instrumentation

Question 1

what is the voltmeter indicative of

Answer 1

battery condition

Question 2

what do ammeters do

Answer 2

ensure generator/altimeter is keeping up with demand

Question 3

what is a centre-zero ammeter

Answer 3

an ammeter that gives quick indication of health of electrical system

Question 4

what does it mean when needle is centred on centre-zero ammeter

Answer 4

all power is being supplied by the alternator and the battery is fully charged

Question 5

what does it mean when needle is to the right of centre + on centre-zero ammeter

Answer 5

charging - alternator and battery are fully charged

Question 6

what does it mean when the needle is to the left of centre

Answer 6

discharging – alternator is unable to supply power and battery used

Question 7

what should you do in the event of alternator failure

Answer 7

1. reduce load to essentials
2. inform someone
3. use alternative means of navigation
4. prepare to divert around controlled airspace
5. land as soon as possible

Question 8

what are the different types of pressure instrumentation

Answer 8

aneroid capsule
bellows type
bourdon tube

Question 9

what is an aneroid capsule gauge

Answer 9

flat can made of thin metal where pressure causes the height of the can to change (low pressure)

Question 10

what is bellows type gauge

Answer 10

a stacked can that changes dimensions due to a pressure (moderate pressure)

Question 11

what is a bourdon tube gauge

Answer 11

is a flat curved metal tube that tries to straighten under pressure (high)

Question 12

how is fuel pressure taken in injection engines

Answer 12

absolute pressure of intake system is near fuel inlet valve

Question 13

where is fuel pressure supplied to in carburettor engines

Answer 13

pressure of fuel is supplied to float chamber

Question 14

what situations shown on the oil pressure and temperature gauges would show oil temperature gauge malfunction?

Answer 14

normal oil pressure
high or low oil temperature

Question 15

what situations shown on the oil pressure and temperature gauges would show oil pressure gauge malfunction?

Answer 15

high or low oil pressure
normal oil temperature

Question 16

what situations shown on the oil pressure and temperature gauges would show oil being lost as it gets hotter?

Answer 16

low oil pressure
high oil temperature

Question 17

what are the types of fuel gauges

Answer 17

float type
capacitance type

Question 18

how does the capacitance type of fuel gauge work

Answer 18

fuel alters the dialectric properties between the two plates
- normally used