Electrical Power Systems

Question 1

DC Voltmeter indicates:

Answer 1

Voltage on the Battery-Charging bus

Question 2

When a GPU is used for engine start, the output value should be :

Answer 2

Regulated to 28 VDC and limited to 500 amps minimum and 1100 amps maximum.

Question 3

Buses that the airplane batteries power are:

Answer 3

All buses including AC if an inverters is on

Question 4

A generator failure is indicated when:

Answer 4

The GEN switch is in the ON position and the GEN light remains illuminated after activating RESET

Question 5

IF airplane electrical power fails and the EMER PWR BAT 1 switch is ON, the systems powered by the emergency battery are:

Answer 5

Standby attitude gyro
Landing Gear
Flaps

Question 6

If both 275-amp current limiters fail in flight:

Answer 6

The essential buses will remain powered by the air craft batteries and generators

Question 7

Illumination of a PRI or SEC inverter light indicates:

Answer 7

-The inverter output is less than 90 VAC, or there is less than a 10 volt-ampere draw on the inverter

OR

-The inverter switch is off

Question 8

The AC voltmeter will indicate:

Answer 8

Left AC bus voltage when the AC BUS switch is in PRI

Question 9

IF an overload sensor shuts off power to a main bus power may be restored by:

Answer 9

Resetting the control CB after the overload sensor resets

Question 10

To unlock the entrance door when batteries are dead:

Answer 10

Remove both batteries for charging and reinstall

Question 11

With a dual-generator failure in flight the airplane batteries will support the minimum night IFR equipment load for approximately:

Answer 11

30 minutes

Question 12

Inverter output is :

Answer 12

115 VAC, 400 Hz

Question 13

The approved AFM recommends that the GPU be used for engine start when the ambient temperature is:

Answer 13

32F (0°C) or below

Question 14

When either the primary or secondary inverter light illuminates the first step of corrective action is:

Answer 14

Check for open INV or AC BUS circuit breaker(s)

Question 15

Primary DC electrical power is provided by

Answer 15

Two engine-driven brushless DC generators

Question 16

DC Generators are rated at

Answer 16

30 volts 400 amps / ea.

Question 17

Secondary DC power is provided by :

Answer 17

The two batteries.

Question 18

Three ways to power the entire DC and AC Systems

Answer 18

GPU
Engine-Driven Generator
Batteries

Question 19

How do you know if the lear has NiCad batteries or Lead Acid

Answer 19

NiCad - Stainless steel covers

Lead Acid - comes with a sump jar

Question 20

Minimum voltage requirement for battery relays to close (and subsequently be used)

Answer 20

16 volts

Question 21

What are the names of all buses:

Answer 21

L and R Battery Bus
Battery - Charging Bus 
L and R Generator Bus
L and R PWR Bus
L and R Main Bus

Question 22

Left Battery Bus powers: (3)

Answer 22

Left Stall Warning
Entry lights
Door actuator Motor

Question 23

Right Battery bus powers: (1)

Answer 23

Right Stall Warning System

Question 24

Battery-Charging Bus powers: (9)

Answer 24

DC VOLTS meter
Freon Air conditioner & Aux. Heater
Recognition Lights 
Auxiliary Hyd. Pump
Fuel Flow Indicating System 
Primary Pitch Trim Motor 
L and R Engine Starters 
Aux. Inverter (If Installed) 
Utility Light (if installed)