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DGCA Air Navigation · 107 questions

Units & Conversions: DGCA Air Navigation Questions and Answers

107 practice questions on Units & Conversions with answers and explanations, plus the key concepts and formulas, from the TrueHeading question bank.

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About this topic

Use this page to revise Units & Conversions for the DGCA Air Navigation paper. Below are the key ideas first, then 12 practice questions with answers and explanations, picked from the 107 questions in the TrueHeading bank for this topic.

In short: Know these cold:

Open the full set in the student zone to answer every question, track your accuracy and take timed mock tests.

Key concepts: Units & Conversions

4 ideas to know cold.

Key distance and speed conversions to remember?

Know these cold:

  • 1 NM = 1852 m = 6076 ft
  • 1 SM = 1609 m = 5280 ft
  • 1 m = 3.281 ft · 1 ft = 0.3048 m
  • 1 kt = 1.852 km/h
  • 1 inHg = 33.86 hPa

Mass, volume and fuel conversions?

Quick table:

mass=volume×density\text{mass}=\text{volume}\times\text{density}
  • 1 kg = 2.205 lb
  • 1 US gallon = 3.785 L · 1 Imp gallon = 4.546 L
  • Avgas density ≈ 0.72 kg/L
  • Jet A-1 density ≈ 0.80 kg/L

Tip: Always check the unit of fuel on the question: litres, US gallons or kg.

Speed, distance, time: the formulas?

Keep minutes and hours straight.

D=S×TD=S\times T
T(min)=D(NM)GS(kt)×60T(\text{min})=\frac{D(\text{NM})}{GS(\text{kt})}\times 60
  • GS 120 kt means 2 NM per minute
  • GS 180 kt means 3 NM per minute

List the key aviation unit conversions.

Memorise these: 1 NM = 1.852 km = 6 076 ft, 1 kt = 0.5144 m/s, 1 ft = 0.3048 m.

  • 1 kg = 2.2046 lb
  • 1 US gal = 3.785 l; 1 imp gal = 4.546 l
  • 1 hPa = 1 mb; 1 in Hg ≈ 33.86 hPa
  • °F = °C × 9/5 + 32
  • Jet A-1 density ≈ 0.8 kg/l; AVGAS ≈ 0.72 kg/l

Practice questions: Units & Conversions

Tap “Show answer” after you have tried each one.

Q1Convert 500 ft to m:

  1. 130 m
  2. 152 m
  3. 190 m
  4. 175 m
Show answer

Answer: B. 152 m

500 × 0.3048 = 152.4 m.

Q2Convert 10 ft to m:

  1. 3 m
  2. 4 m
  3. 5 m
  4. 2 m
Show answer

Answer: A. 3 m

10 × 0.3048 = 3.0 m.

Q3Convert 200 m to ft:

  1. 492 ft
  2. 820 ft
  3. 656 ft
  4. 755 ft
Show answer

Answer: C. 656 ft

200 × 3.2808 = 656.2 ft.

Q4Convert 100 m to ft:

  1. 459 ft
  2. 295 ft
  3. 328 ft
  4. 377 ft
Show answer

Answer: C. 328 ft

100 × 3.2808 = 328.1 ft.

Q5Convert 50 m to ft:

  1. 98 ft
  2. 148 ft
  3. 205 ft
  4. 164 ft
Show answer

Answer: D. 164 ft

50 × 3.2808 = 164.0 ft.

Q6A fuel tank holds 1900 litres of fuel with a specific gravity of 0.72. The mass of fuel is:

  1. 1573 kg
  2. 1368 kg
  3. 1505 kg
  4. 821 kg
Show answer

Answer: B. 1368 kg

Mass = 1900 × 0.72 = 1368 kg.

Q7A fuel tank holds 700 litres of fuel with a specific gravity of 0.75. The mass of fuel is:

  1. 604 kg
  2. 578 kg
  3. 446 kg
  4. 525 kg
Show answer

Answer: D. 525 kg

Mass = 700 × 0.75 = 525 kg.

Q83 000 ft expressed in metres (1 ft = 0.3048 m) is approximately:

  1. 9 843 m
  2. 914 m
  3. 1 500 m
  4. 1 000 m
Show answer

Answer: B. 914 m

3000 × 0.3048 = 914 m.

Q9430 nm converted to kilometres is about:

  1. 796 km
  2. 373 km
  3. 232 km
  4. 692 km
Show answer

Answer: A. 796 km

1 nm = 1.852 km, so 430 × 1.852 = 796 km.

Q10A speed of 480 kt is equal to:

  1. 259 km/h
  2. 772 km/h
  3. 552 km/h
  4. 889 km/h
Show answer

Answer: D. 889 km/h

1 kt = 1.852 km/h, so 480 kt = 889 km/h.

Q1120000 kg expressed in pounds (1 kg = 2.2046 lb) is approximately:

  1. 44 542 lb
  2. 44 092 lb
  3. 9 072 lb
  4. 40 000 lb
Show answer

Answer: B. 44 092 lb

20000 × 2.2046 = 44 092 lb.

Q12The fuel load is 9500 litres and the specific gravity is 0.78. The mass of fuel is:

  1. 7 410 kg
  2. 8 360 kg
  3. 16 336 kg
  4. 12 179 kg
Show answer

Answer: A. 7 410 kg

Mass = volume × density = 9500 × 0.78 = 7 410 kg.

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