Code: DE10                                                                    Subject: COMPUTER ENGINEERING

Time: 3 Hours                                                                                                     Max. Marks: 100

NOTE: There are 9 Questions in all.

· Question 1 is compulsory and carries 20 marks. Answer to Q. 1. must be written in the space provided for it in the answer book supplied and nowhere else.

· Out of the remaining EIGHT Questions answer any FIVE Questions. Each question carries 16 marks.

· Any required data not explicitly given, may be suitably assumed and stated.

Q.1       Choose the correct or best alternative in the following:                                         (2x10)

      a.     When the USART 8251 has to transmit data

(A) (B)

(C) (D)

2. After the execution of CMA instruction

(A) No flags are affected.                          

(B) All flags are affected.                           

(C) Carry flag is set.   

(D) S, Z, P are not affected, CY and AC effected as per results.

c. Flash memory is a special type of 

(A)  SRAM                                                (B)  DRAM          

(C)  EPROM                                             (D)  EEPROM

4. A computer program that converts an entire program into machine language at one time is called a/an

(A)  Interpreter.                                          (B)  Loader.                      

      (C)  Compiler.                          (D)  Assembler.

5. In immediate addressing mode the operand is placed

(A)  In the CPU register.                             (B)  After opcode in the instruction.           

(C)  In the memory.                                    (D)  In the stack.

6. Address and data lines in 8085 are

(A)  Separate lines.                                    

(B)  Common line.     

(C)  Multiplexed – only lower byte of address. 

(D)  Shared line.

7. A stack organized computer has

(A)  Three - Address instructions.               (B)  Two - Address instructions.    

(C)  One - Address instructions.                 (D)  Zero - Address instructions.

8. In a computer the parallel port is represented by the

(A)  COM1.                                               (B)  COM2.          

            (C)  LPT1.                                                 (D)  RS232.

9. The information indicated by a lead pencil can be sensed by the use of

(A)  OCR.                                                  (B)  Card punch unit.         

(C)  OMR.                                                 (D)  Bar code reader.

10. Floppy disks are made from

(A)  Acrylic.                                               (B)  Polythene.      

(C)  Mica.                                                  (D)  Mylar.

Answer any FIVE Questions out of EIGHT Questions.

Each question carries 16 marks.

Q.2     a.   With reference to the processing speed of a microprocessor, explain the following terms:

                   MIPS, MFLOPS, TPS, KLIPS.                                                                        (4)

             b.   Explain the function of the following components of a computer.                          (8)

                   (i) Central Processing Unit (CPU)

                   (ii) Three types of Buses.

             c.   Write short notes on the application of computers in Medical field.                      (4)

  Q.3     a.   Name and explain the type of architecture that is used in the Pentium pro machine.              (1+6)

             b.   Explain about the Direct addressing, Register addressing and Immediate addressing modes with the help of suitable examples.                                (9)

Q.4     a    Draw and explain the timing diagram for memory-write cycle for Intel 8085.                       (6)

             b.   Explain how some special control signals are generated for memory and I/O devices.                      (6)

             c.   Give the steps performed to fetch an opcode from a memory location.                (4)

  Q.5     a.   Briefly explain the concept involved in cache memory. Explain the working of a write-through cache and write-back cache memory.                   (2+6)

             b.   Write short notes on Flash memory and EEPROM.                                        (4+4)

  Q.6     a.   Explain how 8251 USART is used for serial data transmission.                           (8)

             b.   Explain how an interrupt controller works. Name and explain the important signals available on the Intel 8259 chip with the help of the pin diagram.                                                         (8)

  Q.7     a.   Explain Raster scan and Vector scan methods of display.                                    (8)

             b.   Give the functions of the following commands of Disk Operating System(DOS).

                   DISKCOPY, TREE, CHKDSK, SYS                                                              (4)

             c.   Give the major functions of UNIX kernel.                                                           (4)

  Q.8     a.   What is a stack? Explain how data is transferred from the stack and to the stack.                (6)

             b.   Compare the LINUX and UNIX operating systems.                                           (4)

             c.   What does BIOS stand for? What is the function of ROM-BIOS? Name the services provided by ROM-BIOS.                                                                                                               (6)

Q.9     a.   What is MCA bus? Is MCA bus compatible to EISA bus?                                 (4)

             b.   What are the advantages of a PCI bus over VESA’s Local bus?                         (4)

             c.   Name the three IC’s included in an EISA chipset. Explain about them in brief.                    (8)