E 4B01

Which of the following is a characteristic of a good harmonic frequency marker?

  1. Frequency stability

E4B02

Which of the following factors most affects the accuracy of a frequency counter?

  1. Time base accuracy

E4B03

What is an advantage of using a bridge circuit to measure impedance?

  1. The measurement is based on obtaining a null in voltage, which can be done very precisely

E4B04

If a frequency counter with a specified accuracy of +/- 1.0 ppm reads 146,520,000 Hz, what is the most the actual frequency being measured could differ from the reading?

  1. 146.52 Hz

E4B05

If a frequency counter with a specified accuracy of +/- 0.1 ppm reads 146,520,000 Hz, what is the most the actual frequency being measured could differ from the reading?

  1. 14.652 Hz

E4B06

If a frequency counter with a specified accuracy of +/- 10 ppm reads 146,520,000 Hz, what is the most the actual frequency being measured could differ from the reading?

  1. 1465.20 Hz

E4B07

How much power is being absorbed by the load when a directional power meter connected between a transmitter and a terminating load reads 100 watts forward power and 25 watts reflected power?

  1. 75 watts

E4B08

Which of the following is good practice when using an oscilloscope probe?

  1. Keep the ground connection of the probe as short as possible

E4B09

Which of the following is a characteristic of a good DC voltmeter?

  1. High impedance input

E4B10

What is indicated if the current reading on an RF ammeter placed in series with the antenna feedline of a transmitter increases as the transmitter is tuned to resonance?

  1. There is more power going into the antenna

E4B11

Which of the following describes a method to measure intermodulation distortion in an SSB transmitter?

  1. Modulate the transmitter with two non-harmonically related audio frequencies and observe the RF output with a spectrum analyzer

E4B12

How should a portable SWR analyzer be connected when measuring antenna resonance and feedpoint impedance?

  1. Connect the antenna feed line directly to the analyzer's connector

E4B13

What is the significance of voltmeter sensitivity expressed in ohms per volt?

  1. The full scale reading of the voltmeter multiplied by its ohms per volt rating will provide the input impedance of the voltmeter

E4B14

How is the compensation of an oscilloscope probe typically adjusted?

  1. A square wave is observed and the probe is adjusted until the horizontal portions of the displayed wave is as nearly flat as possible

E4B15

What happens if a dip-meter is too tightly coupled to a tuned circuit being checked?

  1. A less accurate reading results

E4B16

Which of these factors limits the accuracy of a D'Arsonval-type meter?

  1. Coil impedance

E4B17

Which of the following can be used as a relative measurement of the Q for a series-tuned circuit?

  1. The bandwidth of the circuit's frequency response

 

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