Question 1

Which of the following is the most troublesome form of external noise?&#10;A)Atmospheric&#10;B)Human-made&#10;C)Space&#10;D)Thermal

Accepted Answer

Human-made noise, such as traffic, construction, and machinery, is generally considered the most troublesome form of external noise as it is often constant and unpredictable. This type of noise can be significantly disruptive and detrimental to communication and overall well-being.

Question 2

Electronics as a discipline within the field of physical science emerged from the discovery of __________.&#10;A)microwaves&#10;B)gamma rays&#10;C)cosmic rays&#10;D)radio waves

Accepted Answer

Electronics as a discipline emerged from the discovery of radio waves, which are a type of electromagnetic radiation. This discovery led to the development of radio communication, television, and other electronic devices. Microwaves, gamma rays, and cosmic rays also fall under the umbrella of electromagnetic radiation, but they did not directly lead to the development of electronics as a discipline.

Question 3

Which of the following did French mathematician Jean Baptiste Joseph Fourier develop?&#10;A)A means to break down any periodic waveform into a series of sine and/or cosine waves at multiples of the fundamental frequency.&#10;B)He created thermal interactions between free electrons and vibrating ions in a conductor.&#10;C)The formula for calculating shot noise contributed for a complete transistor.&#10;D)The relative measure of the desired signal power to the noise power.

Accepted Answer

Jean Baptiste Joseph Fourier developed Fourier analysis, which is a mathematical technique for breaking down complex periodic signals into simple sine waves. This technique is widely used in many fields including mathematics, physics, and engineering.

Question 4

Electric and magnetic fields both result from voltage potentials and _________.&#10;A)Radio frequencies&#10;B)Audio frequencies&#10;C)Current flows&#10;D)Electric charges

Accepted Answer

Electric and magnetic fields are generated by current flows, as described by Maxwell's equations. These fields are fundamental aspects of electromagnetism and are not directly caused by voltage potentials alone but by the movement of electric charges, which constitutes a current.

Question 5

What three ratios do decibels represent?&#10;A)Powers, voltages, currents&#10;B)Powers, voltages, frequencies&#10;C)Voltages, frequencies, impedances&#10;D)Logarithms, voltages, currents

Accepted Answer

Decibels are a logarithmic unit that represents ratios. In the case of power, voltage, and current, the decibel values represent the ratio of the measured value to a reference value. Therefore, the correct choice is A as it lists the ratios of powers, voltages, and currents.

Question 6

What do modulated signals convey?&#10;A)Information&#10;B)Voltage&#10;C)Noise&#10;D)Power

Accepted Answer

Modulated signals convey information. This is because modulation is the process of changing certain properties of the signal, such as its amplitude or frequency, in order to encode information onto it. This information can then be decoded by a receiver to recover the original message. Voltage, noise, and power are not typically conveyed by modulated signals, as they are characteristics of the signal itself rather than information being transmitted.

Question 7

What agency in the United States has been given the authority to establish and enforce regulations regarding the use of radio transmitters and other generators of radio-frequency energy?&#10;A)Transport and Communications Ministry&#10;B)Federal Communications Commission (FCC)&#10;C)International Telecommunication Union (ITU)&#10;D)Bell Laboratories

Accepted Answer

The Federal Communications Commission (FCC) is the agency in the United States that has been given the authority to establish and enforce regulations regarding the use of radio transmitters and other generators of radio-frequency energy. The FCC is responsible for regulating the use of the radio spectrum, promoting competition in the communications market, and protecting consumers. The Transport and Communications Ministry does not exist in the United States, the International Telecommunication Union (ITU) is a global organization that provides guidelines for telecommunications, and Bell Laboratories is a research facility owned by Nokia.

Question 8

If you were troubleshooting a piece of equipment and you heard a frying noise,what would this indicate?&#10;A)A wire is loose&#10;B)The power is weakening&#10;C)A component is about to fail&#10;D)The equipment has been abused

Accepted Answer

A frying noise typically indicates that a component in the equipment is overheating and may be on the verge of failing. It is important to immediately turn off the equipment and investigate the source of the noise to prevent further damage.

Question 9

Why would you use Friiss's formula?&#10;A)To provide the overall noise effect of a multistage system.&#10;B)To break down any periodic waveform into a series of sine and/or cosine waves at multiples of the fundamental frequency.&#10;C)To establish that different users can share bands of frequencies provided that each user was assigned exclusive use of a frequency range within that band.&#10;D)To show how the construction of a square wave can be seen to be made up of a number of sinusoids.

Accepted Answer

Friiss's formula is used to calculate the overall noise effect of a multistage system, such as in a communication system, where there are multiple stages of amplification and attenuation. It helps in determining the signal-to-noise ratio at the output of the system.

Question 10

When troubleshooting,why would you perform voltage and resistance checks?&#10;A)To check for signals&#10;B)To eliminate induced failures&#10;C)To observe frequency spectra&#10;D)To isolate defective components

Accepted Answer

Voltage and resistance checks can be used to isolate defective components. By checking the voltage and resistance levels at different points in a circuit, technicians can determine where the circuit is failing and which component may be the source of the problem. This can save time and effort in troubleshooting by focusing on specific areas of the circuit rather than testing every component individually.

Question 11

What does the graphical display produced by an oscilloscope represent?&#10;A)Signals in the frequency domain&#10;B)Time-domain representation&#10;C)Amplitude of each frequency component&#10;D)Amplitude characteristics

Accepted Answer

The answer of What does the graphical display produced by...

Question 12

____________ consists of a mixture of signals at all frequencies and at randomly occurring amplitudes.&#10;A)Decibel units&#10;B)Frequency&#10;C)Bandwidth&#10;D)Noise

Accepted Answer

The answer of ____________ consists of a mixture of signals...

Question 13

You are troubleshooting a piece of equipment and you find that unauthorized modifications may have been performed on the equipment.What type of failure does this situation represent?&#10;A)Faulty&#10;B)Complete&#10;C)Induced&#10;D)Poor system performance

Accepted Answer

The answer of You are troubleshooting a piece of equipment...

Question 14

The overall noise-intensity versus frequency curves for semiconductor devices would have what type of shape?&#10;A)Angular&#10;B)Square&#10;C)Bathtub&#10;D)Uneven

Accepted Answer

The answer of The overall noise-intensity versus frequency curves for...

Question 15

Which of the following is an essential attribute for being an effective troubleshooter?&#10;A)To know the latest trends in noise analysis&#10;B)To be able to limit the frequency response&#10;C)To know the conversion from the time to the frequency domain&#10;D)To be able to isolate faulty components quickly and repair the defective circuit

Accepted Answer

The answer of Which of the following is an essential...

Question 16

White noise is directly proportional to both temperature and _____________.&#10;A)bandwidth&#10;B)AC voltage&#10;C)power transfer&#10;D)frequency

Accepted Answer

The answer of White noise is directly proportional to both...

Question 17

Which of the following could cause a complete failure in a piece of equipment?&#10;A)Sporadic circuit operation&#10;B)Open power resistors&#10;C)Poor soldering&#10;D)Poor alignment

Accepted Answer

The answer of Which of the following could cause a...

Question 18

Which of the following pieces of equipment would be considered advanced test equipment?&#10;A)Digital multimeter (DMM)&#10;B)Broadband oscilloscope&#10;C)Spectrum analyzer&#10;D)RF generator

Accepted Answer

The answer of Which of the following pieces of equipment...

Question 19

What two factors limit all communication systems?&#10;A)Bandwidth and noise&#10;B)Bandwidth and frequency&#10;C)Noise and decibels&#10;D)Noise and currents

Accepted Answer

The answer of What two factors limit all communication systems?&#10;A)Bandwidth...

Question 20

The carrier is often a(n)_____________.&#10;A)sine wave&#10;B)vector&#10;C)angular frequency&#10;D)amplitude modulation

Accepted Answer

The answer of The carrier is often a(n)_____________.&#10;A)sine wave&#10;B)vector&#10;C)angular frequency&#10;D)amplitude...

Question 21

What does the noise figure (NF)specify?&#10;A)Exactly how noisy a device is&#10;A)The ultimate noise performance&#10;B)The noise content at a specific point&#10;C)The paths in which the charge carriers move

Accepted Answer

The answer of What does the noise figure (NF)specify?&#10;A)Exactly how...

Question 22

The terms Johnson,thermal,and _____ noise may be used interchangeably.&#10;A)white&#10;B)space&#10;C)internal&#10;D)external

Accepted Answer

The answer of The terms Johnson,thermal,and _____ noise may be...

Question 23

Which of the following defines frequency domain?&#10;A)Square waves are made up of the fundamental and its odd -numbered harmonics&#10;B)Amplitude is viewed as a function of frequency rather than of time&#10;C)Amplitude of each harmonic decreases as the frequency increases&#10;D)Any or all of the sine or cosine terms may be zero, and there are no restrictions on their amplitudes

Accepted Answer

The answer of Which of the following defines frequency domain?&#10;A)Square...

Question 24

What is the function of a transducer?&#10;A)Displays waveforms in the time domain&#10;B)Converts energy from one form to another&#10;C)Allows for spectrum analysis to be accomplished relatively easily in software&#10;D)Supplies test signal at the input of a circuit

Accepted Answer

The answer of What is the function of a transducer?&#10;A)Displays...

Question 25

Why are bandwidths valuable?&#10;A)Waveforms are limited.&#10;B)Analog signals are digitized.&#10;C)Wireless channels are impractical.&#10;D)Frequencies are scarce.

Accepted Answer

The answer of Why are bandwidths valuable?&#10;A)Waveforms are limited.&#10;B)Analog signals...

Deck 1: Fundamental Communications Concept