After doing a blower door test and studying the building, you determine that the natural air changes is approximately 0.4 ACHn. If the house is 21728.9 Ft3 and the building is in a climate that has 3533.6 heating degree days, what would you approximate the total heating season energy loss to be? Assume a density of air as 0.075 lb/Ft^3. Assume the specific heat capacity is 0.24 BTU/(Ib X F)

Afull journal bearing has a journal diameter of 27 mm, with a unilateral tolerance of -0.028 mm. the bushing bore has a diameter of 27.028 mm and a unilateral tolerance of 0.04 mm. the l/d ratio is 0.5. the load is 1.3 kn and the journal runs at 1200 rev/min. if the average viscosity is 50 mpa-s, find the minimum film thickness, the power loss, and the side flow for the minimum clearance assembly.

Which of the following controllers anticipates the future from the slope of errors over time? a)-proportional b)-on/off c)-integral d)-derivative.

Aquick transition of the operating speed of a shaft from its critical speed will whirl amplitude. (a) increase (b) limit (c) not affect (d) zero