Z3D153 - 2016 Edit Code 3, Volume 1 Part 3
RF Transmissions Journeyman CDCs. Split up 20 questions at a time.
- 1.What are the three general categories used to produce modulation in radio frequency (RF) transmission today?
- A.
Binary amplitude shift keying, frequency shift keying, and phase shift keying.
- B.
Pulse amplitude, pulse width, and pulse position.
- C.
Amplitude, frequency, and phase.
- D.
Analog, digital and shift keying.
- 2.When the modulating signal and carrier signal are combined within a modulator, the output signal contains
- A.
Modulating signal, upper sideband, and lower sideband.
- B.
Carrier, upper sideband, and lower sideband.
- C.
Upper sideband and modulating signal.
- D.
Carrier and modulating signal.
- 3.What factor determines the spacing of the sidebands in an amplitude modulated signal?
- A.
Amplitude of the modulating signal.
- B.
Frequency of the modulating signal.
- C.
Amplitude of the carrier signal.
- D.
Frequency of the carrier signal.
- 4.The amount of effect or change that the intelligence has on the carrier in an amplitude modulated signal is expressed as the
- A.
Percent of modulation.
- B.
Modulation index.
- C.
Bandwidth.
- D.
Deviation.
- 5.Reducing modulation to less than 100 percent gives
- A.
More total power.
- B.
A reduction in carrier power.
- C.
No reduction in carrier power.
- D.
A reduction in carrier and sideband power.
- 6.The output of the oscillator in a frequency modulation (FM) modulator increases in frequency with each
- A.
Positive half cycle of the carrier.
- B.
Negative half cycle of the carrier.
- C.
Positive half cycle of the modulating signal.
- D.
Negative half cycle of the modulating signal.
- 7.A 5 kilohertz (kHz) modulating signal has enough peak voltage to cause a deviation of 15kHz. What is the modulation index?
- A.
5.
- B.
3.
- C.
0.5.
- D.
0.3.
- 8.What is the narrow frequency band between adjacent stations used to prevent frequency modulated sidebands from overlapping?
- A.
Space.
- B.
Guard band.
- C.
Buffer zone.
- D.
Prevention field.
- 9.What is the advantage of adding more phase shifts?
- A.
Easier detection.
- B.
Smaller bit error rate.
- C.
Better signal-to-noise ratio.
- D.
Higher data rates within a given bandwidth.
- 10.What is the first step in the pulse code modulation process?
- A.
Discrete amplitudes are assigned to the sampling pulses.
- B.
A binary code number is assigned to the sample.
- C.
The quantizer limits the amplitude of the pulses.
- D.
The analog signal is band limited.
- 11.Quantization in the pulse code modulation process is
- A.
Converting a continuous time signal into a discrete time signal.
- B.
Ensuring the input to the sampler never exceeds maximum frequency.
- C.
Placing an infinite number of amplitude values to a finite number of values.
- D.
Limiting the highest and lowest frequency encoded before it goes to the sampler.
- 12.In asynchronous transmissions, what bit is used by the receiving device to verify that the transmission was received correctly?
- A.
Control.
- B.
Parity.
- C.
Start.
- D.
Stop.
- 13.If an error should occur, what transmission is lost in an synchronous transmission?
- A.
One character.
- B.
Block of data.
- C.
A parity bit.
- D.
A stop bit.
- 14.The significance the amount of ones have in a data bit pattern when using vertical redundancy check (VRC) is that it determines
- A.
Parity.
- B.
Transmission rate.
- C.
Whether transmission is synchronous or asynchronous.
- D.
Whether transmission is in American Standard Code for Information Interchange (ASCII) format.
- 15.What two error detection methods, when used together, are 98 percent effective in detecting errors?
- A.
Longitudinal redundancy check (LRC) and checksum.
- B.
Checksum and cyclic redundancy check (CRC).
- C.
Vertical redundancy check (VRC) and CRC.
- D.
VRC and LRC.
- 16.When using forward error control as a method of error correction, where does error correction take place?
- A.
Receiving end.
- B.
In the oscillator.
- C.
Transmitting end.
- D.
In the primary buffers.
- 17.In telecommunications cable, the “tip” or “primary” wire color group order is
- A.
White, blue, green, yellow, and violet.
- B.
Blue, orange, green, brown, and slate.
- C.
White, red, black, yellow, and violet.
- D.
Blue, green, yellow, red, and orange.
- 18.Two types of network cables are
- A.
Straight through and crossover.
- B.
Straight through and flip/flop.
- C.
High and low baud.
- D.
“n” and “g”.
- 19.An optical transmitter is comprised of
- A.
Positive intrinsic negative and avalanche photodiodes.
- B.
Repeaters, regenerators, and optical amplifiers.
- C.
A driver, optical source, and fiber optic pigtail.
- D.
A light detector and output circuits.
- 20.What is the bandwidth of multimode step-index optical fiber cable?
- A.
10 MHz – 100 MHz/km.
- B.
100 MHz – 200 MHz/km.
- C.
200 MHz – 1000 MHz/km.
- D.
Up to 50 GHz/km.
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