In a binary-weighted digital-to-analog converter (DAC), the values of the input resistors are chosen to be proportional to the binary weights of the corresponding input bits.

Use the two's complement system to add the signed numbers 11110010 and 11110011. Determine, in decimal, the sign and value of each number and
their sum.

If a current of 40 mA flows through a series circuit consisting of a 0.4 F capacitor and a resistor in series with a 4 kHz, 40 V_{ac} source, what is the total circuit impedance?

A logic probe is placed on the output of a gate and the display indicator is dim. A logic pulser is used on each of the input terminals, but the output indication does not change. What is wrong?

A.

The dim indication on the logic probe indicates that the supply voltage is probably low.

B.

The output of the gate appears to be open.

C.

The LOW indication is the result of a bad ground connection on the logic probe.