The maximum safe level to pressurize a system with nitrogen when checking for leaks is:
A) 500 psig.
B) The low-side system test pressure.
C) A pressure equal to the saturation pressure at 150°F for the system refrigerant.
D) The high-side system test pressure.
B
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When troubleshooting a residential air conditioning system, the technician notices the condenser fan motor operating, but the compressor is not. What is the most likely cause?
A. high-voltage circuit breaker for condensing unit is tripped B. high-pressure switch is open C. defective compressor D. defective contactor
A written record of fire drills shall be readily available for Fire Department inspection, and shall be kept on the premises for a
A. two year period B. three year period C. one year period D. five year period
A spring is a mechanical device often in the form of a ____ coil that yields by expansion or contraction due to ____ applied.
A. helical; pressure B. hexagonal; force C. helical; stress D. helical; force E. a, c, and d
If a trench is 8 feet (2.4 meters) deep, the front outrigger of a wheeled crane should be placed at least _____.
a. 8 feet (2.4 meters) away from the edge b. 12 feet (3.6 meters) away from the edge c. 20 feet (6.1 meters) away from the edge d. 24 feet (7.3 meters) away from the edge