Match the component with its description.
A. meters flow of fuel oil into the chamber
B. generates approximately 10,000 volts needed for spark
C. devices that will shut burner down in case the burner doesn't fire
D. creates turbulence in the air-oil mixture to increase efficiency
E. changes its resistance depending on the amount of light it senses
F. insulated with ceramic to prevent electrical ground
A. nozzle
B. ignition transformer
C. stack switch
D. flame retention ring
E. CAD cell
F. electrodes
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Las uniones y las grietas del bloque instalado en un tanque caliente no deben ser de más de:
a. 1/8 de pulgada (0,32 cm). b. 1/4 de pulgada (0,63 cm). c. 3/8 de pulgada (0,95 cm). d. 1/2 pulgada (1,27 cm).
Architectural symbols can convey the number of electrical ____ necessary for proper operation of a device or piece of equipment.
A. switches B. gates C. connectors D. conductors
How is a temperature-pressure relief valve on a hot-water boiler tested?
A) Pressurize the boiler with nitrogen until the pressure relief valve opens. B) Pressure relief valves are optional, so testing is not required. C) Jump the high limit and operate the burners until the pressure relief valve opens. D) Pull lever and look for water at outlet of discharge pipe.
__________ refers to braking by dissipating energy from the motor by a resistor.
A. Regeneration B. Dynamic braking