IP example test questions

Question 1

Portion of a refractory that is toxic

Answer 1

Silica

Question 2

-How to bend 7/8 copper tubing

Answer 2

With a ratchet bender

Question 3

Type of uncoated copper that can be direct buried

Answer 3

K

Question 4

Back filling under (commercial depth) parking lot, calculate volume

Answer 4

65ft length x
12” wide x 2’ 130cu ft . plus add 100% for compaction

Question 5

Proper way to make up a compression fitting

Answer 5

Nut, ferrel, push pipe to end of
fitting, plus 1-1/2 turns.

Question 6

-Joining fused pipe what do you do

Answer 6

Cut ream bevel.

Question 7

-Joining plastic pipe

Answer 7

, by electro fusion

Question 8

3/4 inch to 1/2 inch reducing coupling

Answer 8

concentric

Question 9

-8 inch branch to 4 inch field take off

Answer 9

No larger than 50% of the supply piping, no
less then 3/4” min

Question 10

-Bolt pattern for tightening a 4-bolt flange

Answer 10

Cross

Question 11

What pipe joints can be concealed?

Answer 11

Welded threaded and brazed, or flange, or
grounded union

Question 12

-2” steel pipe 115 ft how many hangers?

Answer 12

115 ÷ 10 = 11.5 round up and add 1 = 13

Question 13

-Max pressure Drop of a 20 psi system,

Answer 13

10 psi

Question 14

-How large must a gas line be before it requires purging may also relate to a decommissioning question?

Answer 14

4” or larger.

Question 15

-Minimum pressure on a gauge for a 50 lb test

Answer 15

A. 50 B. 60 C. 75 D. 100
15% in excess of test pressure = 57.5 psig

Question 16

Test dial face size

Answer 16

3” diameter

Question 17

After testing with air 6” pipe,

Answer 17

purge with nitrogen

Question 18

-Gas piping identification in a commercial building?

Answer 18

Every 20’ for steel.

Question 19

-3/4 inch to 1/2 inch reducing coupling

Answer 19

eccentric or concentric?

Question 20

GVR for a corrugated chimney liner

Answer 20

20 percent

Question 21

5 Pa Calculate vent stack with 2 natural draft and 2 fan assisted appliances.

Answer 21

. 50’ b
vent multistory, what is the single wall common vent size?

Question 22

CAT IV, how to vent

Answer 22

Determine exit, measure and assemble

Question 23

-How to attach joints of commercial drier duct

Answer 23

foil tape

Question 24

S cleat and drive cleat required for duct assembly. 12’ length in four 3’ sections,
how many drive and “S” cleats and what length?

Answer 24

12 x 18 transition to 18 x 24 on
one end, 8 of s cleats at 18”, 8 of drive cleats at 14”.

Question 25

-Combustion damper,

Answer 25

, End switch interlocked with gas valve?

Question 26

-Calculate grill size restrictions

Answer 26

10 of 1/16" width 8 of 1/16" Height ignore cross coverage.

Question 27

-Size power burner air supply, 3 appliances

Answer 27

Remember 2015 code Fan-assisted and power-fan assisted are grouped with atmospheric appliance calculations

Question 28

-3 phase motor, how to read amperage?

Answer 28

? Find motor leads with motor running, take readings on all 3.

Question 29

-Sensors ground wire on both end or just one end.

Answer 29

1 in control panel

Question 30

Know how to calculate volts amps,

Answer 30

voltage is amps x ohms Watts is volts x ohms

Question 31

-Replacing a VFD on MUA,

Answer 31

, with same settings as previously programmed

Question 32

Dual voltage motor amperage, calculate max. amperage from name plate

Answer 32

. Name plate states cont duty, SF 1.15

Question 33

-RS-485 interface is not communicating what do you check? Combo of somewhat of the following

Answer 33

, Baud rate, address.

Question 34

-minimum gauge for bonding conductor

Answer 34

#6 Copper / #4 Aluminum

Question 35

- Install air damper inside combustion air hood for thermal fluid boiler, what do you install?

Answer 35

End switch and in series with safeties?

Question 36

End switch and in series with safeties?

Answer 36

6"

Question 37

-Stationary engine over 1.5 million

Answer 37

needs additional automatic safety shutoff valve piped in series and wired in parallel.

Question 38

-50 million appliance what else do you need?

Answer 38

needs an extra SSOV

Question 39

Max pressure on a low-pressure steam boiler?

Answer 39

15 psi

Question 40

-Low fuel pressure switch setting

Answer 40

based on lowest low fire.

Question 41

High fuel pressure switch setting

Answer 41

based on highest pressure for high fire.

Question 42

-Liquid propane valve train, what additional requirement is needed for between valves?

Answer 42

Pressure relief valve

Question 43

-What 2 objects can you vent together?

Answer 43

Regs. add vent area then times 2. (no relief)

Question 44

-How to vent devices with line relief.

Answer 44

100% of largest + 50% of the sum of remaining)

Question 45

-Fill propane tank

Answer 45

Fill by volume

Question 46

What size propane tank at btu load of 500000 at -30 deg with 7 days run time?

Answer 46

Table I-9 / B-149.2

Question 47

Copper fin boiler

Answer 47

failure from reduced water flow

Question 48

Burner is warped from

Answer 48

too low of gas pressure.

Question 49

Max. pressure for LP steam boiler

Answer 49

15 psi

Question 50

Line heater gas line layout v

Answer 50

valve, strainer, vaporizer, vapour reg., valve

Question 51

-1 of 2 hot water tanks not firing due to

Answer 51

damper end switch failure

Question 52

Stationary engine brake horsepower to btu

Answer 52

4 cycle equals 10000 btu per bhp

Question 53

20% excess air have 14% CO2

Answer 53

decrease fuel pressure?

Question 54

-Calculation of NET stack temp

Answer 54

Measured flue gas temp. less combustion air (room) temp

Question 55

How much CO2 produced by a 650000 btu/h boiler

Answer 55

650 cu ft of CO2

Question 56

Amount of CO2 per cubic foot of CH4 is in the table at the back of the code

Answer 56

Table I.2 B-149.1 = 1 CF

Question 57

When used in an incinerator a draft regulator shall be of what type

Answer 57

Single acting other installations double acting

Question 58

Where an infrared heater is of the unvented type how should it be sized

Answer 58

Ventilation volume of at least 300cfm for each 100000 BTU input