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TSSA g3 practice exam multiple choice with precise solutions, Exams of Safety and Fire Engineering

Princeton UniversitySafety and Fire Engineering

TSSA g3 practice exam multiple choice with precise solutions

Typology: Exams

2024/2025

Available from 07/03/2025

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TSSA |! g3 |! practice |! exam |! multiple |!
choice |! with |! precise |! solutions
7. |! What |! is |! the |! ignition |! temperature |! of |! natural |! gas?
A) |! 1020 |! F
B) |! 1000F
C) |! 1300 |! F
D) |! 900 |! F |! - |! Correct |! answer |! ✔A) |! 1300°F
Explanation: |! Natural |! gas |! has |! an |! ignition |! temperature |! of |! around |! 1020°F. |! This |! is |!
the |! temperature |! at |! which |! it |! will |! ignite |! in |! the |! presence |! of |! oxygen.
8. |! What |! is |! the |! flame |! temperature |! of |! natural |! gas?
A) |! 1000F
B) |! 2025 |! F
C) |! 3500F
D) |! 3600 |! F |! - |! Correct |! answer |! ✔C) |! 3600°F
Explanation: |! When |! burned, |! natural |! gas |! can |! reach |! flame |! temperatures |! up |! to |!
approximately |! 3500°F.
11. |! What |! is |! the |! heating |! value |! of |! natural |! gas?
A) |! 2025 |! BTU
B) |! 1200 |! BTU
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TSSA |! g3 |! practice |! exam |! multiple |!

choice |! with |! precise |! solutions

  1. |! What |! is |! the |! ignition |! temperature |! of |! natural |! gas? A) |! 1020 |! F B) |! 1000F C) |! 1300 |! F D) |! 900 |! F |! - |! Correct |! answer |! ✔A) |! 1300 °F Explanation: |! Natural |! gas |! has |! an |! ignition |! temperature |! of |! around |! 1020°F. |! This |! is |! the |! temperature |! at |! which |! it |! will |! ignite |! in |! the |! presence |! of |! oxygen.
  2. |! What |! is |! the |! flame |! temperature |! of |! natural |! gas? A) |! 1000F B) |! 2025 |! F C) |! 3500F D) |! 3600 |! F |! - |! Correct |! answer |! ✔C) |! 3600 °F Explanation: |! When |! burned, |! natural |! gas |! can |! reach |! flame |! temperatures |! up |! to |! approximately |! 3500°F.
  3. |! What |! is |! the |! heating |! value |! of |! natural |! gas? A) |! 2025 |! BTU B) |! 1200 |! BTU

C) |! 3500 |! BTU

D) |! 1000 |! BTU |! - |! Correct |! answer |! ✔D) |! 1000 |! BTU Explanation: |! The |! typical |! heating |! value |! of |! natural |! gas |! is |! approximately |! 1000 |! BTUs |! per |! cubic |! foot.

  1. |! What |! is |! the |! relief |! pressure |! of |! a |! propane |! tank? A) |! 250 |! Psig B) |! 275 |! Psig C) |! 350 |! Psig D) |! 375 |! Psig |! - |! Correct |! answer |! ✔A) |! 375 |! Psig Explanation: |! Propane |! tanks |! are |! commonly |! set |! with |! a |! relief |! pressure |! around |! 250 |! psi, |! which |! prevents |! excessive |! pressure |! buildup |! within |! the |! tank.
  2. |! What |! are |! the |! products |! of |! complete |! combustion? A) |! Carbon |! dioxide, |! nitrogen, |! soot, |! heat B) |! Heat, |! water, |! hydrogen, |! oxygen C) |! Water, |! carbon |! dioxide, |! oxygen, |! dioxide D) |! Carbon |! dioxide, |! water, |! heat |! - |! Correct |! answer |! ✔D) |! Carbon |! dioxide, |! water, |! heat Explanation: |! Complete |! combustion |! of |! hydrocarbons |! like |! natural |! gas |! produces |! carbon |! dioxide, |! water, |! and |! heat |! as |! the |! main |! byproducts.
  3. |! What |! is |! the |! air |! needed |! to |! operate |! a |! gas |! appliance |! safely? A) |! Primary |! air, |! mixing |! air, |! free |! air
  1. |! If |! the |! parallel |! circuit |! had |! 23 |! amps |! with |! the |! same |! resistance, |! what |! will |! be |! the |! Voltage? A) |! 110.00 |! volts B) |! 115.25 |! volts C) |! 122.60 |! volts D) |! 125.35 |! volts |! - |! Correct |! answer |! ✔B) |! 115.
  2. |! What |! is |! current? A) |! A |! measure |! of |! the |! quantity |! of |! electron |! flow. B) |! A |! measure |! of |! the |! amount |! of |! electrical |! pressure. C) |! A |! measure |! of |! how |! much |! a |! circuit |! will |! limit |! current |! flow. D) |! A |! measure |! of |! the |! amount |! of |! power |! used |! by |! a |! circuit. |! - |! Correct |! answer |! ✔A) |! A |! measure |! of |! the |! quantity |! of |! electron |! flow Explanation: |! Electric |! current |! measures |! the |! rate |! at |! which |! electrons |! flow |! through |! a |! conductor.
  3. |! Carbon |! monoxide |! is |! a |! product |! of |! the |! incomplete |! combustion |! of: A) |! Air B) |! Oxygen C) |! Hydrocarbons D) |! Inorganic |! compounds |! - |! Correct |! answer |! ✔C) |! Hydrocarbons Explanation: |! Incomplete |! combustion |! of |! hydrocarbons |! can |! produce |! carbon |! monoxide, |! a |! harmful |! gas.
  1. |! A |! volt |! is |! a |! unit |! of |! measure |! of: A) |! The |! quantity |! of |! electrons |! flow B) |! The |! amount |! of |! electrical |! pressure C) |! How |! much |! a |! circuit |! will |! limit |! current |! flow D) |! The |! amount |! of |! power |! used |! by |! a |! circuit |! - |! Correct |! answer |! ✔B) |! The |! amount |! of |! electrical |! pressure Explanation: |! Voltage |! is |! the |! measure |! of |! electric |! potential |! difference, |! or |! electrical |! pressure, |! that |! drives |! current |! flow |! in |! a |! circuit.
  2. |! A |! carbide |! drill |! bit |! is |! use |! to |! drill |! into |! what |! material? A) |! Steel B) |! Cement C) |! Wood D) |! Gas |! pipe |! - |! Correct |! answer |! ✔B) |! Cement Explanation: |! Carbide |! drill |! bits |! are |! very |! hard |! and |! are |! often |! used |! for |! drilling |! into |! cement |! and |! masonry.
  3. |! Which |! testing |! organizations |! are |! designated |! in |! Ontario |! to |! approve |! gas |! appliances? |! Having |! btu |! input |! up |! to |! and |! over |! 400 |! cfh? A) |! CGA, |! CSA, |! AGA B) |! CSA, |! CGA, |! TSSA C) |! CGA, |! CSA, |! ULC D) |! CSA, |! CGA, |! DOT |! - |! Correct |! answer |! ✔CGA,CSA,ULC

D)10FT |! - |! Correct |! answer |! ✔A) |! 3FT When |! purging |! a |! gas |! piping |! or |! tubing |! system |! to |! the |! outdoors, |! the |! minimum |! distance |! required |! from |! a |! building |! or |! air |! intake |! is |! typically |! 3 |! feet |! (or |! 1 |! meter) |! according |! to |! many |! safety |! standards, |! including |! those |! outlined |! by |! the |! National |! Fuel |! Gas |! Code |! (NFPA |! 54) |! and |! local |! building |! codes.

  1. |! What |! is |! the |! minimum |! clearance |! needed |! to |! service |! a |! gas |! appliance? A) |! 2 |! Feet B) |! 30" C) |! 1.5 |! Feet D) |! 36" |! - |! Correct |! answer |! ✔B) |! 30 |! inches Explanation: |! Ontario |! standards |! often |! recommend |! a |! minimum |! clearance |! of |! 30 |! inches |! for |! safe |! servicing |! of |! gas |! appliances.
  2. |! How |! many |! times |! can |! you |! reset |! a |! glass |! screw |! in |! type |! fuse? A) |! Once B) |! Twice C) |! Three |! times D) |! Never |! - |! Correct |! answer |! ✔A) |! Once Explanation: |! Safety |! regulations |! generally |! allow |! glass |! screw-in |! fuses |! to |! be |! reset |! only |! once |! due |! to |! potential |! safety |! concerns.
  3. |! What |! would |! be |! the |! best |! tool |! to |! use |! to |! taper |! zinc |! coated |! seamless |! pipe? A) |! Pipe |! cutter B) |! Hand |! ratchet |! die

C) |! Taper |! pipe D) |! Pipe |! reamer |! - |! Correct |! answer |! ✔B) |! Hand |! ratchet |! die Explanation: |! A |! hand |! ratchet |! die |! is |! commonly |! used |! to |! taper |! or |! thread |! pipes |! for |! fittings.

  1. |! A |! vent |! passing |! though |! a |! roof |! line |! with |! a |! zero |! pitch |! should |! existent |! by? A) |! 2ft B) |! 6ft C) |! 4ft D) |! 3ft |! - |! Correct |! answer |! ✔D) |! 3 |! feet Explanation: |! Ontario |! code |! typically |! requires |! a |! vent |! to |! extend |! at |! least |! 3 |! feet |! above |! a |! flat |! roof.
  2. |! Can |! a |! compression |! fitting |! be |! used |! on |! copper |! tubing? A) |! Yes B) |! No C) |! Yes |! only |! if |! tubing |! is |! 1/2 |! or |! less D) |! Yes |! only |! if |! a |! shut |! off |! valve |! is |! install |! - |! Correct |! answer |! ✔A) |! Yes Explanation: |! Compression |! fittings |! can |! be |! used |! on |! copper |! tubing |! if |! installed |! according |! to |! safety |! standards.
  3. |! The |! primary |! use |! of |! a |! gas |! meter |! is? A) |! Clock |! input B) |! Leak |! test

B) |! Step |! up |! transformers C) |! Auto |! transformers D) |! Neutral |! transformers |! - |! Correct |! answer |! ✔A) |! Step-down |! transformers Explanation: |! Step-down |! transformers |! reduce |! the |! primary |! voltage |! to |! a |! lower |! secondary |! voltage.

  1. |! What |! is |! the |! millivolt |! (open |! test) |! out |! put |! of |! a |! thermocouple? A) |! 10 |! to |! 15 |! volts B) |! 20 |! to |! 25 |! volts C) |! 25 |! to |! 35 |! volts D) |! 20 |! to |! 30 |! volts |! - |! Correct |! answer |! ✔D) |! 20 |! to |! 30 |! millivolts Explanation: |! Thermocouples |! typically |! produce |! 20 |! to |! 30 |! millivolts |! under |! open |! circuit |! conditions.
  2. |! Can |! a |! G3 |! certificate |! holder, |! under |! direct |! supervision, |! install |! gas |! piping |! to |! a |! 450 |! cfh |! boiler? A) |! Yes B) |! No |! - |! Correct |! answer |! ✔A) |! Yes Explanation: |! In |! Ontario, |! a |! G3 |! certificate |! holder |! can |! perform |! certain |! tasks, |! including |! installing |! gas |! piping, |! under |! direct |! supervision
  3. |! What |! cools |! flue |! gases? A) |! Primary |! air B) |! Blower |! fan

C) |! Draft |! device D) |! Excess |! air |! - |! Correct |! answer |! ✔D) |! Excess |! air Excess |! air |! is |! the |! air |! supplied |! to |! the |! combustion |! process |! beyond |! what |! is |! needed |! for |! complete |! combustion. |! It |! helps |! to |! cool |! the |! flue |! gases |! by |! providing |! additional |! oxygen |! to |! the |! combustion |! chamber |! and |! ensuring |! that |! the |! combustion |! process |! occurs |! at |! a |! controlled |! temperature. |! This |! also |! helps |! in |! reducing |! the |! temperature |! of |! the |! flue |! gases |! as |! they |! exit |! the |! system. A |! volt |! is |! a |! unit |! of |! measure |! of: |! - |! Correct |! answer |! ✔B) |! The |! amount |! of |! electrical |! pressure Explanation: |! Voltage |! is |! the |! measure |! of |! electric |! potential |! difference, |! or |! electrical |! pressure, |! that |! drives |! current |! flow |! in |! a |! circuit. Carbon |! monoxide |! is |! a |! product |! of |! the |! incomplete |! combustion |! of: A) |! Air B) |! Oxygen C) |! Hydrocarbons D) |! Inorganic |! compounds |! - |! Correct |! answer |! ✔C) |! Hydrocarbons Explanation: |! Incomplete |! combustion |! of |! hydrocarbons |! can |! produce |! carbon |! monoxide, |! a |! harmful |! gas.