ip prep exam

Question 1

Which type of personal protective equipment (PPE) is essential when working with acetylene and oxygen for cutting or welding?

Answer 1

C) Welding helmet with appropriate shade filter

Essential for protecting eyes and face from bright light and sparks.

Question 2

What is a primary safety measure to ensure adequate breathable air before entering a confined space?

Answer 2

C) Testing the atmosphere with a calibrated gas detector

Ensures that the air is safe to breathe and free from harmful gases.

Question 3

According to WHMIS/GHS, what symbol indicates a product that can cause a fire or explosion?

Answer 3

D) Flame

This symbol warns of flammable substances.

Question 4

A Type ABC fire extinguisher is suitable for which classes of fire?

Answer 4

B) Ordinary combustibles, flammable liquids, and energized electrical equipment

Versatile extinguisher for various fire types.

Question 5

What does a ‘Lockout/Tagout’ procedure primarily prevent during maintenance?

Answer 5

B) Accidental energization or start-up of machinery

Ensures worker safety by controlling hazardous energy.

Question 6

Which is an example of an unsafe act in a workplace?

Answer 6

B) Operating equipment without proper training

Increases risk of accidents and injuries.

Question 7

Which section of an appliance’s installation manual is most crucial for safe installation?

Answer 7

C) Clearances, venting requirements, and piping specifications

Critical for ensuring compliance with safety standards.

Question 8

What is the main purpose of a building permit for a gas installation?

Answer 8

B) To ensure the work complies with local building codes and safety standards

Protects public safety during construction.

Question 9

When should a gas fitter utilize active listening skills?

Answer 9

B) When a customer is describing an issue with their appliance

Important for diagnosing problems accurately.

Question 10

What is the correct way to lift a heavy object to prevent back injury?

Answer 10

C) Squatting down, keeping the back straight, and lifting with legs

Reduces strain on the back.

Question 11

Which type of wrench is designed to prevent marring or damaging polished chrome fittings?

Answer 11

C) Strap wrench

Ideal for delicate surfaces.

Question 12

What blade type is generally recommended for cutting metal with a reciprocating saw?

Answer 12

B) Fine-toothed bi-metal blade

Provides cleaner cuts for metal.

Question 13

What is an important maintenance step after using a pipe threader?

Answer 13

B) Cleaning the dies and re-oiling them for rust prevention

Extends the life of the tool.

Question 14

What safety feature is commonly found on angle grinders to prevent accidental start-up?

Answer 14

B) A paddle switch or locking trigger that requires positive engagement

Enhances user safety during operation.

Question 15

What is the proper procedure for tightening pipe connections using two pipe wrenches?

Answer 15

B) One wrench holding the fitting, the other turning the pipe

Ensures a secure and tight connection.

Question 16

What is the maximum pressure for a consumer’s natural gas distribution system in residential applications?

Answer 16

B) 2 PSI

Standard pressure for safety in residential systems.

Question 17

What is the standard material for underground polyethylene (PE) gas pipe joints?

Answer 17

C) Heat fusion or mechanical fittings

Ensures leak-proof joints in underground installations.

Question 18

What is the minimum recommended burial depth for natural gas and propane lines in areas not subject to vehicular traffic?

Answer 18

B) 15- inches
24 COMMERCIAL

Protects lines from accidental damage.

Question 19

What is the maximum allowable pressure drop when pressure testing a new gas piping system?

Answer 19

A) No drop is allowed

Ensures integrity of the piping system.

Question 20

What is the purpose of a drip leg (or sediment trap) installed on a gas appliance line?

Answer 20

B) To collect sediment and moisture before it enters the appliance’s gas valve

Prevents damage to the appliance.

Question 21

What is the minimum clearance from an ignition source for a propane cylinder storage area?

Answer 21

C) 10 feet

Reduces fire risk in storage areas.

Question 22

What is a crucial consideration for the location of a residential gas meter?

Answer 22

B) It must be easily accessible for reading and servicing, and protected from damage

Ensures safety and operational efficiency.

Question 23

A domestic propane tank is filled to 80% to allow for _______.

Answer 23

[space for vapor return during filling]

Prevents overfilling and allows for thermal expansion.

Question 24

What is the primary safety device on a propane tank designed to release pressure if it exceeds a safe limit?

Answer 24

C) Pressure relief valve

Essential for preventing tank rupture.

Question 25

Propane vaporization equipment is typically required when _______.

Answer 25

[the appliance demand exceeds the natural vaporization rate of the tank] ## Footnote Ensures reliable gas supply to appliances.

Question 26

What is the purpose of a first-stage regulator in a two-stage propane system?

Answer 26

A) To reduce tank pressure to service pressure ## Footnote Prepares gas for safe use in appliances.

Question 27

If a gas regulator is undersized for an application, what symptom might be observed?

Answer 27

B) Fluctuating or insufficient outlet pressure under load ## Footnote Indicates the need for a properly sized regulator.

Question 28

What is the maximum length of a gas supply line that a regulator can be installed on without requiring additional pressure regulation?

Answer 28

A) This depends on the total BTU load, pipe diameter, and pressure drop allowance, not a fixed length ## Footnote Ensures proper gas flow and pressure.

Question 29

Which type of gas regulator has a vent tube that must be protected from physical damage, insects, and water accumulation?

Answer 29

C) External vent regulator ## Footnote Important for maintaining proper operation.

Question 30

What is the primary characteristic of a Category I (natural draft) venting system?

Answer 30

B) It operates with a negative static vent pressure and vents flue gases by buoyancy ## Footnote Essential for safe operation of gas appliances.

Question 31

What is the function of a draft hood on a Category I appliance?

Answer 31

B) To prevent downdrafts from affecting the burner and allow dilution air ## Footnote Increases safety and efficiency.

Question 32

When installing a Type B vent for a natural draft furnace, what is the minimum required clearance to combustible materials?

Answer 32

C) 3 inches ## Footnote Ensures safe operation and prevents fires.

Question 33

What is the primary safety concern with inadequate combustion air for a gas appliance?

Answer 33

B) Production of carbon monoxide (CO) ## Footnote Critical for preventing hazardous conditions.

Question 34

What is the recommended minimum distance a vent termination should be from a building opening for most appliances?

Answer 34

C) 3 feet ## Footnote Reduces the risk of flue gases entering the building.

Question 35

Which type of vent material is typically used for high-efficiency condensing furnaces?

Answer 35

C) PVC, CPVC, or polypropylene (plastic) vent pipe ## Footnote Resistant to corrosive condensate.

Question 36

What is a common cause of vent connector sags or dips?

Answer 36

B) Improper installation without adequate support or slope ## Footnote Can lead to inefficient venting.

Question 37

If a building is tightly sealed, what is a necessary measure to ensure sufficient combustion air for gas appliances?

Answer 37

B) Install a make-up air unit or provide dedicated outdoor air openings ## Footnote Ensures safe combustion process.

Question 38

What is spillage, and why is it a concern?

Answer 38

B) Flue gases escaping into the living space instead of going up the vent; indicates potential CO hazard ## Footnote Major safety risk in gas appliance operation.

Question 39

What is the purpose of a combustion air damper in some furnace installations?

Answer 39

B) To regulate the amount of fresh air entering the combustion chamber ## Footnote Ensures optimal combustion conditions.

Question 40

In a typical 24-volt AC furnace control circuit, what component steps down the line voltage to the lower control voltage?

Answer 40

C) Transformer ## Footnote Essential for safe operation of low-voltage controls.

Question 41

What is the function of a normally closed (NC) switch in an electrical control circuit?

Answer 41

B) It is closed when de-energized and opens when energized ## Footnote Commonly used in safety circuits.

Question 42

Which device uses a bimetallic strip to open or close a circuit based on temperature changes?

Answer 42

B) Limit switch ## Footnote Important for temperature regulation.

Question 43

When troubleshooting an electrical control circuit with a multimeter, what setting should be used to check for voltage?

Answer 43

C) Volts AC (V~) ## Footnote Necessary for accurate voltage readings.

Question 44

What is the purpose of a fuse or circuit breaker in an electrical circuit?

Answer 44

B) To protect the circuit from overcurrent ## Footnote Prevents damage to electrical systems.

Question 45

What technology is commonly used in modern furnaces to sense the presence of a flame at the burner?

Answer 45

C) Flame rectification (using a flame sensor/rod) ## Footnote Enhances safety by ensuring flame presence.

Question 46

How does a direct spark ignition (DSI) system ignite the main burner?

Answer 46

C) It sends a high-voltage spark directly to the main burner ## Footnote Efficient ignition method for gas appliances.

Question 47

What diagnostic tool is often integrated into electronic control boards to help identify system faults?

Answer 47

B) Blinking LED error codes ## Footnote Provides visual indications of faults.

Question 48

What is a key advantage of electronic control systems over older electromechanical systems in gas appliances?

Answer 48

B) They offer more precise control, diagnostics, and often higher efficiency ## Footnote Enhances overall performance of gas appliances.

Question 49

In a pneumatic control system, what is the typical operating pressure for the air supply?

Answer 49

B) 15-25 PSI ## Footnote Standard for effective operation of pneumatic controls.

Question 50

What is the primary function of a pneumatic thermostat?

Answer 50

B) To convert temperature changes into variable air pressure signals ## Footnote Essential for controlling heating and cooling systems.

Question 51

What type of actuator is typically used in pneumatic control systems to position valves or dampers?

Answer 51

C) Diaphragm or piston ## Footnote Commonly used for precise control in pneumatic systems.

Question 52

When calibrating a pneumatic control, what instrument is typically used to ensure accurate pressure readings?

Answer 52

B) Manometer ## Footnote Provides precise pressure measurements.

Question 53

What is a common issue with pneumatic control systems that can lead to erratic operation?

Answer 53

B) Leaks in air tubing or connections ## Footnote Can disrupt normal operation and control.

Question 54

What is the primary advantage of a sealed combustion furnace compared to a natural draft furnace?

Answer 54

B) It draws all combustion air from outdoors, eliminating potential for indoor air contamination ## Footnote Improves indoor air quality.

Question 55

What is the purpose of a temperature and pressure (T&P) relief valve on a water heater?

Answer 55

B) To release water if internal temperature or pressure exceeds safe limits ## Footnote Prevents dangerous pressure buildup.

Question 56

In a hydronic heating system, what is the function of the circulator pump?

Answer 56

B) To move hot water through the piping and heating terminals ## Footnote Essential for effective heating.

Question 57

What is the primary benefit of a sealed combustion furnace compared to a natural draft furnace?

Answer 57

B) It draws all combustion air from outdoors, eliminating potential for indoor air contamination ## Footnote Enhances safety and efficiency.

Question 58

What minimum clearance to combustibles is generally required for an approved gas unit heater?

Answer 58

C) 6 inches ## Footnote Ensures safe operation and compliance with regulations.

Question 59

What is the typical material used for the supply and return plenums in ductwork for a warm air furnace?

Answer 59

Galvanized sheet metal ## Footnote Galvanized sheet metal is commonly used due to its durability and resistance to corrosion.

Question 60

What minimum clearance to combustibles is generally required for an approved gas unit heater?

Answer 60

6 inches ## Footnote This clearance may vary by model; always consult manufacturer's instructions.

Question 61

Where should a make-up air unit's intake typically be located?

Answer 61

In a location that minimizes drawing in contaminated air or exhaust gases.

Question 62

What common safety device prevents operation of steam boilers if the water level drops too low?

Answer 62

Low water cut-off (LWCO)

Question 63

What is the purpose of 'near boiler piping' in a gas-fired boiler installation?

Answer 63

To optimize water flow, minimize heat loss, and allow for proper system control and air elimination.

Question 64

What is the purpose of a sight glass on a steam boiler?

Answer 64

To visually monitor the water level inside the boiler.

Question 65

What instrument measures the amount of carbon dioxide (CO2) or oxygen (O2) in the flue gas during combustion analysis?

Answer 65

Combustion analyzer

Question 66

Which type of burner relies solely on the momentum of the incoming gas to draw in primary air?

Answer 66

Atmospheric burner

Question 67

What is the term for adjusting the primary and secondary air for optimal combustion in a gas burner?

Answer 67

Burner adjustment or tuning

Question 68

What requirement must a decorative gas fireplace without a flue meet?

Answer 68

It must have a permanent fresh air supply.

Question 69

What is the final step in commissioning a gas appliance after installation and testing?

Answer 69

Providing the homeowner with operating instructions and safety information.

Question 70

What is the purpose of clocking a gas meter during commissioning?

Answer 70

To verify the appliance's actual gas consumption against its rated input.

Question 71

If a customer reports a 'rotten egg' smell, what should a gas fitter do first?

Answer 71

Inform the customer to open windows and evacuate, then investigate the source of the leak with a gas detector.

Question 72

What could indicate a significant drop in gas pressure at an appliance during operation?

Answer 72

A partially closed main gas valve, a partially clogged line, or an undersized gas supply system.

Question 73

What is the purpose of applying a leak detection solution to gas piping connections?

Answer 73

To visually identify gas leaks by observing bubbles.

Question 74

What is a key preventative maintenance task for gas piping systems?

Answer 74

Checking for corrosion, physical damage, proper support, and leaks.

Question 75

What is a common cause of short cycling in a furnace?

Answer 75

Oversized furnace for the heat load.

Question 76

If a hot surface igniter glows but the main burner does not light, what is a likely cause?

Answer 76

Insufficient gas supply to the main burner (e.g., closed gas valve, faulty gas valve, or low pressure).

Question 77

What should be done if a heat exchanger in a furnace is cracked or rusted through?

Answer 77

Immediately red-tag the furnace as unsafe and advise replacement.

Question 78

When troubleshooting a 'no heat' call on a gas furnace, what is the next logical component to check after the thermostat?

Answer 78

The igniter or pilot assembly.

Question 79

If flame rectification current is too low despite a clean flame sensor, what could be an issue?

Answer 79

A weak flame, poor ground connection, or a faulty control board.

Question 80

What tool measures the micro-amps produced by a flame sensor?

Answer 80

Ammeter (specifically, a multimeter capable of reading micro-amps).

Question 81

What is a likely cause if an actuator is not fully stroking in a pneumatic control system?

Answer 81

Low air supply pressure or a leak in the control line.

Question 82

What is a common cause of poor draft in a natural draft appliance vent?

Answer 82

A vent with insufficient vertical height, blockages, or negative building pressure.

Question 83

What is the most dangerous consequence of a blocked or improperly operating vent system?

Answer 83

Accumulation of carbon monoxide and other flue gases in the living space.

Question 84

During routine maintenance, what should be inspected on a power venter or induced draft fan?

Answer 84

The motor, impeller for blockages/damage, and electrical connections.

Question 85

What issues can a dirty air filter in a warm air furnace lead to?

Answer 85

Reduced airflow, increased fan motor wear, and potential overheating of the heat exchanger.

Question 86

What is the most critical measurement during a combustion analysis?

Answer 86

Flue gas temperature, oxygen (O2) or carbon dioxide (CO2) levels, and carbon monoxide (CO) levels.

Question 87

If a carbon monoxide alarm continuously activates, what is the first step a gas fitter should take?

Answer 87

Immediately shut off all gas appliances and thoroughly investigate the source of CO.

Question 88

What is the primary purpose of annual servicing of gas appliances?

Answer 88

To ensure safe and efficient operation, prolong appliance life, and prevent breakdowns.

Question 89

When troubleshooting a furnace that is running but not producing heat, what might be the issue?

Answer 89

The main burner is not igniting or staying lit.

Question 90

What potential hazard can occur if a gas line is purged into an enclosed space without proper ventilation?

Answer 90

Risk of explosion or asphyxiation.

Question 91

Why is it important to check all gas piping connections with a leak detection solution after any work?

Answer 91

To confirm all connections are leak-free and safe.

Question 92

Which tool is used to measure the gas supply pressure at the appliance manifold?

Answer 92

Manometer.

Question 93

If a gas appliance's flame appears yellow and lazy, what is the most likely cause?

Answer 93

Insufficient primary air or a partially blocked burner orifice.

Question 94

What does a gas fitter look for when visually inspecting a Category I appliance's vent connector?

Answer 94

Proper slope, secure connections, signs of corrosion, sags, and blockages.

Question 95

Why is it important to check and clean the blower wheel in a gas furnace?

Answer 95

To improve airflow, reduce motor strain, and increase efficiency.

Question 96

If a gas valve fails to open when commanded, what initial electrical test should be performed?

Answer 96

Check for proper voltage to the gas valve terminals.

Question 97

What is the primary function of a high-limit switch on a warm air furnace?

Answer 97

To prevent the furnace from overheating by interrupting the burner circuit.

Question 98

What is the term for a systematic approach to identifying the cause of a malfunction in a gas appliance?

Answer 98

Troubleshooting.

Question 99

During the annual maintenance of a propane system, why is it important to check the pressure relief valve on the tank?

Answer 99

To ensure it is not corroded, plugged, or leaking and functions correctly to prevent overpressure.