answers

    If Gear 'A' is the drive gear driving 'B', which is an idler gear connected to 'C', what direction will gear 'C' rotate?

    <p>Against the drive gear</p> Signup and view all the answers

    Which type of oil is specifically used in Hypoid gear applications?

    <p>EP type oil</p> Signup and view all the answers

    What is the appropriate method to support scaffolding on uneven surfaces from the bottom?

    <p>Use wood block shim or wedge</p> Signup and view all the answers

    Study Notes

    MILL 30

    • DOV in figure: 3 Position, 4 Way, Float centre, Manual return.
    • PPE not used with bench grinder: High visibility vest.
    • Correcting horizontal-offset misalignment (fig 2): Move motor from A to B.
    • Steel E rod weight (6 feet length, 4-inch diameter): 514 lb.
    • Overhead structure crane movement: Chain.

    Crane Material Movement

    • Material movement by crane: Boom position and hoist position during material movement (load).
    • Crane boom and hoist position during material movement: Boom up and hoist up.
    • Weight on each sling (fig 3): 9205 lb

    Crane Signals

    • Crane signal (fig 4): Use main hoist.
    • Crane signal (fig 5): Boom up, load down.

    Milling Machine Procedure

    • Milling head squaring procedure: Clean the square mill head, Set the Dial Indicator, Adjust the height of Milling Head, and Tighten the Head Bolts
    • Chemical drum leak procedure: Secure area, stop leakage, transfer material to new drum, refer to SDS, and inform safety panel.
    • Conveyor Belt Length (fig 6): 58 feet.

    Equipment Measurements and Readings

    • Depth micrometre reading (fig 8): 2.182.
    • Oil analysis and chromium reasons: Low oil in the reservoir, bearing failure, worm wear, high oil temp.

    Conveyor Belt Issues

    • Conveyor issues – uneven movement: Correction at tail pully.
    • Drill bit angle: 118 Deg.
    • Prick punch angle: 20-40 Deg.
    • Part width (fig 9): 15-5/8

    Grease Type

    • EP2 grease number 2: Strength number

    Oil Types for Equipment

    • Hypoid gear application oil: Mineral oil.

    Single Choker Hitch Load

    • 3,000 lb basket hitch capacity, damaged, single choker hitch load: 2,100 lb.

    Sling Safety

    • Synthetic web sling usage caution: Water on sling, identification of sling specifications is important
    • Multiple sling safe working load: 720 lb.
    • Oxy-fuel torch cutting procedure: Hold torch tip perpendicular to the cutting piece, then move slowly.

    Vessel Pressure Law

    • Vessel pressure law: Pascal's law.

    Eye Bolt Lift Angle

    • Shouldered type eye bolt minimum lift angle: 25 deg.

    Micrometre calibration

    • Calibration of outside micrometre: Transfer callipers.

    Equipment Maintenance

    • Fluid overheating in the tank: Vent blocked
    • Next step after blueing the worm gear: Check the number of teeth.
    • Shaft Keyway enlargement procedure: Refill (weld), machine and use a woodruff key.

    Equipment Issues and Procedures

    • Air compressor air starvation reasons: Low voltage, Clogged Air Filter, Low Amp.
    • Steam turbine pyrometer change procedure: Inform supervisor, Lock out, Release steam, replace pyrometer, test

    Gear and Material Cutting

    • Gear tooth surface checking method: Dye penetration.
    • Cutting thin gauge materials: Hold torch tip perpendicular to the cutting piece and move slowly
    • Procedure when a shaft keyway is enlarged: Refill, machine and insert a woodruff key

    Various Equipment Aspects

    • Welding electrode label meaning: Tensile strength in PSI.
    • Hydraulic system flow rate increase method: Increase pipe diameter.
    • Steel chain minimum rating: 80%.
    • Bridle hitch sling load calculation: 1,1250 lb.
    • Horizontal chain drive slack: 4% minimum and 5% maximum.
    • Conveyor belt maintenance: Cut, loose tension, store, mark in logbook.
    • Reason for 3000 lb basket capacity change to single choker hitch capacity: 2100-2200 lb single choker hitch capacity.
    • Oil color checking method: UV or optical method

    Equipment Issues

    • Equipment issues due to high fluid temperature: Fluid overheating, improper fluid type.

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    Related Documents

    Mill 30 PDF

    Description

    Test your knowledge on mechanical systems, maintenance procedures, and troubleshooting techniques. This quiz covers topics such as turbine safety, gearbox maintenance, and alignment planning for rotating machinery. Perfect for students and professionals in mechanical engineering or maintenance fields.

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