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Bell 212 [For Training Purposes Only] > Electrical Power Systems > Flashcards

Electrical Power Systems Flashcards

1
Q

What is the primary type and source of electrical power in the Bell 212?

a. 24 VDC power from one battery.
b. 28 VDC power from one starter-generator
c. 28 VDC power from two starter-generators
d. 115 VAC power from two inverters

A

c. 28 VDC power from two starter-generators

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2
Q

Which electrical buses distribute DC power to the using circuits?

a. No1 and No2 main DC buses
b. No1 and No2 essential DC buses
c. No1 and No2 nonessential DC buses
d. All of the above

A

d. All of the above

No1 and No2 main DC buses
No1 and No2 essential DC buses
No1 and No2 nonessential DC buses

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3
Q

Which of the following methods is used to assist the pilot in identifying and separating electrical circuit breakers on the overhead console?

a. Separating No1 and No2 buses and system breakers
b. Bracketing circuit breakers under main headings
c. Marking bus dependency symbols around circuit breakers
d. All the above

A

a. Separating No1 and No2 buses and system breakers

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4
Q

What function do the BATTERY BUS switches provide?

a. To activate the battery bus relays
b. To connect the two batteries to the battery bus
c. To connect the battery bus to the emergency buses
d. To activate the bus control relays

A

a. To activate the battery bus relays

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5
Q

What is displayed on the DC voltmeters?
A. No. 1 and No. 2 generator output voltage
B. No. 1 and No. 2 main DC bus voltage
C. No. 1 and No. 2 emergency DC bus voltage
D. No. 1 and No. 2 essential DC bus voltage

A

D. No. 1 and No. 2 essential DC bus voltage

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6
Q

What is displayed on the AC voltmeters?
A. Voltage on the two AC emergency buses
B. Voltage on the No. 1 and No. 2 115-VAC buses
C. 115-volt output voltage of each inverter
D. 115- and 26.5-VAC bus control voltages

A

B. Voltage on the No. 1 and No. 2 115-VAC buses

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7
Q

What does the dual ammeter indicate?
A. The amperage load on each generator
B. No. 1 and No. 2 AC bus loads
C. The amperage load on No. 1 and No. 2 DC essential buses
D. The total amperage load of B and C above

A

A. The amperage load on each generator

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8
Q 
What is the maximum allowable difference, in amps, between ammeter indications during normal operation?
A. 10
B. 20
C. 40
D. None
A

B. 20

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9
Q

What does illumination of the BATTERY caution panel light indicate?
A. The battery has failed
B. Low battery voltage
C. Both BATTERY BUS switches are in the ON position
D. Both battery bus relays are in the same position

A

D. Both battery bus relays are in the same position

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10
Q 
What does illumination of the BATTERY TEMP caution panel light indicate?
A. The battery is in thermal runaway.
B. High battery temperature
C. A clogged battery ventilating system
D. The battery vent door is closed
A

B. High battery temperature

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11
Q

When will the nonessential buses be automatically powered?
A. Only when both generators are operating on line
B. When only one generator is operating on line
C. When both BATTERY BUS switches are on line
D. There is no automatic feature; they must be switched on.

A

A. Only when both generators are operating on line

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12
Q 
When starting both engines using external power, which BATTERY BUS switches must be on?
A. None
B. No. 1 Bus
C. No. 2 Bus
D. Both the No. 1 and No. 2 Bus
A

D. Both the No. 1 and No. 2 Bus

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13
Q

What does illumination of the EXTERNAL POWER caution panel light indicate?
A. External power is applied to the aircraft.
B. The external power relay has failed.
C. External power output exceeds 28 volts or 1000 amps.
D. The external power door is open.

A

D. The external power door is open.

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14
Q 
Below what battery voltage is the use of external power recommended?
A. 22
B. 20
C. 18
D. 15
A

B. 20

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15
Q 
What is the minimum recommended N1 rpm to be attained before turning a generator on?
A. 55%
B. 61%
C. 71%
D. 85%
A

C. 71%

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16
Q 
What types of electrical power are used for a generator-assisted start of the second engine?
A. Generator and external power
B. Generator and battery power
C. Generator and start capacitor power
D. Generator and inverter power
A

B. Generator and battery power

17
Q

When the second generator is switched ON, which switch or switches should automatically change position?
A. BATTERY BUS 1 switch
B. BATTERY BUS 1 and BATTERY BUS 2 switches
C. INV 3 switch
D. NONESS BUS switch

A

A. BATTERY BUS 1 switch

18
Q

Which of the following is not a function of the DC control unit?
A. Voltage regulation, load-sharing, and paralleling
B. Ground fault detection and line contacting
C. Overvoltage and undervoltage protection
D. Load-shedding in the event of dual generator failure

A

D. Load-shedding in the event of dual generator failure

19
Q

What does the illumination of a DC GENERATOR caution panel light indicate?
A. The starter portion of the generator is activated.
B. A generator over voltage or overheating condition
C. The generator relay is open and the generator is not on line.
D. The generator relay is open but the generator is on line.

A

C. The generator relay is open and the generator is not on line.

20
Q

What does illumination of a GEN OVHT caution panel light indicate?
A. The generator has an internal mechanical failure.
B. Generator voltage is excessive.
C. Generator load is excessive.
D. The generator cooling air is hot.

A

D. The generator cooling air is hot.

21
Q

What cockpit gage will provide a positive indication of DC essential bus failure?
A. Hydraulic temperature gage drops to 0.
B. Loadmeters indicate 0 load on one generator
C. The respective DC voltmeter drops to 0 volts.
D. One DC voltmeter indicates battery voltage.

A

C. The respective DC voltmeter drops to 0 volts.

22
Q

What is the source of AC electrical power on the Bell 212?
A. A single AC dynamotor driven by airframe DC power
B. Two or three solid-state inverters powered by airframe DC power
C. A transmission-driven inverter and a dynamotor
D. Two alternators driven by the N2 accessory section of each engine

A

B. Two or three solid-state inverters powered by airframe DC power

23
Q

What does illumination of an INVERTER caution panel light indicate?
A. Loss of 115-volt inverter output
B. The inverter has been dropped offline
C. Only the AC emergency buses will be powered
D. Loss of the No. 3 115-VAC bus

A

A. Loss of 115-volt inverter output

24
Q 
Which AC electrical buses are lost if one inverter fails?
A. The No. 3 AC bus
B. The respective AC emergency buses
C. The nonessential AC buses
D. No AC buses are lost.
A

D. No AC buses are lost.

25
Q

What are the starter limitations?
A. 60 seconds on, 30 seconds off, 60 seconds on, 15 minutes off
B. 30 seconds on, 5 minutes off, 60 seconds on, 15 minutes off
C. 30 seconds on, 60 seconds off, 30 seconds on, 5 minutes off, 30 seconds on, 15 minutes off
D. 60 seconds on, 30 seconds off, 60 seconds on, 5 minutes off, 60 seconds on, 15 minutes off

A

C. 30 seconds on, 60 seconds off, 30 seconds on, 5 minutes off, 30 seconds on, 15 minutes off

Bell 212 [For Training Purposes Only] (13 decks)

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