Discussion
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- Question
A counter type A/D converter contains a 4 bit binary ladder and a counter driven by a 2 MHz clock. Then conversion time
Options- A. 8 ? sec
- B. 10 ? sec
- C. 2 ? sec
- D. 5 ? sec
- Correct Answer
- 8 ? sec
Explanation
Digital Electronics problems
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- 1. The basic storage element in a digital system is
Options- A. flip flop
- B. counter
- C. multiplexer
- D. encoder Discuss
Correct Answer: flip flop
Explanation:
Storing can be done only in memory and flip-flop is a memory element.- 2. Minimum number of 2-input NAND gates required to implement the function F = (x + y) (Z + W) is
Options- A. 3
- B. 4
- C. 5
- D. 6 Discuss
Correct Answer: 4
Explanation:
F = (x + y) (z + w) = xy.(z + w)= xyz + xyw
=
minimum no. of 2 input NAND gate.
- 3. A decade counter skips
Options- A. binary states 1000 to 1111
- B. binary states 0000 to 0011
- C. binary states 1010 to 1111
- D. binary states 1111 to higher Discuss
Correct Answer: binary states 1010 to 1111
Explanation:
A decade counter counts from 0 to 9. It has 4 flip-flops. The states skipped are 10 to 15 or 1010 to 1111.- 4. A carry look ahead adder is frequently used for addition because
Options- A. it costs less
- B. it is faster
- C. it is more accurate
- D. is uses fewer gates Discuss
Correct Answer: it is faster
Explanation:
In look ahead carry adder the carry is directly derived from the gates when original inputs are being added. Hence the addition is fast. This process requires more gates and is costly.- 5. In the expression A + BC, the total number of minterms will be
Options- A. 2
- B. 3
- C. 4
- D. 5 Discuss
Correct Answer: 5
Explanation:
The min terms are ABC + ABC + AB C + ABC + ABC.- 6. Decimal 43 in hexadecimal and BCD number system is respectively.
Options- A. B2, 01000011
- B. 2B, 01000011
- C. 2B, 00110100
- D. B2, 01000100 Discuss
Correct Answer: 2B, 01000011
Explanation:
(43)10 = (2B)16(43)10 = (01000011)2 .
- 7. Decimal number 10 is equal to binary number
Options- A. 1110
- B. 1010
- C. 1001
- D. 1000 Discuss
Correct Answer: 1010
Explanation:
1010 = 8 + 2 = 10 in decimal.- 8. Which of the following is taken as reference antenna for directive gain?
Options- A. Half wave dipole
- B. Elementary doublet
- C. Isotropic
- D. Infinitesimal dipole Discuss
Correct Answer: Isotropic
Explanation:
Isotropic antenna is one which radiates equally in all directions. It is a standard reference antenna.- 9. The number of noise sources in a BJT are
Options- A. 3
- B. 2
- C. 1
- D. 4 Discuss
Correct Answer: 3
Explanation:
Shot noise, partition noise and thermal noise.- 10. An earth mat for a communication tower consists of
Options- A. one or two radials extending from base of tower at a depth of about 5 cm below ground
- B. a large number of radials extending from base of tower at a depth of about 3 m
- C. a large number of radials extending from base of tower at a depth of about 30 cm
- D. none of the above Discuss
Correct Answer: a large number of radials extending from base of tower at a depth of about 30 cm
Explanation:
The number of radials is large and depth is about 30 cm.
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