From a tension test, the experimental data (true strain – true stress) are: True Strain True Stress (MPa) 0.01 69.0 0.03 119.5 0.06 169.0 0.1 218.2 0.15 267.2 0.2 308.6 0.25 345.0 0.3 378.0 0.35 408.2 0.4 436.4 0.45 462.9 0.5 488.0 0.8 617.0 Define the Strength coefficient (K) and strain hardening exponent (n) representing a power law true stress/strain curve (σ=KƐ n )

What precautions should you take to prevent injuries when dealing with heavy loads?

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?

Most leaks in reciprocating air compressors can be detected and minimized by: (clo4) a)-detecting leakage areas using ultrasonic acoustic detector. b)-tightening joints and connections c)-replacing faulty equipment d)-all of the given options