41. When the nature of contact between the elements of a pair is such that it can only slide relative to the other, the pair is known as a
42. When the nature of contact between the elements of a pair is such that one element can turn about the other by screw threads, the pair is known as a
43. The main disadvantage of the sliding pair is that it is
44. The mechanism in which two are turning pairs and two are sliding pairs, is called a
45. In a pantograph, all the pairs are
46. Frequency of vibrations is usually expressed in
47. In a steam engine, the distance by which the outer edge of the D-slide valve overlaps the steam port is called
48. 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
49. A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if
50. The frequency of damped vibrations with viscous damping is ________ the frequency of undamped vibrations.
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