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National Champion Test EC: Digital Circuits
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Question 1
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
Question 2
Consider the given circuit
In this circuit, the race around
In this circuit, the race around
Question 3
What is incorrect about Sample and Hold circuit?
Question 4
The voltage comparator shown in figure can be used in the analog-to-digital conversion as
Question 5
An input device is interfaced with Intel 8085A microprocessor as memory mapped I/O. The address of the device is 2500H. In order to input data from the device to accumulator, the sequence of instructions will be
Question 6
f(A, B, C, D) = π(0,1, 3, 4, 5, 7, 9, 11, 12, 13, 14, 15) is a maxterm representation of a Boolean function f(A, B, C, D) where A is the MSB and D is the LSB. The equivalent minimized representation of this function is
Question 7
Which of the following logic circuits is a realization of the function F whose Karnaugh map is shown in figure?
Question 8
A student made a 3-bit binary down counter and connected to the R-2R ladder type DAC (Gain = (-2 KΩ/2R) as shown the figure to generate a staircase waveform. The output achieved is different as shown in figure. What could be the possible cause of their error?
Question 9
For the circuit shown in the following figure, the Boolean expression for the output Y in terms of inputs P, Q, R and S is
Question 10
In an 8 bit microprocessor, which among the following is knows as high order register?
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Jul 2ESE & GATE EC
