Theory of Machines Miscellaneous
- The mechanism used in a shaping machine is
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NA
Correct Option: D
NA
- Match the following:
Type of Mechanism
P. Scott - Russel mechanism
Q. Geneva mechanism
R. Off-set slider-crank mechanism
S. Scotch Yoke mechanism
Motion achieved
1. Intermittent motion
2. Quick return motion
3. Simple harmonic motion
4. Straight line motion
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NA
Correct Option: C
NA
- Which kind of 4-bar mechanism is O2ABO4?
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AB = √(240)² + (160 − 60)²
= 260 mm
= = lAO2 + lO2O4 < lAB + lBO4
= and O2O4 is fixed link. It will act as a crank-rocker mechanismCorrect Option: B
AB = √(240)² + (160 − 60)²
= 260 mm
= = lAO2 + lO2O4 < lAB + lBO4
= and O2O4 is fixed link. It will act as a crank-rocker mechanism
Direction: An instantaneous configuration of a four-bar mechanism, whose plane is horizontal, is shown in the figure below. At this instant, the angular velocity and angular acceleration of link O2A are ω = 8 rad/s and α = 0, respectively, and the driving torque (τ) is zero. The link O2A is balanced so that its centre of mass falls at O2.
- At the instant considered, what is the magnitude of the angular velocity of O4B?
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ω4 = I12I24 = 144 ω2 I14I24 240 + 144 ω4 = 144 8 384 ∴ ω4 = 144 × 8 = 3 rad/s 384 Correct Option: B
ω4 = I12I24 = 144 ω2 I14I24 240 + 144 ω4 = 144 8 384 ∴ ω4 = 144 × 8 = 3 rad/s 384
- At the instant considered, what is the magnitude of the angular velocity of O4B?
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ω4 = I12I24 = 144 ω2 I14I24 240 + 144 ω4 = 144 8 384 ∴ ω4 = 144 × 8 = 3 rad/s 384 Correct Option: B
ω4 = I12I24 = 144 ω2 I14I24 240 + 144 ω4 = 144 8 384 ∴ ω4 = 144 × 8 = 3 rad/s 384
