Theory of Machine If the damping factor for a vibrating system is unity, then the system will be Without vibrations Critically damped Under damped Over damped Without vibrations Critically damped Under damped Over damped ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing) r sinφ r cosφ (r/2) cosφ r tanφ r sinφ r cosφ (r/2) cosφ r tanφ ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of 3.0 mm 2.22 mm 2.50 mm 2 mm 3.0 mm 2.22 mm 2.50 mm 2 mm ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine For two governors A and B, the lift of sleeve of governor A is more than that of governor B, for a given fractional change in speed. It indicates that None of these Both governors A and B are equally sensitive Governor A is more sensitive than governor B Governor B is more sensitive than governor A None of these Both governors A and B are equally sensitive Governor A is more sensitive than governor B Governor B is more sensitive than governor A ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine When a shaking force is transmitted through the springs, damping becomes detrimental when the ratio of its frequency to the natural frequency is greater than 0.5 0.25 2 1 0.5 0.25 2 1 ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine When there is a reduction in amplitude over every cycle of vibration, then the body is said to have Forced vibration Damped vibration Free vibration Under damped vibration Forced vibration Damped vibration Free vibration Under damped vibration ANSWER DOWNLOAD EXAMIANS APP
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