What are differences between a spark-ignition (gasoline) engine and a compression-ignition (diesel) engine?
What will be an ideal response?
In the spark-ignition engine, fuel and air are mixed prior to entering the
cylinder and a spark plug ignites the mixture. In a compression-ignition
engine, air is compressed to a high temperature and pressure; fuel is
injected into the cylinder and because of the high temperature starts to
burn rapidly.
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Technician A says that any vehicle producing excessive NOx emission can be identified by performing an opacity test on its exhaust smoke. Technician B says that PM in the exhaust gas is always identified in opacity testing. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B
A welder work 5 days and makes the following each day:
Monday $139.00 Tuesday $101.00 Wednesday $182.00 Thursday $102.00 Friday $121.00 What is the welder’s daily average?
____________________ is the resistance to motion created when two surfaces move against each other, or when a moving surface moves against a stationary one.
Fill in the blank(s) with the appropriate word(s).
TechnicianA says equipment and tools should be used for only the purpose for which they were designed. TechnicianB says equipment and tools can be modified by the technician so equipment and tools can be used for other functions as well. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B