Let x[n] = tri(n/4) ? ?6[n] and let 
(a) What is x[21]?
(b) What is the lowest positive frequency ? at which X ( e j? ) ? 0?
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Soil is classified into two types based on particle size. Name the types and the particle size that separates the two types.
What will be an ideal response?
Technician A says a new or rebuilt engine should have the idle maintained above 1500 rpm for at least 20 minutes to insure proper lubrication and break in. Technician B says long periods of idle are hard on the camshaft. Who is correct?
A. Technician A B. Technician B C. Both technicians D. Neither technician
Technician A says intake valves take the most punishment and should always be replaced whenever in doubt. Technician B says many exhaust valve stems have a welded on hardened tip. Who is right?
A. Technician A B. Technician B C. Both technicians D. Neither technician
What are the two categories of diagnostic trouble codes?
A. Engine and chassis. B. Binary and analog. C. Long and short. D. Active and historic.