226. The rotating shafts tend to vibrate violently at whirling speeds because
227. Which of the following is an inversion of a double slider crank chain?
228. The unbalanced force due to revolving masses
229. The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft, and I = Mass moment of inertia of the disc attached at the end of a shaft)
230. If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be
231. The Grubler's criterion for determining the degrees of freedom (n) of a mechanism having plane motion is (where l = Number of links, and j = Number of binary joints)
232. In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be
233. When two pulleys are connected by means of an open belt drive, then both the pulleys will rotate is opposite directions.
234. A mechanism consisting of four links is called a __________ mechanism.
235. The amplitude of vibration is always __________ the radius of the circle.
236. An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the
237. In vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted force and the disturbing force is
238. Which of the following is an inversion of a single slider crank chain?
239. A very sensitive governor will cause hunting.
240. In a radial cam, the follower moves
241. The piston slide valve is an inside admission valve.
242. The critical speed of a shaft in revolution per second is __________ as that of natural frequency of transverse vibration.
243. Which of the following is a turning pair?
244. In a simple train of wheels, the velocity ratio __________ the intermediate wheels.
245. The two elements of a pair are said to form a higher pair, when they
246. The maximum fluctuation of energy is the
247. The method of obtaining different mechanisms by fixing in turn different links in a kinematic chain, is known as
248. In a steam engine, the link constitutes a
249. The secondary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is
250. In a kinematic chain, a quaternary joint is equivalent to