Exam Prep IFGC, MMC, Manual D

Question 1

A valve designed to activate when the fuel gas passing through it exceeds a prescribed flow is a ____.

Answer 1

excess flow valve

Question 2

When only indoor combustion air is used, a gas water heater located within a 10 foot by 10 foot room is required to have a minimum ____ cubic feet per 1,000 Btu/h.

Answer 2

50

Question 3

The approximate number of _____ threads are required to be cut for 3/4” metallic piping.

Answer 3

10

Question 4

Plastic gas piping requires a ____ tracer wire be installed with a minimum ____ AWG.

Answer 4

yellow, 18

Question 5

Primer for plastic piping used in appliance venting must be what color?

Answer 5

contrasting color

Question 6

Vented gas decorative fireplaces shall be tested in accordance with ____.

Answer 6

ANSI Z21.50

Question 7

A commercial kitchen ____ hood is mounted directly to the face of the appliance.

Answer 7

eyebrow

Question 8

An evaporator cooling coil drain must be a minimum ____ in size.

Answer 8

3/4”

Question 9

Nail stations located within a specialty shop must have a source capture system capable of exhausting a minimum ____ cfm per person.

Answer 9

50

Question 10

A valve regulated lead acid battery producing manufacturer with a 10 foot by 10 foot room used to store batteries must have a minimum ____ cfm continuous ventilation.

Answer 10

100

Question 11

A grease reservoir for a Type 1 hood shall ____.

Answer 11

Be located on the bottom of the horizontal duct

Have a depth of not less than 1”

Have a length and width not less than 12”

Question 12

Energy recovery ventilation systems shall not be used in what systems.

Answer 12

commercial kitchen exhaust systems serving a Type I or Type II hood

Question 13

Fire sprinkler piping exposed within a plenum must have a flame spread of not greater then ____.

Answer 13

5 feet

Question 14

The maximum horizontal length of a single wall connector used to vent an oil furnace shall be ____ percent of the height of the chimney or vent.

Answer 14

75

Question 15

Water heaters used for space heating and potable heating requires a mixing valve be installed to limit the maximum potable water temperature to ____ degrees F.

Answer 15

140

Question 16

When ____ pounds of a Group 1A type refrigerant is changed in a refrigeration system, the code official must be notified.

Answer 16

220

Question 17

Refrigeration piping joints located within an air duct must be tested to ____ percent of the higher of design pressure or pressure relief device.

Answer 17

150

Question 18

Hydronic piping using PEX-AL-PEX pressure pipe shall not have a solder joint occur within ____ of the pex pipe.

Answer 18

18”

Question 19

Fuel oil tank removal or abandonment must be done in accordance with ____.

Answer 19

International Fire Code

Question 20

Flammable gas or liquid heat transfer fluids for solar systems shall ____.

Answer 20

not be utilized

Question 21

What is the friction rate for a 120 foot duct system with a pressure drop of 0.4” wc?

Answer 21

.33

Question 22

What is the required furnace cfm with a heating load of 86,000 btu’s using an altitude correction factor of 2 and the supply air is 120 degrees and the room air is 70 degrees?

Answer 22

856

Question 23

What size round galvanized duct is required with a 0.1 friction rate at 700 cfm?

Answer 23

12”

Question 24

What is the equivalent length for a round pipe attached directly to a plenum in a return air system with a referenced velocity of 700 fpm at 0.08 IWC per 100 feet?

Answer 24

40 feet

Question 25

What is the equivalent length of a 30 degree elbow at 800 fpm and a 1.5 R/D ratio?

Answer 25

3.33

Question 26

How many cubic feet of space would be required to use the standard method of combustion air if you has a space with a 80,000 Btu fan assisted furnace, 40,000 Btu natural draft water heater, and a 32,000 Btu gas dryer?

Answer 26

7,600 cu ft

Question 27

What maximum total appliance btu input is allowed for an open basement measuring 30’ x 64’ with a 9’ ceiling to be able to use the standard combustion air method?

Answer 27

345,600 Btu

Question 28

A residential home has a total heating load of 62,000 Btu’s and designed with a furnace blower operating at 1240 cfm. How many cfm’s would be required for a bedroom with a heating load of 5,400 Btu’s?

Answer 28

108 cfm’s

Room CFM = (Blower CFM * Room Load) / Equipment sizing load

Question 29

A blower with an external static pressure of 0.54 IWC connected to a 60 foot duct includes a register and grille of 0.025 IWC each, a cooling coil of 0.16 IWC and a filter of 0.12 IWC. What is the total available static pressure remaining?

Answer 29

0.21 IWC

Question 30

A 75,000 Btu 95% furnace has a temp rise of 47 degrees. What is the required cfm with an altitude correction factor of 1?

Answer 30

1378

Question 31

HVAC cooling ducts exposed to the outdoors should have ____ installed to prevent condensation from forming on the exterior of the duct.

Answer 31

vapor retarder

Question 32

Mechanical equipment installed in a private garage must be installed in accordance with the ____.

Answer 32

2015 Michigan Residential Code

Question 33

The air temperature in non-metallic ducts shall not exceed ____ degrees F.

Answer 33

250

Question 34

Commercial kitchen grease ducts horizontal clean out must be a minimum ____ size.

Answer 34

12” x 12”

Question 35

In a commercial duct system, how many duct classifications exist?

Answer 35

14
7 positive
7 negative