__ occurs when one gas flows backwards into the opposite side gas line due to a pressure Imbalance or a restriction in flow. Backfire Reverse flow Flashback
Can they adapt and handle new material? square
Which potential problem with electrical distribution and motors is caused by the loss of cooling airflow? A High temperatures B Equipment failure C High vibration D Motor not starting
Relays are electromechanical switches that lack auxiliary contacts. True False
The greatest difference between relays and contactors is the fact that contactors are equipped with large contacts that are intended to connect high-current loads to the power line. True D False
Where is the ideal place to install safety nets? 10 feet off the ground 10 feet below the working surface 30 feet under the working surface Directly under the working surface
Which maintenance tasks should be performed every trip? Visually check tire inflation and condition Check battery terminals Inspect coolant fluid and brake master cylinder
A manual reversing starter uses __ Select one: a. a mechanical interlock b. an electrical interlock c. two separate coils d. a single coil
Which diesel system supplies high-pressure diesel fuel to all of the injectors all of the time? Select one: A. Inline B. Rotary C. High pressure common rail D. Distributor
Using E85 can result in which of these? Select one: A. Reduced fuel economy B. Increased exhaust emissions C. Increased fuel economy D. Decreased exhaust emissions
18. When you get done with running a bead on your welder, you should __ A. Turn off the welder B. Remove the electrode from the holder C. Set up your materials for your next pass D. Uncontrollably waive the live holder around your work space
What does a marine pump out station do? Pumps out waste from holding tanks Cleans contaminated fuel tanks Removes water from flooded bilges Controls water flow at a dam
A vertical spill is the toughest to control due to (Select all that apply): You do not know what the material will come in contact with You cannot see where the spill is going It is not easily contained. They are predictable
3 Multiple Choice 1 point In welding detail drawings welding symbols are used to show how the pieces are to be __ cut joined aligned machined Multiple Choice 1 point The main purpose of an assembly drawing is to show how the parts are __ to be used leader line going to appear in three dimensions put together in relation to one another
Resistance welding uses electric current and __ to join metals. continuous electrodes electron beams ionized gas pressure
When surfacing with high-alloy ferrous materials, the abrasion resistance __ and the impact strength __ as the alloy content increases. decreases, decresses decreases, increases increases, decreases increases; increases
Which of the following is a step in edge preparation for ferrous metals? Aligning the edges Cutting or gouging the edge Marking the weld's location Removing nicks and burrs
Which humidifier uses a pad consisting of numerous layers of a tight metallic mesh wetted by water delivered from above? Fixed filter Piezoelectric Plate Vaporizing Question 4 Which humidifier uses a series of porous materials that wick water upward to be evaporated by passing air? Fixed filter Piezoelectric Plate Vaporizing 5
In shielded metal arc welding, the shield is made of alloy metal flux gas oxides
22. Cylinder seals were commonly made from which of the following materials? a. Gold b. Glass c. Bronze d. Limestone
