MCQ EX-403/DELD
Q1. The binary number 10101 is equivalent to decimal number …………..
19
12
27
21
Answer : 4
Q2. The universal gate is ………………
NAND gate
OR gate
AND gate
None of the above
Answer : 1
Q3. The inverter is ……………
NOT gate
OR gate
AND gate
None of the above
Answer : 1
1
Q4. The inputs of a NAND gate are connected together. The resulting circuit is ………….
OR gate
AND gate
NOT gate
None of the above
Answer : 3
Q5. The NOR gate is OR gate followed by ………………
AND gate
NAND gate
NOT gate
None of the above
Answer : 3
Q6. The NAND gate is AND gate followed by …………………
NOT gate
OR gate
AND gate
None of the above
Answer : 1
Q7. Digital circuit can be made by the repeated use of ………………
OR gates
NOT gates
NAND gates
None of the above
2
Answer : 3
Q8. The only function of NOT gate is to ……………..
Stop signal
Invert input signal
Act as a universal gate
None of the above
Answer : 2
Q9. When an input signal 1 is applied to a NOT gate, the output is ………………
Either 0 & 1
None of the above
Answer : 1
Q10. In Boolean algebra, the bar sign (-) indicates ………………..
OR operation
AND operation
NOT operation
None of the above
Answer : 3
Q11. The resolution of an n bit DAC with a maximum input of 5 V is 5 mV. The value of n is …….
10
3
11
Answer : 3
Q12. 2’s complement of binary number 0101 is ………..
1011
1111
1101
1110
Answer : 1
Q13. An OR gate has 4 inputs. One input is high and the other three are low. The output is …….
Low
High
Alternately high and low
May be high or low depending on relative magnitude of inputs
Answer : 2
Q14. Decimal number 10 is equal to binary number ……………
1110
1010
1001
1000
Answer : 2
Q15. Both OR and AND gates can have only two inputs.
True
False
Answer : 2
4
Q16. A device which converts BCD to seven segments is called ……..
Encoder
Decoder
Multiplexer
None of these
Answer : 2
Q17. In 2’s complement representation the number 11100101 represents the decimal number ……………
+37
-31
+27
-27
Answer : 4
Q18. A decade counter skips ………..
Binary states 1000 to 1111
Binary states 0000 to 0011
Binary states 1010 to 1111
Binary states 1111 to higher
Answer : 3
Q19. 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 ………….
A, b, d
A, b, c
All
A, b, g, c, d
Answer : 3
5
Q20. A ring counter with 5 flip flops will have .......... States.
10
32
Infinite
Answer : 1
Q21. For the gate in the given figure the output will be ………..
Answer : 4
Q22. In the expression A + BC, the total number of minterms will be ………
Answer : 4
Q23. The circuit in the given figure is a ............ gate.
Positive logic OR gate
Negative logic OR gate
Negative logic AND gate
Positive logic AND gate
Answer : 2
6
24. Which of the following is non-saturating?
TTL
CMOS
ECL
Both 1 and 2
Answer : 3
Q25. The number of digits in octal system is ………
10
Answer : 1
Q26. 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 ………
9.5 ns
14.5 ns
20 ns
95 ns
Answer : 2
Q27. The expression Y = pM (0, 1, 3, 4) is …………..
POS
SOP
Hybrid
None of these
7
Answer : 1
Q28. 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 ………….
994 to 1014 μA
990 to 1020 μA
800 to 1200 μA
None of the above
Answer : 1
29. Decimal 43 in hexadecimal and BCD number system is respectively……. And ……..
B2 and 01000011
2B and 01000011
2B and 00110100
B2 and 01000100
Answer : 2
Q30. An AND gate has two inputs A and B and one inhibit input 3, Output is 1 if
A = 1, B = 1, S = 1
A = 1, B = 1, S = 0
A = 1, B = 0, S = 1
A = 1, B = 0, S = 0
Answer: 2
Q31. The greatest negative number which can be stored is 8 bit computer using 2’s complement
arithmetic is ……..
-256
-128
-255
-127
8
Answer: 2
Q32. 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 ……..
16
64
128
256
Answer: 4
Q33. The basic storage element in a digital system is ………….
Flipflop
Counter
Multiplexer
Encoder
Answer : 1
Q34. In a ripple counter,
Whenever a flipflop sets to 1, the next higher FF toggles
Whenever a flipflop sets to 0, the next higher FF remains unchanged
Whenever a flipflop sets to 1, the next higher FF faces race condition
Whenever a flipflop sets to 0, the next higher FF faces race condition
Answer : 1
Q35. A 12 bit ADC is used to convert analog voltage of 0 to 10 V into digital. The resolution is ……….
2.44 mV
24.4 mV
1.2 V
None of these
9
Answer : 1
Q36. A full adder can be made out of …………
Two half adders
Two half adders and a OR gate
Two half adders and a NOT gate
Three half adders
Answer : 2
Q37. The output of a half adder is ……….
Sum
Sum and Carry
Carry
None of these
Answer: 2
Q38. Minimum number of 2-input NAND gates required to implement the function F = (x + y) (Z + W) is
………..
Answer : 2
10
Q39. Which device has one input and many outputs?
Multiplexer
Demultiplexer
Counter
Flip flop
Answer: 2
Q40. A carry look ahead adder is frequently used for addition because
It costs less
It is faster
It is more accurate
Uses fewer gates
Answer: 2
11
