Modern air brakes combine three different systems. They are the service, the parking, and the ____ brakes.
a. Emergency
b. Drum
c. Foot
a. Emergency
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What type of strainer is used when a smaller amount of solids is present?
A. “Y” type B. “T” type C. “E” type D. Basket strainer
Spot detectors containing a light source and a photosensitive device on which light rays do not normally fall operate on the _____.
a. ionization principle b. light-scattering principle c. light-obscuration principle d. smoke-rate compensation principle
Technician A says a pyrotechnic-type retractor prevents the belt from coming out of the retractor when there is a sudden pull on the belt. Technician B says an inertia lock retractor uses an explosive charge to quickly tighten the belt at the start of a crash.
a. A only
b. B only
c. both A and B
d. neither A nor B
To ensure correct direction of refrigerant flow in heat-pump room air conditioners, ____ are included in the unit.
A. filter drivers B. globe valves C. quarter-turn valves D. check valves