Low-Power Design Techniques MCQs

What is the primary goal of low-power design techniques in electronic circuits? A) To increase the complexity of designs B) To minimize power consumption while maintaining performance C) To reduce the size of components D) To improve signal integrity Answer: B) To minimize power consumption while maintaining performance Which of the following techniques is commonly used to reduce dynamic power consumption? A) Increasing supply voltage B) Reducing clock frequency C) Increasing the number of gates D) Using larger transistors Answer: B) Reducing clock frequency What is the purpose of voltage scaling in low-power design? A) To increase heat generation B) To lower the power supply voltage to reduce power dissipation C) To enhance performance D) To simplify circuit design Answer: B) To lower the power supply voltage to reduce power dissipation Which of the following techniques helps reduce static power dissipation? A) Power gating B) Increasing clock speed C) Adding more functional units D) Using higher supply voltage Answer: A) Power gating What does clock gating refer to in low-power design? A) Turning off the clock signal to unused circuit blocks B) Increasing clock frequency for better performance C) Generating multiple clock signals D) Synchronizing all clock signals Answer: A) Turning off the clock signal to unused circuit blocks Which low-power design technique involves turning off portions of the circuit when not in use? A) Voltage scaling B) Power gating C) Dynamic frequency scaling D) Load balancing Answer: B) Power gating What is dynamic frequency scaling? A) Adjusting the supply voltage based on workload B) Changing the operating frequency according to workload C) Maintaining a constant frequency D) Increasing the clock frequency for all operations Answer: B) Changing the operating frequency according to workload How does multi-threshold CMOS (MTCMOS) technology reduce power consumption? A) By using higher voltages B) By employing transistors with different threshold voltages for different blocks C) By increasing the number of transistors D) By decreasing circuit complexity Answer: B) By employing transistors with different threshold voltages for different blocks What is the impact of reducing supply voltage on a circuit’s power consumption? A) Power consumption decreases quadratically B) Power consumption remains constant C) Power consumption increases linearly D) Power consumption is unaffected Answer: A) Power consumption decreases quadratically Which technique is used to reduce power in digital circuits by minimizing the number of transitions? A) Voltage scaling B) Signal encoding C) Clock gating D) Power gating Answer: B) Signal encoding What is the main advantage of using sleep modes in low-power design? A) Increased processing speed B) Significant reduction in power consumption during idle periods C) Enhanced performance during active periods D) More complex circuit designs Answer: B) Significant reduction in power consumption during idle periods Which of the following describes a low-power design approach that adapts to varying workloads? A) Fixed-frequency operation B) Dynamic voltage and frequency scaling (DVFS) C) Constant voltage operation D) Power gating Answer: B) Dynamic voltage and frequency scaling (DVFS) How does using smaller transistors contribute to low-power design? A) It increases leakage current B) It reduces capacitance and thus dynamic power consumption C) It complicates design D) It has no impact on power consumption Answer: B) It reduces capacitance and thus dynamic power consumption What role does temperature play in low-power design? A) Higher temperatures always reduce power consumption B) Power dissipation typically increases with temperature C) Temperature has no impact on power D) Lower temperatures increase performance Answer: B) Power dissipation typically increases with temperature Which technique can improve energy efficiency in wireless communication devices? A) Increasing transmission power B) Using adaptive modulation and coding C) Reducing data rates D) Constant power transmission Answer: B) Using adaptive modulation and coding What is one disadvantage of implementing aggressive low-power techniques? A) Reduced performance B) Increased component size C) Higher costs D) Simpler designs Answer: A) Reduced performance What does the term “asynchronous design” refer to in low-power techniques? A) Designs that operate without a global clock B) Designs that require synchronization with external signals C) Designs that always run at maximum clock frequency D) Designs that only work in power-saving modes Answer: A) Designs that operate without a global clock Which of the following is a common approach to reduce power in embedded systems? A) Increasing system complexity B) Using dedicated hardware for specific tasks C) Running all components at full speed D) Ignoring workload variations Answer: B) Using dedicated hardware for specific tasks What is the effect of using low-power libraries in ASIC design? A) Increased area and complexity B) Decreased power consumption without affecting performance significantly C) No impact on power consumption D) Increased production costs Answer: B) Decreased power consumption without affecting performance significantly How does reducing the clock frequency impact dynamic power consumption? A) It has no effect B) It can significantly reduce dynamic power consumption C) It increases dynamic power consumption D) It only affects static power consumption Answer: B) It can significantly reduce dynamic power consumption What is the role of design for testability (DFT) in low-power design? A) It complicates circuit design B) It allows for easier identification of power-related issues C) It has no impact on power consumption D) It reduces manufacturing costs Answer: B) It allows for easier identification of power-related issues Which of the following strategies can help in managing power in data centers? A) Running all servers at peak capacity B) Implementing energy-efficient cooling systems C) Ignoring workload demands D) Using outdated hardware Answer: B) Implementing energy-efficient cooling systems What does the term “energy-aware design” refer to? A) Focusing solely on performance metrics B) Incorporating power consumption considerations into the design process C) Designing without regard to power D) Only considering hardware aspects Answer: B) Incorporating power consumption considerations into the design process Which of the following describes a hybrid approach to low-power design? A) Using only one type of low-power technique B) Combining multiple techniques for better efficiency C) Focusing solely on hardware optimizations D) Ignoring power considerations Answer: B) Combining multiple techniques for better efficiency What is the main benefit of using hardware acceleration in low-power designs? A) Increased complexity B) Enhanced power consumption C) Improved performance-per-watt D) Higher costs Answer: C) Improved performance-per-watt How can using non-volatile memory contribute to low-power design? A) It increases power consumption B) It reduces the need for frequent power cycling C) It complicates circuit design D) It has no impact on energy usage Answer: B) It reduces the need for frequent power cycling Which of the following design techniques aims to reduce power during signal transmission? A) Signal buffering B) Differential signaling C) Increasing line lengths D) Constant voltage signaling Answer: B) Differential signaling What is the purpose of implementing low-power modes in mobile devices? A) To enhance gaming performance B) To extend battery life C) To reduce the number of applications D) To increase display brightness Answer: B) To extend battery life Which technique is NOT typically used in low-power design? A) Voltage scaling B) Constant clock frequency C) Clock gating D) Power gating Answer: B) Constant clock frequency How does using an FPGA (Field-Programmable Gate Array) contribute to low-power design? A) It increases power consumption B) It allows for custom hardware configurations that can be optimized for power C) It requires constant reprogramming D) It is more expensive than ASICs Answer: B) It allows for custom hardware configurations that can be optimized for power What is the significance of low-power circuit design in IoT devices? A) It is not important B) It helps in extending battery life and reducing heat generation C) It increases the cost of devices D) It complicates design Answer: B) It helps in extending battery life and reducing heat generation

Low-Power Design Techniques MCQs
By: Prof. Dr. Fazal Rehman | Last updated: September 20, 2024

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