1.The binary number 10101 is equivalent to decimal number …………..
1. 19
2. 12
3. 27
4. 21
Answer : 4
2.The inverter
is ……………
1. NOT gate
2. OR gate
3. AND gate
4. None of the above
Answer
: 1
3.
The inputs of a NAND gate are connected together. The resulting circuit is
………….
1. OR gate
2. AND gate
3. NOT gate
4. None of the above
Answer
: 3
4.The
NOR gate is OR gate followed by ………………
1. AND gate
2. NAND gate
3. NOT gate
4. None of the above
Answer
: 4
5.The universal gate is ………………
1. NAND gate
2. OR gate
3. AND gate
4. None of the above
Answer
: 1
6.Digital
circuit can be made by the repeated use of ………………
1. OR gates
2. NOT gates
3. NAND gates
4. None of the above
Answer
: 3
7.The
only function of NOT gate is to ……………..
1. Stop signal
2. Invert input signal
3. Act as a universal gate
4. None of the above
Answer
: 2
8.When
an input signal 1 is applied to a NOT gate, the output is ………………
1. 0
2. 1
3. Either 0 & 1
4. None of the above
Answer
: 1
9.Digital
circuit can be made by the repeated use of ………………
1. OR gates
2. NOT gates
3. NAND gates
4. None of the above
Answer
: 3
10.The
only function of NOT gate is to ……………..
1. Stop signal
2. Invert input signal
3. Act as a universal gate
4. None of the above
Answer
: 2
11.When
an input signal 1 is applied to a NOT gate, the output is ………………
1. 0
2. 1
3. Either 0 & 1
4. None of the above
Answer : 1
12.In
Boolean algebra, the bar sign (-) indicates ………………..
1. OR operation
2. AND operation
3. NOT operation
4. None of the above
Answer
: 3
13.
The resolution of an n bit DAC with a maximum input of 5 V is
5 mV. The value of n is …….
1. 8
2. 9
3. 10
4. 11
Answer
: 3
14. 2’s
complement of binary number 0101 is ………..
1. 1011
2. 1111
3. 1101
4. 1110
Answer
: 1
14. An
OR gate has 4 inputs. One input is high and the other three are low. The output
is …….
1. Low
2. High
3. alternately high and low
4. may be high or low depending on relative magnitude
of inputs
Answer
: 2
15.. Decimal
number 10 is equal to binary number ……………
1. 1110
2. 1010
3. 1001
4. 1000
Answer
: 2
16. Both
OR and AND gates can have only two inputs.
1. True
2. False
Answer
: 2
17. A
device which converts BCD to seven segments is called ……..
1. Encoder
2. Decoder
3. Multiplexer
4. None of these
Answer
: 2
18.
In 2’s complement representation the number 11100101 represents the decimal
number ……………
1. +37
2. -31
3. +27
4. -27
Answer
: 4
19. A
decade counter skips ………..
1. binary states 1000 to 1111
2. binary states 0000 to 0011
3. binary states 1010 to 1111
4. binary states 1111 to higher
Answer
: 3
20. BCD
input 1000 is fed to a 7 segment display through a BCD to 7 segment
decoder/driver. The segments which will lit up are ………….
1. a, b, d
2. a, b, c
3. all
4. a, b, g, c, d
Answer
: 3
.
21. A
ring counter with 5 flip flops will have ………. states.
1. 5
2. 10
3. 32
4. Infinite
Answer
: 1
23.In
the expression A + BC, the total number of minterms will be ………
1. 2
2. 3
3. 4
4. 5
Answer
: 4
25. Which
of the following is non-saturating?
1. TTL
2. CMOS
3. ECL
4. Both 1 and 2
Answer
: 3
26. The number of digits in octal system is ………
1. 8
2. 7
3. 9
4. 10
Answer
: 1
27. The
access time of a word in 4 MB main memory is 100 ms. The access time of a word
in a 32 kb data cache memory is 10 ns. The average data cache bit ratio is
0.95. The efficiency of memory access time is ………
1. 9.5 ns
2. 14.5 ns
3. 20 ns
4. 95 ns
Answer
: 2
28. The
expression Y = pM (0, 1, 3, 4) is …………..
1. POS
2. SOP
3. Hybrid
4. none of these
Answer
: 1
29.An
8 bit DAC has a full scale output of 2 mA and full scale error of ± 0.5%. If
input is 10000000 the range of outputs is ………….
1. 994 to 1014 μA
2. 990 to 1020 μA
3. 800 to 1200 μA
4. none of the above
Answer
: 1
30. Decimal
43 in hexadecimal and BCD number system is respectively……. and ……..
1. B2 and 01000011
2. 2B and 01000011
3. 2B and 00110100
4. B2 and 01000100
Answer
: 2
1. A = 1, B = 1, S = 1
2. A = 1, B = 1, S = 0
3. A = 1, B = 0, S = 1
4. A = 1, B = 0, S = 0
Answer:
2
1. -256
2. -128
3. -255
4. -127
Answer:
2
A JK
flip flop has tpd= 12 ns. The largest modulus of a
ripple counter using these flip flops and operating at 10 MHz is ……..
1. 16
2. 64
3. 128
4. 256
Answer:
4
The
basic storage element in a digital system is ………….
1. flipflop
2. counter
3. multiplexer
4. encoder
Answer
: 1
In
a ripple counter,
1. whenever a flipflop sets to 1, the next higher FF
toggles
2. whenever a flipflop sets to 0, the next higher FF
remains unchanged
3. whenever a flipflop sets to 1, the next higher FF
faces race condition
4. whenever a flipflop sets to 0, the next higher FF
faces race condition
Answer
: 1
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