What advantage is there to maintaining a negative pressure on the heat exchanger?
A) The vent will not work unless the heat exchanger is at a negative pressure.
B) The negative pressure helps draw in return air from the house, increasing efficiency.
C) Safety; it ensures combustion products do not leak out into the air stream.
D) Combustion air can only be drawn into the oil burner if a negative pressure is maintained.
C
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Which of the following countries is NOT characterized by politically and ethnically
motivated violence?
a. India. b. Peru. c. Turkey. d. Colombia. e. All of these countries are characterized by politically and ethnically motivated violence.
Technician Asays the current capacity rating of a battery depends on the types of materials used in the construction of the battery. Technician B says the amount of electrical energy that a battery is capable of producing depends on the size, weight, and active area of the plates. Who is correct?
A. Technician A only B. Technician B only C. Both Technician A and B D. Neither Technician A nor B
Although a typical cellular phone requires much less, the FCC maximum power output for a cellular telephone is:
A) 6 watts B) 13 watts C) 7 watts D) 5 watts
If a split-phase motor hums and does not turn after power is applied, the most likely problem is __________.
A. a short exists B. the start winding is open C. the motor shaft is stuck D. the motor is overloaded