ENGINE INSTRUMENTS Flashcards
- What type of sensor is used to measure the output of a low pressure booster pump:
c. bellows
- A vibration meter measures:
b. amplitude at a given frequency
3. Which of the following are used to measure temperature? thermocouple resistance reactance mercury
b. 1, 2, & 4
- A millivoltmeter measuring electromotive force between a hot and a cold junction of a thermocouple can be graduated to read temperature if:
d. the cold junction is maintained at a constant temperature
- If both displays of an EICAS system fail what information will be displayed on the standby engine indicator:
b. N1,EPR, EGT
- A capacitive type gauging system may measure mass due to:
c. fuel dielectric constant being twice that of air and proportional to density
If the intake probe of an EPR system becomes blocked with ice this will cause the EPR gauge to:
b. over-read during take off
The power output of a turbo-propeller aircraft is measured by the amount of torque being produced. The indication can be in which of the following units.
- Newton metres
- PSI
- Percentage
- Pounds feet
- EPR
d. 1, 2, 3, 4
If one probe of a multi-sensor T.G.T. system failed , the reading would:
c. be practically unaffected
During the take-off run , the effect of increasing airspeed is to cause the EPR indication to:
c. decrease
A supercharged aircraft is climbing at its maximum permitted boost of 8 psi (16in.Hg) from sea level to its full throttle height of 10,000 feet. If sea level pressure is 29.92in.Hg , when the aircraft reaches 5000 feet, where the pressure is 24.72in.Hg, what will be the approximate indication on the MAP gauge:
d. 46 in Hg
13 An aircraft has a compensated capacitance fuel contents gauging system and is refuelled so that the total fuel contents are 76000kg at a temperature of 18 degrees C and an S.G. of 0.81. Whilst the aircraft is parked the temperature increases to 26 degrees C and the S.G. becomes 0.80. The indicated fuel contents have:
d. remained the same
- The working principle of a capacitive fuel contents gauging system is based upon:
b. changes in capacitance
- A volumetric fuel flow meter is different to a mass flow meter because the mass flow meter compensates for:
b. density
- Cylinder head temperature measurement works on the principle of:
d. thermocouple
- The electrical tacho generator system uses:
b. three phase a.c. whose frequency varies with the speed of the engine delivered to a three phase synchronous motor (squirrel cage) and drag cup.
- Where very accurate temperature indication is required the indicator used will be:
ratiometer
- Total Air Temperature (TAT) is equal to:
a. SAT + ram rise
- The principle of the fuel-monitoring device giving the fuel burnt is:
d. integration of instantaneous flow
- To measure the fuel quantity on a heavy aircraft we use:
- capacitor gauges
- electric gauges with round floats
- the indication can directly be indicated as a mass
- the indication can not be indicated as a mass
The combination of all correct statements is:
d. 1, 3