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Sprinkler system MCQ: 44 questions on design, heads, pumps and upkeep, every answer cited to IS 15105:2021

This bank holds 44 multiple-choice questions on fixed automatic sprinkler systems, in four sets of 11: hazard classes and design density, head spacing and location, pipework pumps and water supply, and alarms testing and maintenance. Every answer names the clause of IS 15105:2021 that settles it.

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By Flamekite Editorial Desk · facts checked against official sources on 2026-10-26

Part 1

Study notes

Overview

This bank holds 44 multiple-choice questions on fixed automatic sprinkler systems, in four sets of 11: hazard classes and design density, head spacing and location, pipework pumps and water supply, and alarms testing and maintenance. Every answer names the clause of IS 15105:2021 that settles it.

The code is the first revision of the Bureau of Indian Standards code of practice for the design, installation and maintenance of fixed automatic sprinkler systems, published in July 2021. Figures such as 126 m2 for a light hazard compartment, 1.8 m minimum head spacing and a 45 m limit on height difference per installation come straight from it.

Water spray and deluge systems are outside the code (cl. 1.4), and the Table 31 maintenance schedule disagrees with the text of clause 15.6.4 on flushing, so no question asks the flushing interval. Questions are Flamekite's own, not past papers.

Every question and answer rests on a clause of IS 15105:2021, read on 26 October 2026, and on no other source. The questions are Flamekite's own, not past papers, and no exam notice read for this site lists sprinklers as a syllabus topic. Building-specific water and pumping rules come from SP 7 (Part 4), which this bank does not test.

Sprinkler system MCQ bank at a glance: 8 facts

The bank is built from IS 15105:2021, read on 26 October 2026.
WhatThe ruleSource
StandardIS 15105:2021, first revision, July 2021, CED 22 Fire Fighting Sectional CommitteeBIS, IS 15105:2021
CoversDesign, installation and maintenance of fixed automatic sprinkler fire extinguishing systemsBIS, IS 15105:2021
Not coveredWater spray and deluge systems (IS 15325, IS 15519), ships, aircraft, vehicles and mines (cl. 1.4, 1.5)BIS, IS 15105:2021
Hazard classesLight, ordinary (moderate), high and storage (cl. 5.1)BIS, IS 15105:2021
Questions44 in 4 sets, answer positions mixedBIS, IS 15105:2021
Question typeSingle best answer from 4 options, with the clause in the explanationBIS, IS 15105:2021
Not covered by this bankExtinguishers, hydrants and alarms: see the other question pages and the IS code pagesBIS, IS 15105:2021
Where to read the codeA free BIS copy after registration; the explanations paraphrase and cite clause numbersBIS, IS 15105:2021

Sprinkler system MCQ numbers to memorise from IS 15105:2021

Eight figures that decide most sprinkler questions, each with its clause in the answer sets above.

Sprinkler system MCQ: how Flamekite's exam pages treat the topic

The two exam notices read for this site do not print a sprinkler syllabus, so this bank is practice for the job, not a paper prediction.

Telangana Fire Fighter, 2026
The two written tests name only general topics such as English, arithmetic and reasoning, plus 9 syllabus items in all. Sprinklers are not named. TSLPRB notice 189/2026
AAI Junior Assistant (Fire Services)
The notices print no topic-wise syllabus, number of questions or marks per subject, so sprinklers cannot be claimed as tested. Flamekite's topic map lists them as a study area only. AAI NR 01/2025
How to use the bank
Treat it as job knowledge for a fire officer or a candidate preparing for a fire service interview, and check a notice's own syllabus before you plan. BIS, IS 15105:2021

Sprinkler system MCQ: 6 common traps and the clause that settles each

Six mix-ups that cost marks, each answered by one clause of IS 15105:2021.

  • You may have read

    Every hazard class gets the same 4.5 m head spacing.

    Myth

    What the sources say

    Light and ordinary hazard allow 4.5 m, but high hazard is limited to 3.75 m (cl. 9.17.2). BIS, IS 15105:2021

  • You may have read

    A smaller design area allows a lower density.

    Myth

    What the sources say

    Density is never reduced for an area below the design area: 84 m2 light, 360 m2 ordinary, 260 m2 high (cl. 8.1). BIS, IS 15105:2021

  • You may have read

    Goods can be stored anywhere in an ordinary hazard area.

    Myth

    What the sources say

    Only in blocks of 50 m2 or less with 2.4 m clear and within the Table 6 heights; otherwise the whole occupancy is high hazard (cl. 8.1.2). BIS, IS 15105:2021

  • You may have read

    A bigger pump than needed is optional.

    Myth

    What the sources say

    Pump capacity must exceed the calculated flow and pressure by at least 20 percent (cl. 12.1(e)). BIS, IS 15105:2021

  • You may have read

    Any hazard may use a pre-calculated pipe schedule.

    Myth

    What the sources say

    Only light and ordinary occupancies up to 5,000 m2 and not gridded or looped; all other cases are fully calculated (cl. 10.3). BIS, IS 15105:2021

  • You may have read

    Deluge and water spray systems are part of this code.

    Myth

    What the sources say

    They are excluded and covered in IS 15325 and IS 15519 (cl. 1.4). BIS, IS 15105:2021

Sprinkler system MCQ: 10-point revision checklist

Ten items to tick before you attempt the 44 questions again.

  • Classes: light, ordinary, high, storage; light compartments at most 126 m2 with 30 min separation. BIS, IS 15105:2021
  • Design: 2.25 lpm/m2 over 84 m2, 5 over 360 m2, 12.2 over 260 m2; storage 25 to 50 lpm/m2. BIS, IS 15105:2021
  • Coverage per head: 21, 12 and 9 m2; spacing 4.5, 4.5 and 3.75 m; never closer than 1.8 m. BIS, IS 15105:2021
  • Walls: half the spacing, 1.5 m cap for combustible or open sides, 100 mm minimum. BIS, IS 15105:2021
  • Deflector 75 mm below the ceiling at least; 300 mm (combustible) or 450 mm (non-combustible) at most. BIS, IS 15105:2021
  • Heads: rating 141 C over high piled storage; red bulb is 68 C; guards on exposed heads. BIS, IS 15105:2021
  • Pipes: 5,000 m2 pre-calculated limit, 7 bar ceiling, 50 mm direct connection in light hazard, 32 mm arm pipes. BIS, IS 15105:2021
  • Pumps: direct coupled, no belts, 20 percent margin, engine standby for electric pumps. BIS, IS 15105:2021
  • Water: light 30 min or 60 m3, ordinary 60 min or 150 m3, high 120 min; 45 m per installation. BIS, IS 15105:2021
  • Care: pumps 5 min daily, weekly gauge check, gong every 3 months, discharge test every 6 months, spares kept at or below 38 C. BIS, IS 15105:2021

Sprinkler system MCQ: where to read the rule behind each answer

Four Flamekite pages teach the topics in these 44 questions, from the same standard and its neighbours.

Sprinkler system MCQ: what is not confirmed

Three points a reader may expect are not settled in the 2021 text read, so no question tests them.

  • If How often to flush the pipework

    Clause 15.6.4(g) says flush the entire system at least yearly, while Table 31 gives 2 years for main piping and 6 months for the sprinkler network. The code disagrees with itself, so no question asks it. BIS, IS 15105:2021

  • If Whether the code has been amended since July 2021

    No amendment appears in the text read, but the BIS amendment record was not checked. Not confirmed. BIS, IS 15105:2021

  • If Water and pumping for a named building type

    Clause 1.6 sends building groups to Table 7 of SP 7 (Part 4), which this bank did not read. Clauses 12 and 13 apply to the occupancies not in that table. BIS, IS 15105:2021

Part 2

Free practice and mock test

16 free questions from the 44-question bank. Practise one at a time with the answer and its clause shown as you go, or sit a timed mock and see your score, accuracy and weak topics at the end. Your progress stays in this browser only.

Question 1 of 16Hazard classes and design density

A light hazard occupancy has one compartment larger than what area before the system must be designed as ordinary hazard?

Pick an option to see the answer and the clause behind it.

Part 3

16 free questions with cited answers

The free sample on one page, for revision: open “Show answer” under any question.

Sprinkler MCQ: hazard classes and design density (11 questions)

Eleven questions on hazard classification, design area and density, and stored goods, from clauses 5 and 8 of IS 15105:2021. Pick an answer, then open "Show answer".

  1. Q1 A light hazard occupancy has one compartment larger than what area before the system must be designed as ordinary hazard?

    1. 84 m2
    2. 126 m2
    3. 260 m2
    4. 360 m2
    Show answer

    B. 126 m2. IS 15105:2021 cl. 5.2.2 allows no light hazard compartment over 126 m2, and the compartments must be separated by 30 min walls and doors; otherwise the design follows ordinary hazard. BIS, IS 15105:2021

  2. Q2 Over what greatest area of operation is the light hazard design density assumed to apply?

    1. 84 m2
    2. 126 m2
    3. 260 m2
    4. 360 m2
    Show answer

    A. 84 m2. IS 15105:2021 cl. 8.1.1 gives 2.25 lpm/m2 over a maximum of 84 m2. BIS, IS 15105:2021

  3. Q3 What area of operation does the code assume for an ordinary hazard design?

    1. 84 m2
    2. 126 m2
    3. 260 m2
    4. 360 m2
    Show answer

    D. 360 m2. IS 15105:2021 cl. 8.1.2 sets 5 lpm/m2 over a maximum area of 360 m2. BIS, IS 15105:2021

  4. Q4 Which design density applies to a high hazard occupancy?

    1. 5 lpm/m2
    2. 8.1 lpm/m2
    3. 12.2 lpm/m2
    4. 25 lpm/m2
    Show answer

    C. 12.2 lpm/m2. IS 15105:2021 cl. 8.1.3 gives 12.2 lpm/m2 over a maximum of 260 m2. BIS, IS 15105:2021

Sprinkler MCQ: head spacing and location (11 questions)

Eleven questions on coverage, distances, deflector position, temperature ratings and bulb colours, from clauses 7 and 9.

  1. Q1 What is the greatest area one standard pendent or upright head may protect in a high hazard occupancy?

    1. 9 m2
    2. 12 m2
    3. 21 m2
    4. 36 m2
    Show answer

    A. 9 m2. IS 15105:2021 cl. 9.17.1(c) gives 9 m2 for high hazard, against 21 m2 light and 12 m2 ordinary. BIS, IS 15105:2021

  2. Q2 What is the greatest distance between standard heads in a high hazard occupancy?

    1. 3.00 m
    2. 3.75 m
    3. 4.50 m
    4. 6.00 m
    Show answer

    B. 3.75 m. IS 15105:2021 cl. 9.17.2(c) gives 3.75 m; light and ordinary hazard allow 4.5 m. BIS, IS 15105:2021

  3. Q3 What is the closest that two standard heads may be placed, for all hazards?

    1. 1.0 m
    2. 1.8 m
    3. 2.4 m
    4. 3.0 m
    Show answer

    B. 1.8 m. IS 15105:2021 cl. 9.17.3 sets 1.8 m without exception, though intermediate heads in racks may go closer. BIS, IS 15105:2021

  4. Q4 How far may a head sit from a boundary wall, measured along the range pipe, in terms of head spacing?

    1. The full spacing
    2. Half the spacing
    3. A quarter of the spacing
    4. One and a half times the spacing
    Show answer

    B. Half the spacing. IS 15105:2021 cl. 9.17.4(a) (and 9.7) allows 0.5 times the spacing along the range pipe, and 0.5 times the range pipe spacing across it. BIS, IS 15105:2021

Sprinkler MCQ: pipework, pumps and water (11 questions)

Eleven questions on pipe sizing methods, pipe limits, pumpsets and reservoir capacity, from clauses 6, 10, 12 and 13.

  1. Q1 A pre-calculated system (not gridded or looped) is allowed only for light and ordinary occupancies up to what aggregate floor area?

    1. 1,000 m2
    2. 2,500 m2
    3. 5,000 m2
    4. 10,000 m2
    Show answer

    C. 5,000 m2. IS 15105:2021 cl. 10.3.1(a) limits pre-calculated sizing to light and ordinary occupancies with an aggregate floor plate of 5,000 m2 or less. BIS, IS 15105:2021

  2. Q2 Which installation must always have its pipes sized by full calculation?

    1. A light hazard hotel of 4,000 m2
    2. An ordinary hazard hall of 3,000 m2
    3. A high hazard occupancy
    4. A light hazard office floor of 800 m2
    Show answer

    C. A high hazard occupancy. IS 15105:2021 cl. 10.3.2 requires full calculation for high hazard, storage, any system with special heads such as ESFR, and light or ordinary areas above 5,000 m2. BIS, IS 15105:2021

  3. Q3 What is the greatest pressure allowed anywhere in a sprinkler installation?

    1. 5 bar
    2. 7 bar
    3. 10 bar
    4. 12 bar
    Show answer

    B. 7 bar. IS 15105:2021 cl. 10.3.3 says the maximum pressure in the installation shall not exceed 7 bar. BIS, IS 15105:2021

  4. Q4 In light hazard only, a head may connect directly to a pipe of up to what nominal bore?

    1. 25 mm
    2. 32 mm
    3. 50 mm
    4. 65 mm
    Show answer

    C. 50 mm. IS 15105:2021 cl. 10.1(b) forbids direct connection to distribution pipes except in light hazard on pipes not over 50 mm. BIS, IS 15105:2021

Sprinkler MCQ: alarms and maintenance (11 questions)

Eleven questions on alarm gongs, acceptance tests, routine checks and spare heads, from clauses 7.10, 11.10, 14 and 15.6.

  1. Q1 Within what time of water flowing must a water motor alarm give its signal?

    1. 5 to 10 s
    2. 45 to 60 s
    3. 3 to 5 min
    4. 10 min
    Show answer

    B. 45 to 60 s. IS 15105:2021 cl. 11.10(b) requires the alarm within 45 to 60 s of water being released or the drain opened at the control valve set. BIS, IS 15105:2021

  2. Q2 Where must the water motor gong be installed?

    1. Inside the pump room
    2. On the outside of an exterior wall
    3. In the control room
    4. Above the highest head
    Show answer

    B. On the outside of an exterior wall. IS 15105:2021 cl. 11.10(d) puts the gong on the outside of an exterior wall, with its centre line not above 6 m from the alarm valve connection. BIS, IS 15105:2021

  3. Q3 For how long must installation pipework withstand 150 percent of the maximum working pressure at acceptance?

    1. 30 min
    2. 60 min
    3. 120 min
    4. 24 h
    Show answer

    C. 120 min. IS 15105:2021 cl. 14.2(a) asks for 120 min at 150 percent of the maximum working pressure. BIS, IS 15105:2021

  4. Q4 At what pressure and for how long is the air leakage test on a pre-action system's downstream piping?

    1. 1 bar for 1 h
    2. 3 bar for 24 h
    3. 7 bar for 2 h
    4. 10 bar for 24 h
    Show answer

    B. 3 bar for 24 h. IS 15105:2021 cl. 14.2(c) asks for an air test at 3 bar for 24 h on piping downstream of the alarm valve of pre-action systems. BIS, IS 15105:2021

Part 4

Get the full 44-question bank

The free sample is 16 of 44 questions. The full bank holds every question with its cited answer, set out as papers you can print and sit against the clock.

Questions about Sprinkler system MCQ

How many questions are in this sprinkler system MCQ bank?

44, in four sets of 11: hazard classes and design density, head spacing and location, pipework pumps and water, and alarms with maintenance.

Where do the answers come from?

Each answer cites a clause of IS 15105:2021, the BIS code of practice for fixed automatic sprinkler systems, first revision, July 2021.

Are these sprinkler questions from past papers?

No. They are Flamekite's own questions written from the standard. Neither exam notice read for this site lists sprinklers as a syllabus topic.

What are the three design densities for sprinklers?

2.25 lpm/m2 over 84 m2 for light hazard, 5 lpm/m2 over 360 m2 for ordinary and 12.2 lpm/m2 over 260 m2 for high hazard (cl. 8.1).

How far apart can sprinkler heads be?

At most 4.5 m in light and ordinary hazard and 3.75 m in high hazard, and never closer than 1.8 m (cl. 9.17).

How often should sprinklers be discharge tested?

At least once in 6 months under cl. 15.6.4(c), with a weekly visual check and a daily 5 min pump run.

Does IS 15105 cover deluge systems?

No. Water spray and deluge systems are in IS 15325 and IS 15519 (cl. 1.4).

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Sources

Each source was opened and read on the date shown. How Flamekite checks its sources

  1. Bureau of Indian Standards: IS 15105:2021, Design, Installation and Maintenance of Fixed Automatic Sprinkler Fire Extinguishing Systems, Code of Practice (first revision), July 2021; free download after registration; clause and table numbers cited on the page (opens in a new tab)checked 26 October 2026
  2. Telangana State Level Police Recruitment Board (TSLPRB): Notification Rc No. 189/Rect./Rect-2/2026 dated 29 July 2026: SCT PC (Civil, AR, SAR CPL), SCT Constable SPF, Fire Fighter (post code 26) and Warder; vacancies, eligibility, selection scheme, Annexures I to III; page numbers cited are the notice's own (57 pages) (opens in a new tab)checked 26 October 2026
  3. Airports Authority of India: Advertisement 01/2025/NR: Junior Assistant (Fire Services), NE-4 (opens in a new tab)checked 24 October 2026
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