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Choose the correct answer of the following (2 x 10) 1. In negative logic level 1 of the digital circuit is indicated by (a) 15 v (b) 10 v (c) 5 v (d) 0 v 2. The fetch cycle is (a) first part of instruction cycle (b) last part of instruction cycle (c) intermediate part of instruction cycle (d) None of the above 3. An arithmetic shift-right is equivalent to (a) multiplying the number by 2 (b) dividing the number by 2 (c) changing the sign of the number (d) reversing the number 4. Conversion of hexadecimal number 6B2 to its binary number equivalent is (a) 111100011011 (b) 011011010101 (c) 011010110010 (d) 011011000010 5. What will be the binary equiva lent of (24.1875) 10 ? (a) (11100.0011) (b) (11001.0101) (c) (10110.0011) (d) None of the above 6. The part of machine level instruction, which tells the central processor what needs to be done is (a) Operation code (b) Address (c) Operand (d) None of the above 7. The output of the following circuit is (a) A̅ B̅ (b) AB (c) A + B (d)...

Multiple Choice Questions (2 x 10) 1. Which determines the address of I/O interface? (a) Register select (b) Chip select (c) Both of above (d) None of above 2. Whenever the CPU detects an interrupt, what is done with the current state? (a) Save it (b) Discard it (c) Depends on the system to system (d) First finish it 3. A microprogram is sequencer perform the operation? (a) Read (b) Write (c) Read and Write (d) Read and Execute 4. Which among following is an important data transfer technique? (a) CAD (b) CAM (c) DMA (d) MMA 5. RISC stands for? (a) Risk Instruction Source Computer (b) Reduced Instruction Set Computer (c) Risk Instruction Set Computer (d) Risk Instruction Set Computing 6. The performance of the cache memory is measured in terms of? (a) Hit Ratio (b) Chat Ratio (c) Copy Ratio (d) Data Ratio 7. A set of physical addresses is also known as? (a) Disk Space (b) Address Space (c) Memory Space (d) Locations 8. Which interrupt establishes a priority over ...

Choose the correct answer for the following (2 x 10) 1. The master clock supplies a constant ⸻ to all parts in a register. (a) bit (b) beat (c) clock pulse (d) None of the above 2. Binary equivalent of (41.6875) 10  is (a) (101001.1011) 2 (b) (101101.1011) 2 (c) (101001.1001) 2 (d) (101011.1001) 2 3. Given a number N in base "r" having n digits, the (r - l)’s complement of N is defined as (a) (r n  - l) - N (b) N - (r n  - l) (c) r n  - (N - 1) (d) (r - l) - N n 4. A number of storage registers connected to a common operational unit are called (a) RAM (b) ROM (c) ALU (d) None of the above 5. Which of the following is not an addressing mode? (a) Relative address mode (b) Indexed register addressing mode (c) Indexed addressing mode (d) Base register addressing mode 6. Transfer of data under programmed I/O is between (a) CPU and peripheral (b) CPU and memory (c) ALU and peripheral (d) ALU and memory 7. The excess three codes of decimal number 7 ...

Answer the following questions (2 marks each) What is ‘Cycle Stealing’? Explain. Cycle stealing is a method of accessing computer memory (RAM) or bus without interfering with the CPU. It is similar to direct memory access (DMA) for allowing I/O controllers to read or write RAM without CPU intervention. This is similar to Burst Transfer mode, but instead of the data being transferred all at once, it is transferred one byte at a time. In this method, the transfer rate is slower but it prevents the CPU from staying idle for a long period of time. How many minterms are there if a truth table with n number of variables? Give example. There a re  2 n  min-term s of n variables since a variable in the min-term expression can be in either it's direct or its complemented form—two choices per variable. Example: In a 2 variable function how many minterms are there? 2² = 4 min-terms possible. Which of the shift operation divide a signed binary number by 2? Show that using an example. Logi...