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ECE :: Digital Electronics

  1. A flip flop is a

  2. A.
    combinational circuit
    B.
    memory element
    C.
    arithmetic element
    D.
    memory or arithmetic element

  3. A 4 bit parallel type A/D converter uses a 6 volt reference. How many comparators are required and what is the resolution in volts?

  4. A.
    0.375 V
    B.
    15 V
    C.
    4.5 V
    D.
    10 V

  5. Quantization error occurs in

  6. A.
    D/A converter
    B.
    A/D converter
    C.
    both D/A and A/D converter
    D.
    neither D/A nor A/D converter

  7. Which of these are universal gates?

  8. A.
    Only NOR
    B.
    Only NAND
    C.
    Both NOR and NAND
    D.
    NOR, NAND, OR

  9. Out of latch and flip flop, which has clock input?

  10. A.
    Latch only
    B.
    Flip flop only
    C.
    Both latch and flip flop
    D.
    None

  11. A mod 4 counter will count

  12. A.
    from 0 to 4
    B.
    from 0 to 3
    C.
    from any number n to n + 4
    D.
    none of the above

  13. In the given figure shows a 4 bit serial in parallel out right shift register. The initial contents as shown are 0110. After 3 clock pulses the contents will be

  14. A.
    0000
    B.
    0101
    C.
    1010
    D.
    1111

  15. Which of the following finds application in pocket calculators?

  16. A.
    TTL
    B.
    CMOS
    C.
    ECL
    D.
    Both (a) and (c)