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DGCA Technical General · 34 questions

Temperature Indicators: DGCA Technical General Questions and Answers

34 practice questions on Temperature Indicators 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 Temperature Indicators for the DGCA Technical General paper. Below are the key ideas first, then 12 practice questions with answers and explanations, picked from the 34 questions in the TrueHeading bank for this topic.

In short: Thermocouples (two dissimilar metals) produce a voltage.

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Key concepts: Temperature Indicators

2 ideas to know cold.

How is temperature measured in an engine?

Thermocouples (two dissimilar metals) produce a voltage.

TATSAT=1+0.2 K M2(temperatures in K)\frac{TAT}{SAT}=1+0.2\,K\,M^2\quad(\text{temperatures in K})
  • EGT: chromel–alumel · CHT: iron–constantan
  • Resistance thermometers for oil and air temperature
  • Total air temperature includes ram rise

What are SAT, TAT and RAT?

SAT: static (outside) air temperature. TAT: total air temperature including ram rise. RAT: the ram air temperature rise.

TAT=SAT(1+0.2M2)TAT=SAT\left(1+0.2M^2\right)
  • TAT = SAT (1 + 0.2 M²), in kelvin
  • At M 0.8, ram rise ≈ 28 °C
  • Thermocouples measure EGT

Practice questions: Temperature Indicators

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

Q1SAT is −56 °C and the aircraft flies at Mach 0.80 with a probe recovery factor of 1. The TAT is approximately:

  1. −19 °C
  2. 0 °C
  3. −28 °C
  4. −34 °C
Show answer

Answer: C. −28 °C

TAT = SAT × (1 + 0.2 M²) with temperatures in kelvin.

Q2SAT is −50 °C and the aircraft flies at Mach 0.78 with a probe recovery factor of 1. The TAT is approximately:

  1. −14 °C
  2. −23 °C
  3. 4 °C
  4. −29 °C
Show answer

Answer: B. −23 °C

TAT = SAT × (1 + 0.2 M²) with temperatures in kelvin.

Q3SAT is −40 °C and the aircraft flies at Mach 0.74 with a probe recovery factor of 1. The TAT is approximately:

  1. −20 °C
  2. −5 °C
  3. −14 °C
  4. 11 °C
Show answer

Answer: C. −14 °C

TAT = SAT × (1 + 0.2 M²) with temperatures in kelvin.

Q4SAT is −60 °C and the aircraft flies at Mach 0.84 with a probe recovery factor of 1. The TAT is approximately:

  1. −30 °C
  2. −36 °C
  3. −21 °C
  4. 0 °C
Show answer

Answer: A. −30 °C

TAT = SAT × (1 + 0.2 M²) with temperatures in kelvin.

Q5SAT is −20 °C and the aircraft flies at Mach 0.76 with a probe recovery factor of 1. The TAT is approximately:

  1. 18 °C
  2. 38 °C
  3. 3 °C
  4. 9 °C
Show answer

Answer: D. 9 °C

TAT = SAT × (1 + 0.2 M²) with temperatures in kelvin.

Q6SAT is −56 °C and the aircraft flies at Mach 0.85 with a probe recovery factor of 1. The TAT is approximately:

  1. −16 °C
  2. 7 °C
  3. −25 °C
  4. −31 °C
Show answer

Answer: C. −25 °C

TAT = SAT × (1 + 0.2 M²) with temperatures in kelvin.

Q7SAT is −35 °C and the aircraft flies at Mach 0.80 with a probe recovery factor of 1. The TAT is approximately:

  1. −11 °C
  2. −5 °C
  3. 4 °C
  4. 26 °C
Show answer

Answer: B. −5 °C

TAT = SAT × (1 + 0.2 M²) with temperatures in kelvin.

Q8SAT is −30 °C and the aircraft flies at Mach 0.82 with a probe recovery factor of 1. The TAT is approximately:

  1. 35 °C
  2. 3 °C
  3. 12 °C
  4. −3 °C
Show answer

Answer: B. 3 °C

TAT = SAT × (1 + 0.2 M²) with temperatures in kelvin.

Q9−40 °C is equal to:

  1. −40 °F
  2. −30 °F
  3. −8 °F
  4. 10 °F
Show answer

Answer: A. −40 °F

°F = °C × 9/5 + 32.

Q1030 °C is equal to:

  1. 49 °F
  2. 96 °F
  3. 86 °F
  4. 62 °F
Show answer

Answer: C. 86 °F

°F = °C × 9/5 + 32.

Q11100 °C is equal to:

  1. 132 °F
  2. 222 °F
  3. 88 °F
  4. 212 °F
Show answer

Answer: D. 212 °F

°F = °C × 9/5 + 32.

Q1237 °C is equal to:

  1. 53 °F
  2. 69 °F
  3. 99 °F
  4. 109 °F
Show answer

Answer: C. 99 °F

°F = °C × 9/5 + 32.

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More DGCA Technical General topics

Aerodynamics & Performance181 QFlight Controls & Stability38 QAirframe & Structures25 QPowerplant79 QPropellers32 QAircraft Systems116 QPitot Statics35 QBarometric Altimeters61 QRadio Altimeters37 QVertical Speed Indicators (VSI)32 QAirspeed Indicators24 QAirspeeds41 QMach55 QGyroscope52 QAttitude Indicators20 QTurn and Slip50 QINS, IRS and FMS32 QEFIS24 QAutoflight23 QFlight Director21 QEICAS / ECAM24 QEngine Instruments29 QFuel Systems35 QCompass54 QWarning & Recording Systems33 QTCAS39 Q
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