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ECE :: Digital Electronics

Digital Electronics - Section 1
Digital Electronics - Section 2
Digital Electronics - Section 3
Digital Electronics - Section 4
Digital Electronics - Section 5
Digital Electronics - Section 6
Digital Electronics - Section 7
Digital Electronics - Section 8
Digital Electronics - Section 9
Digital Electronics - Section 10
Digital Electronics - Section 11
Digital Electronics - Section 12
Digital Electronics - Section 13
Digital Electronics - Section 14
Digital Electronics - Section 15
Digital Electronics - Section 16
Digital Electronics - Section 17
Digital Electronics - Section 18
Digital Electronics - Section 19
Digital Electronics - Section 20
Digital Electronics - Section 21
Digital Electronics - Section 22
Digital Electronics - Section 23
Digital Electronics - Section 24
Digital Electronics - section-25
Digital Electronics - Section-26

  1. Which multivibrator can be used as a clock timer?

    2. A.
    Astable multivibrator
    B.
    Bistable multivibrator
    C.
    Any of the above
    D.
    None of the above

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  2. T-flip-flop is commonly used as

    3. A.
    a delay switch
    B.
    a digital counter only
    C.
    a digital counter and frequency divider
    D.
    any of the above

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  3. In the NMOS inverter

    4. A.
    the driver and achieve load are enhancement type
    B.
    the driver is enhancement type and load depletion type
    C.
    both driver and load are depletion type
    D.
    the driver and load are depletion type

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  4. For the switch circuit, taking open as 0 and closed as 1, the expression for the circuit is Y. Y is given by

    5. A.
    A + (B + C) D
    B.
    A + BC + D
    C.
    A(BC + D)
    D.
    none of these

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  5. Assuming accumulator contain A 64 and the carry is set (1).What will register A and (CY) contain after RAR?

    6. A.
    4 DH, 0
    B.
    D 3H, 0
    C.
    4 DH, 1
    D.
    53 H, 0

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  6. Equipment using BCD numbers

    7. A.
    pocket calculators
    B.
    electronic counter
    C.
    digital voltmeters
    D.
    all of the above

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  7. If number of bits is N, the % resolution in analog to digital conversion is

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  8. In a microprocessor system the stack is used for

    9. A.
    starting the program return address whenever a subroutine jump instruction is execute
    B.
    transmitting and receiving input and output data
    C.
    starting all important CPU register contents whenever an interrupt is to be serviced
    D.
    storing program instructions for interrupt service routine

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  9. In N channel MOSFET with gate reverse biased, the gate current is of the order

    10. A.
    10-3 amp
    B.
    10-6 amp
    C.
    10-9 amp
    D.
    10-12 amp

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  10. In 8085 microprocessor, a RIM instruction is used to

    11. A.
    disable the interrupts 7.5, 6.5, 5.5
    B.
    enable the interrupts 7.5, 6.5, 5.5
    C.
    read in the serial input data
    D.
    none of the above

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