Which of the following is an appropriate power supply rating for a typical 50-watt output mobile FM transceiver?

Explanation

Mobile transceivers are designed for a nominal vehicle system voltage of 13.8 volts, and a 50-watt transmitter drawing that voltage needs roughly 10 to 12 amperes because it is not 100 percent efficient. A 4-ampere supply cannot deliver the transmit current, and 24 volts is the wrong voltage for the radio.