Which of the following is a DC power supply for the ADF?

Which of the following is a DC power supply for the ADF?

• A. 26 VDC
• B. 115 VAC
• C. 120 VAC
• D. 28 VAC

Answer: (A)

A direct current power supply is what the ADF requires because its internal circuits and regulators expect a steady, unidirectional voltage. Among the options, only 26 VDC is a DC supply, which means the voltage is always in the same direction with solid, constant polarity. The other values are alternating voltages: 115 VAC and 120 VAC are typical mains supplies, which alternate and would need rectification and filtering to become usable DC. The 28 VAC is also alternating current and would likewise need conversion. For the ADF’s power rails, a stable DC input like 26 VDC is the appropriate choice.

A direct current power supply is what the ADF requires because its internal circuits and regulators expect a steady, unidirectional voltage. Among the options, only 26 VDC is a DC supply, which means the voltage is always in the same direction with solid, constant polarity. The other values are alternating voltages: 115 VAC and 120 VAC are typical mains supplies, which alternate and would need rectification and filtering to become usable DC. The 28 VAC is also alternating current and would likewise need conversion. For the ADF’s power rails, a stable DC input like 26 VDC is the appropriate choice.