What are the advantages of using pneumatic controls?
What will be an ideal response?
They are simple to install and understand. A person with a mechanical background can soon adapt to them.
They are safe and explosion-proof where combustible materials may be used.
They are easily adapted to provide either on-off or modulating control functions.
They are very versatile, and many control sequences may be accomplished with them.
They are very reliable.
Installation cost may be lower than the cost of running long electrical lines and conduit.
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All of the following are true statements about ribbed stretchy belts EXCEPT:
A. A multi-ribbed belt may have an automatic belt tensioner B. Stretchy belt is used to drive one components such as an air conditioning compressor C. A special tool is required to guide the new belt onto the pulley D. A stretchy belt appears similar to a multi-ribbed belt
A list of all door frame components would include the _____.
a. top casing and side casing b. top casing, side casing, door stop strip, and head jamb c. top casing, side casing, door stop strip, and side jamb d. top casing, side casing, door stop strip, head jamb, and side jamb
All of the following precautions are suggestions for drivers when they come to a highway-rail intersection EXCEPT:
A. If there is a line of traffic at a traffic light and you may have to stop on a railroad track, a good rule of thumb is to never stop on a railroad track, even if you do not see a train coming. B. To better hear the train, roll down the window and turn off the stereo, CB, and fans. C. If a train is stopped nearby, do not cross the tracks for any reason. D. Stop no closer than 50 feet (15.2 m) from the nearest rail.
A signal 
has a CTFS harmonic function 
. What is the numerical value of 
? (It is not necessary to find a general expression for to answer this question.)
What will be an ideal response?