Digital Systems Concepts Quiz - Set 4 (20 Questions)

1. What does 'IC' stand for in the context of digital electronics?

Internal Component Integrated Circuit Integrated Component Industrial Circuit

2. What is the key characteristic of an Integrated Circuit (IC)?

It is composed of discrete components assembled on a circuit board. It combines multiple electronic components onto a single semiconductor material. It uses only analog signals. It is primarily used for power amplification.

3. Which level of integration refers to an IC containing up to 100 logic gates?

SSI (Small-Scale Integration) MSI (Medium-Scale Integration) LSI (Large-Scale Integration) VLSI (Very Large-Scale Integration)

4. What distinguishes VLSI from LSI in terms of component count?

VLSI has less than 100 components, while LSI has more. VLSI contains thousands to hundreds of thousands of components, while LSI ranges from 100 to a few thousand. VLSI is exclusively for microprocessors, while LSI is for memory. LSI refers to discrete components, and VLSI refers to integrated circuits.

5. What is the primary factor used to classify digital ICs into 'logic families'?

Their physical size. The type of semiconductor device used in their construction. The number of pins on the IC package. Their maximum operating temperature.

6. Which logic family is known for its high speed and relatively low power consumption compared to TTL, making it suitable for portable devices?

RTL (Resistor-Transistor Logic) DTL (Diode-Transistor Logic) ECL (Emitter-Coupled Logic) CMOS (Complementary Metal-Oxide-Semiconductor)

7. What does the 'Fan-out' parameter of a logic gate indicate?

The number of inputs the gate can accept. The maximum number of similar gates that can be connected to its output without affecting its specified operation. The propagation delay of the gate. The amount of power consumed by the gate.

8. What is 'Propagation Delay' in the context of IC parameters?

The time it takes for an IC to warm up. The time required for an input signal to propagate through a gate and for the output to change accordingly. The delay in manufacturing the IC. The time between power-on and functional operation.

9. Which type of transistor is the primary building block of TTL (Transistor-Transistor Logic) devices?

MOSFETs JFETs Bipolar Junction Transistors (BJTs) CMOS transistors

10. What is a common characteristic of TTL outputs that can sometimes cause issues when interfacing with other logic families?

They always output high voltage. Their output current capabilities are very low. Their output logic levels (especially HIGH) are often close to the minimum acceptable input HIGH for other families. They are open-collector outputs by default.

11. What is the main advantage of CMOS logic over TTL logic in terms of power consumption?

CMOS consumes more power at higher frequencies. CMOS has significantly lower static power dissipation. TTL has lower dynamic power dissipation. They consume similar amounts of power.

12. Which type of transistor is the primary building block of CMOS (Complementary Metal-Oxide-Semiconductor) devices?

Bipolar Junction Transistors (BJTs) Field-Effect Transistors (FETs), specifically MOSFETs Diode transistors Resistor transistors

13. What is the purpose of 'IC Interfacing'?

To make all ICs operate at the same voltage level. To connect different types of Integrated Circuits (ICs) or logic families to work together correctly. To physically mount ICs onto a circuit board. To increase the speed of all connected ICs.

14. When interfacing TTL and CMOS, why might a pull-up resistor be needed on the output of a TTL gate driving a CMOS input?

To increase the current sinking capability of the TTL output. To ensure the TTL HIGH output voltage meets the minimum input HIGH requirement of the CMOS device. To protect the CMOS input from overvoltage. To decrease the propagation delay.

15. What is the typical supply voltage range for standard TTL ICs?

1.2V to 3.3V 5V (typically 4.75V to 5.25V) 9V to 15V 1.8V

16. What does 'Noise Margin' indicate for a digital IC?

The maximum speed at which the IC can operate without errors. The maximum allowable noise voltage that can be present on the input of a logic circuit without causing a false output. The amount of heat generated by the IC. The difference between input and output voltage levels.

17. Which logic family typically has a wider operating voltage range?

TTL CMOS ECL RTL

18. What is the typical Fan-out for a standard TTL gate?

1 5 10 20

19. What does SSI (Small-Scale Integration) typically include on a single chip?

Complete microprocessors. Basic logic gates like AND, OR, NOT, or a few flip-flops. Complex memory arrays. Entire computer systems.

20. Why is 'Power Dissipation' an important parameter for ICs?

It indicates the speed of the IC. It affects the heat generated by the IC, which can impact reliability and require cooling solutions. It determines the number of inputs an IC can have. It measures the physical size of the IC.