Q.61 If a modem packs six bits into each signal change and operates at 14,400 bps, it can result in a maximum throughput of.
(A) 2400 bps
(B) 4800 bps
(C) 9600 bps
(D) 14 400 bps
Exam Based History GK Questions: exam-based-history-gk-questions-of-gupta-empire
Q.62 A bipolar violation.
(A) represents a zero-bit followed by one bit.
(B) occurs when two successive pulses have the same polarity and are separated by a zero level.
(C) occurs when two successive pulses have the same polarity and are separated by one level.
(D) represents one bit followed by a zero bit.
Q.63 On a digital circuit, the absence of a transmitted signal.
(A) has no effect on equipment
(B) occurs when a DTE has no data transmit.
(C) is compensated for by the transmission of intentional bipolar violations to maintain equipment clocking.
(D) occurs only after 9 p.m.
Q.64 Multiplexing is….
(A) the process of increasing bandwidth on a channel.
(B) a technique that enables more than one data source to share the use of a common line.
(C) mailing letters at the Post Office.
(D) the capability to share frequency by time.
Q.65 Frequency division multiplexing has essentially been replaced by time division multiplexing is because….
(A) there is more time than frequency.
(B) it is difficult to place channels side by side.
(C) noise is amplified with voice when an FDM system is used.
(D) most available frequencies have been used.
Q.66 When the amplitude of pulses is varied to represent analog information, the method is called.
(A) PCM
(B) PWM
(C) PAM
(D) PPM
Q. 67 PCM sampling rate is 8000 samples per second because…..
(A) that represents the maximum rate that technology supports.
(B) this rate allows unique values.
(C) this rate allows the faithful recon-traction of an analog signal.
(D) this rate is easily produced by a sampling chip.
Q.68 In general digital transmission provides a higher level of signal quality than angling transmission because….
(A) repeaters regenerate digital pulses and remove distortion, whereas amplifiers distortion to the signal.
(B) digital signals are smaller than analog signals and cannot be easily distorted.
(C) analog signals are continuous and are not easily distorted.
(D) the digital signal is easier to sample than analog signals.
Q.69 The D4 framing pattern contains a sequence of ….
(A) 24 bits
(B) 4 terminals and 8 framing bits.
(C) 8 terminals and 4 framing bits.
(D) 12 bits
Q.70 Bipolar signaling is used in place of unipolar signaling on T lines because….
(A) bipolar signaling produces twice as many marks as a unipolar signal.
(B) it allows transmission at polar locations.
(C) bipolar signaling reduces residual DC voltage buildup, allowing a digital signal to be separated from power through the use of a transformer.
(D) it allows transformers to be spaced far from one another, which reduces the cost of transmission.
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