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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

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  3. How many flag are there in 8085 microprocessor?

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

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  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

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  7. Binary 101010 is equivalent to decimal number

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

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  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

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  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

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  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)

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  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

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  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

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  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

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