Chapter 2: Basic concepts

Multiple Choice:

1. In a ____ connection, more than two devices can share a single
link. [ ]
(a) point-to-point
(b) multipoint
(c) primary
(d) secondary

2. In _____ transmission, the channel capacity is shared by both [ ]
communicating devices at all times
(a) simplex
(b) half-duplex
(c) full-duplex
(d) None of these

3. A television broadcast is an example of _____ transmission [ ]
(a) simplex
(b) half-duplex
(c) full-duplex
(d) None of these

4. Communication between a computer and a keyboard [ ]
involves ______ transmission
(a) simplex
(b) half-duplex
(c) full-duplex
(d) None of these

5. Analog signals are characterized by [ ]
(a) amplitude and signal
(b) amplitude and frequency
(c) frequency and phase
(d) amplitude, frequency and phase

6. The amplitude of a signal [ ]
(a) increases with distance
(b) decreases with distance
(c) increases for the first 100 meters and then decreases
(d) does not change

7. The Spectrum analyser displays the same signal as a [ ]
function of
(a) frequency
(b) amplitude
(c) phase
(d) None of these

8. The bandwidth of a signal is the ______of its highest [ ]
and lowest frequency components
(a) difference
(b) sum
(c) multiple
(d) None of these

9. The bandwidth of a telephone channel is [ ]
(a) 0.3 to 3.4 KHz
(b) 0.2 to 20 KHz
(c) 4 KHz to 3 MHz
(d) not specified

10. In Nyquist theorem, B = 2H log2V, the term B specifies [ ]
(a) bit rate
(b) discrete signal levels
(c) bandwidth
(d) None of these.

11. In Nyquist theorem, B = 2H log2V, the term H specifies [ ]
(a) bit rate
(b) discrete signal levels
(c) bandwidth
(d) None of these.

12. In Nyquist theorem, B = 2H log2V, the term V specifies [ ]
(a) bit rate
(b) discrete signal levels
(c) bandwidth
(d) None of these.

13. The no. of transitions per second on a link is called [ ]
(a) bit rate
(b) baud rate
(c) burst rate
(d) jitter

14. The noise level is measured in [ ]
(a) watts
(b) db
(c) volts
(d) None of these

Key :
1. b 2. c 3. a 4. a 5. d 6. b 7. a 8. a 9. a 10. a 11. c 12. b
13. b 14. b