CET Test Equipment and Measurements 3

Question 1

Probe compensation adjustment on an oscilloscope is performed to:

Accepted Answer

Match the probe's capacitance to the oscilloscope input for flat frequency response

Answer

Extend the probe's maximum voltage rating

Answer

Calibrate the oscilloscope's timebase accuracy

Answer

Protect the probe tip from electrostatic discharge

Question 2

What does the acronym VSWR stand for in RF measurements?

Accepted Answer

Voltage Standing Wave Ratio

Answer

Variable Signal Wave Response

Answer

Vertical Scale Waveform Reading

Answer

Variable Spectrum Width Range

Question 3

What is the primary purpose of a vector network analyzer (VNA)?

Accepted Answer

To measure S-parameters, impedance, and frequency response of RF components

Answer

To analyze Ethernet network packet traffic

Answer

To generate complex modulated waveforms for transmitter testing

Answer

To measure DC power supply ripple and regulation

Question 4

True RMS multimeters are essential when measuring:

Accepted Answer

Non-sinusoidal AC waveforms such as square waves or distorted signals

Answer

DC battery voltage in simple circuits

Answer

Pure sine wave AC from a regulated source

Answer

Resistance in purely resistive DC circuits

Question 5

Rise time of a signal measured on an oscilloscope is conventionally defined as the time for the signal to transition from:

Accepted Answer

10% to 90% of final amplitude

Answer

0% to 100% of final amplitude

Answer

25% to 75% of final amplitude

Answer

50% to 100% of final amplitude

Question 6

Which instrument or technique is most appropriate for measuring the phase difference between two electronic signals?

Accepted Answer

Dual-trace oscilloscope or dedicated phase meter

Answer

Spectrum analyzer in zero-span mode

Answer

Frequency counter with channel B input

Answer

LCR meter in phase-angle mode

Question 7

When calibrating test equipment, a NIST-traceable calibration standard ensures:

Accepted Answer

Measurements can be traced to national standards for verified accuracy

Answer

The equipment operates at maximum rated power output

Answer

The equipment is protected from electrostatic discharge damage

Answer

The meter displays zero when the test leads are open