Explore topic-wise InterviewSolutions in .

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.

1.

What is the purpose of memory refresh register of Z80?(a) To control on-chip DRAM(b) To control on-chip SRAM(c) To control ROM(d) Toclear cacheThe question was asked in an interview for job.My question is based upon Microprocessor of Embedded System topic in division Embedded System of Embedded Systems

Answer»

Right OPTION is (a) To control on-chip DRAM

For explanation I would SAY: In addition to the general purpose registers, a stack pointer, program counter, and two index registers are included in Z80. It was also used in MANY embedded designs because of its high-quality performance and for its in-built refresh circuitry for DRAMs.

2.

In the below diagram, identify the register of MC68HC05(a) CCR(b) PC(c) SP(d) IVThe question was posed to me in an interview for internship.My question is taken from Microcontroller of Embedded System topic in division Embedded System of Embedded Systems

Answer»

Right choice is (a) CCR

To explain: MC68HC05 have different registers such as the accumulator, STACK pointer, INDEX register . Condition CODE register has to carry flag, zero flags, negative flag, interrupt flag, Half carry flag.

3.

What is done in mode1 of Z80?(a) Interrupt vector is supplied via the external bus(b) Interrupt vector is supplied via the peripherals(c) NMI gets started(d) Interrupt gets acknowledge from peripheralI had been asked this question during an online exam.I would like to ask this question from Microprocessor of Embedded System in division Embedded System of Embedded Systems

Answer»

The correct answer is (a) INTERRUPT vector is SUPPLIED via the external bus

The explanation: In mode 1, the interrupt vector is supplied via the external data bus. The MEMORY REFRESH register is USED to control the on-chip DRAM refresh circuitry.

4.

How an alternate set of the register can be identified in Z80?(a) ‘Suffix(b) ‘Prefix(c) ,suffix(d) ,prefixThe question was asked in exam.This key question is from Microprocessor of Embedded System in division Embedded System of Embedded Systems

Answer» RIGHT OPTION is (a) ‘Suffix

The explanation: In order to IDENTIFY the MAIN REGISTER and alternate register ‘ is used in the suffix.
5.

What is the clock frequency of Z80?(a) 6 MHz(b) 8 MHz(c) 4 MHz(d) 2 MHzThis question was posed to me in unit test.The above asked question is from Microprocessor of Embedded System in chapter Embedded System of Embedded Systems

Answer» RIGHT option is (c) 4 MHz

The BEST I can explain: It is the maximum CLOCK frequency or runs a time of the PROCESSOR.
6.

The initial routine is often referred to as(a) Initial program(b) Bootstrap program(c) Final program(d) Initial embedded programThis question was posed to me by my school teacher while I was bunking the class.Enquiry is from Memory and Peripherals of Embedded System in division Embedded System of Embedded Systems

Answer»

The correct answer is (b) Bootstrap program

To explain I would say: ROM CONTAINS the program which is capable of OBTAINING the full software from another source WITHIN or outside of the SYSTEM. This initialisation routine is also REFERRED to as bootstrap program or routine.

7.

Which one of the following is a microcontroller from Motorola?(a) MC68HC05(b) 4004(c) MIPS(d) 8080The question was posed to me in my homework.My question comes from Microcontroller of Embedded System topic in chapter Embedded System of Embedded Systems

Answer»

The CORRECT OPTION is (a) MC68HC05

Easiest explanation: MC68HC05 is DESIGNED by MOTOROLA but 4004 and 8080 are designed by Intel.MIPS is designed by MIPS technology.

8.

How an embedded system communicate with the outside world?(a) Peripherals(b) Memory(c) Input(d) OutputI have been asked this question in semester exam.I would like to ask this question from Memory and Peripherals of Embedded System topic in portion Embedded System of Embedded Systems

Answer»

The CORRECT choice is (a) Peripherals

For EXPLANATION I WOULD say: The system communicates with the outside world through peripherals.

9.

What is CISC?(a) Computing instruction set complex(b) Complex instruction set computing(c) Complimentary instruction set computing(d) Complex instruction set complementaryThe question was posed to me in an interview.My question comes from Processor of Embedded System in section Embedded System of Embedded Systems

Answer»

The CORRECT choice is (b) Complex INSTRUCTION SET computing

Easiest explanation: It is COMPLEMENTARY to RISC architecture and has complex instruction set compared to RISC architecture.

10.

How many bytes of EPROM does MC68HC7054A possess?(a) 176 bytes(b) 240 bytes(c) 4144 bytes(d) 1024 bytesThe question was asked during an internship interview.The question is from Microcontroller of Embedded System topic in section Embedded System of Embedded Systems

Answer»

The correct CHOICE is (C) 4144 bytes

Best explanation: There are DEFINED MEMORY SIZE for different processors and controllers. The MC68HC705A has 4144 bytes of EPROM.

11.

Which one of the following is an asynchronous communication channel?(a) SPI(b) MUDs(c) MOO(d) VOIPThe question was asked in an interview for job.My question is taken from Microcontroller of Embedded System topic in section Embedded System of Embedded Systems

Answer»

The correct answer is (a) SPI

Explanation: MOO, MUDs, and VOIP are APPS for the ONLINE conference which is synchronous but SPI is an asynchronous COMMUNICATION channel.

12.

Z80 is mainly based on(a) Intel 8080(b) MIPS(c) TIMS(d) 8051I had been asked this question in an interview for internship.My doubt stems from Microprocessor of Embedded System in section Embedded System of Embedded Systems

Answer»

Correct ANSWER is (a) Intel 8080

Easiest explanation: Its ARCHITECTURE is based on Intel 8080 but has an extended instruction set and hardware IMPROVEMENT.

13.

What kind of memory does an OTP have?(a) SRAM(b) RAM(c) EPROM(d) DRAMThis question was posed to me by my school teacher while I was bunking the class.This interesting question is from Memory and Peripherals of Embedded System topic in section Embedded System of Embedded Systems

Answer»

The correct ANSWER is (c) EPROM

To EXPLAIN: OTP is one-time programming so it should POSSESS a nonvolatile memory andEPROM is a nonvolatile memory whereas SRAM, DRAM and RAM are volatile memories.

14.

Which of the following is a 4-bit architecture?(a) MC6800(b) 8086(c) 80386(d) National COP seriesThis question was posed to me in my homework.I would like to ask this question from Processor of Embedded System topic in portion Embedded System of Embedded Systems

Answer» RIGHT option is (d) NATIONAL COP series

Easy explanation: National COP series is a 4-bit PROCESSOR whereas MC6800 is an 8-bit processor, 8086 is a 16-bit processor and 80386 is a 32-bit processor.
15.

How many bits does MC68HC05 possess?(a) 4(b) 8(c) 16(d) 32I got this question by my college director while I was bunking the class.My question is from Microcontroller of Embedded System in section Embedded System of Embedded Systems

Answer»

Right ANSWER is (b) 8

Explanation: MC68HC05 is a 8 BIT controller.

16.

What type of memory is suitable for medium volume production?(a) Umbrella devices(b) OTP(c) ROM(d) RAMI have been asked this question during an online exam.My question is based upon Memory and Peripherals of Embedded System topic in section Embedded System of Embedded Systems

Answer»

The correct option is (B) OTP

Explanation: One-time PROGRAMMABLE MEMORY is ALSO a nonvolatile memory so it is used for medium volume production.

17.

VME bus stands for(a) Versa module Europa bus(b) Versa module embedded bus(c) Vertical module embedded bus(d) Vertical module Europa busI had been asked this question in my homework.My doubt stems from Processor of Embedded System in chapter Embedded System of Embedded Systems

Answer» RIGHT answer is (a) Versa MODULE EUROPA bus

Explanation: A computer bus standard in Eurocard sizes mainly developed for Motorola MC6800 FAMILY and LATER on used in many applications and approved by IEEE.
18.

Which one of the following is UV erasable?(a) Flash memory(b) SRAM(c) EPROM(d) DRAMThis question was posed to me in an interview for job.I would like to ask this question from Memory and Peripherals of Embedded System in chapter Embedded System of Embedded Systems

Answer»

The correct option is (c) EPROM

For EXPLANATION: EPROM is an erasable program and it can be ERASED by ultraviolet RADIATIONS. SRAMand DRAM are volatile MEMORIES. Flash MEMORY to is a volatile memory but it is not UV erasable.

19.

Which of the following microcontroller is used in engine management system?(a) MC68HC05(b) MC68HC11(c) Intel 80286(d) Intel 8086This question was addressed to me by my school principal while I was bunking the class.The origin of the question is Microcontroller of Embedded System topic in portion Embedded System of Embedded Systems

Answer»

Correct choice is (b) MC68HC11

The explanation: MC68HC11 was originally designed in conjunction with General MOTORS for usewithin engine management systems. As a RESULT, its initial versions had built-in EEPROM/OTP ROM, RAM, digital I/O, timers,8 channel 8 bit A/D converter, PWM generator, and synchronous and asynchronous COMMUNICATIONS channels (RS232 and SPI).

20.

Which type of memory is suitable for low volume production of embedded systems?(a) ROM(b) Volatile(c) Non-volatile(d) RAMI got this question in a national level competition.My question comes from Memory and Peripherals of Embedded System in section Embedded System of Embedded Systems

Answer»

The correct answer is (c) Non-volatile

To EXPLAIN: The devices which use non-volatile memory ALLOW the software to download and returned in the device. UV erasable EPROM is FAVORABLE but EEPROM is also gaining favor. THEREFORE,this type of memory is used in low volume production.

21.

Name a nonvolatile memory.(a) ROM(b) RAM(c) SRAM(d) DRAMThis question was posed to me during a job interview.Query is from Memory and Peripherals of Embedded System in section Embedded System of Embedded Systems

Answer»

Right option is (a) ROM

The best explanation: Non-volatile memory is the ONE which retains its content even when the POWER is REMOVED. This is done by an on-chip read only memory (ROM) or an external EPROM. The software that it contains the program which is capable of obtaining the full software from another source within or outside of the system. This INITIALISATION routine is also referred to as a bootstrap program or routine.

22.

Which of the following offers external chips for memory and peripheral interface circuits?(a) Microcontroller(b) Microprocessor(c) Peripheral system(d) Embedded systemThe question was posed to me in unit test.Origin of the question is Processor of Embedded System topic in division Embedded System of Embedded Systems

Answer» CORRECT answer is (B) MICROPROCESSOR

The best explanation: Microcontrollers are the CPUS which have integrated memory and peripherals whereas microprocessor offers EXTERNAL chips for memory.
23.

Which of the following can be a paired set of 16-bit register?(a) CD(b) HL(c) AB(d) EHI got this question in final exam.This is a very interesting question from Microprocessor of Embedded System in division Embedded System of Embedded Systems

Answer»

Right ANSWER is (b) HL

The best explanation: REGISTERS B, C, D, E, H and L are 8-bit general-purpose registers that can be concatenated to produce 16 registers known as BC, DE, and HL.

24.

Which are the two additional registers of Z80?(a) Interrupt and NMI(b) NMI and PSW(c) Interrupt vector and memory refresh(d) NMI and memory refreshThis question was addressed to me during an interview.Asked question is from Microprocessor of Embedded System topic in chapter Embedded System of Embedded Systems

Answer»

Correct OPTION is (c) Interrupt vector and memory refresh

The best I can explain: The Interrupt vector(IV) register is used in the interrupt handling. Mode 2 is used to point the REQUIRED software ROUTINE to process the interrupt. In mode 1, the interrupt vector is supplied via the external data bus.

25.

Which of the following is a RISC architecture?(a) 80286(b) MIPS(c) Zilog Z80(d) 80386I had been asked this question during an online exam.This key question is from Processor of Embedded System in division Embedded System of Embedded Systems

Answer» RIGHT option is (B) MIPS

The explanation: MIPS POSSESS a RISC architecture whereas 80386, 80286 and Zilog Z80 areCISC architectures.
26.

Name a volatile memory.(a) RAM(b) EPROM(c) ROM(d) EEPROMThe question was posed to me in an online interview.Question is taken from Memory and Peripherals of Embedded System in chapter Embedded System of Embedded Systems

Answer»

Right option is (a) RAM

The best EXPLANATION: Volatile MEMORY is those which can ACCESS data only when the device is powered.

27.

Which of the following is an 8-bit command in MC68HC11?(a) Add(b) Shift(c) Multiply(d) SubtractThe question was posed to me in examination.This intriguing question comes from Microcontroller of Embedded System topic in portion Embedded System of Embedded Systems

Answer»

Correct answer is (C) Multiply

For explanation I would SAY: MULTIPLYING two 8 bit requires a 16-bit register.

28.

It retains its content when power is removed. What type of memory is this?(a) Volatile memory(b) Nonvolatile memory(c) RAM(d) SRAMI got this question in exam.I'm obligated to ask this question of Memory and Peripherals of Embedded System in chapter Embedded System of Embedded Systems

Answer»

Right option is (B) Nonvolatile memory

Easiest explanation: Nonvolatile devices are those which always RETAINS it CONTENT even when any abrupt change occurs and nonvolatile memory are a kind of such devices. But RAM is a volatile memory which is primary storage that can only access its data only when the DEVICE is powered and SRAM is a type of RAM which is called Static RAM.

29.

Which is the concatenated register of MC68HC11?(a) D(b) X(c) IP(d) DII got this question in my homework.Question is taken from Microcontroller of Embedded System in chapter Embedded System of Embedded Systems

Answer» RIGHT ANSWER is (a) D

The best explanation: The MC68HC11 architecture is similar to that of the 6800 and has two 8 bit accumulators referred to as registers A and B.They are CONCATENATED to provide a 16-bit double accumulator CALLED REGISTER D.
30.

What kind of socket does an external EPROM to plugged in for prototyping?(a) Piggyback(b) Single socket(c) Multi-socket(d) Piggyback reset socketThis question was posed to me in final exam.The above asked question is from Memory and Peripherals of Embedded System in division Embedded System of Embedded Systems

Answer»

The correct choice is (a) Piggyback

For EXPLANATION: Some controllers USE a special PACKAGE called piggyback socket on the TOP of the package to allow the EPROM for prototyping.

31.

What kind of visual panel is used for seven segmented display?(a) LED(b) LCD(c) Binary output(d) Analogue outputThe question was posed to me in examination.The doubt is from Memory and Peripherals of Embedded System in chapter Embedded System of Embedded Systems

Answer»

Correct option is (B) LCD

For explanation I would SAY: None.

32.

Which one of the following offers CPUs as integrated memory or peripheral interfaces?(a) Microcontroller(b) Microprocessor(c) Embedded system(d) Memory systemI have been asked this question in a job interview.This question is from Processor of Embedded System topic in portion Embedded System of Embedded Systems

Answer»

Correct option is (a) Microcontroller

The EXPLANATION is: Microcontrollers are the CPUS which have INTEGRATED memory and peripherals but microprocessor possesses external CHIPS for memory.

33.

Which one of the following is board based system?(a) Data bus(b) Address bus(c) VMEbus(d) DMA busThe question was posed to me in an international level competition.This interesting question is from Processor of Embedded System topic in portion Embedded System of Embedded Systems

Answer»

The correct answer is (c) VMEbus

The explanation is: VMEbus is Versa MODULE Europa Bus which is used as a BOARD BASED system for easy manipulation. VMEbus is a computer bus standard developed for the Motorola MC6800 family and is mainly based on Eurocard sizes.

34.

Which of the following are external pins whose logic state can be controlled by the processor to either be a logic zero or logic one is known as(a) Analogue value(b) Display values(c) Binary values(d) Time derived digital outputsI have been asked this question during an interview for a job.This is a very interesting question from Memory and Peripherals of Embedded System in chapter Embedded System of Embedded Systems

Answer»

The CORRECT option is (c) Binary values

For explanation: Binary values possess LOGIC ZEROS and logic ones.

35.

Which of the following microprocessor is designed by Zilog?(a) Z80(b) Zigbee(c) 80386(d) 8087I got this question in quiz.The question is from Microprocessor of Embedded System in portion Embedded System of Embedded Systems

Answer»

Right answer is (a) Z80

The BEST I can EXPLAIN: Designed by Zilog in 1976. 80386 and 8087 are the processors designed by Intel and Zigbee is IEEE based which is used for high-level COMMUNICATION PROTOCOL.

36.

What type of memory is suitable for high volume production?(a) RAM(b) ROM(c) EPROM(d) EEPROMI have been asked this question in quiz.My question is based upon Memory and Peripherals of Embedded System topic in division Embedded System of Embedded Systems

Answer»

The correct ANSWER is (B) ROM

To EXPLAIN I would say: Read Only Memory is suitable for HIGH volume PRODUCTION since it is a nonvolatile memory.

37.

Which of the following possesses a CISC architecture?(a) MC68020(b) ARC(c) Atmel AVR(d) BlackfinThe question was asked in an internship interview.The query is from Processor of Embedded System in division Embedded System of Embedded Systems

Answer»

Right answer is (a) MC68020

Best explanation: MC68020 is having a CISC architecture. CISC architecture is used for code efficiency whereas RISC architecture is used for speeding up the PROCESSOR. ARC, Atmel AVR, and Blackfin are RISC ARCHITECTURES.

38.

What does m1 signal in Z80 describes?(a) I/O operation status(b) Memory refresh output(c) Output pulse on instruction fetch cycle(d) Interrupt request inputI got this question in an online quiz.The above asked question is from Microprocessor of Embedded System in portion Embedded System of Embedded Systems

Answer»

Right choice is (c) Output pulse on instruction fetch cycle

Easy explanation: It is a signal which describes output pulse on the instruction fetch cycle. Interrupt REQUEST input, input/output OPERATION status, memory refresh output are the other SIGNALS in Z80 for various OPERATIONS.

39.

By which instruction does the switching of registers take place?(a) Instruction opcodes(b) AXX instruction(c) EXX instruction(d) Register instructionI got this question during an interview.My question comes from Microprocessor of Embedded System topic in chapter Embedded System of Embedded Systems

Answer»

Correct option is (c) EXX instruction

Explanation: Only one SET of REGISTERS can be USED at one time and the switching of registers and data transfer is performed by the EXX instruction.

40.

Flag register of Z80 is also known as(a) Program status register(b) Program status address(c) Program status word(d) Program address registerThis question was addressed to me by my college professor while I was bunking the class.Asked question is from Microprocessor of Embedded System topic in chapter Embedded System of Embedded Systems

Answer»

Correct choice is (C) Program status word

To elaborate: The flag REGISTER of Z80 contains status INFORMATION such as carry, OVERFLOW, SIGNED etc.

41.

What does CCR stand for?(a) Condition code register(b) Computing code register(c) Complex code register(d) Code control registerThis question was posed to me in an online interview.This key question is from Microcontroller of Embedded System in division Embedded System of Embedded Systems

Answer»

Right ANSWER is (a) Condition CODE register

To EXPLAIN: Condition code register is a special register in the MC68HC11.

42.

Which signal is used to differentiates the access from a normal memory cycle?(a) HALT(b) RESET(c) MREQ(d) IORQThe question was posed to me in an international level competition.I'd like to ask this question from Microprocessor of Embedded System in portion Embedded System of Embedded Systems

Answer»

Right option is (d) IORQ

The EXPLANATION: The IORQ signal is used to DIFFERENTIATE the access from a normal MEMORY CYCLE. These input/output accesses are similar from a hardware perspective to a memory cycle but only occur when an input/output PORT instruction is executed.

43.

What is the bit size of the program counter in MC68HC05?(a) 7(b) 9(c) 13(d) 17The question was asked in unit test.Enquiry is from Microcontroller of Embedded System in portion Embedded System of Embedded Systems

Answer»

The correct ANSWER is (C) 13

The explanation is: MC68HC05 have a 13-bit PROGRAM counter.

44.

How many bits does an MC6800 family have?(a) 16(b) 32(c) 4(d) 8I have been asked this question in an online interview.My question is from Processor of Embedded System topic in section Embedded System of Embedded Systems

Answer»

The CORRECT OPTION is (d) 8

Easiest EXPLANATION: MC6800 is an 8-bit processor proposed by Motorola.

45.

What are the two register sets used in Z80?(a) C’D’ and BC’(b) CD and BD(c) IV and MR(d) Main and alternateI had been asked this question at a job interview.This interesting question is from Microprocessor of Embedded System in portion Embedded System of Embedded Systems

Answer»

The CORRECT answer is (d) Main and alternate

To elaborate: Z80 have TWO SETS of registers which are the main registers and alternate registers.

46.

Which is the first microcontroller?(a) 8051(b) Arm(c) TMS1000(d) Intel 4004I have been asked this question during an interview.I would like to ask this question from Microcontroller of Embedded System topic in division Embedded System of Embedded Systems

Answer» CORRECT choice is (c) TMS1000

Explanation: TMS1000 is the first MICROCONTROLLER which was done in April 1971 but Intel4004was designed in NOVEMBER 1971.
47.

How is the protection and security for an embedded system made?(a) OTP(b) IPR(c) Memory disk security(d) Security chipsThis question was posed to me during an interview.My question comes from Processor of Embedded System topic in portion Embedded System of Embedded Systems

Answer»

The correct ANSWER is (b) IPR

To explain I would say: Intellectual property RIGHT PROVIDES SECURITY and protection to embedded systems.

48.

How the input terminals are associated with external environments?(a) Actuators(b) Sensors(c) Inputs(d) OutputsI have been asked this question during an interview for a job.My question is taken from Memory and Peripherals of Embedded System topic in section Embedded System of Embedded Systems

Answer»

The correct choice is (b) Sensors

The EXPLANATION is: Sensors MEASURES the physical QUANTITY and CONVERT it into electrical means whereas actuators convert electrical quantity into physical quantity.

49.

Which is the single device capable of providing prototyping support for a range of microcontroller?(a) ROM(b) Umbrella device(c) OTP(d) RAMThis question was posed to me in an online quiz.Question is from Memory and Peripherals of Embedded System in section Embedded System of Embedded Systems

Answer» CORRECT choice is (b) Umbrella device

The best I can EXPLAIN: Umbrella device is capable of providing prototyping SUPPORT for a range of MICROCONTROLLERS.