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Digital Electronics

Digital Electronics
The 2s complement of 17 is

 111110.
  101111.
 101110.
 110001.

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Digital Electronics
Dual slope ADC has R = 1 KΩ and C = 0.22 nanofarad has charging and discharge times for some voltage is 9 ns and 3 ns respectively. The reference Voltage is 2.2 V. What is the peak voltage reached by triangular wave during charging?

 30 mV.
 900 mV.
 90 mV.
 300 mV.

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Digital Electronics
Which of the following memories uses one transistor and one capacitor as basic memory unit

 DRAM
 Both SRAM and DRAM
 None
 SRAM

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Digital Electronics
Which of the following logic circuits is the fastest ?

 All have same speed.
 DTL.
 TTL.
 RTL.

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Digital Electronics
The effect of stray magnetic field on the actuating torque of a portable instrument is maximum when the operating field of the instrument and the stray fields are

 Inclined at 60°.
 Inclined at 30°.
 Perpendicular.
  Parallel.

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Digital Electronics
The output of a logic gate is 1 when all its inputs are at logic 0. The gate is either

 an AND or an X-NOR
 a NAND or a NOR
 an OR or a NAND
 an X-OR or an X-NOR

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