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127 Cards in this Set
- Front
- Back
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The shape of spur gear teeth is based on an involuted form which produces sliding contact rather than a rolling |
F |
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Double helical gear sets use two pair of opposed gear teeth to eliminate thrust load |
T |
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Which of the following gear design cat does not belong Spur Helical Worm Ground |
Ground |
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In a spur gear term the play between mating teeth |
Backlash |
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In a spur gear term the height of a tooth above a pitch circle is |
Addendum |
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Most enclosed drives are used to |
Reduce speed and increase output torque |
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Worm gear drives are referred to as |
Right angle drives |
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Of the following which gear is the least efficient |
Cylindrical worm |
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What are the eight major factors to consider when selecting gears |
Shaft orientation Speed ratio Design type Nature of load Gear rating Environment Mounting position Lubrication |
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Spur gears produce this type of force when transmitting horsebpower |
Radial |
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Describe where internal gears are typically used |
Planetary gear (sun gear) |
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List 5 cat of gear tooth failure |
Wear Surface fatigue Plastic glow Breakage Process related failures |
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7 types of gearing ( speed reduction) |
Spur Helical Bevel Worm Internal Herringbone Hypoid |
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2 types of lubrication |
Slash Circulation |
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Machine screw jacks have an efficiency of |
25 |
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Ball screw assemblies typically have an efficiency of |
90 |
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Ball screw assemblies typically have an efficiency of |
90 |
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Linear notion bearing types include |
Plain bearings and linear guides |
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Ball screw assemblies typically have an efficiency of |
90 |
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Linear notion bearing types include |
Plain bearings and linear guides |
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Linear motor motion comes from interaction of |
Two or more magnetic fields out of phase with each other |
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Ball screw assemblies typically have an efficiency of |
90 |
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Linear notion bearing types include |
Plain bearings and linear guides |
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Linear motor motion comes from interaction of |
Two or more magnetic fields out of phase with each other |
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List four methods used to establish preload in a ball screw |
Double nut Double nut spring Offset lead Oversize ball |
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Electric motors operate in the principle that a force acts on a conductor when it carries current in a mag field |
T |
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Ac motors typically operate directly on ac power lines |
T |
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Ac motors typically operate directly on ac power lines |
T |
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Ac motors contain main parts the Stator and the rotor |
T |
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Ac motors typically operate directly on ac power lines |
T |
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Ac motors contain main parts the Stator and the rotor |
T |
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Ac motors contain windings with 2 or more mag poles per phase |
T |
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The rotational speed of the statues man field is called the synchronous speed of the moto |
T |
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The rotational speed of the statues man field is called the synchronous speed of the moto |
T |
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Locked rotor torque is that torque available at zero speed for accelerating the load |
T |
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Dc motors are less complex and costly and ac induction |
F |
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These are two basic types of dc motors brush and brushless |
T |
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These are two basic types of dc motors brush and brushless |
T |
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Three types of wound field dc motors include series shunt and compound wound |
T |
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Brushless motors have neither commutators nor brushes |
T |
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Step motors are used for their high speed and high torque |
F |
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Step motors are used for their high speed and high torque |
F |
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Step motors exhibit different speed torque characteristics than other types |
T |
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Step motors are used for their high speed and high torque |
F |
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Step motors exhibit different speed torque characteristics than other types |
T |
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Another name for a 3 phase motor is |
Polyphase |
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Step motors are used for their high speed and high torque |
F |
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Step motors exhibit different speed torque characteristics than other types |
T |
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Another name for a 3 phase motor is |
Polyphase |
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Doubling motor load |
Raises motor hearing four times |
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Pm motors are offered in sizes from |
1/4 to 5 hp |
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Pm motors are offered in sizes from |
1/4 to 5 hp |
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A typical dc motor option is a |
Tachometer |
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What does 1.15 sf mean on a motor name plate |
Service factor 11.5 hp |
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What does 1.15 sf mean on a motor name plate |
Service factor 11.5 hp |
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When matching performance what does a s t curve define |
Speed torque
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List eight motor selection considerations |
Hp Rpm Voltage Enclosure Frame Starting torque Load characteristics Duty cycle |
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List eight motor selection considerations |
Hp Rpm Voltage Enclosure Frame Starting torque Load characteristics Duty cycle |
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Electricity the simplest adjustable speed drives are |
Eddy current |
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List eight motor selection considerations |
Hp Rpm Voltage Enclosure Frame Starting torque Load characteristics Duty cycle |
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Electricity the simplest adjustable speed drives are |
Eddy current |
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3 reasons to use adjustable speed drives |
More convenient Slow initial start up speed Several operating speeds |
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Inner space includes the clearence that exits between mates parts |
T |
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Inner space includes the clearence that exits between mates parts |
T |
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Some failures of mechanical parts are due to the clearence between fitted parts |
T |
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Inner space includes the clearence that exits between mates parts |
T |
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Some failures of mechanical parts are due to the clearence between fitted parts |
T |
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A aerobics require air to cure |
F |
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Inner space includes the clearence that exits between mates parts |
T |
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Some failures of mechanical parts are due to the clearence between fitted parts |
T |
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A aerobics require air to cure |
F |
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All thread lockers are permanent adhesives |
F |
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Inner space includes the clearence that exits between mates parts |
T |
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Some failures of mechanical parts are due to the clearence between fitted parts |
T |
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A aerobics require air to cure |
F |
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All thread lockers are permanent adhesives |
F |
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Ptfe tape may damage hydraulic systems |
T |
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One of the oldest methods of dealing includes |
Non curing pipe compound |
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Liquid thread lockers are |
One component adhesives |
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A disadvantage of anaerobic sealant is |
They are not suitable for oxygen sealing |
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Seals are used on rotating shafts to retain lubricant and exclude foreign material |
T |
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Seals are used on rotating shafts to retain lubricant and exclude foreign material |
T |
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Lip seals work best with steel of stainless steel shafts |
T |
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Fluorocarbon seal materials exhibit excellent chemical characteristics |
F |
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Belts and chains do not need specified tensions for optimum life |
F |
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Belt manufacturers generally encourage use of tensioners |
T |
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Another name for the qd bushing is a quick disconnect bushing |
T |
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Keyless locking devices eliminate backlash that is sometimes encountered with keyed connections |
T |
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Which of the following characteristics will optimize deal performance Shaft hardened to 30 c Chamfer or radius on shaft edges Shaft finish of 10 to 20 micro inch All of the above |
All |
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Most widely used shaft seal material |
Nitrile rubber |
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Most widely used shaft seal material |
Nitrile rubber |
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Which of the following is not a basic type of drive tensioner Self adjusting Adjustable Fixed Unfixed |
Un |
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Retaining rings are sometimes called |
Snap rings |
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Keyless locking devices allow which of the following Components to be easily removed Comp to be easily replaced Mounts to shaft more securely than keyways All |
All |
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Keyless locking devices allow which of the following Components to be easily removed Comp to be easily replaced Mounts to shaft more securely than keyways All |
All |
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To retain a part on a shaft shaft collars act as a Separator Stop location device Weldment All |
All |
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Keyless locking devices allow which of the following Components to be easily removed Comp to be easily replaced Mounts to shaft more securely than keyways All |
All |
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To retain a part on a shaft shaft collars act as a Separator Stop location device Weldment All |
All |
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Between the shaft and mating part key stock and keys act as a |
Torque transmitter |
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Locknuts are used for Adjusting clearance in a bearing Preloading a bearing Locking a bearing or component onto a shaft All |
All |
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Locknuts are used for Adjusting clearance in a bearing Preloading a bearing Locking a bearing or component onto a shaft All |
All |
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When oil is being retained by a seal what component must the seal have to ensure adequate sealing force |
Sprint loaded seal |
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Locknuts are used for Adjusting clearance in a bearing Preloading a bearing Locking a bearing or component onto a shaft All |
All |
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When oil is being retained by a seal what component must the seal have to ensure adequate sealing force |
Sprint loaded seal |
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Taper bushings use what type of action to clamp the bushing to the shaft |
Wedge |
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Name four types of shapes of keys or keystock |
Square Rectangle Offset Woodruff |
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Cooking and debris removal are unimportant functions of lubricant |
T |
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The primary function of lubrication is to reduce friction between two solid surfaces |
T |
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The primary function of lubrication is to reduce friction between two solid surfaces |
T |
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Increase friction causes increased wear |
Tv |
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The primary function of lubrication is to reduce friction between two solid surfaces |
T |
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Increase friction causes increased wear |
Tv |
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Energy loss is a result of high levels of friction |
T |
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Some form of lubrivation is used in almost all mechanical devices |
Tv |
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Viscosity is the most important property of a lubricant |
F |
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The lubricant viscosity is not affected by temperature |
F |
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Lubrivation regimes are determined by the thickness of the fluid film |
T |
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Lubrivation regimes are determined by the thickness of the fluid film |
T |
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Load and speed of the surfaces do not contribute to determining the lubrication regime |
F |
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Non soap grease include Polyurea Lithium Calcium Aluminum |
Poly |
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Number one cause of oil failure |
Contamination |
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Which of the following does not represent one of the there cs of lubrication storage Avoid contamination Prevent confusion Prevent consolidation Provide containment |
Consolidation |
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One of the most common gelling agents used in grease is |
Lithium |
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The tiny peaks that are in contact of the marine surfaces are called |
Asperetis |
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When will machinery components encounter boundary lubrication conditions |
Start up and shut down |
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What 3 issues cause oil to degrade |
Contamination Depletion of additives in the oil Direct degradation of the base oil |
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What sized particles do we most want to eliminate through filtration process |
The same size as the dynamic clearences |
