Theory of Machine Lower pairs are those which have Two elements that permit relative motion Elements of pairs not held together mechanically Point or line contact between the two elements when in motion Surface contact between the two elements when in motion Two elements that permit relative motion Elements of pairs not held together mechanically Point or line contact between the two elements when in motion Surface contact between the two elements when in motion ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine The size of cam depends upon Pitch curve Base circle Pitch circle Prime circle Pitch curve Base circle Pitch circle Prime circle ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine Whitworth quick return mechanism is obtained by inversion of Kinematic chain Slider crank mechanism Roller cam mechanism Five link mechanism Kinematic chain Slider crank mechanism Roller cam mechanism Five link mechanism ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine Which one of the following is an exact straight line mechanism using lower pairs? Watt’s mechanism Robert’s mechanism Peaucellier’s mechanism Grasshopper mechanism Watt’s mechanism Robert’s mechanism Peaucellier’s mechanism Grasshopper mechanism ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction) P = W cos(α + φ) P = W tan(α - φ) P = W tan(α + φ) P = W tan(φ - α) P = W cos(α + φ) P = W tan(α - φ) P = W tan(α + φ) P = W tan(φ - α) ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine To obviate axial thrust, following gear drive is used Double helical gears having opposite teeth Single helical gear in which one of the teeth of helix angle a is more Double helical gears having identical teeth Mutter gears Double helical gears having opposite teeth Single helical gear in which one of the teeth of helix angle a is more Double helical gears having identical teeth Mutter gears ANSWER DOWNLOAD EXAMIANS APP
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