27. When measuring voltage, if the test leads had been connected with the incorrect
polarity, what should you do?
A. Disconnect the source and then measure the voltage.
B. Change the function switch to either +DC or - DC.
C. Change the range switch to a higher range.
D. Change the range switch to the other side of the ranges.
E. Nono of the above

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.