PRACTICAL AIRCRAFT SYSTEMS – Air – DGCA Question Bank For Politics

#1. The purpose of a synchronising bus bar is to:

enable interconnections to be made between generator bus bars.

supply essential services.

monitor on-load currents.

interconnect DC bus bars.

#2. Fuses and circuit breakers are fitted:

in DC circuits only.

in both AC and DC circuits.

in AC circuits only.

only to protect the wiring.

#3. Where the aircraft’s main electrical supply is A.C, DC requirements are met by:

batteries.

T.R.U.s.

inverters.

a static inverter.

#4. In a split bus system using non-paralleled constant frequency alternators as the primary power source:

essential AC loads are supplied directly from Nº 1 AC bus bar.

essential AC loads are supplied directly from Nº 2 AC bus bar.

only non-essential AC loads are supplied from the AC bus bars.

essential AC loads are normally supplied from Nº 1 AC bus bar via the changeover relay.

#5. In a split bus system using non-paralleled constant frequency alternators as the primary power source, if both alternators fail:

all non-essential services are lost.

all non- essential services will be supplied direct from the battery bus bar.

all non-essential services will be supplied from the static inverter.

essential DC consumers only will be supplied from the Nº1 T.R.U., all other DC services will be lost.

#6. In normal operation, the split bus bar AC system takes its DC supply from:

two T.R.U.s which are always isolated.

a battery which is supplied from Nº 1 T.R.U. only.

two T.R.U.s which are connected together by the isolation relay.

the static inverter.

#7. The static inverter in the split bus system supplies:

the essential DC consumers.

the essential AC consumers.

both essential and non-essential consumers.

the batteries.

#8. In the split bus system, the AC bus bars:

are automatically connected via the isolation relay if one alternator fails.

are automatically connected via the bus tie breaker if one alternator fails.

can be connected together by switch selection if one alternator fails.

can never be connected together because there is no load sharing circuit.

#9. With parallel generator operation:

there are two synchronising bus bars which are normally kept isolated.

the G.C.B.s connect the generators to the synchronising bus bar.

the B.T.B.s connect the synchronising bus bars together.

the G.C.R.s connect the generators to their load bus bars.

#10. In a parallel alternator operation, should one alternator fail, then:

the other alternators can be selected to supply its load.

the failed alternators loads will not be supplied.

the G.C.B. of the failed alternator will remain closed to allow its loads to be supplied by the remaining alternators.

the S.S.B. will close allowing the three remaining alternators to share all of the load.

#11. If external power is plugged into an aircraft which utilises the split bus system of power distribution, then:

it will automatically parallel itself with any alternators already on line.

it will only supply non-essential AC consumers.

it will supply all the aircraft services.

essential AC consumers will be supplied from the static inverter.

Dgca Question Bank For Pilots

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