CET ECG Equipment Operation & Maintenance 2

Question 1

Which ECG machine setting controls the speed at which paper moves during recording?

Accepted Answer

Paper speed control

Answer

Paper speed control determines how fast the paper advances, with 25 mm/sec being the standard US setting.

Question 2

What is the purpose of the right leg (RL) electrode in a standard 12-lead ECG?

Accepted Answer

Serves as the electrical ground to reduce interference

Answer

The right leg electrode serves as the electrical ground (neutral) to minimize common-mode noise and interference in the recording.

Question 3

When cleaning reusable ECG electrodes, which agent should be avoided because it can degrade the metal contact surface?

Accepted Answer

Sodium hypochlorite (bleach)

Answer

Sodium hypochlorite (bleach) can corrode and pit metal electrode surfaces, degrading conductivity over time.

Question 4

A technician notices the ECG machine displays 'LEAD FAIL' for lead II. Which electrode connection should be checked first?

Accepted Answer

Right arm (RA) and left leg (LL) electrodes

Answer

Lead II is derived from the potential difference between the right arm (RA, negative) and left leg (LL, positive), so those connections should be checked.

Question 5

What does the '1 mV standardization mark' at the beginning of an ECG tracing verify?

Accepted Answer

That the machine's sensitivity is properly calibrated at 10 mm/mV

Answer

The 1 mV standard pulse should produce a 10 mm (two large squares) deflection, confirming the machine is calibrated at standard sensitivity.

(CET) Certified Electrocardiogram Technician Practice Test

(CET) Certified Electrocardiogram Technician Practice Test

CET ECG Equipment Operation & Maintenance 2