Machine Design When a hole of diameter ‘d’ is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate) t.τu π/4 × d².τu πd.t.τu π/4 × d² × tτu t.τu π/4 × d².τu πd.t.τu π/4 × d² × tτu ANSWER DOWNLOAD EXAMIANS APP
Machine Design Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to Dynamic loading Completely reversed loading Static loading Combined static and dynamic loading Dynamic loading Completely reversed loading Static loading Combined static and dynamic loading ANSWER DOWNLOAD EXAMIANS APP
Machine Design The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that It is subjected to a higher cyclic loading than the outer side It has a lower curvature than the outer side It is more stretched than the outer side during the manufacturing process It is subjected to a higher stress than the outer side It is subjected to a higher cyclic loading than the outer side It has a lower curvature than the outer side It is more stretched than the outer side during the manufacturing process It is subjected to a higher stress than the outer side ANSWER DOWNLOAD EXAMIANS APP
Machine Design If the centre distance of the mating gears having involute teeth is increased, then the pressure angle Decreases Remains unchanged Increases None of these Decreases Remains unchanged Increases None of these ANSWER DOWNLOAD EXAMIANS APP
Machine Design A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be 30 kN/m 12 kN/m 6 kN/m 24 kN/m 30 kN/m 12 kN/m 6 kN/m 24 kN/m ANSWER DOWNLOAD EXAMIANS APP
Machine Design In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because Only one belt cannot be fitted with other used belts The new belt will carry more than its share and result in short life New and old belts will cause vibrations Belts are available in sets Only one belt cannot be fitted with other used belts The new belt will carry more than its share and result in short life New and old belts will cause vibrations Belts are available in sets ANSWER DOWNLOAD EXAMIANS APP
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