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ECE :: Digital Electronics

  1. In a JK flip flop toggle means

  2. A.
    set Q = 1 and Q = 0
    B.
    set Q = 0 and Q = 1
    C.
    change the output to the opposite state
    D.
    no change in output

  3. How many flag are there in 8085 microprocessor?

  4. A.
    4
    B.
    5
    C.
    6
    D.
    8

  5. A microcomputer has a 64 K memory. What is the hexadecimal notation for the first memory location?

  6. A.
    0000
    B.
    FFFF
    C.
    0FFF
    D.
    3FFF

  7. Binary 101010 is equivalent to decimal number

  8. A.
    24
    B.
    42
    C.
    44
    D.
    64

  9. Each cell of a static RAM has

  10. A.
    4 MOS transistors
    B.
    4 MOS transistors and 2 capacitors
    C.
    2 MOS transistors and two capacitors
    D.
    1 MOS transistor and 1 capacitor

  11. The clear data and present input of the JK flip-flop are known as

  12. A.
    direct inputs
    B.
    synchronous inputs
    C.
    indirect inputs
    D.
    either direct inputs or synchronous inputs

  13. The advantages of high density IC are

  14. A.
    more circuits on chip
    B.
    high operating speed
    C.
    low power consumption
    D.
    both (a) and (b)

  15. The multiplication time for 10-bit numbers with 1 MHz clock will be

  16. A.
    32 μ sec
    B.
    20 μ sec
    C.
    21 μ sec
    D.
    22 μ sec

  17. The initial state of MOD-16 down counter is 011. After 37 clock pulses, the state of the counter will be

  18. A.
    1011
    B.
    0110
    C.
    0101
    D.
    0001

  19. In a 4 bit weighted resistor D/A converter, resistor value corresponding to LSB is 32 k ohm. The resistor value corresponding to MSB is

  20. A.
    32 k ohm
    B.
    16 k ohm
    C.
    8 k ohm
    D.
    4 k ohm