Powerplant And System Monitoring Instruments

Question 1

The more sophisticated type of stall warning system takes in consideration the following?

Answer 1

1. Angle of attack
2. flap and, where fitted, slat positions
3. Landing gear weight-on position
4. Airspeed

Question 2

The two alpha probes, or angle of attack sensors, fall under what two categories?

Answer 2

1. The conical type

2. The vane type

Question 3

The type of angle of attack detection system that use a cone shaped probe that is at right angles of the airflow, is called?

Answer 3

Conical Probe

Question 4

The type of angle of attack detection system that makes use of an aerofoil shaped vane, attached to an arm, protruding into the airflow is called?

Answer 4

The vane-type detector

Question 5

The pressure indication of the manifold is taken at the?

Answer 5

Induction Manifold

Question 6

Manifold pressure is measured against?

Answer 6

Absolute zero, the pressure in a vacuum.

Question 7

The EPR probe can be found where?

Answer 7

Facing into the airflow at the engine air intake

Question 8

Define the EPR?

Answer 8

The Engine Pressure Ratio, or EPR, is the ratio of high pressure (HP) turbine exhaust pressure to Low Pressure (LP) compressor inlet pressure in gas turbine engine.

Question 9

EPR is directly proportional to?

Answer 9

The thrust produced

Question 10

A gauge have a sensor connected to a pressure source which transmits pressure data electronically to the gauge, this type of fuel and oil pressure gauge is called?

Answer 10

A remote indicating gauge

Question 11

A gauge have a line containing the fluid being measured routed directly to the gauge, is called?

Answer 11

A Direct Reading gauge

Question 12

Fuel pressure gauges usually make use of?

Answer 12

Remote sensing devices

Question 13

Oil pressure gauges usually makes use of a?

Answer 13

Bourden Tube.

Question 14

The other name for an RPM indicator?

Answer 14

Tachometer

Question 15

Gas turbine engine’s RPM will usually be displayed as a?

Answer 15

Percentage

Question 16

How the mechanical, or magnetic drag tachometer works?

Answer 16

The crankshaft turn a drive shaft at half the crankshaft speed using gears, the drive shaft rotates a series of small magnets inside a copper aluminium drag-cup, the drag caused by the magnets makes the cup turn in the same direction as the magnets with gives us the RPM reading.

Question 17

How does the Tacho-generator and indicator system work?

Answer 17

The electrical tachometer makes use of a small three-phase AC generator which is driven by the engine gearbox. The output is used to drive a synchronous motor which in turn drives the tachometer in the cockpit.

Question 18

How does the Tachometer Probe and indicator system work?

Answer 18

This type of system is used on gas turbine engines. It comprises a toothed wheel, called a phonic wheel, that is mounted on the high compression shaft and a probe unit mounted on the case adjacent to the wheel. The probe consists of magnets and a coil, the rotating phonic wheel generates an electrical signal pulse, of which the frequency will be proportional to the engine RPM.

Question 19

The basic principle of a capacitance fuel gauge system is that the :

Answer 19

capacity of a capacitor depends on the nature of the dielectric in which it is immersed.

Question 20

Increase and decrease of engine power alters the?

Answer 20

Pressure bellows

Question 21

Larger aircraft, for gauging fuel, use what principle?

Answer 21

Electrical capacitance of the fuel.