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
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
18. The most likely type of modulation to be used in motor speed control is
(a) PAM
(b) PPM
(c) PWM
(d) QAM
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
20. PAM stands for
(a) pulse and modulator
(b) peripheral analog modulators
(c) pulse amplitude modulation
(d) protocol and modulation
21. A PMW uses
(a) differentiators
(b) rectifiers
(c) flip-flops
(d) both (a) and (b)
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
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
24. Which of the following is an encoding technique?
(a) PAM
(b) ASK
(c) FSK
(d) PSK
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
26. PCI is the acronym for
(a) peripheral controller interface
(b) peripheral computer interface
(c) protocol compatible interface
(d) peripheral component interconnect
27. In a PCI system, the individual paths from switch to peripherals are called
(a) pipes
(b) lanes
(c) highways
(d) channels
28. The following is not a classification of USB:
(a) low-speed
(b) full-speed
(c) high-speed
(d) intermediate speed
29. A 3.0 USB cable contains
(a) two twisted pairs
(b) one twisted pair
(c) three twisted pairs
(d) two straight wires
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