Most hot water boilers heat the water up to temperatures
A) of 100°F to 150°F B) of 200°F to 250°F C) of 280°F to 300°F D) of 180°F to 200°F
D
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On magnetic contactors, which contacts are said to be normally open (N.O.)?
a. All contacts that are functioning correctly b. Those that are together when the relay is de-energized c. Those that are apart when the relay is de-energized d. All contacts that are not functioning correctly
Until spring 1943, perhaps Hitler's greatest opportunities of defeating Britain and winning the war was
A. the possibility of a successful invasion across the English Channel. B. that German U-boat would destroy Allied shipping. C. the German V-2 rockets fired into Britain that would cause their terrified civilian population to demand Prime Minister Churchill to surrender to Nazi Germany. D. that General Rommel would conquer Egypt and the Suez Canal. E. that the American-British-Soviet alliance would collapse.
Technician A says that a major source of chemical danger is from solvents containing chlorinated hydrocarbon solvents. Technician B says that solvents can be recycled so that they can be reused. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
The recovery process on an R-12 or R-134a A/C system should continue until a stable vacuum held by the system for:
A) 1 minute B) 2 minutes C) 4 minutes D) 5 minutes