Select the functions that the primary control performs. You may select more than one
A) Provides flame safety shutdown
B) Controls ignition transformer
C) Provides over-temperature-limit protection
D) Provides 24 V to control external equipment
E) Starts and stops oil burner motor
A, B, E
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The cellular structure of wood consists mainly of
A) hollow, small, approximately spherical cells. B) solid, small, approximately spherical cells. C) hollow, long tubular cells. D) hollow, small, approximately ellipsoidal cells. E) either C or D.
A ____________________ with flight recorder functions may be useful during a test drive.
Fill in the blank(s) with the appropriate word(s).
Technician A says that most fuel injection systems use the PCM to control the pulsing of the fuel injectors. Technician B says that most fuel injection systems use the PCM to control the operation of the fuel pump relay. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
Which one of the following statements is not true for the PLC 5 and SLC 500 counters?
A) Counters store negative values in the in 2's complement format. B) The PRE is 16 bit integer memory register that stores the count value or set point for the number of counts to trigger an output. C) The ACC stores the count value by incrementing one count for every true to false change in the counter ladder rung. D) A reset instruction (RES) is used to return the ACC to zero.