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In a punching press, the requirement is to punch 40 mm diameter holes in a plate having a thickness of 15 mm. The rate at which the holes should be punched is 30 holes/min. Energy requirement is of 6 N-m per mm2 of sheared area. If the punching takes time 1/10 of a second and the speed of the flywheel varies from 160 to 140 rpm, determine the mass of the flywheel having radius of gyration of 1 m.
In Die cutting operation, punching a number of holes in a sheet is called 
A right angled triangle was cut from a rectangular sheet of length 20 cm whose perimeter is same as a square of side 30 cm. If height of the triangle is same as breadth of rectangular sheet and base is 1/4th of length of sheet then, the area of the remaining sheet is what percent of area of the whole sheet?
If q is the punching shear resistance per unit area a, is the side of a square footing for a column of side b, carrying a weight W including the weight of the footing, the depth (D) of the footing from punching shear consideration, is
Among punching and drilling, punching is safer.
In a punching press, load is 0 at the time of punching.
Study the folding and punching of the given paper sheet Y and select the option that is closer to the unfolded sheet:
Which among the NC operations given below are continuous path operations?Arc Welding (AW), Drilling (D), Laser Cutting of Sheet Metal (LC), Milling (M), Punching in Sheet Metal (P), Spot Welding (SW)
Which among the NC operations given below are continuous path operations?
Arc Welding (AW), Drilling (D), Laser Cutting of Sheet Metal (LC), Milling (M), Punching in Sheet Metal (P), Spot Welding (SW)
The correct statements are A. We can not see a bird’s ears. A bird has tiny holes on both sides of its head. B. Generally, the holes are covered with feathers. C. You will see tiny holes on a lizard’s head. These are its ears. D. A crocodile also has ears like this, but we can not see them easily.