1. Which
of the following signal is not standard RS-232-C signal?
(A) VDR (B)
RTS
(C) CTS (D)
DSR
Answer: A
2. Which
of the following statement is incorrect?
(A) Multiplexers are designed to accept data
from several I/O devices and transmit a unified stream of data on one
communication line
(B) HDLC is a standard synchronous
communication protocol.
(C) RTS/CTS is the way the DTE indicates that
it is ready to transmit data and the way the DCW indicates that it is ready to
accept data
(D) RTS/CTS is the way the terminal indicates
ringing
Answer: D
3. In
a synchronous modem, the digital-to-analog converter transmits signal to the
................
(A) equalizer (B)
modulator
(C) demodulator (D) terminal
Answer: A
4. Which
of the following communications lines is best suited to interactive processing
applications?
(A) narrow band channel (B) simplex lines
(C) full duplex lines (D) mixed band channels
Answer: C
5. A
band is always equivalent to ...............
(A) a byte (B)
a bit
(C) 100 bits (D)
none of these
Answer: D
6. The
loss in signal power as light travels down the fiber is called ...............
(A) attenuation (B) propagation
(C) scattering (D) interruption
Answer: A
7. Avalanche
photodiode receivers can detect bits of transmitted data by receiving
(A) 100 photons (B) 200 photons
(C) 2000 photons (D) 300 photons
Answer: B
8. Communication
circuits that transmit data in both directions but not at the same time are
operating in
(A) a simplex mode (B) a half duplex mode
(C) a full duplex mode (D) an asynchronous mode
Answer: B
9. An
example of a medium speed, switched communications service is .................
(A) series 1000 (B) data phone 50
(C) DDD (D)
All of the above
Answer: C
10. Which
layer in the ATM protocol has a 53 byte cell as an end product?
(A) Physical (B)
ATM
(C) Application adaptation (D) Cell transformation
Answer: A
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