39) Circuits that shift the dc level of a signal are called

40) In a C-E configuration, an emitter resistor is used for

41) How many storage locations are available when a mercury device has twelve address lines?

42) The logic family with the lowest power dissipation is

43) When 30V is applied to four series resistors, 60 microAmps flows. If R1=42 k Ohm, R2=47 k Ohm, and R3=56 k Ohm, what is the value of R4?