To control capacity, scroll compressors have typically used a _____.
a. refrigerant bypass method
b. slide valve
c. multispeed motor
d. plug valve
a. refrigerant bypass method
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A) What is the actual work produced in the turbine, per kilogram of entering steam? B) How much work is required in the pump, per kilogram of entering liquid water? C) What is the overall efficiency of the heat engine? D) 1000 kJ/min of work from this heat engine is used to power a refrigerator that operates on the vapor-compression cycle. The refrigerator has a coefficient of performance of 4.2. At what rate is heat removed from the condenser in this refrigeration cycle?
A steady-state heat engine operates on the following cycle: ? A boiler is used to produce superheated steam at P=40 bar and 450 °C. ? The steam enters a turbine, which has an efficiency of 80%, and expands to P=2 bar. ? The turbine effluent enters a condenser and is converted to saturated liquid. ? The liquid enters a pump and is compressed to P=40 bar. ? The compressed liquid is fed to the evaporator.
What was the purpose of the Schengen Agreements, which were signed in 1985 and began operating in 1997?
a. to remove tariff barriers between signatory states b. to eliminate border controls between signatory states c. to provide agricultural subsidies to signatory states d. to standardize educational systems across signatory states
A driveshaft assembly that has been properly phased will have its yokes:
a. in line b. 45 degrees apart c. 90 degrees apart d. at least 3 degrees apart
A compressor speed (belt lock) sensor is used by the HVAC ECM to _________________________
A) Prevent a locked-up compressor from destroying the engine drive belt B) Determine if the compressor is running by comparing the compressor and engine speed signals C) Vary the displacement of the compressor based on compressor speed D) Both A and B