Theory of Machine The rotating shafts tend to vibrate violently at whirling speeds because The shafts are rotating at very high speeds The system is unbalanced Resonance is caused due to the heavy mass of the rotor Bearing centre line coincides with the axis The shafts are rotating at very high speeds The system is unbalanced Resonance is caused due to the heavy mass of the rotor Bearing centre line coincides with the axis ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine The amplitude of vibration is always __________ the radius of the circle. Equal to Greater than Less than None of these Equal to Greater than Less than None of these ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine In S.H.M., the velocity vector w.r.t. displacement vector Lags by 90° Leads by 90° Are in phase Leads by 180° Lags by 90° Leads by 90° Are in phase Leads by 180° ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine 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 12,000 r.p.m. 9,360 r.p.m. 6,000 r.p.m. 5,367 r.p.m. 12,000 r.p.m. 9,360 r.p.m. 6,000 r.p.m. 5,367 r.p.m. ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine 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 The reaction on the front wheels increases and on the rear wheels decreases The reaction on me inner wheels increases and on the outer wheels decreases The reaction on the outer wheels increases and on the inner wheels decreases The reaction on the rear wheels increases and on the front wheels decreases The reaction on the front wheels increases and on the rear wheels decreases The reaction on me inner wheels increases and on the outer wheels decreases The reaction on the outer wheels increases and on the inner wheels decreases The reaction on the rear wheels increases and on the front wheels decreases ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine The number of links and instantaneous centers in a reciprocating engine mechanism are 4, 4 5, 4 4, 5 4, 6 4, 4 5, 4 4, 5 4, 6 ANSWER DOWNLOAD EXAMIANS APP
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