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ECE :: Digital Electronics

  1. In an op-amp a virtual ground is a ground for

  2. A.
    voltage only
    B.
    current only
    C.
    both voltage and current
    D.
    neither voltage nor current

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  3. Assuming accumulator contain A 64 and the carry is set (1). What will register A and (CY) contain after SBI 0B7H?

  4. A.
    12 H, 0
    B.
    12 H, 1
    C.
    DDH, 0
    D.
    DDH, 1

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  5. The Central Processing Unit (CPU) of the 16-processor system developed by hardware and software teams of C-DOT, Bangalore is configured around

  6. A.
    Motorola 68020
    B.
    Motorola 68040
    C.
    Intel 80386
    D.
    Intel 80486

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  7. Figure shows an 8-bit LED display. A light circle means that a LED is ON (binary 1) and a dark circle means a LED is OFF (binary 0). What is the decimal equivalent of the binary number displayed?

  8. A.
    100
    B.
    121
    C.
    144
    D.
    172

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  9. For NOR gate SR flip-flop, the 'no change' condition is

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

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  11. Which type of gate is in the given figure?

  12. A.
    NOR
    B.
    OR
    C.
    NAND
    D.
    EX-OR

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  13. Which of the following will be hexadecimal number just for prior to F52B?

  14. A.
    E 51 A
    B.
    F 51 B
    C.
    E 52 B
    D.
    F 52 A

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  15. A pair of 21114s can store __________ words of __________ bits each.

  16. A.
    2114, 8
    B.
    1024, 8
    C.
    4228, 16
    D.
    2114, 16

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  17. In hexadecimal number system, A is equal to decimal number

  18. A.
    10
    B.
    11
    C.
    17
    D.
    18

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  19. Which binary addition is incorrect?

  20. A.
    1001.1 + 1011.01 = 10100.11
    B.
    100010 + 1000101 = 1001010
    C.
    0.0011 + 0.1110 = 1.1
    D.
    1011.01 + 1001.11 = 10111

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