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ECE :: Digital Electronics

  1. A multiple emitter transistor has many emitters and collectors.

  2. A.
    True
    B.
    False

  3. A mode-10 counter can divide the clock frequency by a factor of

  4. A.
    10
    B.
    100
    C.
    1000
    D.
    10000

  5. Which of the following binary numbers is equivalent to decimal 10?

  6. A.
    1000
    B.
    1100
    C.
    1010
    D.
    1001

  7. A 4 bit synchronous counter has flip flops having propagation delay of 50 ns each and AND gates having propagation delay of 20 ns each. The maximum frequency of clock pulses can be

  8. A.
    20 MHz
    B.
    50 MHz
    C.
    14.3 MHz
    D.
    5 MHz

  9. A counter has 4 flip flops. It divides the input frequency by

  10. A.
    4
    B.
    2
    C.
    8
    D.
    16

  11. A pulse train with a 1 MHz frequency is counted using a 1024 modulus ripple counter using JK flip flops. The maximum propagation delay for each flip-flop should be

  12. A.
    1 μs
    B.
    0.5 μs
    C.
    0.2 μs
    D.
    0.1 μs

  13. What will be maximum input that can be converted for a 6 bit dual slope A/D converter uses a reference of -6v and a 1 MHz clock. It uses a fixed count of 40 (101000).

  14. A.
    9 V
    B.
    9.45
    C.
    10 V
    D.
    8 V

  15. In the given figure shows a logic circuit. The minimum Boolean expression for this circuit is

  16. A.
    A + B
    B.
    A + B + C
    C.
    AB + C
    D.
    AB + AC + BC

  17. If number of information bits is 11, the number of parity bits in Hamming code is

  18. A.
    5
    B.
    4
    C.
    3
    D.
    2

  19. The number of digit 1 present in the binary representation of 3 x 512 + 7 x 64 + 5 x 8 + 3 is

  20. A.
    8
    B.
    9
    C.
    10
    D.
    12