DipIETE
– ET (OLD SCHEME)
NOTE: There are 9 Questions in all.
· Question 1 is
compulsory and carries 20 marks. Answer to Q.1 must be written in the space
provided for it in the answer book supplied and nowhere else.
· Out of the
remaining EIGHT Questions, answer any FIVE Questions. Each question carries 16
marks.
· Any required data
not explicitly given, may be suitably assumed and stated.
Q.1 Choose the correct or the best alternative in the following: (210)
a.
The decimal equivalent of Hex number 1A53 is __________.
(A)
6793 (B)
6739
(C)
6973 (D) 6379
b. The simplification of the Boolean expression + is _________.
(A)
0 (B) 1
(C) A (D) BC
c. De
Morgan’s first theorem shows the equivalence of
(A)
NOR Gate and AND Gate.
(B)
NAND Gate and AND Gate.
(C) NOR Gate and Bubbled AND Gate.
(D) NAND Gate and Bubbled.
d. The
fastest of all logic families is __________.
(A) TTL (B) ECL
(C) CMOS (D) RTL
e. A
Ring Counter consists of Five Flip-Flops will have __________.
(A)
32 states (B) 5
states
(C) 16 states (D) 10 states
f. The
gates required to build a Half-adder logic circuit are _________.
(A)
EX-OR Gate and OR Gate
(B)
OR Gate and AND Gate
(C) EX-OR Gate and AND Gate
(D) EX-OR Gate and EX-OR Gate
g. If
the input to a T Flip-Flop is 100 Hz signal, then the final output of the three
T Flip-Flops in cascade is _________.
(A) 100 Hz (B) 22.5 Hz
(C) 50 Hz (D)
12.5 Hz
h. EPROM
contents can be erased by exposing it to __________.
(A)
ultraviolet rays (B) infrared rays
(C) burst of microwaves (D)
intense heat radiations
i. The
A/D converter which has maximum speed of conversion is _________.
(A) Successive Approximation (B) Parallel Comparator
(C) Dual Slop (D) Counting
Type
j. A device which converts BCD to Seven Segment
is called
(A) Multiplexer. (B) Encoder.
(C) Decoder. (D) Demultiplexer.
Answer any FIVE
Questions out of EIGHT Questions.
Each question
carries 16 marks.
Q.2 a. (i) Convert
the Decimal number 82.67 to its Binary Equivalent. (3)
(ii)
Convert the binary equivalent of
decimal number 82.67 into
Hexadecimal.
(3)
(iii)
Convert the binary equivalent of
decimal number 82.67 into Octal number. (3)
b.
(i) Perform the Addition of 20 and (–15) using
2’s Complement. (4)
(ii) Convert
the Decimal number 430 to Excess-3 code. (3)
Q.3 a. What
are universal gates? Realize the AND and OR gates using NAND gate. (6)
c. Prove the following equations using Boolean
Algebraic Theorems: (4+6)
(i)
(ii)
Q.4 a. Minimize the logic function F(A, B, C, D) =
∑ m(1,3,5,8,9,11,15) + d(2,13) using K-maps and realize the simplified
logic function using NAND gates only. (9)
b. What are the advantages
of CMOS Logic? Explain the operation of CMOS Inverter with the help of logic diagram. (7)
Q.5 a. What
is a Full-adder? Explain a full-adder with the help of truth-table and logic
diagram. (9)
b. What is an Encoder? Explain Decimal to BCD
Encoder with the help of truth-table and logic diagram. (7)
Q.6 a. What
is a Shift Register? What are its various types? List out their applications. (4)
b. What
are Synchronous Counters? Design a MOD-5 Synchronous counter using J-K
Flip-Flops. (12)
Q.7 a. Differentiate between ROM, PROM, EPROM, UV
EPROM, EEPROM. (6)
b. Using a suitable logic
diagram explain the operation of 16-bit ROM Array. (10)
Q.8 a. With
the help of R-2R binary ladder, explain the working of a 4-bit D/A converter. (12)
b. A 6 bit R-2R ladder D/A converter has a reference
voltage of 5 V. It meets standard linearity.
Find:
(i) The resolution in percent and
(ii) The output
voltage for 011100. (4)
Q.9 a. Design a 4 to 1 Multiplexer by using the
three variable function given by
F(A,B,C)=∑m(1,3,5,6) (9)
b. What
is a Flip-Flop? Mention its various applications. (3)
c. Find the conversion time of a successive
approximation A/D converter which uses a 2 MHz clock and a 5 bit
binary ladder containing 8 V reference.
Also find out its conversion Rate. (4) . (8)