When is the gas valve energized on an induced-draft furnace that uses hot surface ignition?
A) At the same time the induced draft blower is energized
B) After the igniter has been energized
C) On the initial call for heat
D) After the draft switch closes to prove the draft
B
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This symbol to used to show an open contact. What is the symbol for a closed contact?
a. C b. © c. X d. Ø
Which tailpipe emission does a DPF attempt to minimize?
A. PM B. VOCs C. CO D. NOx
When it came to welfare programs, Richard Nixon
A. sought to exclude African Americans. B. tried to repeal only food stamps and Medicaid. C. did little to reduce the poverty rate. D. did his best to do away with Lyndon Johnson's Great Society programs. E. supported significant expansion in many areas.
The ____ is usually located where the coolant leaves the top of the block, just below the upper radiator hose.
A. thermostat B. exhaust port C. vacuum valve D. fan clutch