Discussion
Match each instrument in List I with what it indicates in List II.
List I
A. Tachometer
B. Engine pressure ratio
C. Torquemeter
D. Manifold pressure gauge
List II
1. Rotor speed as a percentage of a datum
2. Turbine discharge over compressor inlet pressure
3. Shaft torque on a turboprop
4. Absolute pressure in the induction manifold
Select the correct match.
Answer: B
Correct answer: A-1, B-2, C-3, D-4
Each instrument reports a different quantity. A tachometer indicates rotor speed as a percentage of a chosen datum rather than in rpm, so that one scale and one set of limits serve engines of different absolute speeds.
Engine pressure ratio is turbine discharge over compressor inlet pressure. A torquemeter measures shaft torque, which with governed rpm gives power on a turboprop. A manifold pressure gauge reads absolute pressure in the induction manifold - absolute, which is why it indicates ambient with the engine stopped rather than zero.
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