3-63.Rocker arms are a variation ofwhich of the following parts?1.The clevis2.The lever3.The turn buckle4.The coupling3-64.The counterbalance weights on theclamps of a sleeve coupling serveto1.increase speed2.decrease shaft vibration3.transmit motion from a linkmoving in one direction to alink moving in a differentdirection4.change rotary motion to linearmotion3–65.The coil spring in an Oldhamcoupling serves to1.reduce friction between thecoupling disks2. keep the coupling disks inplace3.make allowance for changes inshaft length4.strengthen the coupling3-66.What device is used to couple twoshafts that meet at a 15° angle?1.Sleeve coupling2.Hooke joint3.Oldham coupling4.Flexible coupling3–67.The amount of whip in shaftscoupled by a Hooke joint depends onthe1.strength of the joint2.number of degrees the shaftsare out of line3.difference in the lengths ofthe shafts4.combined weight of the shaftsand the joint3–68.The fixed, flexible, and Oldhamcouplings have a common use, whichis to connect rotating shafts thatare1.perfectly aligned2.misaligned by more than 25°3.slightly misaligned4.severely stressed3–69.What advantage does a vernier–typecoupling have over a sliding lugcoupling?1.Simplicity of operation2.Strength3.Flexibility4.Accuracy of adjustment3–70.Cams are generally used for all ofthe following purposes EXCEPT1.transmitting power2.changing the direction ofmotion from up and down torotary3.controlling mechanical units4.synchronizing two or moreengaging units3–71.When the valve of figure 3E is notbeing lifted by the cam lobe, thecam roller is held in contact withthe edge of the cam by the1.speed of the camshaft2.spring as it shortens3.weight of the valve4.spring as it lengthens3–72.A function of the clutch in thedrive mechanism of a power boat isto1.permit changes in gear ratio2.disconnect the engine from thepropeller shaft3.reverse the pitch of thepropeller4.reverse the direction of theengine rotation31
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