Download CFESA GAS FINAL EXAM NEWEST 2025 ACTUAL EXAM COMPLETE 100 QUESTIONS AND CORRECT DETAILED and more Exams Nursing in PDF only on Docsity!
CFESA GAS FINAL EXAM NEWEST 2025
ACTUAL EXAM COMPLETE 100 QUESTIONS
AND CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+
The minimum incoming gas pressure, before a gas pressure regulator, must be _______. A) The operating pressure rating on the equipment data plate B) Determines by the utility company C) At least 1 in w.c. above the required operating pressure D) At least 5 in w.c. above the required operating pressure - CORRECT ANSWER✔✔ C To properly take a gas pressure reading on a piece of gas fired equipment all of the burners ___? A) Should be turned off B) Must be clean C) Must be set to a bypass flame height D) Must be turned full on - CORRECT ANSWER✔✔ D What is a Manometer and in what units is it calibrated?
A) A pressure gauge calibrated in psi B) A pressure testing instrument calibrated in ft. w.c. C) A pressure testing instrument calibrated in inches w.c. D) A glass tube filled with alcohol to measure gas pressure in psi - CORRECT ANSWER✔✔ C The purpose of a draft hood/draft diverter is_______? A) To prevent drafts from entering the burner compartment that comes from the power cent hoods. B) To prevent the combustion chamber from overheating, and allowing air to come down the vent pipe into the room. C) To allow the flue to control the amount of secondary air drawn in instead of the vent pipe, and to prevent air from coming back down the vent into the combustion chamber D) To allow the vent pipe to control the amount of secondary air drawn into the combustion chamber as designed by its height above the hood. - CORRECT ANSWER✔✔ C
A) The smallest flame that will keep the burners lit after the gas thermostat has reached the temperature set point B) A flame that is 3/8" tall after the thermostat shuts off C) A flame left on the burner to keep the pilot form going out D) A flame to a special part of the burner after the main burner goes off - CORRECT ANSWER✔✔ A The primary purpose of a vent on a regulator is to: A) Vent leaking gas B) Allow diaphragm movement C) Allow high pressure D) Monitor flow - CORRECT ANSWER✔✔ B A properly burning infrared ceramic burner will look______? A) Blue B) Bright reddish orange C) Dull red D) Blue with a tint of orange - CORRECT ANSWER✔✔ B Vent lines are required on regulators above 1" and must be vented:
A) A pilot flame B) An open flame within 2 feet C) A working flue or exhaust system D) The outside atmosphere, above the snow line - CORRECT ANSWER✔✔ D What is the proper flame current for an ignition module? A) Always 3 or more microamps B) Always ¼ or more microamps C) It depends on the module manufacturer D) Always 2 or more microamps - CORRECT ANSWER✔✔ C Primary air is the air______? A) That surrounds the burner B) That enters the burner though the venture C) Is the air that is vented through the exhaust system D) That must always have a pressure greater than the incoming gas pressure
- CORRECT ANSWER✔✔ B Every time a gas fired convection oven shuts off the gas flow to the burners there is a loud pop.
The normal operating pressure of LP gas is_____? A) 10-15 psi B) 3-7 psi C) 10-11 in WC" D) 3-7 in WC" - CORRECT ANSWER✔✔ C The normal operating pressure of a typical natural gas type burner is approximately: A) 15-25 psi B) 3-4 psi C) 10-11 in WC" D) 3.5-7 in WC" - CORRECT ANSWER✔✔ D Make up air is: A) The air that enters the venture of the burner B) The air that mixes with the gas at the burner ports C) The air that enters the room from the outside D) The air that is taken out through the vent - CORRECT ANSWER✔✔ C LP gas, at the appliance, is_______? A) Heavier than air
B) Light yellow C) Lighter than air D) Odorless - CORRECT ANSWER✔✔ A Ideally to burn one cubic foot of LP gas approximately______ cubic feet of air is required. A) 100 B) 24 C) 10 D) 44 - CORRECT ANSWER✔✔ B Natural gas coming out of a gas line piped into a building is: A) Heavier than air B) Light yellow C) Lighter than air D) Odorless - CORRECT ANSWER✔✔ C Ideally 100 cubic feet of natural gas is burned, approximately______ feet of air is required for proper combustion. A) 100
B) When more than normal amount of fittings are used C) Only when the gas line runs vertically D) On long gas runs - CORRECT ANSWER✔✔ A A 3/4 elbow is equivalent to how long a pipe? A) 2 feet B) 1 foot C) 3 feet D) 4 feet - CORRECT ANSWER✔✔ A Infrared burners are extremely sensitive to: A) Secondary air B) Combustible surface clearance C) Hydrogen in the gas supply D) Gas pressure. - CORRECT ANSWER✔✔ D One PSI equals approximately: A) 1" w.c. B) 1 them C) 1" mercury column D) 27.7 in w.c. - CORRECT ANSWER✔✔ D
To select the proper burner orifice size you need to know the BTU rating of the burner, the number orifices per burner, and_____. A) The gas pressure and gas type B) The pipe size, and gas type C) The gas pressure, and pipe size D) The gas type, gas pressure, and altitude of the location - CORRECT ANSWER✔✔ D A BJ thermostat will be ruined permanently if not adjusted properly. To make an adjustment you must: A) Turn the adjustment screw counter clockwise only B) Loosen the lock screw before turning the adjustment screw C) Pry out the adjustment screw before turning it D) Push in and turn the adjustment screw no more than ¼ turn in either direction - CORRECT ANSWER✔✔ D To calibrate a gas BJ or FD series thermostat you must first_______. A) Grease the valve stem
A) No load pressure B) Volume C) Pressure and volume D) Gas flow - CORRECT ANSWER✔✔ A A running pressure measurement will tell you if you have sufficient gas _______ to allow the gas fired equipment to operate properly. A) No load pressure B) Volume C) Pressure and volume D) Gas flow - CORRECT ANSWER✔✔ C An orifice opening in a natural gas orifice is _____ an orifice opening in an LP orifice of the same rating: A) Smaller than B) Same as C) Larger than D) Varies by manufacturer - CORRECT ANSWER✔✔ C
Clem is out servicing a special processing oven connected to natural gas, and using a hot surface glow coil ignitor. The customer claims that the oven does not heat up very long before it cuts out. Clem has checked the gas pressure under load, the voltage under load, the polarity of the lines, the amp draw of the glow coil, and after removing the glow coil checked its resistance which seemed OK. What did Clem do wrong? A) The voltage needed to be checked using only a digital voltmeter because of the electronics in the circuit B) The gas pressure also needed to be taken without a load C) The polarity could not have had anything to do with the problem D) The glow coil needed to be ohmed out while it was hot to show up any possible cracks in the ceramic - CORRECT ANSWER✔✔ C Joe's diner has a millivolt operated gas fired deep fryer. The pilot goes out from time to time.
B) Make sure that the tip of the sensor is being heated cherry red by the pilot flame C) Check to ensure that the gas pressure is not too low D) Make sure that the sensor is positioned away from the direct pilot flames so that it does not overheat - CORRECT ANSWER✔✔ B Cliff's seafood restaurant has been closed all day due to a broken gas main in the neighborhood leaving them without gas. The utility company just called and told them the gas is back on. Cliff turns on his fryers and they all lock out. He turns them off and then back on again and the same thing happens. He calls Tom tech and explains the situation. What should Tom do? Cliff is two hours away. A) Dispatch a technician immediately to Cliff's B) Suggest that cliff check all of his gas lines C) Ask Cliff to attempt to light a range top burner somewhere to bleed the accumulated air
from the gas lines, then to try turning the fryers on several more times to bleed the air form the fryer gas lines D) Ask Cliff to call the equipment manufacturer for suggestions - CORRECT ANSWER✔✔ C The National Fuel Gas Code ANSI 2-223.1 is the standard for venting. The final jurisdiction is: A) NFPA B) Local authority C) AGA D) BOCA - CORRECT ANSWER✔✔ B Harry is called out to service a range oven. The customer says the pilot will not stay lit, and it always smells like gas fumes when it is on. Looking through the peep hole in the kick plate he notices that the pilot light is fine, but as the burner is on for a short while the flames lift and float right off the burner. The problem is ______. A) A primary air adjustment is needed
B) Check the gas valve for shorts C) Check the sensor for shorts D) Find out why the control compartment is overheating causing the blown fuse - CORRECT ANSWER✔✔ B Terri is called out to Joe's pizza. The fire department has closed them down because people were getting sick and there were strong fumes coming from the oven. When she enters the kitchen through the back door, the door slams close behind her. The problem is ______. A) Positive air pressure caused by excessive makeup air B) Negative air pressure caused by insufficient makeup air C) The exhaust fan is not removing enough air D) There is a gas leak in the oven - CORRECT ANSWER✔✔ C Jack' Steak House has an infrared cheese melter mounted on the wall. The gas line exits the top and a gas pressure regulator is mounted right there. The regulator fails about every six weeks. The likely problem is ________.
A) A batch of bad regulators B) The high ambient heat where the regulator is mounted C) The vertical mounting position of the regulator D) Border line low incoming gas pressure - CORRECT ANSWER✔✔ B Joe is out to service a high efficiency fryer with spark ignition. The fryer keeps locking out. He connects his meter in series with the ignition sensor wire and reads 4ua of current. The problem is most likely a _____. A) Weak thermocouple B) A shorted ignitor C) A dirty flame sensor D) A faulty ignition module - CORRECT ANSWER✔✔ D Zach is called to service a one month old convection oven that will not come on. The oven control section is located right next to a charbroiler. When he opens the control panel he sees that the ignition module for the electronic ignition is melted and distorted. Zach needs to:
