Top 550+ Solved Digital Principles and System Design MCQ Questions Answer
Q. Carry out BCD subtraction for (68) – (61) using 10’s complement method.
a. 00000111
b. 01110000
c. 100000111
d. 011111000
Q. When numbers, letters or words are represented by a special group of symbols, this process is called
a. decoding
b. encoding
c. digitizing
d. inverting
Q. A three digit decimal number requires for representation in the conventional BCD format.
a. 3 bits
b. 6 bits
c. 12 bits
d. 24 bits
Q. How many bits would be required to encode decimal numbers 0 to 9999 in straight binary codes?
a. 12
b. 14
c. 16
d. 18
Q. The excess-3 code for 597 is given by
a. 100011001010
b. 100010100111
c. 010110010111
d. 010110101101
Q. The decimal equivalent of the excess-3 number 110010100011.01110101 is
a. 970.42
b. 1253.75
c. 861.75
d. 1132.87
Q. In boolean algebra, the OR operation is performed by which properties?
a. associative properties
b. commutative properties
c. distributive properties
d. all of the mentioned
Q. The expression for Absorption law is given by
a. a + ab = a
b. a + ab = b
c. ab + aa’ = a
d. a + b = b + a
Q. DeMorgan’s theorem states that
a. (ab)’ = a’ + b’
b. (a + b)’ = a’ * b
c. a’ + b’ = a’b’
d. (ab)’ = a’ + b
Q. A user has designed JK flip flop by using the VHDL code. The output is continuously switching between 0 and 1. This condition is known as
a. switching condition
b. master slave condition
c. race around condition
d. edge triggered condition
Q. Which of the following method is not used to remove the race around condition in a flip flop?
a. using level triggered flip flop
b. using master slave flip flop
c. using edge triggered flip flop
d. all of the above are used to remove the race around
Q. Which of the following attribute is generally used in implementation of sequential circuits?
a. ‘stable
b. ‘length
c. ‘last_event
d. ‘event
Q. Which of the following line is correct for detecting positive edge of a clock?
a. if (clk’event and clk = ‘0’)
b. if (clk’event and clk = ‘1’)
c. if (clk’event or clk = ‘0’)
d. if (clk’event or clk = ‘1’)
Q. What are the typical values of tOE?
a. 10 to 20 ns for bipolar
b. 25 to 100 ns for nmos
c. 12 to 50 ns for cmos
d. all of the mentioned