In a countersinking operation, once the tool reaches the proper depth, what should the operator do to ensure hole concentricity and a good surface finish? 1. Back the tool in and out of the bottom of the hole several times.
2. Increase the spindle speed one and a half times the normal rate.
3. Turn off the spindle to let the hole walls cool before continuing.
4. Let the tool run a few seconds before backing out of the hole.

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.