What is the primary advantage of CMOS logic over TTL logic in modern designs?
Answer: B
CMOS logic offers significantly lower power consumption (only during switching) and better noise margins compared to TTL, making it ideal for modern low-power applications.
Q.182Easy
In a multiplexer with 8 input lines, how many output lines are present?
Answer: A
A multiplexer, regardless of the number of inputs, has only one output line. The select lines determine which input is routed to that output.
Q.183Easy
De Morgan's theorem states that (A·B)' equals:
Answer: A
De Morgan's first theorem states (A·B)' = A' + B'. The complement of AND equals OR of complements.
Q.184Easy
A 4-bit binary counter requires how many flip-flops to count from 0 to 15?
Answer: B
A 4-bit counter can represent 2^4 = 16 states (0 to 15), requiring exactly 4 flip-flops.
Q.185Easy
Which logic gate produces a HIGH output only when all inputs are HIGH?
Answer: B
AND gate outputs HIGH only when all inputs are HIGH. This is its fundamental definition.
Advertisement
Q.186Easy
What is the minimum number of NAND gates required to implement a NOT gate?
Answer: A
A single NAND gate with both inputs tied together acts as a NOT gate (inverter).
Q.187Easy
In a J-K flip-flop, when J=1 and K=1, the output will:
Answer: B
When J=1 and K=1, the J-K flip-flop toggles its state on each clock pulse.
Q.188Easy
A 3-to-8 decoder has how many output lines?
Answer: C
A 3-to-8 decoder has 3 input lines and 2^3 = 8 output lines, one for each possible input combination.
Q.189Easy
Which of the following is the correct relationship for setup time in sequential circuits?
Answer: B
Setup time is the minimum duration that input data must remain stable before the active clock edge for proper capture by the flip-flop.
Q.190Easy
A Karnaugh map with 5 variables requires a minimum of how many cells?
Answer: B
A 5-variable K-map requires 2^5 = 32 cells, typically arranged as two 4x4 grids representing the fifth variable's 0 and 1 states.
Q.191Easy
In a multiplexer circuit, if there are 16 output lines, how many select lines are required?
Answer: B
For n select lines, 2^n output lines are possible. Here 2^4 = 16, so 4 select lines are needed. This is a standard 16:1 multiplexer.
Q.192Easy
In a BCD (Binary Coded Decimal) counter, what is the maximum count value?
Answer: A
BCD represents decimal digits 0-9 using 4 bits. A single BCD counter counts from 0 to 9, after which it resets.
Q.193Easy
Which semiconductor technology provides the lowest static power consumption?
Answer: B
CMOS has virtually zero static power consumption because complementary transistors prevent direct paths from supply to ground in steady state.
Q.194Easy
A combinational circuit has 6 input variables. The minimum number of rows required in its truth table is:
Answer: B
For n input variables, truth table rows = 2^n. For 6 inputs: 2^6 = 64 rows.
Q.195Easy
A 3-to-8 decoder is used in a digital system. How many AND gates with minimum inputs are required?
Answer: B
A 3-to-8 decoder requires 8 output lines. Each output is active for one unique combination of 3 inputs, requiring 8 AND gates, each with 3 inputs (one for each input variable or its complement).
