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WorksheetsUH-60A|Electrical
Total questions: 68
Worksheet time: 2hrs 42mins
Name
Class
Date
1.
What is the primary source of electrical power of an UH-60 helicopter?
a)
AC current
b)
DC current
2.
How many independent AC power sources can we find in an UH-60 helicopter?
a)
1
b)
2
c)
3
3.
UH-60's electrical AC generators generate:
a)
26 VAC
b)
115/200 VAC
c)
28 VDC
4.
How is DC current obtained in an UH-60 helicopter?
a)
From a DC generator
b)
From battery only
c)
By conversion rom AC current
5.
Which AC system is capable supplying the total helicopter electrical requirements?
a)
Auxilliary system only
b)
#1 system or #2 system
c)
any of the three AC systems
6.
DC current is obtained by conversion from ____________
a)
AC primary busses
b)
AC essential busses
c)
APU bus
7.
Which electrical power source has the highest priorty (will supersede another system/s)?
a)
External power
b)
#1 or #2 main generator
c)
APU generator
8.
Which power source has higher priority (will supersede the other system)?
a)
APU
b)
External power
9.
Main electrical generators are driven by ______________
a)
Transmission accessory modules
b)
Engine accessory gearboxes
c)
transmission input modules
10.
Each main electrical generator provides ______________
a)
26 VAC, 400Hz
b)
115/200 VAC, 400Hz
c)
115/200 VDC
11.
Each main electrical generator is cooled ______________
a)
by ram air
b)
by engine oil
c)
by transmission oil
12.
Select correct statement:
a)
Each main generator has the capability of providing all AC power for the aircraft if the other generator should fail INCLUDING the blade de-ice system.
b)
Each main generator has the capability of providing all AC power for the aircraft if the other generator should fail EXCEPT the blade de-ice system.
13.
What cautions are associated with the main generators?
a)
#1 GEN and #2 GEN
b)
#1 GEN BRG and #2 GEN BRG
c)
#1/2 GEN, and
#1/2 GEN BRG
14.
Where would you look for the main generators switches?
a)
Overhead panel
b)
Central pedestal
c)
Instrument panel
15.
What are the main generators control switches' position
a)
ON-OFF-RESET
b)
ON-OFF-RESET
c)
ON-OFF/RESET-TEST
16.
Where would you look for APU electrical generator?
a)
On the front of the APU
b)
On the side of the APU
c)
At the rear of the APU
17.
Each main electrical generator supplies the helicopter with ____________
a)
single-phase AC current
b)
3-phase DC current
c)
3-phase AC current
18.
The APU generator supplies ______________ to the aircraft.
a)
single-phase 115 VAC
b)
three-phase 115 VAC
c)
three-phase 115/200 VAC
19.
The APU electrical generator is cooled by ______________
a)
transmission oil
b)
air
c)
APU oil
20.
Select correct statement about the APU generator operation while being single source of AC power:
a)
It can power all equipment on board the aircraft without exceptions
b)
It cannnot power backup pump and windshield anti-ice at the same time. Backup pump has priority.
c)
It cannnot power backup pump and windshield anti-ice at the same time. Windshield anti-ice has priority.
21.
Can blade de-ice system be powered by just one electrical generator?
a)
Yes, #1 generator has the capability
b)
Yes, either #1 or #2 generator has the capability
c)
No, at least 2 generators must be running to power the system
22.
What are the APU generator control switch positions?
a)
ON-OFF-RESET
b)
ON-OFF-TEST
c)
ON-OFF/RESET
23.
Where would you look for the APU generator control switch?
a)
Overhead panel
b)
Central lower panel
c)
Instrument panel
24.
When the APU GEN ON advisory is ON, ________________
a)
the APU generator is the sole source of the AC power on board
b)
the APU generator is up and running along one or both main genarators
c)
the APU generator shall be switched ON
25.
How many GCUs will you find in the Blackhawk?
a)
1
b)
2
c)
3
26.
Where would you find Generator Control Units?
a)
Nose compartment (avionic bay)
b)
forward cabin ceiling
c)
mid-fuselage
27.
List all functions of a GCU (in addition to voltage regulation)
a)
Overvoltage protection
Undervoltage protection
Underfrequency protection
Overfrequency protection
b)
Overvoltage protection
Undervoltage protection
Underfrequency protection
Feeder fault protection
c)
Overvoltage protection
Undervoltage protection
Underfrequency protection
28.
List UH-60s AC buses
a)
#1 AC primary bus
#2 AC primary bus
AC Essential bus
b)
#1 AC primary bus
#2 AC primary bus
AC Eemergency bus
c)
#1 AC primary bus
#2 AC primary bus
AC utility bus
29.
AC Essential bus is supplied _____________________
a)
200 VAC power
b)
115 VAC power
c)
26 VAC power
30.
AC Essential bus is powered by __________________
a)
#1 main generator
b)
#2 main generator
c)
#1 or #2 main generator
31.
External power receptacle is located where?
a)
At the nose of the helicopter
b)
RH side of the helicopter under the crew chief's window
c)
LH side of the helicopter under the gunner's window
32.
Where would you look for AC current limiters?
a)
Overhead cabin area
b)
Nose of the helicopter
c)
Within each GCU
33.
The external power receptacle can receive ______________
a)
AC and DC power
b)
DC power
c)
AC power only
34.
How can the pilot say the external power power is connected?
a)
APU generator cannot be brought online
b)
EXT PWR CONNECTED advisory comes on
c)
EPU ON advisory comes on
35.
In order to let the external power in, ___________________
a)
only the external power needs to be inserted and running
b)
external power must be inserted, running and the external power switch must be switched ON
c)
external power must be inserted, running and the external power monitor must be switched ON
36.
How do you reset the external power monitor?
a)
Move the external power switch to "RESET"
b)
Move the external power switch to OFF, the ON
c)
Push the RESET pushbutton on the external power monitor
37.
What is the primary source of DC power on board the UH-60 helicopter?
a)
Lead-acid battery
b)
Ni-Cad battery
c)
2 transformer-rectifiers
38.
There is/are __________ external DC power connectors in an UH-60.
a)
1
b)
2
c)
no
39.
List busses tah can be powered by the battery.
a)
Battery bus
DC Essential bus
b)
Battery utility bus
Battery bus
DC Essential bus
c)
Battery utility bus
Battery hot bus
DC Essential bus
DC primary buses
40.
What is the condition to be met in order to get the DC power from the battery to the DC essential bus?
a)
There are no conditions. DC Essential bus is always powered by the battery anytime the battery is connected
b)
There must be no power supplied from #1 or #2 DC Primary busses and the battery switch must be ON
c)
There must be no power supplied from #1 or #2 DC Primary busses and the battery must be connected. Battery switch positionn is irrelevant.
41.
Which DC bus is always powered (hot) when the battery is connected?
a)
Battery Utility Bus
b)
Battery Bus
c)
DC Essential bus
42.
#1 CONV and/or #2 CONV caution means:
a)
#1 and/or #2 converter are on and running
b)
#1 and/or #2 converter switches are ON
c)
#1 and/or #2 converter is/are not working
43.
DC ESS BUS OFF caution will come on (disregarding other conditions), when __________________
a)
Ni-Cad battery is at or below 35% state of charge
b)
Lead-acid battery is at or below 23 VDC
c)
Battery is below 40% state of charge
44.
BATT LOW CHARGE caution means, that ______________
a)
SLAB battery is below 23 VDC, or
Ni-Cad battery is below 40% charge
b)
SLAB battery is below 40% state of charge, or
Ni-Cad battery is below 23 VDC
c)
SLAB battery only is below 23 VDC
45.
BATTERY FAULT caution means:
a)
SLAB battery is not connected
b)
Ni-Cad battery is overheating
c)
Ni-Cad battery is low on voltage
46.
Charger/Analyzer is __________________________
a)
only installed when the SLAB battery is used
b)
only installed when the Ni-Cad batttery is used
c)
powered by #1 DC primary bus
47.
Charger/Analyzer is __________________________
a)
disengages the DC essential bus when the battery capacity drops below 23 VDC
b)
disengages the DC essential bus when the Ni-Cad battery capacity drops below 35%
c)
receives power from the #1 AC primary bus
48.
Battery Low sensing relay is installed with ________________
a)
Ni-Cad battery only
b)
both the Ni-Cad and SLAB battery
c)
SLAB battery only
49.
AC-to-DC converters are supplied power from _______________
a)
#1 and #2 AC primary buses
b)
#1 and #2 main generators
c)
AC essential bus
50.
Ni-Cad battery is charged by _______
a)
#1 electrical system
b)
#2 electrical system
c)
APU electrical system
51.
DC Essential bus receives power from ____________ under normal circumstances
a)
#1 DC primary bus
b)
#2 DC primary bus
c)
AC essential bus
52.
Converter(s) supply DC power ________________
a)
when switched ON
b)
anytime AC power is supplied to AC primary buses
c)
anytime the battery is ON
53.
The ____________________ bus normally supplies power to the battery bus
a)
#1 DC primary bus
b)
DC Essential bus
c)
#2 DC primary bus
54.
How are #1 and #2 DC primary buses isolated in case of excessive amperage draw?
a)
With a CB
b)
With a current limiter (fuse)
c)
They are not interconnected
55.
When is the battery utility bus energized?
a)
As soon as the batery bus gets power (and the Nicad battery is above 35% chrge)
b)
Anytime the battery is connected and the battery switch is ON
c)
Anytime the battery electrical connector is connected
56.
When is the battery bus energized?
a)
Anytime the battery electrical connector is connected
b)
As soon as the batery bus gets power (and the Nicad battery is above 35% chrge)
c)
Anytime the battery is connected and the battery switch is ON
57.
When is the DC essential bus energized?
a)
Anytime the battery electrical connector is connected
b)
Anytime the battery is connected and the battery switch is ON
c)
As soon as the batery bus gets power (and the Nicad battery is above 35% chrge)
58.
At what RRPM will main generators drop-off in flight?
a)
85-89% RRPM
b)
below 95% RRPM
c)
below 96% RRPM
59.
At what RRPM will main generators drop-off on ground?
a)
85-89% RRPM
b)
below 95% RRPM
c)
below 96% RRPM
60.
Which bus powers windshield anti-ice system - central panel?
a)
#1 AC primary bus
b)
AC essential bus
c)
#2 AC primary bus
61.
Does the APU generator have the capacity to power MR and TR de-ice systems at the same time?
a)
No, it does not have such capacity. Another generator must také over part of the MR + TR de-ice system's load and the rest of the aircraft AC load
b)
Yes, it does have such capacity and it is what is happening during single main generator failure (remaining main generator supplies all the rest of the aircraft systems with AC power)
c)
No, it does not have such a capacity. In case of single main generator failure the remaining main generator supplies power to the aircraft MR+TR de-ice systems while APU generator supplies powr to the rest of AC systems
62.
With DC power only, which engine can be started
a)
Any of the two engines
b)
#2 engine only
c)
#1 engine only
63.
Select correct statement:
a)
With DC power only, no instruments will be available in the cockpit
b)
With AC power only, no instruments will be available in the cockpit
c)
All engine related instruments are powered from DC Essential bus
64.
With DC power only, which fire fighting capability is LOST?
a)
#2 Engine
b)
#1 engine
c)
APU
65.
With DC power only, which fire extinguisher bottle receives electrical power?
a)
Reserve bottle only, one squib
b)
Main bottle only, both squibs
c)
Both bottles, one squib each
66.
Why is it impossible to fire the squib in the main fire extinguisher bottle with DC power only even though one squib is powered by the battery utility bus?
a)
Because arming logic requires #2 DC primary bus to supply power to arm the #2 engine firefighting capability
b)
Because arming logic requires #1 DC primary bus to supply power to arm the #2 engine firefighting capability
c)
Because both squibs in the main fire extinguisher bottle are powered by #2 DC primary bus
67.
Main generators will be brought online ____________________
a)
Immediately after the respective engine start sequence is completed
b)
Immediately after APU start
c)
When at least one engine is running with the PCL in FLY detent
68.
With no AC power, what engine instruments indications will be available to the crew?
a)
All engine indications
b)
No engine indications
c)
TGT only
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