Theory-of-machines Questions Set 8:
When a cylinder is located in a V-block, the number of degrees of freedom that are constrained is:
Solution:
What is the effect of an increase in forced vibration on the risk of fatigue failure?
Solution:
A planar mechanism has 8 links and 10 rotary joints. The number of degrees of freedom of the mechanism, using Grubler's criterion, is:
Solution:
The maximum efficiency of a worm gear is given by:
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The distance by which a helix advances along the axis of a gear for one complete revolution around the axis is called
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For maximum efficiency, find the spiral angles of the two helical gears if the shaft angle is 100° and the friction angle is 10°.
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In a dual combustion cycle, the temperature at the start of the constant pressure heat addition is 1773 Kelvin and at the end is 1260 Kelvin. Determine the cut-off ratio.
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A composite bar has four sections with lengths of 50 mm, 100 mm, 150 mm, and 200 mm. When a force is applied, all the sections experience an elongation of 0.2 mm. What is the resultant strain in the bar?
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For a four-bar mechanism with a velocity ratio of output and input link as 1 : 4, if the mechanical advantage is equal to 2, and the output link is assumed to be rotating in a circle such that the mechanism is the double crank mechanism, find the efficiency of power transmitted by the mechanism.
Solution:
The flywheel of a steam engine has a radius of gyration of 1 m and mass of 2500 kg. The starting torque of the steam engine is 1500 N⋅m and may be assumed constant. The angular acceleration of the flywheel is 0.6 rad/s².
Determine the kinetic energy of the flywheel after 10 seconds from the start.
Solution:
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