What is the purpose of bypass piping on a hot water gas fired boiler?
A) ensure that the return water temperature does not drop too low
B) to modulate the capacity of the heating system
C) to allow the boiler to fire continuously, even with no heating load
D) to relieve the extra pressure created by the circulating pump
A
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Noise from a worn U-joint can include squeaking, clunking, knocking, or grinding sounds.
Answer the following statement true (T) or false (F)
What causes the pressure to increase on one side of the hydraulic system during a turn?
A) The speed of the pump B) Action of the rotary valve C) Temperature of the fluid D) The speed of the vehicle
Nickel metal hydride (NiMH) batteries can be damaged if exposed to temperatures higher than about ________
A) 225 deg F B) 150 deg F C) 175 deg F D) 200 deg F
When the term all-wheel drive (AWD) is applied to four axle truck with two steering axles, which axles receive drive torque?
A. all four B. one steering, tandem-driven rear C. one steering, one rear D. two steering, one rear