Digital Electronics

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1)   Which of the following use least power ?

  • [A] TTL
  • [B] ECL
  • [C] CMOS
  • [D] All uses same power

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CMOS

2)   The basic memory cell of dynamic RAM consists of

  • [A] a capacitance
  • [B] a transistor
  • [C] a flip flop
  • [D] a transistor acting as a capacitor

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a transistor acting as a capacitor

3)   The decimal equivalent of the hexadecimal number E5 is

  • [A] 279
  • [B] 229
  • [C] 427
  • [D] 3000

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229

4)   Matastability in D flip flop occurs when

  • [A] Set up time of input data is not met
  • [B] clock period is too large
  • [C] set and reset are active simultaneously
  • [D] D and Q pins are shortened

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Set up time of input data is not met

5)   The widely used code in data communication is

  • [A] 8 bit ASCII
  • [B] 7 bit ASCII
  • [C] EBCDIC
  • [D] None of the above

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7 bit ASCII

6)   Dual slope integration type analog to digital converters provide

  • [A] higher speeds compared to all other types of A/D converters
  • [B] very good accuracy without putting extreme requirements on component stability
  • [C] poor rejection of power supply
  • [D] better resolution compared to all other types of A/D converters for the same number of bits

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very good accuracy without putting extreme requirements on component stability

7)   The resolution of a 4 bit counting ADC is 0.5 volts . For an analog input of 6.6 volts, the digital outptu of the ADC will be

  • [A] 1001
  • [B] 1101
  • [C] 1100
  • [D] 1110

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1110

8)   Commercially available ECL gears use two ground lines ad one negative supply in order to

  • [A] Reduce power dissipation
  • [B] Increase fan out
  • [C] Reduce loading effect
  • [D] Eliminate the effect of power line glitches or the basic circuit

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Eliminate the effect of power line glitches or the basic circuit

9)   A computer system has a 4K word cache organised in blockset associative manner with 4 blocks per set, 64 words per block. The number of bits in the SET and WORDS field of the main memory address formula is

  • [A] 15,4
  • [B] 6,4
  • [C] 7,2
  • [D] 4,6

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4,6

10)   A binary tree T has n leaf nodes. The number of nodes degree 2 in T is

  • [A] logn
  • [B] n-1
  • [C] n
  • [D] 2n

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n-1

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