Dawn is preparing a home office to perform subcontract projects for midsized architect firms. She plans to use $14,000 of her own funds, which currently generate a return of 4% per year. The remainder of financing will be provided by a $11,000 bank loan carrying a
9% per year interest rate. She hopes to realize a return of 3% above the average cost of capital to establish her office, and she realizes
that the factors of inflation and risk should also be considered. Her decision is to add another 1.5% per year to compensate for these
elements. What is the MARR she should use when evaluating projects?
The MARR she should use is
%.

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?

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

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.