Online Questions and Answers Topic Outline
- MCQs in Bit and and Binary Transmission
- MCQs in Signaling Rate
- MCQs in Error Probability, Digital Filtering, Switching, Packet Circuit, Vertical Circuit
- MCQs in Open systems Interconnection
- MCQs in Multiplying, Modulation and Synchronization
- MCQs in Pulse Code Modulation, Companding, Encoding, Bandwidth and Signal to Noise Ratio
- MCQs in Delta Modulation, Slope Overload, Adaptive Delta Modulation, Codes and Protocol
- MCQs in Error Detection and Correction, Digital Carrier systems
- MCQs in Frequency Shift Keying, Phase Shift Keying, Differential Phase Shift keying
- MCQs in DC nature of data transmission, loops, Neutral and Polar
- MCQs in Binary transmission and the concept of time
- MCQs in Asynchronous and Synchronous, timing, Distortion, Bits, band, WPM
- MCQs in Data Interface standards, Data input/output devices
- MCQs in Digital Transmission on analog channel, Modulation-demodulation schemes parameters
- MCQs in Circuit conditioning, Modem Applications
- MCQs in Serial and Parallel Transmission
MCQs in Digital and Data Communication Networks Series
Following is the list of multiple choice questions in this brand new series:
Continue Practice Exam Test Questions Part VII of the Series
301. A convenient technique for determining the effects of the degradations introduced into the pulses as they travel to the regenerator.
- A. Standing wave ratio
- B. Eye patterns
- C. Reflection coefficient
- D. Any of these
302. Spread spectrum stations sharing a band are identified by and distinguished from one another
- A. PSN code
- B. Frequency of operation
- C. Clock rate
- D. Modulation type
303. The ASCII code has
- A. 4 bits
- B. 5 bits
- C. 7 bits
- D. 8 bits
304. The first file transfer protocol designed to facilitate transferring data between two personal computers over the public switched telephone network
- A. X modem protocol
- B. Y modem protocol
- C. Z modem protocol
- D. BLAST
305. For a single-channel PCM system with a sample rate of 6000 samples per second and a seven-bit compressed PCM code, what is the line speed?
- A. 21,000 bps
- B. 42,000 bps
- C. 14,000 bps
- D. 12,000 bps
306. It is often used to compare the performance of one digital modulation technique to another
- A. Bandwidth efficiency
- B. Spectral efficiency
- C. Information density
- D. All of these
307. It is the process of extracting a phase-coherent reference carrier from a receiver signal
- A. Phase referencing
- B. Trellis code
- C. Squaring loop
- D. any of these
308. It is the measure of how much information can be propagated through a communication system and is a function of a bandwidth of the transmission line
- A. information theory
- B. information capacity
- C. information technology
- D. digital communications
309. In delta modulation, the modulator is sometimes called _____.
- A. continuous ADC
- B. tracking ADC
- C. variable slope ADC
- D. slope ADC
310. The code which provides for parity checks is
- A. Baudot
- B. ASCII
- C. CCITT-2
- D. EBCDIC
311. Form of multiplexing that constitutes propagating signals from different cables that sre contained within the same trench
- A. Wavelength division multiplexing
- B. Wave division multiplexing
- C. Space division multiplexing
- D. Frequency division multiplexing
312. For an 8-PSK system, operating with an information bit rate of 24 kbps, determine the bandwidth efficiency
- A. 8 bits/cycle
- B. 2 bits/cycle
- C. 3 bits/cycle
- D. 4 bits/cycle
313. Element of a PCM system that periodically samples the analog input signal and converts those samples to a multilevel PAM signal
- A. Bandpass filter
- B. Sample-and-hold circuit
- C. Analog-to-digital converter
- D. Digital-to-analog converter
314. It is the ratio of the average carrier power to the thermal noise power
- A. Signal-to-noise ratio
- B. Noise figure
- C. Noise factor
- D. Carrier-to-noise ratio
315. A form of switching which is hold and forward
- A. Packet switching
- B. Message switching
- C. Circuit switching
- D. Digital switching
316. It can be used to categorize the type of transmission
- A. Duty cycle
- B. Companding
- C. Coding efficiency
- D. Dynamic range
317. Type of multiplexing where multiple sources that originally occupied the same frequency spectrum are each converted to a different frequency band and transmitted simultaneously over a single transmission medium.
- A. FDM
- B. ATM
- C. TDM
- D. Spread spectrum
318. It is a solicitation sent from the primary to a secondary to determine if the secondary has data to transmit
- A. Selection
- B. Polling
- C. Error control
- D. Master control
319. Function of data link control that specifies the means of detecting and correcting transmission errors
- A. Error control
- B. Selection
- C. Protocol
- D. Synchronization
320. The Hartley law states that
- A. the maximum rate of information transmission depends on the channel bandwidth
- B. the maximum rate of information depends on the depth of modulation
- C. redundancy is essential
- D. only binary codes may be used
321. It represents the number of independent symbols that can be carried through a system in a given unit of time.
- A. information theory
- B. information capacity
- C. information technology
- D. digital communications
322. The Shannon-Hartley law
- A. refers to distortion
- B. defines the bandwidth
- C. describes signaling rates
- D. refers to noise
323. The most basic digital symbol used to represent information
- A. bit
- B. baud
- C. bits per second
- D. any of these
324. Function of data link protocol that coordinates hop-to-hop data delivery where a hop maybe a computer, a network controller or a network-connecting device such as router.
- A. Flow control
- B. Error control
- C. Line discipline
- D. Selection
325. Quadrature amplitude modulation is
- A. Amplitude modulation only
- B. QPSK only
- C. AM plus QPSK
- D. AM plus FSK
326. The most common modulation system used for telegraphy is
- A. frequency-shift keying
- B. two-tone modulation
- C. pulse-code modulation
- D. single-tone modulation
327. It is used to encode the minimum amount of speech information necessary to reproduce a perceptible message with a fewer bits that those needed by a conventional encoder/decoder
- A. codec
- B. muldem
- C. vocoders
- D. modem
328. It is the transmission of information in any form from one source to one or more destination
- A. Modulation
- B. Multiplexing
- C. Encoding
- D. Decoding
329. A form of switching which is stored and forward
- A. Packet switching
- B. Message switching
- C. Circuit switching
- D. Digital switching
330. In digital modulation, it is similar to standard amplitude modulation except there is only two amplitudes possible
- A. frequency shift keying
- B. quaternary amplitude modulation
- C. amplitude shift keying
- D. phase shift keying
331. The technique of using modulation and FDM to transmit multiple data channels of a common medium is known as
- A. baseband
- B. broadband
- C. ring
- D. bus
332. Which of the following is not a benefit of companding
- A. minimizes noise
- B. minimizes number of bits
- C. minimizes quantizing error
- D. minimizes signal bandwidth
333. Transmissions from multiple sources occur in the same facility but not at the same time
- A. Time Division Multiplexing
- B. Frequency Division Multiplexing
- C. Wave Division Multiplexing
- D. Space Division Multiplexing
334. A 9600-baud rate signal can pass over the voice grade telephone line if which kind of modulation is used?
- A. BPSK
- B. QPSK
- C. DPSK
- D. QAM
335. Indicate which of the following pulse modulation systems is analog
- A. PCM
- B. PWM
- C. Differential PCM
- D. Delta
336. The modulation system inherently most noise-resistant is
- A. SSB, suppressed carrier
- B. frequency modulation
- C. pulse-position modulation
- D. pulse-code modulation
337. It is simply the number of bits transmitted during one second and expressed in bits per second
- A. baud
- B. bits
- C. bit rate
- D. pulse repetition rate
338. It is the most prevalent encoding technique used for TDM signals
- A. PAM
- B. PLM
- C. PPM
- D. PCM
339. The characters making up the message in a synchronous transmission are collectively referred to as the data
- A. set
- B. sequence
- C. block
- D. collection
340. A virtual circuit which is logically equivalent to a two-point dedicated private-line circuit except slower
- A. Switched Virtual Circuit
- B. Permanent Virtual Circuit
- C. Switched Leased Circuit
- D. Permanent Leased Circuit
341. To a conventional narrowband receiver, a spread spectrum signal appears to be like
- A. Noise
- B. Fading
- C. A jamming signal
- D. An intermittent connection
342. It is a low-quality video transmission for use between non-dedicated subscribers
- A. Digital phone
- B. Picturephone
- C. Cameraphone
- D. Cellphone with camera
343. Pulse code modulation is preferred to PAM because of its
- A. resistance to quantizing error
- B. simplicity
- C. lower cost
- D. superior noise immunity
344. A CRC generator uses which component?
- A. balanced modulator
- B. shift register
- C. binary adder
- D. multiplexer
345. A signaling element is sometimes called
- A. information
- B. data
- C. symbol
- D. intelligence
346. Which of the following words has the correct parity bit? Assume odd parity. The last bit is the parity bit.
- A. 1111111 1
- B. 1100110 1
- C. 0011010 1
- D. 0000000 0
347. It is a digital interface that provides the physical connection to the digital carrier network
- A. Modem
- B. Codec
- C. Muldem
- D. DSU/CSU
348. It is the only digitally encoded modulation technique that is commonly used for digital transmission
- A. PAM
- B. PCM
- C. PLM
- D. PPM
349. The most common circuit used for demodulating binary FSK signals
- A. phase locked loop
- B. Foster-Seeley discriminator
- C. varactor
- D. phase shift method
350. A digital modulation technique also known as “on-off” keying
- A. PSK
- B. FSK
- C. QUAM
- D. OOK
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