Final answer:
Both Technician A and Technician B could be correct regarding the input and output voltages of ignition transformers for gun-type oil burners, as there are transformers that function at those specified voltages.
Step-by-step explanation:
The question refers to the input and output voltages of an ignition transformer used on a gun-type oil burner. While the output voltages for ignition transformers can vary, common input voltages in the United States are 120 volts or 240 volts, with output voltages typically in the range of 10,000 to 20,000 volts. Therefore, both Technician A and Technician B could potentially be correct, as there are transformers that operate at both 208 volts and 15,000 volts, as well as at 120 volts and 10,000 volts. As for the question, the correct answer would be d. both a and b. Ignition transformers are pivotal in oil burners as they provide the high voltage necessary for sparking the burner's ignition.