In a Dry Pipe Sprinkler Systems a dry pipe valve is installed where the water supply enters the sprinkler system. Piping in the sprinkler system is filled with air under pressure, and water is prevented from entering the piping by the dry pipe valve. The air pressure in the piping keeps the valve in the closed position. When a sprinkler head opens, the valve opens because
A. the air pressure is stabilized
B. the air pressure is increased
C. the air pressure is displaced
D. the air pressure is reduced
Answer: D. the air pressure is reduced
You might also like to view...
In reference to an electronic timer, identify the type of timer that cycles its output contact open and closed for preset intervals until the control signal is removed from the input.
What will be an ideal response?
Which of these is the most important section of the repair order?
A) Customer information section B) Estimates and approvals section C) Accounting section D) Vehicle information section
What causes a fuse to blow?
A) A decrease in circuit resistance B) An increase in the current flow through the circuit C) A sudden decrease in current flow through the circuit D) Both A and B
A home requires 120,000 BTUH at peak use. The choice in furnaces is between 110,000 BTU at a cost of $4,000 and 135,000 BTU at a cost of $5,200.00. Which is the best choice?
Fill in the blank(s) with the appropriate word(s).