Energy during actual punching operation is same as the energy supplied by the motor.

← Prev Question Next Question →

1 Answer

Related questions

+1 vote

1 answer

The balance energy required for punching is supplied by the flywheel by ________

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

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.

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

A machine punching 38 mm holes in 32 mm thick plate requires 7 N-m of energy per sq. mm of sheared area, find the maximum shear force required.

asked Sep 21, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

In a punching press, which of the following quantity is constant?

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

In a punching press, load is 0 at the time of punching.

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

The maximum shear force required for punching depends on ________

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

If the stroke punch is 100mm, find the radius of the crank in mm.

asked Sep 23, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

When the length of the connecting rod is unknown then the value (θ2 –θ1)/2π is equal to ________

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

The relation between stroke punch s and radius of crank r is ______

asked Sep 21, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

The speed of an engine varies from 210 rad/s to 190 rad/s. During the cycle the change in kinetic energy is found to be 400 Nm. The inertia of the flywheel in kg/m2 is

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

A circular solid disc of uniform thickness 20 mm, radius 200 mm and mass 20 kg, is used as a flywheel. If it rotates at 600 rpm, the kinetic energy of the flywheel, in Joules is

asked Sep 23, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

For a certain engine having an average speed of 1200 rpm, a flywheel approximated as a solid disc, is required for keeping the fluctuation of speed within 2% about the average speed. The fluctuation of kinetic energy per cycle is found to be 2 kJ. What is the least possible mass of the flywheel if its diameter is not to exceed 1 m ?

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

In actual practice, engine is assumed to work against the mean resisting torque.

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

In the turning moment diagram of a multicylinder engine, the work done during exhaust stroke is by ______

asked Sep 21, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

In a turning moment diagram, the variations of energy above and below the mean resisting torque line is called

asked Sep 23, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

For a multicylinder engine, the moment of inertia of a flywheel is 6500 kg-m^2, from the turning moment diagram, it is found that fluctuation of energy is 56000 N-m, if mean speed is 120 rpm, then find maximum speed.

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

The co-efficient of fluctuation of energy is the ratio of maximum energy to the minimum energy.

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

The ratio of the maximum fluctuation of energy to the ___________ is called coefficient of fluctuation of energy.

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

Which of the following statement is wrong? (a)The difference between the maximum and minimum energies is called maximum fluctuation of energy.

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

The maximum fluctuation of energy is the

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

The ratio of maximum fluctuation of energy to the workdone per cycle is called

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

The ratio of the maximum fluctuation of energy to the ……. is called coefficient of fluctuation of energy.

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

+1 vote

1 answer

Maximum fluctuation of energy in a flywheel is equal to

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

...