# Shared Flashcard Set

AIT
58
Other
04/24/2013

## Additional Other Flashcards

Term
 Driver,Prime mover
Definition
 A mechanical power transmission system receives power from.
Term
 Allow two shafts to be disconnected while running.
Definition
 The purpose of having a clutch connecting two shafts together is to
Term
 The groove in a shaft for a key is called a ______________?
Definition
 keyseat
Term
 A woodruff key has a _______________?
Definition
 half moon
Term
 The nominal height of a key is the height of the key-stock without accounting for_____________?
Definition
 tolerance
Term
 The best instrument to use when measuring the inside width of a key-seat or the depth of the key-seat is a_____________?
Definition
 dial caliper
Term
 _____________ set screws are used for permanent mounting of components on shafts.The point bites into the shaft to create a high axial and torsional locking strength.
Definition
 Cone point
Term
 When assembling a key in a shaft key-seat, the key____________________?
Definition
 should fit into the key-seat without forcing it.
Term
 The best way to remove a hub from a shaft is to________________?
Definition
 use a bearing puller.
Term
 Two common methods used to load a mechanical drive system are using a dynamo meter, or a __________________?
Definition
 prony brake
Term
 The power output at a motors shaft if found by ____________________?
Definition
 multiplying the torque times the shaft speed
Term
 A motor shaft producing 4 ft-lb torque at 1313 RPM has __________________Hp?
Definition
 Use the formula: P out= TxS/5252 1
Term
 A ____________ ammeter is opened and placed around the wire to measure the current, which is convenient because the user does not have to disconnect the circuit.
Definition
 clamp- on
Term
 Mechanical Power Efficiency is defined as _____________?
Definition
 the ratio of the Power out to the Power in
Term
 As the torque on an electric motor increases, ______________?
Definition
 current increases
Term
 The function of a machine shaft is to __________________.
Definition
 transmit mechanical power from one location to another
Term
 A common material used in machine shafts is____________________
Definition
 cold rolled steel
Term
 Chrome plated steel shafts should be used ________________.
Definition
 to resist rusting or corrosion
Term
 The accuracy stock diameter of a shaft is ______ the nominal diameter.
Definition
 always less than
Term
 The three types of loads placed of bearing are __________________
Definition
 radial, thrust, and combination
Term
 Without bearings to hold a shaft in place, loads would cause _______________
Definition
 all the above excessive wear/ the shaft to move out of placethe machine to fail
Term
 All electric motors require ______ bearings mounted _____to the motor
Definition
 two ; internally
Term
 The two major categories of bearings used in industry are
Definition
 plain and ani-friction
Term
 Both major categories of shaft bearings can be mounted in one of which tow ways?
Definition
 Pillow block and flange
Term
 The coupling provides a secure method of transmitting____________ from one shaft to another.
Definition
 torque and speed
Term
 The flange coupling is classified as which type of mechanical coupling?
Definition
 Rigid
Term
 The advantage of the flexible jaw coupling is ________________.
Definition
 allows more misalignment
Term
 The tow major types of misalignment corrected by shaft alignment are____________
Definition
 angular and parallel
Term
 The procedure of aligning two shafts is to check and correct ___________and __________misalignment in two planes; vertical and horizontal.
Definition
 angular; parallel
Term
 When aligning tow shafts, the reason to rotate the coupling hubs before making each measurement is so each measurement is ____________
Definition
 taken from the place on the hub each time
Term
 Pulley Ratio is defined as the ratio of ___________
Definition
 pitch diameter of the driven pulley to the pitch diameter of the drive pulley
Term
 The pitch circle of a belt drive is _____________.
Definition
 the place in the belt which represents the center of the force that is being transmitted by the belt.
Term
 The three basic components for a belt drive system are ____________.
Definition
 v-belt, driver sheave, and driven sheave
Term
 In a belt drive system, as the pulley ratio increases, shaft speed on the driven pulley will ___________ and shaft torque will _______________.
Definition
 decrease ; increase
Term
 One important characteristic of a timing belt is that it _________________.
Definition
 will not slip during operation
Term
 A Fractional Horsepower (FHP) V-Belt is used for _____________.
Definition
 low power, intermittent operation
Term
 In the process of installing a chain drive system, the motor and driven component should be checked for a soft foot condition and excessive run-out. The shaft run-out should be no more than ________________.
Definition
 0.002 inch
Term
 A used belt requires _________ belt deflection force that a new belt.
Definition
 less
Term
 Pitch is defined as the distance between a point and a similar corresponding point. Examples of pitch are__________________.
Definition
 All of the above
Term
 The maximum allowable deflection force on a belt is ______________ than the minimum deflection force.
Definition
 50% greater
Term
 Belt span is defined as the _______________.
Definition
 distance between the points on the sheaves where the belt touches each sheave.
Term
 A V-belt should ride _________ in the groove with its top near the top of the sheave, and does not touch the _________of the sheave.
Definition
 high; bottom
Term
 The most basic way to test the tension of a belt is to use
Definition
 your sense of touch
Term
 the three basic components of a chain drive are ___________.
Definition
 chain, driver sprocket, and driven sprocket
Term
 In a chain drive system, the speed and torque of the driven shaft are determined by the _______________.
Definition
 relative number of teeth between the driven sprocket and the driver sprocket
Term
 The sprocket ratio for a chain drive system having a driven sprocket with 54 teeth and a driver sprocket with 18 teeth is ______________
Definition
 3
Term
 In a chain drive system, the speed of the driven shaft will decrease as the ____increases.
Definition
 sprocket ratio ( SR )
Term
 In a chain drive systme, the _________on the driven shaft will increase as the sprocket ratio (SR) increases.
Definition
 torque
Term
 A chain drive system has a driver sprocket with 24 teeth and a driven sprocket with 72 teeth. If the driver shaft speed id 600 RPM, the driven shaft speed will be _____________.
Definition
 1899 ft-lbs
Term
 The most common type of chain used for mechanical drive is a ________.
Definition
 roller chain
Term
 A chain should be replaced when its length become __________ longer that the original length
Definition
 3%
Term
 Multiple strand chains are used __________.
Definition
 to transmit a great deal of power
Term
 Compared to a v-belt drive, a chain drive ________________.
Definition
 is more efficient
Term
 Chain sag is measured by rotating the sprockets so there is little or no chain sag in the __________ side and measuring the dag in the ___________ side
Definition
 taut; slack
Term
 Chain sag is measured
Definition
 midway between the sprockets
Term
 to install a chain, in some applications ______________.
Definition
 all the above
Term
 A chain puller is a tool used to hold two ends of a chain together while the _____________.
Definition
 master link is installed
Term
 When using a chain puller, the jaws are opened and closed by _______________.
Definition
 A dial on top of the tool
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