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IET 450_ FEA Written Exam (1).
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IET 450_ FEA Written Exam (1).
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IET 450- Midterm Part 26 Types of Cams - correct answer-Plate or Disc Cam, Translating or Wedge Cam, Cylindrical
Cam, Conical Cam, Face Cam, and Globonical Cam
How many types of cams are there? - correct answer-6
Two types of cam-follower motions? - correct answer-Translating
Oscillating
3 Types of contacts of translating follower? - correct answer-Radial, In-line, and Offset
Name Three types of contacts of oscillating follower? - correct answer-Flat-face, Roller, and
Cylindrical/Spherical-face
Characteristics of constant velocity? - correct answer-Uniform-velocity profile, Straight-line
profile,
Straight line from
zero to end of the rise.
Disadvantages of constant velocity? - correct answer-Infinity acceleration at the beginning
and end,
Consequent large inertia forces at these points,
Inadequate in application of moderate to high velocity,
Result in vibration,noise,high stress level,and wear
Characteristics of modified constant velocity? - correct answer-Avoid infinite acceleration
beginning and end of rise,
Smaller R derives undesirable velocity changes, Bigger R derives gradual
acceleration but higher, velocity during midsections
Disadvantages of modified constant velocity? - correct answer-Not constant velocity
anymore,
Derivative of acceleration (Jerk) is infinite,
Inertia force changes in time (Jerk) cause noise,
shorten life, surface wear, and fatigue of adjacent
Characteristics of Parabolic Motion? - correct answer-A cam mechanism with the basic
curve;The acceleration, is maximum at the
initial position, zero at the mid-position, and negative maximum at the final
position.
Disadvantages of Parabolic Motion? - correct answer-Even though the velocity and
acceleration is finite, the
maximum acceleration is discontinuous at the start and end of
the rise period. Hence the third derivative, jerk, will be infinite at
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