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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

151.	Human body interaction causes distortions in antenna pattern and health risk in human beings.(a) True(b) FalseThe question was posed to me in homework.My question comes from Antenna Tradeoffs topic in chapter Technology Tradeoffs in Software Defined Radio of Cognitive Radio
Answer» The correct option is (a) True To elaborate: Human body interaction causes DISTORTIONS in ANTENNA pattern and HEALTH risk in human beings. Handheld device generally tilt the wire antenna away from the USER for minimal ABSORPTION and better radiation efficiency.

152.	What is the operating range of a pyramidal horn antenna?(a) 1 – 6 GHz(b) 1 – 5 GHz(c) 300 MHz – 70 GHz(d) 100 MHz – 35 GHzI have been asked this question in unit test.I'd like to ask this question from Antenna Tradeoffs in portion Technology Tradeoffs in Software Defined Radio of Cognitive Radio
Answer» Right choice is (C) 300 MHz – 70 GHz For explanation I would say: The pyramidal HORN antenna is an aperture type antenna operating in the range 300MHZ – 70GHz. It is used in radar communication.

153.	_____ characterizes data flow path.(a) Data path model(b) Queuing model(c) Operational model(d) Critical resource modelI had been asked this question during an internship interview.The above asked question is from Performance Management Tradeoffs topic in section Technology Tradeoffs in Software Defined Radio of Cognitive Radio
Answer» CORRECT CHOICE is (d) Critical resource model For explanation I would say: The first step in performance management PROCESS is the identification of critical resources. Critical resource model characterizes data flow path, control flow path and each of the significant processing source.

154.	____ is responsible for availability of resources on the logical path over which the channel is defined.(a) Finite state machine(b) Push-down automata(c) Agent state machine(d) Channel control state machineI got this question at a job interview.I would like to ask this question from Software Architecture Tradeoffs in division Technology Tradeoffs in Software Defined Radio of Cognitive Radio
Answer» Correct choice is (d) Channel CONTROL STATE MACHINE To elaborate: At the top level, each channel object, mode or personality has a top-level channel-setup state machine. Channel control state machine is responsible for availability of RESOURCES on the logical path over which the channel is defined. It is generally referred to as INFRASTRUCTURE state machine.

155.	Which of the following addressing modes contain operand in the instruction?(a) Direct(b) Indirect(c) Register(d) ImmediateThe question was posed to me in an interview for internship.My doubt stems from Digital Architecture Tradeoffs topic in portion Technology Tradeoffs in Software Defined Radio of Cognitive Radio
Answer» The correct option is (d) Immediate Easiest EXPLANATION: Instruction set extension includes DIRECT, indirect, register, and immediate ADDRESSING modes. Immediate addressing mode contains the operand in the instruction. The other addressing modes contain some form of address as a PART of instruction.

156.	____ enables context switching.(a) Push/Pop of register stack(b) ALU(c) Bus(d) MemoryThis question was posed to me in a national level competition.The question is from Digital Architecture Tradeoffs topic in portion Technology Tradeoffs in Software Defined Radio of Cognitive Radio
Answer» The correct option is (a) Push/Pop of register stack The explanation: An EXAMPLE of INSTRUCTION set extension is RAPID CONTEXT switching. It is implemented using push/pop of register stack hardware. Hardware semaphore can be USED for error-free sharing of resources.

157.	MFLOPS stands for Millions of Fixed Point Operation per Second.(a) True(b) FalseThe question was asked during a job interview.Question is from Digital Architecture Tradeoffs topic in chapter Technology Tradeoffs in Software Defined Radio of Cognitive Radio
Answer» Correct option is (b) False Best explanation: MFLOPSstands for Millions of Floating Point Operation per SECOND. An operation (OP) is a logical transformation of data carried out by portion of hardware in ONE clock cycle. MIPS, MOPS, MFLOPS are differentiated by their logical scope.

158.	Which of the following applications takes only SFDR as its performance metric?(a) Spread spectrum access(b) Wideband digital receiver(c) Cellular Phone(d) Spectrum analysisThis question was posed to me by my school principal while I was bunking the class.My doubt stems from ADC Tradeoffs topic in division Technology Tradeoffs in Software Defined Radio of Cognitive Radio
Answer» Right ANSWER is (b) Wideband digital RECEIVER The explanation is: Spurious FREE Dynamic Range is used in wideband digital receiver to quantify the reliability of detection of WEAK signals in the presence of strong in-band INTERFERENCE.

159.	In non-monotonic filters, attenuation increases with frequency.(a) True(b) FalseThe question was posed to me during a job interview.My doubt stems from ADC Tradeoffs topic in division Technology Tradeoffs in Software Defined Radio of Cognitive Radio
Answer» The correct answer is (b) False For explanation I WOULD say: In MONOTONIC filters, attenuation INCREASES with frequency. Non-monotonic filter has less attenuation. It allows energy BEYOND the PASSBAND and exhibits phase distortion.

160.	RF MEMS gives _______ alternative to electronic switching circuits.(a) an electromechanical(b) a mechanical(c) an electro-dynamic(d) an interconnectedThe question was posed to me in an online interview.My enquiry is from RF and IF Processing Tradeoffs topic in portion Technology Tradeoffs in Software Defined Radio of Cognitive Radio
Answer» The correct option is (a) an electromechanical The EXPLANATION is: RF MEMS gives an electromechanical ALTERNATIVE to electronic switching circuit. RF MEMS can aid in the reduction of SIZE, WEIGHT and POWER.

161.	Which of the following is used in base station applications?(a) Super heterodyne receiver(b) Direct conversion receiver(c) Digital-RF receiver(d) Homodyne receiverThe question was posed to me in an internship interview.This key question is from RF and IF Processing Tradeoffs in section Technology Tradeoffs in Software Defined Radio of Cognitive Radio
Answer» The CORRECT choice is (a) Super heterodyne RECEIVER To explain: Super heterodyne receiver is used in base STATION applications. Direct conversion receiver is used in handsets. Digital-RF receiver PERFORMS DEMODULATION at RF.

162.	The parameters of the antenna considered for RF access are ______(a) RF band and bandwidth(b) RF band and resonant frequency(c) noise constraints and bandwidth(d) directivity and RF bandI got this question in a job interview.Asked question is from Antenna Tradeoffs topic in chapter Technology Tradeoffs in Software Defined Radio of Cognitive Radio
Answer» Correct choice is (a) RF BAND and bandwidth Explanation: The parameters of the antenna CONSIDERED for RF access are RF band and bandwidth. Antenna architecture determines the number and bandwidth of RF channels. This IMPOSES CONSTRAINT on number and bandwidth of ADCs.

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