Technician A says a tachometer is used to measure drive shaft speed. Technician B says a tachometer receives its signal from the plus side of the ignition coil. Who is correct?
A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Question

Quizplus · Accepted Answer

A tachometer is typically used to measure the engine's RPM (revolutions per minute), not the drive shaft speed. While it can receive signals from various sources depending on the vehicle's design, saying it receives its signal exclusively from the plus side of the ignition coil is too specific and may not apply to all vehicles, especially those with modern engine management systems.

Technician a Says a Tachometer Is Used to Measure Drive