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RG- M11 Practice Questions > 11.6 Electrical Power > Flashcards

11.6 Electrical Power Flashcards

1
Q

WHAT COULD CAUSE AND INCREASE OF THE OIL AND A DECREASE OF THE OIL RISE TEMPERATURE?

A

COOLING IS NOT SUFFICIENT

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2
Q

WHAT HAPPENS WHEN THE DISCONNECT SOLDENIOD IS ENERGISED WHILE THE ENGINE IS STOPPED?

A

THE DDISCONNECT DEVICE IS TRIGGERED AND THE CLUTCH IS DAMAGED WHEN THE ENGINE IS STARTED

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3
Q

HOW IS A CSD DISCONNECT RESET PERFORMED?

A

THE RESET RING IS PULLED WHEN THE ENGINE IS COMPLETELY STOPPED

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4
Q

WHAT IS THE FUNCTION OF THE VOLTAGE REGULATOR IN THE GCU?

A

TO CONTROL THE VOLTAGE AT THE POINT OF REGULATION 115V BY INFLUENCING THE ECCITER CURRENT

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5
Q

WHICH IS THE VOLTAGE FOR AN UNDERVOLTAGE CONDIDITON?

A

100 VOLTS

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6
Q

WHAT HAPPENS WITH A GENERATOR WORKING IN ISOLATED CONDITION WHEN IT RECIEVES MORE EXCITER CURRENT THAN NECESSARY?

A

VOLTAGE WILL INCREASE

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7
Q

WHEN DOES THE DIFFERENTIAL PROTECTION CIRCUIT TRIP THE GENERATOR?

A

WHEN THE CURRENT IN 1 PHASE DIFFERS

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8
Q

WHEN THE CURRENT IN 1 PHASE DIFFERS
WHAT HAPPENS WHEN YOU EXCHANGE TWO PHASE CONNECTIONS AT THE GENERATORS TERMINALS?

A

RUNS IN REVERSE

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9
Q

HOW CAN YOU CHECK THE CHARGE LEVEL OF A NI-CAD BATTERY?

A

YOU MUST MEASURE THE CHARGE CURRENT, IF IT IS NEARLY ZERO THE BATTERY IS FULLY CHARGED

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10
Q

WHAT HAPPENS WHEN NI-CAD BATTERY OVERHEATS DUREING CHARGE?

A

THERMAL RUNAWAY

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11
Q

WHICH OF THE FOLLOWING METHODS IS USED TO CHARGE A BATTERY IN AN ELECTICAL POWER SYSTEM?

A

THE BATTERIES CAN BE CHARGED BY A TR UNIT USING THE CONSTANT VOLTAGE CHARGNG METHOD.

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12
Q

CONSDIER A TWO ENGINED A/C WITH A ISOLATED ORINTATION OF THE MAIN BUS BAR, WHAT HAPPENDS IN THE EVENT OF A FILURE OF ONE OF THE MAIN ENGINE GENERATORS IN FLIGHT?

A

THE REMAINING ENGINE GENERATOR SUPPLIES THE MIAN AC BUS BAR ON THE FAILED SIDE VIA THE BUS TIE BREAKERS AND THE GALLEY LOADS ARE SHED.

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13
Q

CONSIDER A MULTI ENGINE AIRCRAFT WITH PARALLELD GENERATORS. WHAT HAPPENS IF THE NUMBER TWO BUS-TIE CONTACTOR IS OPENED?

A

GENERTAOR ONE, THREE AND POUR SUPPLY MAIN BUS BAR ONE. THREE AND FOUR IN PARALLEL AND GENERATOR TWO POWERS MAIN BUS IWU SEPERATELY.

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14
Q

HOW IS AN OPEN-PHASE IN A GENERATOR DETECTED?

A

BY COMPAIRING THR GENERATOR LOAD IN EACH PHASE

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15
Q

WHAT DOES IT MEAN WHEN A AVALI LIGHT IN THE EXTERNAL POWER PUSH BUTTION ILLUMINATES.

A

THE EXTERNAL POWER SOURCE THAT IS CONNECTED PROVIDES ELECTRICAL POWER WITH THE CORRECT PARAMETERS.

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16
Q

WHAT HAPPENS WHEN YOU SWITCH ON EXT PWR IN AN ELECTRICAL POWER SYSTEM?

A

THE EXT PWR SOURCE IS ACTIVATED TO SUPPLY THE NETWORK THE GND SERVICE MUST BE SWITCHED TO.

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17
Q

HOW ARE THE ENGINE DRIVEN GENERATORS OF MULTI ENGINED AIRCRAFT (3 OR 4 ENGINES) USUALLY OPERATED?

A

IN PARALLEL OPERATION.

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18
Q

HOW MANY RESETS ARE PERMITTED AFTER A CIRCUIT BREAKER HAS TRIPPED?

A

ONE, TO PREVENT CONTACTS FROM WELDING IF A SHORT CIRCUIT HAS OCCURRED.

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19
Q

WHAT DOES THE ABBREVIATION RCCB MEAN?

A

REMOTE CONTROL CIRCUIT BREAKER,

20
Q

WHICH IS THE PRINCIPLE OF OPERATION OF THE CSD DISCONNECT?

A

ELECTRONICALLY DISCONNECTED AND MECHANICALLY RE CONNECTED.

21
Q

WHICH IS THE MAXIMUM PERMITTED TIME FOR OPERATING A CSD DISCONNECT BUTTION?

A

THREE SECONDS.

22
Q

WHICH PROTECTIVE FUNCTIONS ARE BUILT INTO THE AIRCRAFTS TRANSFORMER RECTIFIER (TR) UNITS?

A

LOW CURRENT AND HIGH TEMPERATURE PROTECTION.

23
Q

WHAT ARE THERE TWO SHORT PINS IN THER EXTERNAL POWER RECEPTICLE?

A

THEY ENSURE THAT THE EXTERNAL POWER CAN ONLY BE APPLIED IF THE PLUG IS LOCTAED CORRECTLY IN THE POWER RECEPTICLE

24
Q

WHAT ARE THE SAFETY CONCERNS ASSOCIATED WITH SYNTHEIC HYDRALIC FLUID?

A

THE FLUID SHOULD BE KEPT AWAY FROM PLASTIC COMPONENTS AND CONTACT WITH SKIN AND EYES SHOULD BE AVIODED.

25
Q

SOME OF THE HYD FLUID FROM THE PUMP IS USED FOR COOLING AND LUBE OF THE PUMP ITSELF. WHERE DOES HE COOLING FLUID GO AFTERWARDS?

A

IT GOES TO THE CASE DRAIN.

26
Q

SOME HYDRAULIC PUMPS ARE DRIVEN BY ELECTRIC MOTORS. HOW ARE THESE MOTORS KEPT COOL?

A

BY THE HYDRAULIC FLUID

27
Q

WHICH OF THE FOLLWING IS MOST LIKELY TO PROVIDE AN AIRCRAFTS MAIN HYDRAULIC PRESSURISATIONS?

A

ENGINE DRIVEN PUMPS

28
Q

IS IT POSSIBLE TO MIX DIFFERENT HYDRAULIC FLUID TOGTHER?

A

SYNTHETIC FLUIDS CAN BE MIXED WITH EACH OTHER BUT NOT WITH MINERIAL OILS.

29
Q

WHAT IS A STAIC SEAL?

A

A SEAL THAT IS DESIGNED TO WITHSTAND STEADY PRESSURE LOADS ONLY.

30
Q

HOW CAN THE CONTENTS OF THE HYDRAULIC RESEVOIR BE VERIFIED?

A

ON ECAM/EICAS AND ON A DIRECT READING GAUGE ON THE RESEVIOR

31
Q

WHAT IS THE PURPOSE OF A HYDRAULIC POWER TRANSFER UNIT (PTU)?

A

TO TRANSFER POWER FROM ONE HYDRAULIC SYSTEM TO ANOTHER BY USING A MOTOR AND PUMP ARRANGEMENT.

32
Q

HOW IS AN AIR DRIVEN HYDRAULIC PUMP POWERED?

A

VIA A GEARBOX BY A PNEUMATIC SYSTEM AIR,

33
Q

WHAT IS THE PURPOSE OF A HYDRAULIC ACCUMILIATOR?

A

TO SMOOTH OUT THE PRESSURE FLUCTUATIONS IN THE SYSTEM AMD TO PROVIDE AN INSTANT SOURCE OF HYDRAULIC POWER.

34
Q

WHICH IS THE MAIN DISADVANTAGE OF SYNTHETIC HYDRAULIC FLUIDS WHEN COMPARED TO MINERIAL OILS?

A

THEY ABSORB WATER

35
Q

HOW CAN HE CSD DISCONNECT BE RELIABLY CONFIRMED?

A

ZERO VOLTS AND ZERO FREQUENCY IS INDICATED.

36
Q

WHICH ARE THE MAIN COMPONENTS OF A STATIC INVERTER?

A

SOLID STATE SWITCHES AND A TRANSFORMER.

37
Q

WHAT HAPPENS IF THE BUS TIE SWITCHING IS SET TO OFF DURING OPERATION WITH ONLY GROUND POWER AVALIABLE?

A

THE POWER TO MAIN BUS BAR IS LOST

38
Q

WHAT IS THE MAIN ADVANTAGE OF PARALLEL OPERATION OF THE MAIN AC BUSES OVER ISOLATED OPERATION?

A

ALL ENGINE DRIVEN GENERATORS ARE EOADED EQUALLY AND THERE IS NO POWER LOSS WHEN ONE GENERATOR FAILS.

39
Q

WHY ARE TRIP-FREE CIRCUIT BREAKERS(CB’C) USED ON AIRCRAFT?

A

BECAUSE THE CAN OPEN AN OVERLOADED CIRCUIT EVEN WITH THE CONTROL KNOB JAMMED IN.

40
Q

WHICH STATEMENT ACCURATELY DESCRIBES THE BUS-TIE SWITCHING OPERATION IN A BOEING MULTI ENGINED AIRCRAFT?

A

THE BUS-TIE SWITCHING IS NORMALLY CLOSED. THIS IS KNOWN AS PARALLEL OPERATION.

41
Q

CONSIDER THE FUNCTION OF A GCU. WHICH OF THE FOLLOWING STSEMENTS ARE CORRECT?

A

THE GCUS OF THE ENGINE DRIVEN GENERATORS ARE IDENTICAL AND INTERCHANGEABLE.

42
Q

HOW ARE THE ENGINE DRIVEN GENERATORS OF A TWIN ENGINED AIRCRAFT USUALLY OPERATED?

A

IN ISOLATED OPERATION,

43
Q

“WHAT IS THE PURPOSE OF THE TWO MINUTE DELAY BEFORE RESETTING A CIRCUIT BREAKER?

A

TO ALLOW HE BI-METAL STRIP IN THE CIRCUIT BREAKER TO COOL DOWN.

44
Q

WHICH STSTEMENT IS CORRECT CONCERNING THE INPUT SPEED OF THE GENERATORS PRODUCING A VOLTAGE WITH A FREQUENCY OF 400H2?

A

THE SPEED DEPENDS ON THE AMOUNT OF POLEPAIRS, 24000RPM WITH ONE PPOLEPAIR AND 8000 RPM WITH THREE POLE PAIRS.

45
Q

HOW DOES THE STATIC INVERTER GENERATE THE CORRECT OUTPUT FREQUENCY?

A

WITH A BEAT GENERATOR.

46
Q

WHICH STATEMENT IS CORRECT CONCERNING THE FUNCTIONS OF A CIRCUIT BREAKER (CB)?

A

THE CB TRIPS WHEN THE NORMAL CURRENT IS EXCEEDED FOR A CERTAIN TIME EVEN IF THE CONTROL KNOB IS PRESSED.

RG- M11 Practice Questions (22 decks)

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