Theory Of Machine - Study Mode
[#391] Under logarithmic decrement, the amplitude of successive vibrations are
Correct Answer
(C) In geometric progression
[#392] At the nodal point in a shaft, the amplitude for torsional vibration will be
Correct Answer
(C) Zero
[#393] In a multiple V-belt drive, if one of the belts is broken, then we should replace
Correct Answer
(B) All the belts
[#394] The displacement of the reciprocating roller follower, when it has contact with the straight flanks of the tangent cam, is given by (where r 1 = Minimum radius of the cam, r 2 = Radius of the roller follower and $$ heta $$ = Angle turned by the cam from the beginning of the follower displacement)
Correct Answer
(D) $$left( {{{ ext{r}}_1} + {{ ext{r}}_2}}
ight)left( {frac{{1 - cos heta }}{{cos heta }}}
ight)$$
[#395] A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as C E and C S respectively. The kinetic energy of the flywheel is given by
Correct Answer
(B) $$frac{{{ ext{W}}{{ ext{C}}_{ ext{E}}}}}{{{ ext{2}}{{ ext{C}}_{ ext{S}}}}}$$