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ECE :: Digital Electronics

  1. The output of basic DTL configuration is

  2. A.
    low when one of the input is high
    B.
    low when all inputs are high
    C.
    high when all inputs are high
    D.
    high when all inputs are low

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  3. figure shows three pulse train inputs to a 3-input AND gate. Assuming positive logic, the output signal obtained in figure would be

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  5. The number of flip flops required to construct a register to store number 10210 in binary form is

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

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  7. Minimum no. of 2 I/P NAND gate required to implement the Boolean function Z = ABC, assuming that A, B and C are available is

  8. A.
    2
    B.
    3
    C.
    5
    D.
    6

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  9. In 8085 microprocessor, which of the following interrupts is unmaskable interrupts?

  10. A.
    RST 5.5
    B.
    RST 7.5
    C.
    TRAP
    D.
    INTR

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  11. The 8085 microprocessor is interrupted while executing MOV instruction at location 0210 H. What is the location at which contents of register E are stored.

  12. A.
    054 CH
    B.
    054 DH
    C.
    054 EH
    D.
    054 FH

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  13. The amplifier used in bootstrap voltage sweep should have a gain of

  14. A.
    +1
    B.
    +∞
    C.
    -1
    D.
    -∞

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  15. +12 V supply is given to plates a, d, g, and 0 V to other plates and grid of a VF display. The plates which will glow are

  16. A.
    a, d, g
    B.
    b, c, e, f
    C.
    all
    D.
    none

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  17. An interrupt in which the external device supplies its address as well as the interrupt is known as

  18. A.
    vectored interrupt
    B.
    maskable interrupt
    C.
    polled interrupt
    D.
    non-maskable interrupt

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  19. What is the decimal equivalent of the binary number shown in fourth row?

  20. A.
    79
    B.
    97
    C.
    117
    D.
    127

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