Title: Unit 4 Quiz
Course: HAC 241 -Building Systems and Performance Spring 2015 > Section: HAC 241 -Building Systems and Performance Spring 2015

Q: What are the three requirements for combustion to take place?
- A. Air water Fuel
- B. Oxygen fuel heat
- C. Nitrogen fuel heat
- D. Gas, liquid, vapor
A: B. Oxygen fuel heat

Q: Perfect combustion occurs in:
- A. Most Furnaces
- B. All Furnaces
- C. The test laboratory
- D. Never happens
A: C. The test laboratory

Q: The dangerous by-product of incomplete combustion is:
- A. Carbon Monoxide
- B. Carbon Dioxide
- C. Nitrogen
- D. Aldehydes
A: A. Carbon Monoxide

Q: Where can single wall vent pipe be legally used?
- Going from 1st to 2nd floor
- Going from furnace room horizontally to the next room
- Only with in the same room
- None of the above
A: Only with in the same room

Q: Natural Draft furnaces operate with :
- A. A negative pressure in the flue
- B. A positive pressure in the flue
- C. Plastic vent pipe
- D. High gas operating pressures
A: B. A positive pressure in the flue

Q: The purpose of a draft hood in a Category I furnace is to:
- A. Dilute the vent gases to prevent condensation
- B. Prevent a back draft from coming into the heat exchanger
- C. Both A & B
- D. None of the above applies
A: C. Both A & B

Q: What would be the Btu rating on a furnace that has a flow rate of 85 cubic/feet per hour and a gas heat value of 1050 Btu/cubic ft.?
- A. 85,000 Btu/hr.
- B. 88,455 Btu/hr.
- C. 89,250 Btu/hr.
- D. 95,444 Btu/hr.
A: C. 89,250 Btu/hr.

Q: Which of the following has become an important safety issue when replacing a natural draft furnace with a 90 plus furnace?
- A. Orphaned water heater
- B. Gas pipe sizing
- C. Brand of furnace
- D. Electrical voltage
A: A. Orphaned water heater

Q: Proper furnace startup sequences are found in:
- A. Manufacturers literatures (PMI)
- B. National fire protection manual
- C. National electric codebook
- D. American Gas Association standards
A: A. Manufacturers literatures (PMI)

Q: The finding of 150 ppm of Carbon Monoxide in a duct supply system:
- A. Always indicates a bad heat exchanger
- B. Requires installation of a new furnace
- C. Is normal for some furnaces
- D. Requires immediate attention
A: D. Requires immediate attention

Q: The best method for confirming a crack in a heat exchanger is to:
- Visual Observation
- Salt Test
- Carbon Monoxide Test
- Carbon Dioxide Test
A: Visual Observation

Q: Some excess Oxygen in flue gasses is
- Normal
- Abnormal
- Only found in high efficiency furnances
- Depends on furnance type
A: Normal

Q: The action level in IWAP of Carbon monoxide in combustion gasses are indicated by levels greater than:
- 25 ppm
- 50 ppm
- 100 ppm
- 150 ppm
A: 100 ppm

Q: When a downdraft occurs in a gas vent system it will most likely cause:
- Roll Out
- Cracked heat exchanger
- Short cycle of blower
- Burned transformer
A: Roll Out

Q: When a plugged vent occurs in a gas vent system on a natural draft furnace it will most likely cause:
- Roll up
- Cracked heat exchanger
- Short cycle of blower
- Spillage from the draft diverter
A: Spillage from the draft diverter

Q: When starting up the combustion analyzer the best location is:
- Inside the furnace room
- Inside the house
- Inside the garage
- Outside the house
A: Outside the house

Q: The combustion test point for natural draft appliance is:
- A. 1 foot from the inducer away from turns and transitions
- B. Inside the heat exchanger before dilution air
- C. 1 foot above the draft hood
- D. Bottom of the heat exchanger
A: B. Inside the heat exchanger before dilution air

Q: The combustion test point for a category I fan assisted appliance is:
- A. 1 foot from the inducer away from turns and transitions
- Inside the heat exchanger before dilution air
- C. Test the gasses as they exit the heat exchanger
- D. Bottom of the heat exchanger
A: A. 1 foot from the inducer away from turns and transitions

Q: The combustion test point for category IV 90 plus condensing furnace is:
- A. 1 foot above the draft hood
- B. Inside the heat exchanger before dilution air
- C. Test the gasses as they exit the structure whenever possible
- D. Bottom of the heat exchanger
A: C. Test the gasses as they exit the structure whenever possible

Q: Which items are good characteristics for a vent system and enhance performance

1. Taller stack              2. Horizontal runs       3. 90 degree turns

4. Double wall vent connectors    5. Single wall vent connectors     6. 45 degree turns
- A. 1, 4, 6,
- B. All of the above
- C. 2, 3, 5
- D. 3,4,5,
A: A. 1, 4, 6,

Q: Which items are bad characteristics for a vent system and reduce performance

1. Taller stack  2. Horizontal runs  3. 90 degree turns

4. Double wall vent connectors  5. Single wall vent connectors  6. 45 degree turns
- A. 1, 4, 6,
- B. All of the above
- C. 2, 3, 5
- D. 3,4,5,6
A: C. 2, 3, 5