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BARC ECE 2019 : Digital Electronics Nuclear Quiz 3
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Question 1
The 9’s compliment for the decimal number 7543 is
Question 2
A digital computer has a memory unit with 20 bits per word. The instruction set consists of 120 different operations. Each instruction is stored in 1 word of memory and consists of operation part and address part. The number of words can be accommodated by the memory unit are
Question 3
Following is the K-map of a Boolean function of five variables P, Q, R, S and X. The minimum sum-of-product (SOP) expression for the function is
Question 4
Consider a program written in assembly language
MVI B, 05 H
L1: MVI C, 0F H
L2: DCR C
JNZ L2
DCR B
JNZ L1
HLT
The total number of memory accesses required if the program is executed in 8085 is
MVI B, 05 H
L1: MVI C, 0F H
L2: DCR C
JNZ L2
DCR B
JNZ L1
HLT
The total number of memory accesses required if the program is executed in 8085 is
Question 5
The minimum number of 2-input NAND gates required to implement a 2-input XOR gate is
Question 6
Find fan-out for a gate IOL(Max) = 18mA; IIL(Max) = 0.0018A.
Question 7
A 4 digit BCD D/A converter is a weighted resister type with in per VR = 1, R= 1M Ω and Rf = 20 KΩ Resolution in per cent will be
Question 8
what is the expression for difference, borrow of full subtractor circuit
Question 9
A one bit full adder takes 75 nsec to produce sum and 50 nsec to produce carry. A 4 bit parallel adder is designed using this type of full adder. The maximum rate of additions per second can be provided by 4 bit parallel adder is Ax106 additions/sec. The value of A is _____ .
Question 10
what is the output of the flip flop shown in the figure if the clock frequency is 4 KHz
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