Which of the following can be used to maintain the head pressure of a system with an air-cooled condenser?
A. fan cycling
B. condenser flooding valve
C. dampers or louvers
D. all of the above
Answer: D
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Series wound electric motors ________
A) Produce maximum power at high RPM B) Use a shunt coil C) Produce maximum power at 0 RPM D) Produce electrical power
Technician A says the Haldex clutch uses hydraulic pressure to regulate torque between the front and rear axles. Technician B says the Quaife differential uses clutches to regulate torque between front and rear axles. Who is correct?
A. A only B. B only C. both A and B D. neither A nor B
In some applications of truck refrigeration, a liquid refrigerant is sprayed directly into the truck box to maintain low temperatures. The liquid refrigerant used is ____.
A. O2 B. N C. CO2 D. NH3
Only forestry occupations have a higher death rate than agricultural occupations.
Answer the following statement true (T) or false (F)