Theory of Machine The rotating shafts tend to vibrate violently at whirling speeds because Bearing centre line coincides with the axis The shafts are rotating at very high speeds Resonance is caused due to the heavy mass of the rotor The system is unbalanced Bearing centre line coincides with the axis The shafts are rotating at very high speeds Resonance is caused due to the heavy mass of the rotor The system is unbalanced ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine The mechanism forms a structure, when the number of degrees of freedom (n) is equal to -1 1 2 -1 1 2 ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine The example of completely constrained motion is a Motion of a piston in the cylinder of a steam engine All of these Motion of a square bar in a square hole Motion of a shaft with collars at each end in a circular hole Motion of a piston in the cylinder of a steam engine All of these Motion of a square bar in a square hole Motion of a shaft with collars at each end in a circular hole ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine Kinematic pairs are those which have Two elements that permit relative motion Surface contact between the two elements when in motion Elements of pairs not held together mechanically Point or line contact between the two elements when in motion Two elements that permit relative motion Surface contact between the two elements when in motion Elements of pairs not held together mechanically Point or line contact between the two elements when in motion ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction) α = 45° + φ/2 α = 45° - φ/2 α = 90° - φ α = 90° + φ α = 45° + φ/2 α = 45° - φ/2 α = 90° - φ α = 90° + φ ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine The unbalanced force due to revolving masses Varies in direction but constant in magnitude Varies in magnitude but constant in direction Varies in magnitude and direction both Constant in magnitude and direction both Varies in direction but constant in magnitude Varies in magnitude but constant in direction Varies in magnitude and direction both Constant in magnitude and direction both ANSWER DOWNLOAD EXAMIANS APP
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