Plumbers, pipefitters, and steamfitters may be involved in a variety of maintenance and operations work, including: (Select all replacing faulty wiring.

replacing oxygen pipes in hospitals.

repairing cooling and heating systems in high-rise buildings.

maintaining septic systems.

2015 Glynlyon, Inc.

Carbon dioxide gas expands isotherm a turbine from 1 mpa, 500 k at 200 kpa. assuming the ideal gas model and neglecting the kinetic and potential energies, determine the change in entropy, heat transfer and work for each kilogram of co2.

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.

The sum of the normal stresses does not change as the stress state rotates through an angle. a)-trune b)- false