Fire Department connections to a standpipe system must be readily accessible, and properly marked. Each connection should be fitted with a device that prevents the backflow of the private water supply into the public water supply. This device is called a
A. OS & Y valve
B. check valve
C. backpressure valve
D. reverse osmosis valve
Answer: B. check valve
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Technician A says that a solenoid that is controlled by a computer is switched on or off on the ground side of the circuit. Technician B says a Chrysler-built unit, when operating in "limp-in" mode, will allow operation in all gear ranges but at reduced efficiency. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
As much as ____ can be added to the argon to increase the power in the arc without affecting the desirable qualities of the spray mode.
A. 10% oxygen B. 20% nitrogen C. 50% carbon dioxide D. 80% helium
Application spring tension in spring-applied brake systems can reach ______________ pounds of force.
A. 150,000 B. 250,000 C. 350,000 D. 450,000
(a) Compute the vertical deflection of joint D produced by the 30-kip load in Figure P8.13. For all bars, area = 2 in. 2 , and E = 9000 kips/in. 2 . (b) Assume that the truss is not loaded. If bar AE is fabricated 8/5 in. too long, how far to the right must the roller at B be displaced horizontally so that no vertical deflection occurs at joint D?
