15. For the irreversible elementary reaction in parallel is, the rate of disappearance of reactant A is given by
(A)(k₁-k₂)C_A
(B) (k₁+k₂)C_A
(C)0.5(k₁+k₂)C_A
(D) kIC_A

11. For the liquid phase parallel reactions:The desired product is R. The higher selectivity of R will be achieved, if. The reaction is conducted at (A) The low temperature in an ideal continuous stirred tank reactor (CSTR) (B) The high temperature in an ideal continuous stirred tank reactor (CSTR) (C) The low temperature in an ideal plug flow reactor (PFR) (D) The high temperature in an ideal plug flow reactor (PFR) mol

12. The desired liquid-phase reaction , is accompanied by the side reaction ,from dt the standpoint of favourable product distribution, the most desirable contacting scheme is (A) An ideal plug flow reactor (PFR) with the mainstream of '"D" and "E" (B) An ideal plug flow reactor (PFR) with the mainstream of "D" and side stream of "E" (C) An ideal plug flow reactor (PFR) with the mainstream of "E" and side stream of "D" (D) An ideal mixed flow reactor (MFR) with the mainstream of "D" and "E"

13. For the uni-molecular type elementary reactions, the fractional yield of B in MFR for the given conversion of A (A) remains constant with increase in k2/k1 (B) increases with the increase in k2/k1 (C) decreases with the increase in k2/k1 (D) increase linearly with increase in k2/k1

14. Consider the liquid phase reactions shown in the schematic below carried out in a flow reactor at steady state.Keeping the reaction system isothermal, the yield of the desired product can be maximized by maintaining Keeping the reaction system isothermal, the yield of the desired product can be maximized by maintaining (A) Low concentration of A and high concentration of B (B) The high concentration of A and high concentration of B (C) Low concentration of B and low concentration of B (D) The high concentration of A and low concentration of B

複選題1. Given (1) an instruction has 32 bits, and (2) a cache memory with 64 blocks, 16 bytes/block, and 4-way set associative. Which of the following statements are true? (A)Byte address 1200 maps to the set number 11 (B) The index field requires 4 bits (C) The offset field is 12 bits (D)The tag field is 16 bits (E) None of the above

複選題2. Which of the following statements are true for memory hierarchy? (A)Spatial locality refers to the situation that an item tends to be referenced soon once it is referenced. (B) When increasing the size of a cache block, the miss penalty decreases (C)Increasing cache associativity decreases the utilization of a cache (D)A valid bit indicates whether the data in a block is valid or not (E) A cache block is the basic unit for the cache storage

複選題3. Which of the following statements are true regarding the pipeline hazards of a 5-stage MIPS CPU? (A)The data forwarding technique passes data to the previous instructions that need the data (B) The structural hazard happens when a required resource is busy (C) Rearranging the instructions may solve some of the data hazards (D)If we put the register comparator and the target address calculator at the ID stage, then 2 stalls are needed for a branch hazard (E) If we put the register comparator and the target address calculator at the ID stage, and a comparison register is a destination of immediately preceding load instruction, then 1 stall is needed

複選題4. Given the execution time of the 5 stages of a CPU: IF 200 ps, ID 100 ps, EXE 200 ps, MEM 200 ps, WB 100 ps, which of the following statements are true? (A) The ideal cycle time of a single cycle CPU is 800 ps (B) The ideal execution time of "sw" for a single cycle CPU is 800 ps (C)The ideal cycle time of a multiple cycle CPU is 200 ps (D)The ideal execution time of "Iw" for a multiple cycle CPU is 800 ps (E) None of the above

複選題5. Given a 16-bit computer with the I-type instruction in the following format, which of the following statements are true? (A)The computer supports at most 16 operations (B) The computer has 8 registers (C) The range of the number in the immediate field (in 2's complement) is from -25 to 25-1 (D)Each register is 8-bits long (E) None of the above

複選題6. Which of the following statements are true for dynamic branch prediction? (A)Branch history table or branch prediction buffer can be implemented as a memory indexed by the lower bits of the program counter address. (B) Branch prediction buffer must have tag and address check. (C)A 2-bit dynamic branch predictor must miss twice before the prediction is changed. (D)Mis-prediction can be caused by getting the branch history of wrong branch when indexing the branch history table. (E) Correlating branch predictors assume that the behaviour of a branch would not be affected by the behaviours of other branches.