Final Examination Semester 2 / Year 2011

Transcription

1 Southern College Kolej Selatan 南方学院 Final Examination Semester 2 / Year 2011 COURSE : COMPUTER SYSTEM COURSE CODE : CSIS 1003 TIME : 2 HOURS 30 MINUTES DEPARTMENT : COMPUTER SCIENCE LECTURER : DR. LEE ZHI SAM Student s ID : Batch No. : Notes to candidates: 1) The question paper consists of 4 pages and 16 questions. 2) Answer all questions in section A and C. Answer only 4 questions in section B 3) The full marks for this question paper is ) Return the question paper with your answer booklet.

2 Section A: Choose one proper answer for the following questions. (10 questions X 2 marks= The model is the basis for today s computers. A. Leibnitz B. Von Neumann C. Pascal D. Charles Babbage 2. According to the von Neumann model, stored in memory. A. only data is B. only programs are C. data and programs are D. (none of the above) 3. For an 8-bit allocation, the smallest decimal number that can be represented in two s complement form is. A. -8 B C D If the exponent in Excess_127 is binary , the exponent in decimal is. A. 6 B. 7 C. 8 D For the binary operator, if the input is two 1s, the output is 0. A. AND B. OR C. XOR 6. In the graphic method of representing an image in a computer, the image is decomposed into a combination of geometrical figures. A. Bitmap B. Vector C. Quantized D. Binary 1/4

3 7. When we want to store music in a computer, the audio signal must be. A. Sampled B. Quantized C. Coded 8. A register in a CPU can hold. A. Data B. Instructions C. Program counter values 9. is a stand-alone storage location that holds data temporarily. A. An ALU B. A register C. A control unit D. A tape drive 10. The protocol is one of the protocols in the transport layer. A. TCP B. UDP C. SCTP 2/4

4 Section B: Short answer questions. Choose any 2 questions to answer. (2 questions x 20 marks = 40) Question 1 (20 : a) Please show how to convert hexadecimal number (B2A.23) 16 to decimal. (5 b) Please show how to convert octal number (22.23) 8 to decimal. (5 c) Store decimal number (7) 10 in an 8 bit location using unsigned representation. (5 d) Store decimal number (258) 10 in an 8 bit location using unsigned representation. (5 Question 2 (20 : a) Store decimal number (-10) 10 in an 8 bit location using sign and magnitude representation. (5 b) Retrieve the integer that stored as in sign and magnitude representation. (5 c) Store -20 in a 8 bit memory location using two s compliment representation. (5 d) Retrieve the integer that is stored as in memory using two s compliment format. (5 Question 3 (20 : a) With Excess system_127, please fill in the blank. (2 Name Sign Exponent Mantissa Number of bits b) Show the Excess system_127 (single precision) representation of the decimal number Show your steps and fill final answer into given table. (12 Sign Exponent Mantissa c) Convert decimal number to binary number. (3 3/4

5 d) Convert octal number (711.23) 8 to binary number. (3 Question 4: a) The following bit pattern is stored in Excess_127 format. Retrieve the bit pattern to decimal value. (12 Marks) S E M b) Retrieve the integer that stored as in sign and magnitude representation. (4 c) Convert binary number ( ) 2 to octal number. (4 Section C: Essay questions. Answer all given questions. (2 questions x 20 marks= 40) Question 1 : The director of Southern Company is interested to know more about the TCP/IP. You are required to explain to him the layers involved when a message is sent from device A to device B in the TCI/IP and the main function of each layer. Draw a figure to illustrate the scenario.(20. (Hints: Explain Application, Transport, Network, Data link and Physical layer as well) Question 2: The Southern Company is planning to enhance the computer of the office. You were ask to give a brief about the computer organization. a) Give a brief regarding to central processing unit (CPU). Explain what register and control unit are. (6 b) Explain what is main memory and address space. (4 c) If a computer has 64 MB of memory. Each word in this computer is four bytes. How many bits are needed to address any single word in memory? (4 d) Use a figure to illustrates the idea of memory hierarchy to your IT director. The figure should giving the idea about cost and performance. ( /4