ANNA UNIVERSITY OF TECHNOLOGY, COIMBATORE B.E.,/B.TECH. DEGREE EXAMINATIONS: NOV/DEC 2011

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1 ANNA UNIVERSITY OF TECHNOLOGY, COIMBATORE B.E.,/B.TECH. DEGREE EXAMINATIONS: NOV/DEC 2011 REGULATIONS: 2008 FIFTH SEMESTER -CSE PC HARDWARE AND TROUBLESHOOTING PART A 1. What is meant by ISR? For a successful I/O completion interrupt, use of the data received from the input device can be started. In the case of output device another I/O operation can be initiated. For an interrupt due to unsuccessful I/O completion, the previous I/O operation can be retried. All these actions can be retrieved by programs. These programs are known as Interrupt Service Routine(ISR). 2. What are the types of OS?Give one example for each type. The Operating System may be of 6 types: Batch OS Interactive OS Time-sharing OS Multitasking/Multiprogramming OS Real-time OS Multiprocessor OS 3. Draw the block diagram for CRT Display monitor. S.KIRUTHIGA AP/CSE,CCET Page 1

2 4. Define the term DVD. DVD Digital Versatile Disk. The DVD is a new type of CD offering a storage capacity of 17GB. Using MPEG(Moving Pictures Expert Group) and Dolby compression techniques the DVD is an ideal multimedia peripheral device achieving theatre quality video and sound on a PC. 5. Differentiate between Hardware and Software interface. Hardware Interface: Serial Communication Separate data line and clock line Software Interface: Parallel port along with a serial to parallel converter Shared memory as display buffer 6. List the main units inside the system box. Switch Mode Power Supply Motherboard Motherboard Components Mode Switch Front Panel Indicators and Controls Speakers EPROM/ROM Types Floppy Disk Drives Hard Disk Drives 7. What is preventive maintenance? The PC is a machine with electrical and electronic circuits as well as electromechanical assemblies. For reliable operation and long life, the PC should be handled carefully. The computer should be operated gently without applying force. The computer room must be clean and Dust free. 8. What are the steps to be taken on finding a Virus? 1) Switch off the computer system to ensure that the virus in the memory does not spread anymore. 2) Confirm if the problem is actually because of the virus. It could be a hardware or other software related problem. 3) Boot from a clean write-protected floppy diskette. 4) Check your system for extent of infection and repair or delete all the infected files. 5) Check and remove the virus the virus from every floppy that was used in the system. S.KIRUTHIGA AP/CSE,CCET Page 2

3 9. How can we classify faults?why do we need such classifications? Solid fault: When there is a permanent fault in a computer, the computer behaves consistently. Any number of times the program is run, the result or symptoms will be the same. Intermittent fault: When there is an intermittent fault in a computer, the computer s behavior is not consistent. Sometimes it works properly and suddenly it malfunctions. After a certain period of time, it recovers from the fault automatically again atarts functioning properly. 10. List the steps involved in systematic troubleshooting. Systematic troubleshooting is the most powerful tool in the hands of an engineer. It is a scientific and analytical process. The systematic troubleshooting approach can be divided into the following steps: 1. Symptoms observation 2. Symptoms analysis 3. Fault diagnosis 4. Fault rectification S.KIRUTHIGA AP/CSE,CCET Page 3

4 PART B 11. (a) Explain in detail about the control unit(cu) with neat block diagram.(16) Hardware Resources Control Unit block diagram Flags: Interrupt Enable Overflow Hardwired and microprogrammed Control Unit Block diagram of Microprogrammed control unit (b)discuss about the following. (16) (i) Virtual memory Program folding Page fault Diagram Virtual memory concept Advantages of virtual memory Logical address and physical address Virtual memory mechanism (ii)cache memory Diagram Cache Memory Page replacement Hit/Miss ratio Write-through or Write-back policy 12. a) Describe about the printer and its type in detail. (16) Diagram Printer Block Diagram Printer Characteristic Printer types Impact and Non-impact printer Character printer and Line printer Draft, LQP and NLQ printer Parallel Interface and serial Interface Unidirectional and Bidirectional printers Daisy Wheel printer Dot Matrix printer Golf Ball printer Thermal printer Laser printer LED printer Ink Jet printer S.KIRUTHIGA AP/CSE,CCET Page 4

5 b) Explain in detail about the HDD and its type. (16) Removable Disk Drive and Fixed Disk Drive Moving Head and Fixed Head Disk Drive Single Head Assembly and Dual Head Assembly Winchester and Non-Winchester Disk Drive Open-Loop and Closed- Loop Disk Drive Diagram - Closed-Loop Positioning System Size and Capacity Hard Disk Drive ganisation Data ganisation on Hard Disk 13. a) Explain in detail about the PC family and PC hardware with neat functional diagram. PC Family OG: Difference between a PC-AT, PC and PC-XT PC family IBM PC and Clones PC/AT Major new features PC Family NG : Additional Features in Clones PC Hardware OG: o Diagram Block Diagram of a PC System Functional Block Diagram of a PC 8088 Microprocessor o CPU o Peripherals PC Hardware NG b) Draw the block diagram for motherboard logic and explain in detail. (16) Diagram Motherboard Logic Reset Logic Diagram - Reset Logic Keyboard Interface Diagram - Keyboard Interface Interrupt Logic Diagram - Interrupt Logic S.KIRUTHIGA AP/CSE,CCET Page 5

6 RAM Parity Logic Diagram - RAM Parity Logic NMI Logic Diagram - NMI Logic Memory Refresh Logic Diagram DMA Refresh Logic Wait State Logic Diagram Wait State Logic Bus Arbitration Logic Diagram Bus Arbitration Logic RAM Logic Diagram - RAM Logic CPU Logic Diagram - CPU Logic DMA Logic Diagram - DMA Logic New generation Motherboard logic 14. a) Explain in detail about the PC assembling and Integration. (16) System box preparation Motherboard stuffing Motherboard Installation IDE Drives Preparation Drive Installation Daughterboard s Installation Cables Connection Power Connection BLOS setup Loading Software b) Discuss about the DOS and how it gets control with activation sequence. (16) S.KIRUTHIGA AP/CSE,CCET Page 6 Anatomy of DOS IO.SYS MSDOS.SYS COMMAND.COM DOS : The Command Processor Internal Commands External Commands Sample External Commands of DOS Special files

7 How DOS gets Control DOS : The Resource Manager Standard Formats Floppy Diskette: Physical ganisation Logical ganisaion of the disk space Files area System area Boot record File allocation table Root directory 15. a) Explain in detail about the multidimentional view to be applied in fault diagnosis. (16) Fault diagnosis: Architecture ganisation Engineering layout Environment b) Explain in detail about the fault elimination process. (16) Common fault elimination steps Dead system Spurious problems Security failures Heart beats: Keyboard Flash Memory Refresh Request Timer 0-Ticks Multiple Faults: Voltage Spikes Short Circuit Defective Power Supply Wrong Operation S.KIRUTHIGA AP/CSE,CCET Page 7

UNIT 5 TROUBLESHOOTING PART A

UNIT 5 TROUBLESHOOTING PART A 1) What are all the factors that a successful troubleshooting depends on? Successful troubleshooting depends on the following factors: 1. Problem solving approach 2. Techniques