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New Cdc Study > Volume 1 Unit 1 > Flashcards

Volume 1 Unit 1 Flashcards

1
Q

A Zener diode is specifically designed to operate in

a. avalanche breakdown mode.
b. thermal runaway mode.
c. forward bias mode.
d. reverse bias mode.

A

Reverse Bias Mode

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2
Q

Which statement describes an advantage of using fiber optic (FO) cables?

a. The easy tap-ability of fiber optic cables reduces security risks.
b. Fiber optic cable has a higher attenuation than coaxial cable.
c. Electromagnetic fields do not affect fiber optic cables.
d. Nuclear radiation does not affect fiber optic cable.

A

Electromagnetic fields do not affect fiber optic cables

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3
Q

One disadvantage to using fiber optic (FO) cables is that

a. fiber optic cables are easy to tap and cause a security risk.
b. they have a low bandwidth and can only carry a few signals at once.
c. nuclear radiation can darken the optical fiber and cause signal loss.
d. required fiber optics weigh more and take up more space than metallic cables.

A

Nuclear radiation can darken the optical fiber and cause signal loss

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4
Q 
What component of a fiber optic (FO) cable provides the reflective surface that allows light 
to propagate?
a. Core.
b. Jacket.
c. Buffer.
d. Cladding.
A

Cladding

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5
Q

When considering light wave propagation, what is the name of the angle between the
normal in the first material and the ray that is bounced back in the first material?
a. Angle of refraction.
b. Angle of incidence.
c. Angle of reflection.
d. Critical angle.

A

Angle of Reflection

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6
Q 
What logarithmic expression do we use to specify the ratio of power loss in fiber optic (FO) 
cables?
a. Decibels-per-nanometer (dB/nm).
b. Decibels-per-kilometer (dB/km).
c. Decibels-per-centimeter (dB/cm).
d. Decibels-per-meter (dB/m).
A

dBm

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7
Q

What is the most useful way to classify fiber optic (FO) cable?

a. Fiber material and number of fibers.
b. Buffer type and application method.
c. Numerical aperture and cable elements.
d. Core’s refractive index profile and number of modes.

A

Core’s refractive index profile and number of modes

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8
Q

In 1819, Hans Christian Oersted discovered the strength of a magnetic field can be changed
by varying what characteristic?
a. Polarity of alternating current (AC) applied to the magnet.
b. Polarity of direct current (DC) applied to the magnet.
c. Adding an opposing pole to the magnet.
d. Current through a conductor

A

Current through a conductor

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9
Q

If a conductor lies in a magnetic field, and either the field or conductor moves, a voltage is
induced in the conductor. This effect is called
a. electromagnetic conduction.
b. electromagnetic induction.
c. magnetic conduction.
d. magnetic impedance.

A

electromagnetic induction

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10
Q

A capacitor will oppose a change in

a. current and store energy in a magnetic field.
b. resistance and store energy in a magnetic field.
c. current and store energy in an electrostatic field.
d. voltage and store energy in an electrostatic field.

A

Change in Voltage

Store energy in Electrostatic Field

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11
Q

The two basic purposes of a transistor are either to perform as a

a. switch or amplify a circuit.
b. capacitor or amplify a circuit.
c. switch or perform as an electromagnetic conductor.
d. capacitor or perform as an electromagnetic conductor.

A

Switch or amplify a circuit

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12
Q

An advantage of integrated circuits (IC) is that they

a. are more reliable.
b. are easily repaired.
c. are larger in size and weight.
d. help dissipate heat generated in other circuits.

A

Reliable

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13
Q

The number of pulses in the direct current (DC) output of a bridge rectifier is called the

a. filter.
b. regulator.
c. filter frequency.
d. ripple frequency.

A

Ripple Frequency

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14
Q

What power supply circuit senses changes in output voltages and compensates for the
changes, usually within plus or minus (±) 0.1 percent?
a. Regulator.
b. Rectifier.
c. Ripple.
d. Filter

A

Regulator

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15
Q 
What wave-shaping circuit ties down the upper or lower extremity of a waveform to a fixed 
direct current (DC) potential?
a. Cutoff.
b. Limiter.
c. Oscillator.
d. Clamping.
A

Clamping

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16
Q

What is the binary equivalent of the decimal number 7?

a. 100.
b. 101.
c. 111.
d. 1011.

A

111

17
Q

What is the binary coded decimal (BCD) equivalent of the binary number 1011?

a. B.
b. 11.
c. 0000 1011.
d. 0001 0001.

A

0001 0001

18
Q

What data bus was originally developed for military avionics applications?
a. Institute of Electrical and Electronics Engineers (IEEE)–488, General Purpose Interface Bus
(GPIB).
b. Recommended standard 232.
c. Military Standard (MIL-STD)–1553.
d. Recommended Standard (RS)–488.

A

MIL-STD-1553

19
Q

Energy travels through a waveguide because of

a. electric fields.
b. magnetic fields.
c. harmonic balance of the signal frequency.
d. interaction of magnetic and electric fields

A

Interaction

20
Q

Reducing modulation to less than 100 percent results in

a. more total power.
b. a reduction in carrier power.
c. no reduction in carrier power.
d. a reduction in carrier and sideband power.

A

No reduction in carrier power

21
Q

The formula to find the modulating index is

a. deviation divided by frequency of modulation.
b. deviation times frequency of modulation.
c. sideband divided by carrier frequency.
d. sideband times carrier frequency.

A

Deviation / Frequency of Modulation

22
Q 
What is the modulation index of a 5 kilohertz (kHz) modulating signal that has enough peak 
voltage to cause a deviation of 15 kHz?
a. 0.3.
b. 0.5.
c. 3.0.
d. 5.0.
A

3

23
Q

What is the formula for Bandwidth?

A

2 x modulating frequency

24
Q

If the modulating audio signal is 10 kilohertz (kHz) wide, what is the bandwidth (BW) of
the transmitted amplitude modulated signal?
a. 5 kHz.
b. 10 kHz.
c. 15 kHz.
d. 20 kHz.

A

20

25
Q

In phase modulation, the rate of phase shift is

a. proportional to the frequency of the modulating signal.
b. proportional to the amplitude of the modulating signal.
c. inversely proportional to the frequency of the modulating signal.
d. inversely proportional to the amplitude of the modulating signal.

A

Proportional to the frequency of the modulating signal

26
Q

What is the first step in the pulse code modulation (PCM) process?

a. Assigning discrete amplitudes to the sampling pulses.
b. Assigning a binary code number to the sample.
c. Quantizer limiting the amplitude of the pulses.
d. Band-limiting the analog signal.

A

band-limiting the analog signal

27
Q

What type of fiber has a core diameter of 50–125 micrometers (µm) and consists of
numerous concentric layers of glass, something like the annular rings of a tree, configured to
reduce dispersion?
a. Multimode step-index.
b. Single-mode step-index.
c. Multimode graded-index.
d. Single-mode graded-index.

A

Multi-Mode Graded Index

New Cdc Study (6 decks)

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