1. consider a system where 3 page frames are allocated to a process. consider the following sequence of memory references: 3 2 1 0 3 2 4 3 2 1 0 4. assuming no pages are initially in memory, how many page faults are there assuming a fifo page replacement algorithm is used? 2. repeat problem 1 with number of frames increased to 4.3. compare the number of page faults from 1 and 2. is there belady’s anomaly? 4. repeat problems 1 and 2 using optimal page replacement algorithm.5. what is the difference between local and global page replacement?

Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.