BARC 2018 ECE:Digital Electronics Nuclear Quiz 2

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Question 1

For the logic circuit shown below, the required input condition (A, B, C) to make the output (X) = 1 is

• A1, 0, 1
• B0, 0, 1
• C1, 1, 1
• D0, 1, 1

Question 2

The circuit shown in figure is a 4 – bit DAC
The input bits 0 and 1 are represented by 0 and 5 V respectively. The OP AMP is ideal, but all the resistances and the 5V inputs have a tolerance of ± 10%. The specification (rounded to the nearest multiple of 5%) for the tolerance of the DAC is

• A ± 35%
• B ± 20%
• C ± 10%
• D ± 5%

Question 3

A bulb in a staircase has two switches, one switch being at the ground floor and the other one at the first floor. The bulb can be turned ON and also can be turned OFF by any one of the switches irrespective of the state of the other switch. The logic of switching of the bulb resembles

• Aan AND gate
• Ban OR gate
• Can XOR gate
• Da NAND gate

Question 4

In the following circuit employing pass transistor logic, all NMOS transistors are identical with a threshold voltage of 1 V. Ignoring the body-effect, the output voltages at P, Q and R are,

• A4 V, 3 V, 2 V
• B5 V, 5 V, 5 V
• C4 V, 4 V, 4 V
• D5 V, 4 V, 3 V

Question 5

A 0 to 6 asynchronous counter consists of 3 flip-flops and a combination circuit of 2 input gate(s). The common circuit consists of

• Aone AND gate
• Bone OR gate
• Cone AND gate and one OR gate
• Dtwo AND gates

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