Set 2 Vol 1 Part 2
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- 1.What power line fault category is symptomatic of a short term decrease in voltage levels?
- A.
Sag
- B.
Spike
- C.
Noise
- D.
Blackout
- 2.What power line fault category is symptomatic of a total loss of utility power?
- A.
Sag
- B.
Spike
- C.
Noise
- D.
Blackout
- 3.What power line fault category is more typically referred to as electromagnetic interference (EMI) and radio frequency interference (RFI)?
- A.
Sag
- B.
Spike
- C.
Noise
- D.
Blackout
- 4.What type of uninterruptible power supply (UPS) has traditionally been referred to as “offline” by technicians?
- A.
Passive standby
- B.
Line interactive
- C.
Double conversion
- D.
Ferro resonant standby
- 5.What type of uninterruptible power supply (UPS) uses a transformer or inductor between the utility power source and the load to correct or filter some variations in input power?
- A.
Passive standby
- B.
Line interactive
- C.
Double conversion
- D.
Ferro resonant standby
- 6.How many phases of generator power are usually required for industrial and commercial applications?
- A.
Single
- B.
Double
- C.
Three
- D.
Four
- 7.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
- 8.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
- 9.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
- 10.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
- 11.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
- 12.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
- 13.A 5 kilohertz (kHz) modulating signal has enough peak voltage to cause a deviation of 15 kHz. What is the modulation index?
- A.
5
- B.
3
- C.
0.5
- D.
0.3
- 14.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
- 15.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
- 16.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
- 17.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
- 18.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
- 19.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
- 20.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
- 21.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
- 22.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
- 23.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
- 24.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”
- 25.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
- 26.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
- 27.Which type of cable is the hardest to splice?
- A.
Multimode graded-index fiber
- B.
Multimode step index fiber
- C.
Unshielded twisted pair
- D.
Single mode fiber
- 28.A short section of single fiber cable that has a connector at each end is called a
- A.
Pigtail
- B.
Jumper
- C.
Patch cord
- D.
Breakout cables
- 29.What allows transportation of all active virtual LANs (VLAN) between switches using a single physical link?
- A.
Trunks
- B.
Frames
- C.
Links
- D.
Ports
- 30.Which device has multiport connectivity that directs data between nodes on a network?
- A.
Bridge
- B.
Router
- C.
Gateway
- D.
Repeater
- 31.Which routing protocol do Internet backbones use?
- A.
Option 1
- B.
Option 2
- C.
Option 3
- D.
Option 4
- 32.Which routing protocol do Internet backbones use?
- A.
Open shortest path first (OSPF)
- B.
Border gateway protocol (BGP)
- C.
Routing information protocol (RIP)
- D.
Enhanced interior gateway routing protocol (EIGRP)
- 33.Virtual private networks (VPNs) allow the AF to extend network resources across a/an
- A.
Department of Defense network
- B.
Air Force network
- C.
Local area network
- D.
Public network
- 34.Which of the following is not a function that a virtual private network (VPN) concentrator performs?
- A.
Manages data transfer across the tunnel
- B.
Encrypts and decrypts data
- C.
Establishes tunnels
- D.
Encapsulates data
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