CET Test Equipment and Measurements

Question 1

What does the vertical axis of an oscilloscope display represent?

Accepted Answer

Voltage (volts/division)

Answer

The vertical axis of an oscilloscope represents voltage amplitude, calibrated in volts per division.

Question 2

When measuring resistance with a digital multimeter, what must be done before taking a reading?

Accepted Answer

Disconnect the circuit from its power source

Answer

Resistance measurements must be taken with the circuit de-energized to prevent meter damage and obtain accurate readings.

Question 3

What is the standard output impedance of most RF signal generators used in electronics labs?

Accepted Answer

50 ohms

Answer

Most RF signal generators have a standard 50-ohm output impedance to match the characteristic impedance of common RF coaxial transmission lines.

Question 4

A function generator can typically produce which combination of waveform types?

Accepted Answer

Sine, square, and triangle waves

Answer

A function generator produces multiple waveform shapes—including sine, square, and triangle waves—for testing electronic circuits.

Question 5

What does an LCR meter primarily measure?

Accepted Answer

Inductance, capacitance, and resistance

Answer

An LCR meter measures inductance (L), capacitance (C), and resistance (R) of passive electronic components.

(CET) Certified Electronics Technician Practice Test