Data Transmission MCQs

16. In QAM, the parameters that are varied are

(a) amplitude and frequency

(b) phase and frequency

(c) amplitude and phase

(d) pulse width and position

Answer
Answer. c

17. Three methods for modulating a digital signal with analog data are

(a) PAM, PWM, PPM

(b) PAM, ASK, PPM

(c) FSK, QAM, PAM

(d) QAM, PAM, PWM

Answer
Answer. a

18. The most likely type of modulation to be used in motor speed control is

(a) PAM

(b) PPM

(c) PWM

(d) QAM

Answer
Answer. c

19. Pulse amplitude modulation makes use of

(a) a sample and hold circuit

(b) a successive approximator

(c) a dual-slope ADC

(d) an R/2R setup

Answer
Answer. a

20. PAM stands for

(a) pulse and modulator

(b) peripheral analog modulators

(c) pulse amplitude modulation

(d) protocol and modulation

Answer
Answer. c

21. A PMW uses

(a) differentiators

(b) rectifiers

(c) flip-flops

(d) both (a) and (b)

Answer
Answer. d

22. A certain number of data bits (D) are encoded by a single pulse in one of 2D possible positions during a specified fixed period (T ) in

(a) TDM

(b) PAM

(c) PPM

(d) PWM

Answer
Answer. c

23. Properties that define a bus include

(a) type of connectors
(b) length and type of cable or connection
(c) data rate and encoding
(d) all of these

Answer
Answer. d

24. Which of the following is an encoding technique?

(a) PAM

(b) ASK

(c) FSK

(d) PSK

Answer
Answer. a

25. The method used to transmit digital data from multiple sources over a single communication channel is called

(a) demultiplexing

(b) multiplexing

(c) encoding

(d) decoding

Answer
Answer. b

26. PCI is the acronym for

(a) peripheral controller interface

(b) peripheral computer interface

(c) protocol compatible interface

(d) peripheral component interconnect

Answer
Answer. d

27. In a PCI system, the individual paths from switch to peripherals are called

(a) pipes

(b) lanes

(c) highways

(d) channels

Answer
Answer. b

28. The following is not a classification of USB:

(a) low-speed

(b) full-speed

(c) high-speed

(d) intermediate speed

Answer
Answer. b

29. A 3.0 USB cable contains

(a) two twisted pairs

(b) one twisted pair

(c) three twisted pairs

(d) two straight wires

Answer
Answer. c

30. Four types of USB packets are

(a) token, data, handshake, and start-of-frame
(b) token, data, handshake, and control
(c) identification, address, synchronization, and data
(d) none of these

Answer
Answer. a