Alternating bit and go-back-n network emulator: version 1.1 j. f.kurose

this code should be used for pa2, unidirectional or bidirectional

data transfer protocols (from a to b. bidirectional transfer of data

is for extra credit and is not required). network properties:

- one way network delay averages five time units (longer if there

are other messages in the channel for gbn), but can be larger

- packets can be corrupted (either the header or the data portion)

or lost, according to user-defined probabilities

- packets will be delivered in the order in which they were sent

(although some can be lost).

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?

Condition monitoring is a major component of. (clo4) a)- predictive maintenance. b)-preventive maintenance c)-proactive maintenance d)-reactive maintenance.

An electric kettle is made out of stainless steel, weighs two pounds (when empty) and is equipped with a heating element that consumes 2 kw of electricity. assuming that the water and the kettle are at the same uniform temperature at any moment of time, calculate the shortest possible time to bring 2 quarts of water from room temperature to the onset of boiling