Basic Electrical Interview Questions
1)Give two basic speed control scheme of DC shunt motor?
Answer:1. By using flux control method:in this method a rheostat is connected across the field winding to control the field current.so by changing the current the flux produced by the field winding can be changed, and since speed is inversely proportional to flux speed can be controlled 2.armature control method:in this method a rheostat is connected across armature winding by varying the resistance the value of resistive drop(IaRa)can be varied,and since speed is directly proportional to Eb-IaRa the speed can be controlled.
2)What is the principle of motor?
Answer:Whenever a current carrying conductor is placed in an magnetic field it produce turning or twisting movement is called as torque.
3)What is meant by armature reaction?
Answer:The effect of armature flu to main flux is called armature reaction. The armature flux may support main flux or opposes main flux.
4)Give two basic speed control scheme of DC shunt motor?
Answer:1. By using flux control method:in this method a rheostat is connected across the field winding to control the field current.so by changing the current the flux produced by the field winding can be changed, and since speed is inversely proportional to flux speed can be controlled 2.armature control method:in this method a rheostat is connected across armature wdg.by varying the resistance the value of resistive drop(IaRa)can be varied,and since speed is directly proportional to Eb-IaRa the speed can be controlled.
5)What is the difference between synchronous generator & asynchronous generator?
Answer:In simple, synchronous generator supply's both active and reactive power but asynchronous generator(induction generator) supply's only active power and observe reactive power for magnetizing.This type of generators are used in windmills.
6)What is the Polarization index value ? (pi value)and simple definition of polarization index ?
Answer:Its ratio between insulation resistance(IR)i.e meggar value
for 10min to insulation resistance for 1 min. It ranges from 5-7 for new motors & normally for motor to be in good condition it should be Greater than 2.5 .
7)Why syn. generators r used for the production of electricity?
Answer:synchronous machines have capability to work on different power factor(or say
different imaginary power varying the field emf. Hence syn. generators r used for the production of electricity.
8)What is the difference between synchronous generator & asynchronous generator?
Answer:In simple, synchronous generator supply's both active and reactive power but asynchronous generator(induction generator) supply's only active power and observe reactive power for magnetizing.This type of generators are used in windmills.
9)1 ton is equal to how many watts?
Answer:1 ton = 12000 BTU/hr and to convert BTU/hr to horsepower,
12,000 * 0.0003929 = 4.715 hp therefore 1 ton = 4.715*.746 = 3.5 KW.
10)Why syn. generators r used for the production of electricity?
Answer:Synchronous machines have capability to work on differentpower factor(or say
different imaginary pow varying the field emf. Hence syn. generators r used for the production of electricity.
11)Enlist types of dc generator?
Answer:D.C.Generators are classified into two types 1)separatly exicted d.c.generator 2)self exicted d.c.generator, which is further classified into;1)series 2)shunt and
3)compound(which is further classified into cumulative and differential).
Electrical interview faqs Part 2
Electrical interview faqs Part 2
1)Why, when birds sit on transmission lines or current wires doesn't get shock?
Answer:Its true that if birds touch the single one line (phase or neutral) they don't get electrical shock... if birds touch 2 lines than the circuit is closed and they get electrical shock.. so if a human touch single one line(phase) then he doesn't get shock if he is in the air (not touching - standing on the ground if he is standing on the ground then touching the line (phase) he will get a shock because the ground on what we standing is like line (ground bed - like neutral)। and in the most of electric lines the neutral is grounded..so that means that human who touch the line closes the circuit between phase and neutral.
2)What is meant by armature reaction?
Answer:The effect of armature flu to main flux is called armature reaction. The armature flux may support main flux or opposes main flux.
3)What happen if we give 220 volts dc supply to d bulb r tube light?
Answer:Bulbs [devices] for AC are designed to operate such that it offers high impedance to AC supply. Normally they have low resistance. When DC supply is applied, due to low resistance, the current through lamp would be so high that it may damage the bulb element.
4)Which motor has high Starting Torque and Staring current DC motor, Induction motor or Synchronous motor?
Answer:DC Series motor has high starting torque. We can not start the Induction motor and Synchronous motors on load, but can not start the DC series motor without load.
5)What is ACSR cable and where we use it?
Answer:ACSR means Aluminium conductor steel reinforced, this conductor is used in transmission & distribution.
6)What is vaccum currcuit breaker.define with cause and where be use it Device?
Answer:A breaker is normally used to break a ciruit. while breaking the circuit, the contact terminals will be separated. At the time of seperation an air gap is formed in between the terminals. Due to existing current flow the air in the gap is ionised and results in the arc. various mediums are used to quench this arc in respective CB's. but in VCB the medium is vaccum gas. since the air in the CB is having vaccum pressure the arc formation is interrupted. VCB's can be used upto 11kv.
7)What will happen when power factor is leading in distribution of power?
Answer:If their is high power factor, i.e if the power factor is close to one:
1.losses in form of heat will be reduced,
2.cable becomes less bulky and easy to carry, and very
cheap to afford, &
3. it also reduces over heating of tranformers.
8)Whats the one main difference between UPS & inverter ? And electrical engineering & electronics engineering ?
Answer:uninterrupt power supply is mainly use for short time . means according to ups VA it gives backup. ups is also two types : on line and offline . online ups having high volt and amp for long time backup with with high dc voltage.but ups start with 12v dc with 7 amp. but inverter is startwith 12v,24,dc to 36v dc and 120amp to 180amp battery with long time backup.
9)What is 2 phase motor?
Answer:A two phase motor is a motor with the the starting winding and the running winding have a phase split. e.g;ac servo motor.where the auxiliary winding and the control winding have a phase split of 90 degree.
10)Advantages of vvvf drives over non vvvf drives for EOT cranes?
Answer:1.smooth start and stop.
2.no jerking of load.
3.exact posiitoning
4.better protection for motor.
5.high/low speed selection.
6.reliability of break shoe.
7.programmable break control.
8.easy circutry
9.reduction in controls
10.increases motor life
11)What is the significance of vector grouping in Power Transformers?
Answer:Every power transformer has a vector group listed by its manufacturer. Fundamentally it tells you the information about how the windings are connected (delta or wye) and the phace difference betweent the current and voltage. EG. DYN11 means Delta primary, Wye Secondry and the current is at 11 o clock reffered to the voltage.
12)Which type of A.C motor is used in the fan (ceiling fan, exhaust fan, padestal fan, bracket fan etc) which are find in the houses ?
Answer:Its Single Phase induction motor which mostly squirrel cage rotor and are capacitor start capacitor run.
1)Why, when birds sit on transmission lines or current wires doesn't get shock?
Answer:Its true that if birds touch the single one line (phase or neutral) they don't get electrical shock... if birds touch 2 lines than the circuit is closed and they get electrical shock.. so if a human touch single one line(phase) then he doesn't get shock if he is in the air (not touching - standing on the ground if he is standing on the ground then touching the line (phase) he will get a shock because the ground on what we standing is like line (ground bed - like neutral)। and in the most of electric lines the neutral is grounded..so that means that human who touch the line closes the circuit between phase and neutral.
2)What is meant by armature reaction?
Answer:The effect of armature flu to main flux is called armature reaction. The armature flux may support main flux or opposes main flux.
3)What happen if we give 220 volts dc supply to d bulb r tube light?
Answer:Bulbs [devices] for AC are designed to operate such that it offers high impedance to AC supply. Normally they have low resistance. When DC supply is applied, due to low resistance, the current through lamp would be so high that it may damage the bulb element.
4)Which motor has high Starting Torque and Staring current DC motor, Induction motor or Synchronous motor?
Answer:DC Series motor has high starting torque. We can not start the Induction motor and Synchronous motors on load, but can not start the DC series motor without load.
5)What is ACSR cable and where we use it?
Answer:ACSR means Aluminium conductor steel reinforced, this conductor is used in transmission & distribution.
6)What is vaccum currcuit breaker.define with cause and where be use it Device?
Answer:A breaker is normally used to break a ciruit. while breaking the circuit, the contact terminals will be separated. At the time of seperation an air gap is formed in between the terminals. Due to existing current flow the air in the gap is ionised and results in the arc. various mediums are used to quench this arc in respective CB's. but in VCB the medium is vaccum gas. since the air in the CB is having vaccum pressure the arc formation is interrupted. VCB's can be used upto 11kv.
7)What will happen when power factor is leading in distribution of power?
Answer:If their is high power factor, i.e if the power factor is close to one:
1.losses in form of heat will be reduced,
2.cable becomes less bulky and easy to carry, and very
cheap to afford, &
3. it also reduces over heating of tranformers.
8)Whats the one main difference between UPS & inverter ? And electrical engineering & electronics engineering ?
Answer:uninterrupt power supply is mainly use for short time . means according to ups VA it gives backup. ups is also two types : on line and offline . online ups having high volt and amp for long time backup with with high dc voltage.but ups start with 12v dc with 7 amp. but inverter is startwith 12v,24,dc to 36v dc and 120amp to 180amp battery with long time backup.
9)What is 2 phase motor?
Answer:A two phase motor is a motor with the the starting winding and the running winding have a phase split. e.g;ac servo motor.where the auxiliary winding and the control winding have a phase split of 90 degree.
10)Advantages of vvvf drives over non vvvf drives for EOT cranes?
Answer:1.smooth start and stop.
2.no jerking of load.
3.exact posiitoning
4.better protection for motor.
5.high/low speed selection.
6.reliability of break shoe.
7.programmable break control.
8.easy circutry
9.reduction in controls
10.increases motor life
11)What is the significance of vector grouping in Power Transformers?
Answer:Every power transformer has a vector group listed by its manufacturer. Fundamentally it tells you the information about how the windings are connected (delta or wye) and the phace difference betweent the current and voltage. EG. DYN11 means Delta primary, Wye Secondry and the current is at 11 o clock reffered to the voltage.
12)Which type of A.C motor is used in the fan (ceiling fan, exhaust fan, padestal fan, bracket fan etc) which are find in the houses ?
Answer:Its Single Phase induction motor which mostly squirrel cage rotor and are capacitor start capacitor run.
Electrical interview Faqs
Electrical interview Faqs
1)What is electric traction?
Answer:Traction means using the electric power for traction system i.e. for railways,trams, trolleys etc. electric traction means use of the electricity for all these . now a days, magnetic traction is also used for bullet trains. basically dc motors are used for electric traction systems.
2)How can you start-up the 40w tube lite with 230v AC/DC without using any choke/Coil?
Answer:It's possible by means of Electronic choke.otherwise it's not possible to ionize the particles in tube. light, with normal voltage.
3)What is "pu" in electrical engineering?
Answer:Pu stands for per unit and this will be used in power system single line diagram there it is like a huge electrical circuit with no of componenes (generators, transformers, loads) with different ratings (in MVA and KV). To bring all the ratings into common platform we use pu concept in which, in general largest MVA and KV ratings of the component is considered as base values, then all other component ratings will get back into this basis.Those values are called as pu values. (p.u=actual value/base value).
4)Operation carried out in Thermal power station?
Answer:The water is obtained in the boiler and the coal is burnt so that steam is obtained this steam is allowed to hit the turbine , the turbine which is coupled with the generator generates the electricity
5)Why link is provided in neutral of an ac circuit and fuse in phase of ac circuit?
Answer:Link is provided at a Neutral common point in the circuit from which various connection are taken for the individual control circuit and so it is given in a link form to withstand high Amps. But in the case of Fuse in the Phase of AC circuit it is designed such that the fuse rating is calculated for the particular circuit (i.e load) only.So if any malfunction happen the fuse connected in the particular control circuit alone will blow off.
6)what is the diff. btwn. electronic regulator and ordinary rheostat regulator for fans?
Answer:The difference between the electronic and ordinary regulator is that in electronic reg. power losses are less because as we decrease the speed the electronic reg. give the power needed for that particular speed but in case of ordinary rheostat type reg. the power wastage is same for every speed and no power is saved.In electronic regulator triac is employed for speed control.by varying the firing angle speed is controlled but in rheostatic control resistance is decreased by steps to achieve speed control.
7)How tube light circuit is connected and how it works?
Answer:A choke is connected in one end of the tube light and a starter is in series with the circuit. When supply is provided ,the starter will interrupt the supply cycle of AC. Due to the sudden change of supply the chock will generate around 1000volts . This volt will capable of to break the electrons inside the tube to make electron flow. once the current passes through the tube the starter circuit will be out of part. now there is no change of supply causes choke voltage normalized and act as minimize the current.
8)whats is MARX CIRCUIT?
Answer:It is used with generators for charging a number of capacitor in parallel and discharging them in series.It is used when voltage required for testing is higher than the available.
9)What is encoder, how it function?
Answer:An encoder is a device used to change a signal (such as a bitstream) or data into a code. The code may serve any of a number of purposes such as compressing information for transmission or storage, encrypting or adding redundancies to the input code, or translating from one code to another. This is usually done by means of a programmed algorithm,especially if any part is digital, while most analog encoding is done with analog circuitry.
10)What are the advantages of speed control using thyristor?
Answer:Advantages :1. Fast Switching Characterstics than Mosfet, BJT, IGBT 2. Low cost 3. Higher Accurate.
11)Why Human body feel Electric shock ?? n in an Electric train during running , We did nt feel any Shock ? why?
Answer:Unfortunately our body is a pretty good conductor of electricity, The golden rule is Current takes the lowest resistant path if you have insulation to our feet as the circuit is not complete (wearing rubber footwear which doing some repairs is advisable as our footwear is a high resistance path not much current flows through our body).The electric train is well insulated from its electrical system.
12)what is the principle of motor?
Answer:Whenever a current carrying conductor is placed in an magnetic field it produce turning or twisting movemnt is called as torque.
1)What is electric traction?
Answer:Traction means using the electric power for traction system i.e. for railways,trams, trolleys etc. electric traction means use of the electricity for all these . now a days, magnetic traction is also used for bullet trains. basically dc motors are used for electric traction systems.
2)How can you start-up the 40w tube lite with 230v AC/DC without using any choke/Coil?
Answer:It's possible by means of Electronic choke.otherwise it's not possible to ionize the particles in tube. light, with normal voltage.
3)What is "pu" in electrical engineering?
Answer:Pu stands for per unit and this will be used in power system single line diagram there it is like a huge electrical circuit with no of componenes (generators, transformers, loads) with different ratings (in MVA and KV). To bring all the ratings into common platform we use pu concept in which, in general largest MVA and KV ratings of the component is considered as base values, then all other component ratings will get back into this basis.Those values are called as pu values. (p.u=actual value/base value).
4)Operation carried out in Thermal power station?
Answer:The water is obtained in the boiler and the coal is burnt so that steam is obtained this steam is allowed to hit the turbine , the turbine which is coupled with the generator generates the electricity
5)Why link is provided in neutral of an ac circuit and fuse in phase of ac circuit?
Answer:Link is provided at a Neutral common point in the circuit from which various connection are taken for the individual control circuit and so it is given in a link form to withstand high Amps. But in the case of Fuse in the Phase of AC circuit it is designed such that the fuse rating is calculated for the particular circuit (i.e load) only.So if any malfunction happen the fuse connected in the particular control circuit alone will blow off.
6)what is the diff. btwn. electronic regulator and ordinary rheostat regulator for fans?
Answer:The difference between the electronic and ordinary regulator is that in electronic reg. power losses are less because as we decrease the speed the electronic reg. give the power needed for that particular speed but in case of ordinary rheostat type reg. the power wastage is same for every speed and no power is saved.In electronic regulator triac is employed for speed control.by varying the firing angle speed is controlled but in rheostatic control resistance is decreased by steps to achieve speed control.
7)How tube light circuit is connected and how it works?
Answer:A choke is connected in one end of the tube light and a starter is in series with the circuit. When supply is provided ,the starter will interrupt the supply cycle of AC. Due to the sudden change of supply the chock will generate around 1000volts . This volt will capable of to break the electrons inside the tube to make electron flow. once the current passes through the tube the starter circuit will be out of part. now there is no change of supply causes choke voltage normalized and act as minimize the current.
8)whats is MARX CIRCUIT?
Answer:It is used with generators for charging a number of capacitor in parallel and discharging them in series.It is used when voltage required for testing is higher than the available.
9)What is encoder, how it function?
Answer:An encoder is a device used to change a signal (such as a bitstream) or data into a code. The code may serve any of a number of purposes such as compressing information for transmission or storage, encrypting or adding redundancies to the input code, or translating from one code to another. This is usually done by means of a programmed algorithm,especially if any part is digital, while most analog encoding is done with analog circuitry.
10)What are the advantages of speed control using thyristor?
Answer:Advantages :1. Fast Switching Characterstics than Mosfet, BJT, IGBT 2. Low cost 3. Higher Accurate.
11)Why Human body feel Electric shock ?? n in an Electric train during running , We did nt feel any Shock ? why?
Answer:Unfortunately our body is a pretty good conductor of electricity, The golden rule is Current takes the lowest resistant path if you have insulation to our feet as the circuit is not complete (wearing rubber footwear which doing some repairs is advisable as our footwear is a high resistance path not much current flows through our body).The electric train is well insulated from its electrical system.
12)what is the principle of motor?
Answer:Whenever a current carrying conductor is placed in an magnetic field it produce turning or twisting movemnt is called as torque.
Os concepts Interview Questions and Faqs
Os Interview Questions and Faqs
1)What is MUTEX ?
2)What isthe difference between a 'thread' and a 'process'?
3)What is INODE?
4)Explain the working of Virtual Memory.
5)How does Windows NT supports Multitasking?
6)Explain the Unix Kernel.
7)What is Concurrency? Expain with example Deadlock and Starvation.
8)What are your solution strategies for "Dining Philosophers Problem" ?
9)Explain Memory Partitioning, Paging, Segmentation.
10)Explain Scheduling.
11)Operating System Security.
12)What is Semaphore?
13)Explain the following file systems : NTFS, Macintosh(HPFS), FAT .
14)What are the different process states?
15)What is Marshalling?
16)Define and explain COM?
17)What is Marshalling?
18)Difference - Loading and Linking ?
19)What are the basic functions of an operating system?
20)Explain briefly about, processor, assembler, compiler, loader, linker and the functions executed by them.
21)What are the difference phases of software development? Explain briefly?
22)Differentiate between RAM and ROM?
23)What is DRAM? In which form does it store data?
24)What is cache memory?
25)What is hard disk and what is its purpose?
26)Differentiate between Complier and Interpreter?
27)What are the different tasks of Lexical analysis?
28)What are the different functions of Syntax phase, Sheduler?
29)What are the main difference between Micro-Controller and Micro- Processor?
30)Describe different job scheduling in operating systems.
31)What is a Real-Time System ?
32)What is the difference between Hard and Soft real-time systems ?
33)What is a mission critical system ?
34)What is the important aspect of a real-time system ?
35)If two processes which shares same system memory and system clock in a distributed system, What is it called?
36)What is the state of the processor, when a process is waiting for some event to occur?
37)What do you mean by deadlock?
38)Explain the difference between microkernel and macro kernel.
Give an example of microkernel.
39)When would you choose bottom up methodology?
40)When would you choose top down methodology?
41)Write a small dc shell script to find number of FF in the design.
42)Why paging is used ?
43)Which is the best page replacement algorithm and Why? How much time is spent usually in each phases and why?
44)Difference between Primary storage and secondary storage?
45)What is multi tasking, multi programming, multi threading?
46)Difference between multi threading and multi tasking?
47)What is software life cycle?
48)Demand paging, page faults, replacement algorithms, thrashing, etc.
49)Explain about paged segmentation and segment paging
50)While running DOS on a PC, which command would be used to duplicate the entire diskette?
1)What is MUTEX ?
2)What isthe difference between a 'thread' and a 'process'?
3)What is INODE?
4)Explain the working of Virtual Memory.
5)How does Windows NT supports Multitasking?
6)Explain the Unix Kernel.
7)What is Concurrency? Expain with example Deadlock and Starvation.
8)What are your solution strategies for "Dining Philosophers Problem" ?
9)Explain Memory Partitioning, Paging, Segmentation.
10)Explain Scheduling.
11)Operating System Security.
12)What is Semaphore?
13)Explain the following file systems : NTFS, Macintosh(HPFS), FAT .
14)What are the different process states?
15)What is Marshalling?
16)Define and explain COM?
17)What is Marshalling?
18)Difference - Loading and Linking ?
19)What are the basic functions of an operating system?
20)Explain briefly about, processor, assembler, compiler, loader, linker and the functions executed by them.
21)What are the difference phases of software development? Explain briefly?
22)Differentiate between RAM and ROM?
23)What is DRAM? In which form does it store data?
24)What is cache memory?
25)What is hard disk and what is its purpose?
26)Differentiate between Complier and Interpreter?
27)What are the different tasks of Lexical analysis?
28)What are the different functions of Syntax phase, Sheduler?
29)What are the main difference between Micro-Controller and Micro- Processor?
30)Describe different job scheduling in operating systems.
31)What is a Real-Time System ?
32)What is the difference between Hard and Soft real-time systems ?
33)What is a mission critical system ?
34)What is the important aspect of a real-time system ?
35)If two processes which shares same system memory and system clock in a distributed system, What is it called?
36)What is the state of the processor, when a process is waiting for some event to occur?
37)What do you mean by deadlock?
38)Explain the difference between microkernel and macro kernel.
Give an example of microkernel.
39)When would you choose bottom up methodology?
40)When would you choose top down methodology?
41)Write a small dc shell script to find number of FF in the design.
42)Why paging is used ?
43)Which is the best page replacement algorithm and Why? How much time is spent usually in each phases and why?
44)Difference between Primary storage and secondary storage?
45)What is multi tasking, multi programming, multi threading?
46)Difference between multi threading and multi tasking?
47)What is software life cycle?
48)Demand paging, page faults, replacement algorithms, thrashing, etc.
49)Explain about paged segmentation and segment paging
50)While running DOS on a PC, which command would be used to duplicate the entire diskette?
8086 Interview Questions Faqs
8086 Interview Questions Faqs
1)What are the flags in 8086?
In 8086 Carry flag, Parity flag, Auxiliary carry flag, Zero flag, Overflow flag, Trace flag, Interrupt flag, Direction flag, and Sign flag.
2)What are the various interrupts in 8086?
Maskable interrupts, Non-Maskable interrupts.
3)What is meant by Maskable interrupts?
An interrupt that can be turned off by the programmer is known as Maskable interrupt.
4)What is Non-Maskable interrupts?
An interrupt which can be never be turned off (ie.disabled) is known as Non-Maskable interrupt.
5)Which interrupts are generally used for critical events?
Non-Maskable interrupts are used in critical events. Such as Power failure, Emergency, Shut off etc.,
6)Give examples for Maskable interrupts?
RST 7.5, RST6.5, RST5.5 are Maskable interrupts
7)Give example for Non-Maskable interrupts?
Trap is known as Non-Maskable interrupts, which is used in emergency condition.
8)What is the Maximum clock frequency in 8086?
5 Mhz is the Maximum clock frequency in 8086.
9)What are the various segment registers in 8086?
Code, Data, Stack, Extra Segment registers in 8086.
10)Which Stack is used in 8086?
FIFO (First In First Out) stack is used in 8086.In this type of Stack the first stored information is retrived first.
11)What are the address lines for the software interrupts?
RST0 0000 H
RST1 0008 H
RST2 0010 H
RST3 0018 H
RST4 0020 H
RST5 0028 H
RST6 0030 H
RST7 0038 H
12)What is SIM and RIM instructions?
SIM is Set Interrupt Mask. Used to mask the hardware interrupts. RIM is Read Interrupt Mask. Used to check whether the interrupt is Masked or not.
13)Which is the tool used to connect the user and the computer? Interpreter is the tool used to connect the user and the tool.
14)What is the position of the Stack Pointer after the PUSH instruction? The address line is 02 less than the earlier value.
15)What is the position of the Stack Pointer after the POP instruction? The address line is 02 greater than the earlier value.
16)Logic calculations are done in which type of registers?Accumulator is the register in which Arithmetic and Logic calculations are done.
17)What are the different functional units in 8086?
Bus Interface Unit and Execution unit, are the two different functional units in 8086.
18)Give examples for Micro controller?
Z80, Intel MSC51 &96, Motorola are the best examples of Microcontroller.
19)What is meant by cross-compiler?
A program runs on one machine and executes on another is called as cross-compiler.
20)What are the address lines for the hardware interrupts?
RST 7.5 003C H
RST 6.5 0034 H
RST 5.5 002C H
TRAP 0024 H
20)Which Segment is used to store interrupt and subroutine return address registers?
Stack Segment in segment register is used to store interrupt and subroutine return address registers.
21)Which Flags can be set or reset by the programmer and also used to control the operation of the processor?
Trace Flag, Interrupt Flag, Direction Flag.
22)What does EU do?
Execution Unit receives program instruction codes and data from BIU, executes these instructions and store the result in general registers.
23)Which microprocessor accepts the program written for 8086 without any changes?
8088 is that processor.
24)What is the difference between 8086 and 8088?
The BIU in 8088 is 8-bit data bus & 16- bit in 8086.Instruction queue is 4 byte long in 8088and 6 byte in 8086.
1)What are the flags in 8086?
In 8086 Carry flag, Parity flag, Auxiliary carry flag, Zero flag, Overflow flag, Trace flag, Interrupt flag, Direction flag, and Sign flag.
2)What are the various interrupts in 8086?
Maskable interrupts, Non-Maskable interrupts.
3)What is meant by Maskable interrupts?
An interrupt that can be turned off by the programmer is known as Maskable interrupt.
4)What is Non-Maskable interrupts?
An interrupt which can be never be turned off (ie.disabled) is known as Non-Maskable interrupt.
5)Which interrupts are generally used for critical events?
Non-Maskable interrupts are used in critical events. Such as Power failure, Emergency, Shut off etc.,
6)Give examples for Maskable interrupts?
RST 7.5, RST6.5, RST5.5 are Maskable interrupts
7)Give example for Non-Maskable interrupts?
Trap is known as Non-Maskable interrupts, which is used in emergency condition.
8)What is the Maximum clock frequency in 8086?
5 Mhz is the Maximum clock frequency in 8086.
9)What are the various segment registers in 8086?
Code, Data, Stack, Extra Segment registers in 8086.
10)Which Stack is used in 8086?
FIFO (First In First Out) stack is used in 8086.In this type of Stack the first stored information is retrived first.
11)What are the address lines for the software interrupts?
RST0 0000 H
RST1 0008 H
RST2 0010 H
RST3 0018 H
RST4 0020 H
RST5 0028 H
RST6 0030 H
RST7 0038 H
12)What is SIM and RIM instructions?
SIM is Set Interrupt Mask. Used to mask the hardware interrupts. RIM is Read Interrupt Mask. Used to check whether the interrupt is Masked or not.
13)Which is the tool used to connect the user and the computer? Interpreter is the tool used to connect the user and the tool.
14)What is the position of the Stack Pointer after the PUSH instruction? The address line is 02 less than the earlier value.
15)What is the position of the Stack Pointer after the POP instruction? The address line is 02 greater than the earlier value.
16)Logic calculations are done in which type of registers?Accumulator is the register in which Arithmetic and Logic calculations are done.
17)What are the different functional units in 8086?
Bus Interface Unit and Execution unit, are the two different functional units in 8086.
18)Give examples for Micro controller?
Z80, Intel MSC51 &96, Motorola are the best examples of Microcontroller.
19)What is meant by cross-compiler?
A program runs on one machine and executes on another is called as cross-compiler.
20)What are the address lines for the hardware interrupts?
RST 7.5 003C H
RST 6.5 0034 H
RST 5.5 002C H
TRAP 0024 H
20)Which Segment is used to store interrupt and subroutine return address registers?
Stack Segment in segment register is used to store interrupt and subroutine return address registers.
21)Which Flags can be set or reset by the programmer and also used to control the operation of the processor?
Trace Flag, Interrupt Flag, Direction Flag.
22)What does EU do?
Execution Unit receives program instruction codes and data from BIU, executes these instructions and store the result in general registers.
23)Which microprocessor accepts the program written for 8086 without any changes?
8088 is that processor.
24)What is the difference between 8086 and 8088?
The BIU in 8088 is 8-bit data bus & 16- bit in 8086.Instruction queue is 4 byte long in 8088and 6 byte in 8086.
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