71. A pulley and belt in a belt drive form a
72. Elements of pairs held together mechanically is known as
73. Carnot cycle is
74. The unbalanced primary forces in a reciprocating engine are
75. A motor car moving at a certain speed takes a left turn in a curved path. If the engine rotates in the same direction as that of wheels, men due to centrifugal force
76. If the radius of gyration of a compound pendulum about an axis through e.g. is more, then its frequency of oscillation will be
77. In gramophones for adjusting the speed of the turntable, the following type of governor is commonly employed
78. A spring controlled governor is said to be isochronous when the controlling force
79. A spring controlled governor is said to be unstable when the controlling force
80. A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is
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