Free Practice Questions for MMO MTHA Ventilation Installation

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Sample MMO MTHA Ventilation Installation Practice Questions

Try these sample questions to review concepts for the MMO MTHA Ventilation Installation exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 20+ question experience with AI tutoring.

1For a fixed-speed fan serving a duct network, what normally determines the operating airflow?

A.The fan's maximum free-delivery flow alone

B.The intersection of the fan pressure curve and system resistance curve

C.The motor nameplate current alone

D.The sum of every branch's free-delivery capacity

Explanation: The operating point satisfies both the fan's pressure capability and the network's pressure requirement. Changing system resistance or fan speed moves that point.

2At unchanged airflow, a filter's pressure drop rises from 80 Pa clean to its specified replacement condition of 180 Pa. What should the design pressure allowance recognize?

A.Only 80 Pa, because that is the commissioning condition

B.Zero pressure drop if the filter has a high efficiency rating

C.The specified loaded-filter condition and the fan/control capability to maintain flow

D.A lower pressure requirement because collected dust increases filter area

Explanation: A filter's resistance changes as it loads, so design and control checks must consider the specified service condition. Filtration efficiency and pressure drop are distinct selection properties.

3An air coil is proposed at a higher face velocity than the manufacturer's rated selection. Which review is needed before accepting it?

A.Check only that its pipe connections accommodate the design water flow

B.Scale thermal capacity linearly with airflow while retaining the original air pressure drop

C.Check only water pressure drop because catalogue thermal performance is independent of air velocity

D.Recheck air pressure drop, thermal performance and any condensate carryover limitation at the new condition

Explanation: Coil performance depends on the actual air and fluid conditions. Increased face velocity can change pressure drop and heat transfer, while a wet cooling coil also needs a carryover check.

4What does the equal-friction duct-sizing method primarily keep approximately constant in the selected main and branch sections?

A.Straight-duct friction loss per unit length

B.Total pressure loss of every complete branch regardless of length

C.Velocity in every duct regardless of flow

D.Static pressure at every outlet without balancing

Explanation: Equal-friction sizing uses a selected pressure-loss rate per unit length. Different path lengths, fittings and terminal losses still create unequal path resistance and may require balancing.

5A ceiling diffuser catalogue gives throw to a stated terminal velocity for isothermal testing. What must be considered when using it for cold supply air?

A.Only the grille's nominal neck diameter

B.The effect of temperature difference and buoyancy on the air pattern and occupied-zone conditions

C.Only matching catalogue pressure drop while disregarding supply-to-room temperature difference

D.That isothermal throw must always equal non-isothermal throw

Explanation: Cold supply air can behave differently from an isothermal jet because buoyancy changes its trajectory. Selection must assess the relevant temperature difference, throw, drop and occupied-zone comfort using suitable manufacturer data.

6Two terminals deliver the required airflow, but one exceeds the project's room noise criterion. Which conclusion is appropriate?

A.Both are acceptable because airflow is the only terminal criterion

B.The quieter terminal must have insufficient airflow

C.The noisier terminal requires reselection or acoustic/design changes

D.Noise can be ignored if the duct diameter is unchanged

Explanation: Terminal selection must satisfy the project's acoustic requirements as well as airflow and distribution needs. Meeting one criterion does not demonstrate overall suitability.

7A design worksheet specifies outdoor air at 8 L/s per person plus 0.5 L/s per square metre. For 20 people in 100 m², with no further effectiveness correction, what outdoor-air quantity results?

A.160 L/s

B.50 L/s

C.260 L/s

D.210 L/s

Explanation: The people contribution is 20 × 8 = 160 L/s and the area contribution is 100 × 0.5 = 50 L/s. Adding them gives 210 L/s under the stated worksheet assumptions; these rates are not asserted as universal occupancy requirements.

8A zone needs 240 L/s of breathing-zone outdoor air. For this exercise, distribution effectiveness is 0.8 and zone outdoor air equals that requirement divided by effectiveness. A separate exhaust balance requires at least 350 L/s of outdoor replacement air with no transfer air. Which minimum outdoor supply meets both constraints?

A.350 L/s

B.300 L/s

C.590 L/s

D.650 L/s

Explanation: The effectiveness-adjusted requirement is 240/0.8 = 300 L/s. The separate replacement-air constraint is 350 L/s, so 350 L/s satisfies both; the two quantities are compared rather than added when the same outdoor supply serves both purposes.

9A rectangular duct has internal dimensions 0.50 m by 0.30 m and carries 0.90 m³/s. What is its mean air velocity?

A.3.0 m/s

B.6.0 m/s

C.9.0 m/s

D.12.0 m/s

Explanation: The flow area is 0.50 × 0.30 = 0.15 m². Mean velocity is Q/A = 0.90/0.15 = 6.0 m/s.

10A trunk carries 1.40 m³/s before a branch removes 0.45 m³/s. Neglecting leakage, what flow belongs in the next trunk section's sizing calculation?

A.1.85 m³/s

B.1.40 m³/s

C.0.95 m³/s

D.0.45 m³/s

Explanation: Mass continuity at essentially constant density gives remaining trunk flow 1.40-0.45 = 0.95 m³/s. The upstream trunk must still be sized for the combined flow.

About the MMO MTHA Ventilation Installation Exam

Independent practice for the separate MTHA ventilation qualification. Study equipment theory and complete fresh-air and duct-network calculations; MTKT air conditioning is a distinct assessment.

Exam sponsor: TMMOB Makina Mühendisleri Odası (MMO) / PBK. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Theory: 30 minutes, 30 points across fans, filters, coils, ducts and terminals. Projects: 150 minutes, with fresh-air quantity worth 10 points and duct sizing/pressure worth 60. Pass 70/100. No separate oral or hands-on component is identified in the published scheme.

Time Limit

180 minutes (30 + 150)

Passing Score

70/100

Exam / Certification Fees

Published PBK tariff checked 21 October 2026: TRY 1,500 certificate including VAT; no additional examination fee. Training separate; confirm current charges.

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

PBK MTHA qualification scheme · Source checked 2026-10-21Identity, theory/project rubric, prerequisites, timing and pass threshold.
PBK current fee page · Source checked 2026-10-21Engineering certificate tariff; course tuition separate.
MMO 2026 course catalogue · Source checked 2026-10-212026 ventilation training offerings; confirm the chosen examination booking with MMO.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

6 items (30%)

Equipment and terminal theory

Fans, filters, coils and ducts: one item each; terminals: two items.

2 items (10%)

Fresh-air quantity

Outdoor-air and replacement-air calculations with stated inputs.

12 items (60%)

Duct design and pressure

Six sizing/design items and six pressure/power items.

Preparing for the MMO MTHA Ventilation Installation Exam

What You Need to Know

Passing score: 70/100
Assessment: Theory: 30 minutes, 30 points across fans, filters, coils, ducts and terminals. Projects: 150 minutes, with fresh-air quantity worth 10 points and duct sizing/pressure worth 60. Pass 70/100. No separate oral or hands-on component is identified in the published scheme.
Time limit: 180 minutes (30 + 150)
Exam / certification fees: Published PBK tariff checked 21 October 2026: TRY 1,500 certificate including VAT; no additional examination fee. Training separate; confirm current charges. Official sources

Using Our Practice Resources

Work through all 20 available questions
Review every answer and explanation
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MMO MTHA Ventilation Installation: Suggested Study Strategy

1Use the correct reference velocity for each fitting coefficient.

2Separate static, velocity and total pressure.

3Identify the controlling complete path rather than adding parallel paths.

Frequently Asked Questions

What eligibility does PBK publish?

The scheme specifies mechanical engineering, the mechanical-installation qualification and at least 12 hours of ventilation training. Confirm current enrolment conditions with MMO.

What are the official assessment languages?

The reviewed sources do not specify permitted response languages. Confirm directly with PBK; English MCQs here do not establish an official English sitting.

Does this reproduce the examination format?

No. The practice proportions follow the published point split, but the official assessment includes substantial written project work. Practise complete drawings, segment schedules and pressure calculations alongside these MCQs.