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ECE :: Digital Electronics

  1. A voltage DAC is generally slower than current DAC

  2. A.
    because of more accuracy
    B.
    because of higher resolution
    C.
    because of response time of op-amp current to voltage converter
    D.
    none of the above

  3. The circuit realizes the function

  4. A.
    (A + B) E + CD
    B.
    (A + B) (E + CD)
    C.
    (A + B) (E + C + D)
    D.
    (AB + E). CD

  5. For a NAND SR latch of input is the normal resting state of inputs is

  6. A.
    S = R = 1
    B.
    S = 0, R = 1
    C.
    S = 1, R = 0
    D.
    S = R = 0

  7. A mod-2 counter followed by a mod 5 is same as

  8. A.
    mod-7 counter
    B.
    A decade counter
    C.
    mod-3 counter
    D.
    none

  9. The write cycle time of memory is 200 nsec. The maximum rate of data which can be stored is

  10. A.
    200 words/sec
    B.
    5 x 103 words/sec
    C.
    5 x 106 word/sec
    D.
    5 x 109 words/sec

  11. Decimal 45.15 when converted into 9's complement will become

  12. A.
    54.84
    B.
    45.48
    C.
    48.54
    D.
    45.84

  13. Binary number 11011.01 when converted to its 2's complement will become

  14. A.
    0101.110
    B.
    01111.10
    C.
    01100.10
    D.
    00100.11

  15. A five bit binary adder is used to add 01001 and 00111. The adders from LSB position are numbered as FA0, FA1, FA2 and FA3. The outputs of FA2 are

  16. A.
    SUM = 0
    B.
    SUM = 0, CARRY = 1
    C.
    SUM = 1, CARRY = 0
    D.
    SUM = 1, CARRY = 1

  17. The values of 25 in octal system is

  18. A.
    40
    B.
    20
    C.
    400
    D.
    200

  19. As compared to MOS memories, bipolar memories have

  20. A.
    slower access time but are cheaper
    B.
    slower access time and are costly
    C.
    faster access time and are cheaper
    D.
    faster access time and are costly