Before changing accessories or performing maintenance on a power tool, make sure _____
a. it is turned off
b. your hands are dry
c. to have a clean work surface
d. the power is disconnected
d
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On a transistor, control voltages are applied to the _____.
a. base b. collector c. emitter d. PN junction
What type of injector nozzles are used with today's direct injected engines?
A. poppet and pintle B. pencil C. multi-orifii and electrohydraulic D. mechanical and pneumatic
You need a device to sense boxes passing on a conveyor, a sensing distance of 5 feet, that will have all sensor units that require power on one side of conveyor. What is the best sensor to use?
A) Diffuse photoelectric B) Transmitted beam photoelectric C) Retroreflective photoelectric D) Capacitive proximity E) None of the above
R-1234yf is a preferred refrigerant over R-134a because:
A) is highly flammable B) has a high GWP C) depletes the ozone layer D) has a low GWP