32 week 3 review

The cad cell relay is a safety device that uses which of the following to prove ignition?

• Heat in the combustion chamber.

• Heat in the blast tube.

• Heat in the flue.

• Light in the combustion chamber.

Tags

NGSS.MS-PS1-4

The stack switch or stack relay ____.

• All of the above.

• shuts down the burner if it does not sense heat in the stack

• cuts off the ignition after the flame has been established

• starts the fan motor when the thermostat calls for heat

Perfect combustion produces which of the following?

• Heat, carbon dioxide, and water vapor

• Oxygen, carbon dioxide, and heat

• Oxygen, water vapor, and heat

• Heat, oxygen, and carbon dioxide

Incomplete combustion produces which of the following toxic substances?

• Soot

• Carbon Monoxide

• Water Vapor

• Carbon Dioxide

Which of the following statements is true regarding the cad cell?

• The cad cell is a component part of a stack relay primary control.

• The resistance of a cad cell decreases when it senses light.

• The resistance of a cad cell increases when it senses light.

• The resistance of a cad cell decreases when no light is sensed.

A primary control with an intermittent ignition control strategy, such as the one shown in Figure 32.84,

• energizes the burner motor, the oil valve, and ignition during a call for heat.

• energizes the ignition only at the beginning of a heating cycle.

• does not allow for a pre-purge or post-purge cycle.

• energizes the oil valve a few seconds after the burner motor is energized.

Tags

NGSS.MS-PS3-3

A primary control with an interrupted ignition control strategy, such as the one shown in Figure 32.86,

• must energize the burner motor, the oil valve, and ignition at the same time.

• can energize the ignition for a short time at the beginning of a heating cycle.

• does not allow for a pre-purge or post-purge cycle.

• does not allow the oil burner motor operate unless the oil burner is firing.

The voltage provided by a solid-state igniter typically ranges from

• 5000 V to 8000 V.

• 7000 V to 11,000 V.

• 10,000 V to 15,000 V.

• 14,000 V to 20,000 V.

The primary control monitors/controls the operation of all of the following except

• the safe starting and stopping of the oil burner.

• the ignition of the oil-air mixture.

• the speed at which the oil burner motor rotates.

• the opening and closing of the oil valve.

Tags

NGSS.MS-PS3-3

Which of the following statements is true regarding the FAN/LIMIT switch shown in Figure 32.77?​

• d. The limit switch closes on a rise in temperature and the fan switch opens on a rise in temperature.

• a. Both the fan and limit switches open on a rise in temperature.

• c. The fan switch closes on a rise in temperature and the limit switch opens on a rise in temperature.