GROL Test Equipment and Measurements

Question 1

What instrument is used to measure the standing wave ratio (SWR) on a transmission line?

Accepted Answer

SWR meter (directional wattmeter)

Answer

An SWR meter (or directional wattmeter) measures forward and reflected power on a transmission line to calculate the standing wave ratio.

Question 2

What does a spectrum analyzer display?

Accepted Answer

Signal amplitude versus frequency

Answer

A spectrum analyzer displays signal amplitude (usually in dBm) as a function of frequency, allowing visualization of harmonics, spurious signals, and bandwidth.

Question 3

What is the function of a signal generator in RF testing?

Accepted Answer

To provide a known, calibrated test signal at a specified frequency and amplitude

Answer

A signal generator produces a stable, calibrated output signal used to test and align receivers, filters, and other RF equipment.

Question 4

What does an oscilloscope primarily measure?

Accepted Answer

Voltage as a function of time

Answer

An oscilloscope displays voltage waveforms as a function of time, allowing measurement of amplitude, frequency, period, and waveshape.

Question 5

What is a dummy load used for in radio testing?

Accepted Answer

To provide a non-radiating resistive load for testing transmitters without transmitting over the air

Answer

A dummy load is a non-inductive resistive load that absorbs transmitter power without radiating, allowing testing and adjustment without causing interference.

(GROL) General Radiotelephone Operator License Practice Test

(GROL) General Radiotelephone Operator License Practice Test

GROL Test Equipment and Measurements