21.
Which of the following is false regarding the
evaluation of computer programming languages?
(A)
Application oriented features (B) Efficiency
and Readability
(C) Software
development (D) Hardware
maintenance cost
Answer: D
22. The
symmetric difference of two sets S1 and S2 is defined as
S1ΘS2
= {x|xϵS1 or xϵS2, but x is not in both S1 and
S2}
The nor of
two languages is defined as
nor (L1,L2)
= {w|w ∉ L1
and w|w ∉ L2}
Which of the
following is correct?
(A) The
family of regular languages is closed under symmetric difference but not closed
under nor.
(B) The
family of regular languages is closed under nor but not closed under symmetric
difference.
(C) The
family of regular languages are closed under both symmetric difference and nor.
(D) The family
of regular languages are not closed under both symmetric difference and nor.
Answer: C
23. The
regular expression for the complement of the language L = {anbm|n≥4, m≤3} is:
(A) (λ + a +
aa + aaa)b* + a*bbbb* + (a + b)*ba(a + b)*
(B) (λ + a +
aa + aaa)b* + a*bbbbb* + (a + b)*ab(a + b)*
(C) (λ + a +
aa + aaa) + a*bbbbb* + (a + b)*ab(a + b)*
(D) (λ + a +
aa + aaa)b* + a*bbbbb* + (a + b)*ba(a + b)*
Answer: D
24. Consider
the following two languages:
L1
= {0i1j | gcd(i,j)=1}
L2
is any subset of 0*.
Which of the
following is correct?
(A) L1
is regular and L2* is not regular
(B) L1
is not regular and L2* is regular
(C) Both L1
and L2* are regular languages
(D) Both L1
and L2* are not regular languages
Answer: B
25. If
link transmits 4000 frames per second and each slot has 8 bits, the
transmission rate of circuit of this TDM is ...............
(A) 64 Kbps (B) 32 Mbps
(C) 32 Kbps (D) 64 Mbps
Answer: C
26. Given
the following statements:
(a)
Frequency Division Multiplexing is a technique that can be applied when the
bandwidth of a link is greater than combined bandwidth of signals to be
transmitted.
(b) Wavelength
Division Multiplexing (WDM) is an analog multiplexing Technique to combine
optical signals.
(c) WDM is a
Digital Multiplexing Technique.
(d) TDM is a
Digital Multiplexing Technique.
Which of the
following is correct?
(A) (a),
(b), (c) and (d) are true.
(B) (a),
(b), (c) and (d) are false.
(C) (a), (b)
and (d) are false; (c) is true.
(D) (a), (b)
and (d) are true; (c) is false.
Answer: D
27. A
pure ALOHA Network transmit 200 bit frames using a shared channel with 200 Kbps
bandwidth. If the system (all stations put together) produces 500 frames per
second, then the throughput of the system is ..............
(A) 0.384 (B) 0.184
(C) 0.286 (D) 0.586
Answer: B
28. Match
the following:
(a) Line
coding (i) A
technique to change analog signal to digital data.
(b) Block
coding (ii) Provides
synchronization without increasing
number
of bits
(c)
Scrambling (iii) Process of converting digital
data to digital signal.
(d) Pulse
code modulation (iv) Provides
redundancy to ensure synchronization
and
inherits error detection.
Codes:
(a) (b) (c)
(d)
(A) (iv) (iii) (ii) (i)
(B) (iii) (iv) (ii)
(i)
(C) (i) (iii) (ii) (iv)
(D) (ii) (i) (iv)
(iii)
Answer: B
29. Assume
that we need to download text documents at the rate of 100 pages per minute. A
page is an average of 24 lines with 80 characters in each line and each
character requires 8 bits. Then the required bit rate of the channel is
................
(A) 1.636
Kbps (B) 1.636 Mbps
(C) 2.272
Mbps (D) 3.272 Kbps
Answer: Marks given to all
30. Encrypt
the plain text Message “EXTRANET” using Transposition cipher technique with the
following key:
3
|
5
|
2
|
1
|
4
|
(Cipher
text)
|
1
|
2
|
3
|
4
|
5
|
(Plain
text)
|
Using ‘Z’ as
bogus character.
(A)
TAXERTZENZ (B)
EXTRANETZZ
(C)
EZXZTRZANZET (D) EXTZRANZETZ
Answer: A
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