What is the difference between the way a self-threading and a self-drilling sheet-metal screw is used?
A) Self-drilling screws must have a pilot hole.
B) Self-drilling screws can only be installed with a counterclockwise rotation.
C) Self-threading screws must have a pilot hole.
D) Self-threading screws can only be installed with a counterclockwise rotation.
C
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Which of the following will not increase the efficiency of water use by plants in an irrigation system?
A) the use of herbicides to control weeds B) the use of drip irrigation for fruit trees C) the use of crop residues to reduce evaporation D) the use of concrete-lined delivery ditches E) the use of flood irrigation for forage crops
The importance of horizontal spindle surface grinding is increasing for what primary reason?
A) More machinists are capable of doing precision surface grinding B) Horizontal grinding machines are getting less expensive C) Tolerances of 50 millionths of an inch are common place today D) All of the above
Environmental tobacco smoke (ETS) is more commonly known as _________________________.
Fill in the blank(s) with the appropriate word(s).
Technician A says that the first generation of diesel common rail (CR) systems was introduced on small bore diesel engines. Technician B says that CR fuel systems are unable to produce high enough peak pressures to fuel current medium and large bore diesel engines. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B