Free Practice Questions for MMO MTDD Industrial Gas Conversion

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Sample MMO MTDD Industrial Gas Conversion Practice Questions

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

1An industrial gas isometric shows a regulator between two pipe sections. Which information most directly prevents a misleading hydraulic calculation?

A.Using one nominal pressure for the entire plant

B.Identifying the pressure level and flow basis on each side of the regulator

C.Showing only the maximum connected thermal input

D.Omitting the regulator because it is factory assembled

Explanation: A regulator creates distinct pressure regions, so actual gas volume and available pressure differ across it. The drawing and calculation schedule must identify those regions consistently.

2A project calculation lists a 20 m overhead run, but its isometric omits an actual 4 m vertical offset and its bends. What should be corrected?

A.Only the drawing scale

B.Only the meter designation

C.The developed route, fitting inventory and affected pressure-loss calculations

D.Only the thermal input of the burners

Explanation: The actual route controls both developed pipe length and local resistances. Correcting the isometric and calculation together preserves traceability between the designed network and its hydraulic model.

3A meter must accurately cover actual operating flows from 12 to 180 m³/h at its installed pressure and temperature. Which stated meter range covers both endpoints?

A.20–250 m³/h

B.8–160 m³/h

C.15–200 m³/h

D.10–200 m³/h

Explanation: The minimum operating flow must be at least the meter's lower limit, and maximum flow must not exceed its upper limit. Only 10–200 m³/h covers 12–180 m³/h; pressure rating, gas compatibility and pressure loss still need checking.

4A gas line operates at 1.5 bar gauge where atmospheric pressure is 1.0 bar. What inlet pressure belongs in a formula based on squared absolute pressures?

A.0.5 bar absolute

B.1.0 bar absolute

C.1.5 bar absolute

D.2.5 bar absolute

Explanation: Absolute pressure is gauge pressure plus local atmospheric pressure. The inlet value is therefore 1.5+1.0 = 2.5 bar absolute before it is squared.

5An ideal-gas exercise specifies 100 reference m³/h at 1.0 bar absolute and 273 K. At 2.0 bar absolute and 300 K, what actual flow results? Use Qa = Qr(Pr/Pa)(Ta/Tr), with equal compressibility factors.

A.50.0 m³/h

B.54.9 m³/h

C.91.0 m³/h

D.219.8 m³/h

Explanation: Actual flow is 100 × (1/2) × (300/273) = 54.9 m³/h. Both pressures must be absolute and both temperatures must be on the Kelvin scale.

6At a particular line condition, actual gas flow is 55 m³/h through a 50 mm internal-diameter pipe. What mean velocity results?

A.3.89 m/s

B.28.0 m/s

C.7.78 m/s

D.14.1 m/s

Explanation: Area is π × 0.050²/4 = 0.001963 m² and flow is 55/3600 = 0.01528 m³/s. Dividing flow by area gives 7.78 m/s; reference volume must first be converted if it is supplied instead.

7A supplied compressible-flow model gives p1²-p2² = 0.64 bar². With p1 = 2.00 bar absolute and atmospheric pressure 1.00 bar, what outlet gauge pressure follows?

A.0.833 bar gauge

B.1.360 bar gauge

C.1.833 bar gauge

D.0.360 bar gauge

Explanation: Outlet absolute pressure is √(2.00²-0.64) = 1.833 bar. Subtracting atmospheric pressure gives 0.833 bar gauge; the squared-pressure difference is not a simple pressure drop.

8At fixed diameter and gas conditions, a model has p1²-p2² proportional to reference flow squared. Initially p1 = 3 bar absolute and p1²-p2² = 1 bar². If flow doubles with p1 unchanged, what is the new p2?

A.2.83 bar absolute

B.2.24 bar absolute

C.1.41 bar absolute

D.2.00 bar absolute

Explanation: Doubling flow increases the squared-pressure difference by four, to 4 bar². The new outlet pressure is √(9-4) = 2.24 bar absolute.

9An exercise requires p2 ≥ 2.6 bar absolute from p1 = 3.0 bar absolute. At 50 mm internal diameter, its model predicts p1²-p2² = 3.6 bar², scaling as D⁻⁵. Actual flow at the checked section is 100 m³/h and velocity must be ≤12 m/s. Which smallest listed internal diameter meets both limits?

A.50 mm

B.52 mm

C.55 mm

D.60 mm

Explanation: The squared-pressure allowance is 9-6.76 = 2.24 bar², requiring D ≥ 50(3.6/2.24)^(1/5) = 54.977 mm. At 55 mm the velocity is 11.69 m/s and predicted outlet pressure is about 2.601 bar absolute, so both checks pass.

10The same mass flow passes through two equal-diameter gas sections at equal temperature. Section A has twice the absolute pressure of B; assume ideal-gas behavior. How do their mean velocities compare?

A.vA = 2vB

B.vA = vB

C.vA = 4vB

D.vA = 0.5vB

Explanation: At equal temperature, ideal-gas density is proportional to absolute pressure. With equal mass flow and area, doubling density halves actual volumetric flow and mean velocity.

About the MMO MTDD Industrial Gas Conversion Exam

Independent practice for MTDD industrial and large-consumption natural-gas conversion. Study the full project rubric, with particular attention to pressure basis, actual gas volume and critical-path calculations.

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

210-minute written project, pass 70/100. Official marks: isometric detail 10; meter 6; above-50-mbar pipe, pressure and velocity calculations 40; lower-pressure coefficients 5 and losses 25; ventilation 10; expansion 4. No separate oral or hands-on component is described on the scheme page.

Time Limit

210 minutes

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 MTDD qualification scheme · Source checked 2026-10-21Authoritative project rubric, prerequisites, duration and pass mark.
2026 MTDD course and examination notice · Source checked 2026-10-21February 2026 course: mandatory attendance, basic-training prerequisite, written assessment and separate examination booking.
PBK current fee page · Source checked 2026-10-21Certificate tariff is separate from course tuition; no additional engineering examination fee.

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.

2 items (10%)

Isometric detail

Pressure zones and documented geometry.

1 item (5%)

Meter selection

Operating range; official rubric gives this 6%.

8 items (40%)

Above-50-mbar calculations

Absolute pressure, volume conversion, velocity and compressible-flow models.

1 item (5%)

Lower-pressure fitting coefficients

Coefficient accounting and velocity basis.

5 items (25%)

Lower-pressure losses

Friction, fittings and network pressure budgets.

2 items (10%)

Ventilation

Interlocks and opening calculations.

1 item (5%)

Thermal expansion

Free expansion; official rubric gives this 4%.

Preparing for the MMO MTDD Industrial Gas Conversion Exam

What You Need to Know

Passing score: 70/100
Assessment: 210-minute written project, pass 70/100. Official marks: isometric detail 10; meter 6; above-50-mbar pipe, pressure and velocity calculations 40; lower-pressure coefficients 5 and losses 25; ventilation 10; expansion 4. No separate oral or hands-on component is described on the scheme page.
Time limit: 210 minutes
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 MTDD Industrial Gas Conversion: Suggested Study Strategy

1Use absolute pressure in compressible-flow equations.

2Identify reference conditions before converting flow to actual velocity.

3Complete full project drawings and use the relevant distributor's current requirements.

Frequently Asked Questions

What training is specified?

The PBK scheme lists mechanical engineering and at least 12 hours of basic plus 12 hours of industrial gas training. The reviewed 2026 course also identifies basic training as the prerequisite; confirm your current eligibility with MMO.

Are the practice proportions exact official weights?

At 20 MCQs, meter selection and expansion are rounded to one item each (5% each) versus official marks of 6% and 4%. The remaining practice proportions reproduce the published rubric percentages; MCQs still do not reproduce its written format.

Which assessment languages are confirmed?

The reviewed sources do not name permitted response languages. Ask PBK for the chosen sitting; this resource does not imply an official English examination.