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Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE) PDF Download

Q1: The logical gate implemented using the circuit shown below where, V1 and V2 are inputs (with 0 V as digital 0 and 5 V as digital 1) and  VOUT is the output is (SET-1(2017))Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)(a) NOT
(b) NOR
(c) NAND
(d) XOR
Ans: 
(b)
Sol: Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)When V1 = high 5 V,  Q1 on, Vout = 0
 V= high 5 V, Q2 on, Vout = 0
Thus when any V1 or V2 is high then, Vout = 0
Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)
Thus, it is a NOR gate.

Q2: In the circuit shown below,  Q1 has negligible collector-to-emitter saturation voltage and the diode drops negligible voltage across it under forward bias. If Vcc is +5 V, X and Y are digital signals with 0 V as logic 0 and Vcc as logic 1, then the Boolean expression for Z is  (2013)
Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)(a) XY
(b) Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)

(c) Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)
(d) Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)
Ans: (b)
Sol: Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)

Q3: The TTL circuit shown in the figure is fed with the waveform X (also shown). All gates have equal propagation delay of 10 ns. The output Y of the circuit is (2010)
Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)(a) Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)(b) Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)(c) Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)(d) Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)Ans:
(a)
Sol: Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)
Q4: A TTL NOT gate circuit is shown in figure. Assuming VBE = 0.7 V of both the transistors, if  V= 3.0 V, then the states of the two transistors will be (2006)
Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)(a) Q1 ON and Q2 OFF
(b) Q1 reverse ON and Q2 OFF
(c) Q1Q1 reverse ON and Q2 ON
(d) QOFF and Q2 reverse ON
Ans:
(c)
Sol: When V= 3V then Q1 will be in reverse active mode i.e. reverse ON and Qwill be ON.

Q5: If X1 and X2 are the inputs to the circuit shown in the figure, the output Q is (2005)
Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)(a) Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)

(b) Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)
(c) Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)
(d) Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)
Ans: (d)
Sol: Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)Output, Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)Previous Year Questions- Logic Families and Miscellaneous | Analog and Digital Electronics - Electrical Engineering (EE)

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FAQs on Previous Year Questions- Logic Families and Miscellaneous - Analog and Digital Electronics - Electrical Engineering (EE)

1. What are the main types of logic families used in digital circuits?
Ans. The main types of logic families include Bipolar Junction Transistor (BJT) families such as TTL (Transistor-Transistor Logic) and CMOS (Complementary Metal-Oxide-Semiconductor) families. TTL is known for its speed and robustness, while CMOS is favored for its low power consumption and high noise immunity.
2. How do TTL and CMOS logic families differ in terms of power consumption?
Ans. TTL logic families consume more power compared to CMOS families. TTL devices draw a constant amount of current regardless of the input state, while CMOS devices consume power only during the switching of states, making them significantly more power-efficient, especially in battery-operated devices.
3. What are the advantages of using CMOS logic family over TTL?
Ans. The advantages of using CMOS over TTL include lower power consumption, higher noise margins, greater density of logic functions on a chip, and the ability to operate at higher voltages. Additionally, CMOS technology allows for a wider range of supply voltages and improved heat dissipation.
4. What is the significance of propagation delay in logic families?
Ans. Propagation delay is the time it takes for an input change to result in an output change in a logic gate. It is a critical parameter as it affects the overall speed of digital circuits. Lower propagation delays enable faster operation of digital systems, which is essential for high-speed applications.
5. What are some common applications of different logic families in electrical engineering?
Ans. Different logic families find applications in various fields: TTL is commonly used in simpler, cost-effective digital circuits, while CMOS is widely used in microprocessors, memory chips, and portable devices due to its low power consumption. ECL (Emitter-Coupled Logic) is preferred in high-speed applications like data communication systems.
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