Module 11 - part 1

To prevent gimbal lock on the stable platform it is normal to use. three gimbals. four gimbals. a pitch gimbal.

When the inertial platform is torqued to perform like a Schuler pendulum. the platform rotates with respect to the aircraft. the platform remains fixed with respect to the local vertical. the platform oscillates with respect to the local vertical.

A Schuler pendulum has a period of oscillation of. 84.4 seconds. 8.4 minutes. 84.4 minutes.

An IN system requires data from the. Doppler system. airdata computer. satellites.

When in manual mode, the C.D.U. alert lamp of the IN system will flash. thirty seconds before a track change is required. when an error is detected. two minutes before the next waypoint.

XTK (cross track) is the. angle in degrees that aircraft track is left or right of desired track. perpendicular distance from the desired track. actual track across the earth's surface.

The output of an INS can be fed to. attitude indicators. altimeters. vertical speed indicators.

The three accelerometers on a strapdown platform are mounted. 90º to each other. parallel to each other. 120º apart.

A basic I.N.S. platform has. 3 axis accelerometer. 3 accelerometers and 2 gyros (pitch and roll). 2 accelerometers and 3 gyros.

Using I.N.S. an aircraft flies. great circle arc. rhumb line. course directed by ground station.

What must be entered in to the I.N.S. before the aircraft moves?. Waypoints. E.T.A. Present position.

Selection of the INS Mode Selector Unit (MSU) to ATT REF is made. to feed information to the Captain and 1st Officers ADI displays. when attitude information is lost. when navigation information is lost.

For the INS, the Battery Unit provides. standby power when airborne, switched by weight-off switches in the undercarriage. both when airborne and on the ground. standby power only when on the ground, to maintain the alignment phase.

Control Display Unit (CDU) selection of TKE displays. distance perpendicular from the selected track. difference in degrees that the aircraft track is to the right or left of the desired track. difference in degrees from True North in a clockwise direction from the desired track.

The Earth Rate Compensation for an INU is computed from. the earth's rotational rate (15°/hour) times the sine of the longitude. the earth's rotational rate (15°/hour) times the cosine of the latitude. the earth's rotational rate (15°/hour) times the sine of the latitude.

INS wind speed is calculated from. the vectorial addition of IAS and TAS. the vectorial addition of TAS and GS. the vectorial addition of IAS and GS.

Centripetal error compensation is achieved by. allowing the platform to oscillate at a fixed rate. an additional signal is added to the N/S accelerometer to cancel the centripetal error. the platform is torqued to align the N/S accelerometer along its insensitive axis.

Transport Rate compensation is achieved by. an additional signal added to the N/S accelerometer output depending on heading. allowing the platform to oscillate at a fixed rate. the platform being torqued by a computed torquing signal.

If the battery fails on the ground (INS System). an amber light appears on the MSU and a horn sounds. a red warning light appears on the MSU and a horn sounds. a red light appears on the CDU and a horn sounds.

An IRS alignment. takes 10 minutes and present position must be entered before alignment. takes 10 minutes and present position can be entered any time during the alignment. takes 10 minutes and the previous flight shut down present position is used for the alignment.

For an IRS system to pass the 'Alignment System Performance Test' the. the No. 1 and No.2 must both have the same latitude and longitude present position entered. entered present latitude and longitude must agree with the latitude and longitude at the last power own. latitude entered must be within given limits of the latitude computed by IRU.

A laser gyro dither mechanism ensures that. the contra-rotating beams are synchronised together. optical 'backscatter' does not cause the contra-rotating beams to lock together. that the two contra-rotating beams each operate at different frequencies.

The localiser deviation signal for the flight director comes from the. flight director computer. VHF comm system. VHF nav system.

The heading error signal used in the heading select mode. is the difference between the desired heading and the actual heading. is the difference between the desired course and the actual course. comes direct from the compass system.

The crab angle of the aircraft during VOR or LOC modes is displayed by the. difference between the course arrow and aircraft heading. difference between the selected heading and aircraft heading. selected course counter.

VOR left-right deviation signals come from the. DME system. VLF nav system. VHF nav set.

Above the glideslope, the ILS glideslope signal modulation is. 90 Hz. 150 Hz. 90 KHZ.

The localiser modulation signal to the left of the localiser centre line, as seen from the localiser transmitter, is. 90 Hz. 90 KHz. 150 Hz.

The correct sense demand generated for a selected heading 180°, when the aircraft heading is 150° is. turn left. straight ahead. turn right.

When an aircraft is flying along the extended centre line of the runway it is in the. 150 Hz modulation sector. 90 Hz modulation sector. equi-signal sector.

The localiser system offers approach guidance to the runway in terms of. the vertical plane. the horizontal plane. distance to touch down.

The glideslope transmitter is located. at the end opposite to the approach end of the runway. adjacent to the touch-down point of the runway. at the approach end of the runway.

The glideslope and localiser frequencies. are fixed and common to all runways therefore frequency selection is not necessary. have to be selected separately. are paired and one frequency selector suffices for both.

The glideslope system offers approach guidance to runways in terms of. distance to touchdown. the vertical plane. the horizontal plane.

The glideslope equipment operates in the. VHF band. UHF band. HF band.

The localiser equipment operates in the. HF band. VHF band. UHF band.

The aircraft equipment determines the bearing of a ground station by comparing. the amplitude of two 30 Hz modulations. the phase of two 30 Hz modulations. the phase of one 30 Hz modulation with that of a 9960 Hz modulation.

The number of different radials provided by a ground station is. infinite. 180 per quadrant, i.e. 720 in 360°. 360.

Which of the following frequencies is allocated to VOR?. 114.3 MHz. 127.2 MHz. 103.9 MHz.

Aerial masts may be damaged by. water. killfrost anti-icing fluid. Skydrol hydraulic fluids.

Most radio aerial masts are. not bonded. bonded. insulated from the fuselage.

When an aircraft is heading due north (magnetic) towards a VOR station the reference and variable signals will be. 270° out of phase. in phase. 180° out of phase.

The middle marker modulation is keyed with. alternate dots and dashes. dashes. dots.

The modulation of the outer marker is. 3000 Hz. 400 Hz. 1300 Hz.

The approximate distance of the middle marker from the runway threshold is. 7 miles. 3 miles. 3500 ft..

Marker information is usually provided to the pilot. aurally. both visually and aurally. visually.

An over station sensor (OSS) detects. the rapid rate of the VOR signal over the cone of confusion. radio deviation signals proportional to distance from a localiser transmitter. radio deviation signals proportional to distance from a VOR transmitter.

Incompatible Flight Director modes are. altitude hold and ILS. VRU and compass. VOR and glidepath.

The VOR system comprises. reference phase signal. variable and reference phase signals. variable phase signal.

The most sensitive system between ILS and VOR is. they both have the same sensitivity. ILS. VOR.

If an aircraft is flying on a heading of 000 away from a VOR station, the TO/FROM indicator would show. to. from. no indication.

How does the flight director computer differentiate between VOR and ILS frequencies?. Frequency discriminator in receiver. Trigger pulse from ground station. Discriminator on control panel.

The glideslope transmitter operates on. the VHF band. frequencies of 108 to 118 MHZ. the UHF band.

The pilots instinctive autopilot disengage button is on the. left of the control column. right of the control column. side of the controls away from the throttles.

If the autopilot automatically disconnects in the autoland mode, the audible warning. switches off after a time interval. is switched off by the instinctive cut-out button. can only be switched off by re-engaging the autopilot.

A category 3B aircraft using fail operational automatic landing equipment will have. a decision height depending on RVR. a decision height of 50ft. no decision height.

For an aircraft to be certified for automatic landing, an autothrottle system is. mandatory. a matter of choice for the operator. dependent on the operation of the aircraft at slow speeds.

With autothrottle engaged, the application of reverse thrust will. drive the throttles to the minimum thrust position. drive the throttles to the reverse thrust position. disconnect the autothrottle.

During ATC transponder operation, side lobe suppression acts to. mute the DME operation during transmit phase. mute coms transmission during transponder operation. supply altitude readout.

During operation of a twin HF radio system transceiver. #1 HF system operation is inhibited during #2 operation. both systems can be operated simultaneously. #1 HF system can transmit but not receive.

Which L band frequency is not used by DME for transmitting?. 2210 MHz. 1090 MHz. 4133 MHz.

Function of ADF & VOR and DME in navigation system with reference to aircraft and beacon is;. the first provides distance between aircraft and beacon and latter provides bearing line from aircraft to beacon. the first provides bearing line from aircraft to beacon and latter provides distance between aircraft and beacon. None of above.

Which two frequencies are paired?. Which two frequencies are paired?. Glideslope and localizer. Localizer and DME.

Localizer beam width is the angle where the two edges of beam are apart at the runway threshold by. 7 ft. 700 ft. 70 ft.

What happens if frequency decreases without altering the physical length of aerial?. The aerial becomes inductively capacitive. The aerial becomes capacitively reactive. The aerial becomes inductively reactive.

What happens if frequency increases without altering the physical length of aerial?. The aerial becomes inductively reactive. The aerial becomes capacitively reactive. The aerial becomes inductively capacitive.

Aerials provide optimum output at one particular frequency, when its load is purely. resistive. capacitive. inductive.

The torque pre-set in an autopilot system is. to stop the motor overheating. to give control surface feel. to allow it to be overridden at a certain force.

Most aerials are. not bonded. bonded. made from non-conductive material.

The Middle Marker beacon is what colour?. Amber. White. Blue.

Laser gyros have. no rotating parts. moving parts. a spinning rotor.

Laser gyros are aligned to. magnetic north. true north. aircraft structure.

Triplex autopilot is. fail passive. fail soft. fail operational.

Flight management control system (FMCS) utilises. ILS, VOR, ADF. ILS, DME, ADC,. VOR, ADF, DME.

ACARS is. a navigation system. a satellite communication system. a way of reporting defects to maintenance base in flight.

Where is an ATC transponder mode 'A' selected ON?. The airspeed indicator. The ATC control panel. The altimeter.

How many data bases are required in an FMS system?. 2. 1. 3 (one is used for redundancy).

What channel of the autopilot does the glideslope control?. Pitch. Yaw. Roll.

What is secondary radar?. Signal returned from a transponder. A backup radar on an airfield. Reflected radar bounce from an aircraft.

In an autothrottle system, when is EPR or thrust mode used?. Approach. Cruise. Take-off.

What is Mode 1 & 2 of GPWS used for?. Excessive descent rate, unsafe terrain clearance. Excessive descent rate, excessive terrain closure rate. Excessive terrain closure rate, altitude loss after take-off.

For radio communication over a distance of over 250 miles we use. VHF. VLF. HF.

Autopilot, when on approach to landing, how many axis are used?. 3. 2. 1.

A lead-acid battery is considered to be fully charged when the. cells begin to gas freely. SG reaches 1.180. SG and voltage remain constant for specified period.

A diode across a contactor. reduces contact bounce. enables it to be connected to either an AC or DC circuit. reduces contact arcing.

The preferred method of battery charging a Ni-Cad battery is constant. voltage. power. current.

A battery in situ on an aircraft. charges at a fairly constant rate because generator voltage remains constant. may charged at an excessive rate if initial battery voltage is low. may charge slowly if initial battery voltage is low.

To parallel an alternating current generator with one or more other generators, phase A must be. 90 degrees out-of-phase and ABC. in-phase with other generators and CBA only. in-phase with other generators and ABC.

On an unparalleled twin generator alternating current system, the phase of the second generator to be brought on line. must be in-phase prior to paralleling. is unimportant. is important if the first generator fails.

The power supply for aircraft is. 28VDC, 115VAC, 400Hz. 28VDC, 220VAC, 400Hz. 28VDC, 115VAC, 200Hz.

On a Direct Current circuit, Current Limiters. prevent overheating by limiting current to load. limit generator field excitation. limit current to field circuit.

On a direct current circuit, current limiters. allow excessive current to the load circuit. prevent excessive current to the load circuit. prevent excessive current to the field circuit.

When a current transformer is disconnected from its load. a resistor should be placed across the terminals. the terminals should be shorted together. the terminals should be left disconnected.

Ram Air Turbines have variable fan blades to. maintain a constant speed. provide a constant flow rate. produce maximun hydraulic pressure required by the system.

On a direct current twin generator system, the paralleling relay contacts close when the oncoming generators voltage is. below bus voltage. the same as bus voltage. above bus voltage.

Where is a commutator found?. An AC generator. A DC generator. A DC alternator.

Calculate the battery terminal voltage of a NiCad battery with 15 cells. 18 V. 15 V. 30 V.

Reactive electrical loads are adjusted by. adjustment of generator speed. adjustment of the regulator output. varying the frequency circuit.

IDG oil is used for. internal hydraulic functions only. cooling, lubrication and internal hydraulic functions. cooling and lubrication only.

A silver oxide cell has a voltage of. 1.55 V. 1.8 V. 1.2 V.

Lithium cells. are very efficient. have an unlimited re-charge cycle capacity. are not rechargeable.

On a split bus electrical system, the bus tie breakers are. always closed in flight. always open in flight. only closed in an emergency.

Parallel electrical system bus tie breakers are. closed in flight and open on ground. closed on ground and open in flight. always closed in flight.

Whilst synchronising generators, frequency bias is adjusted on. the on-line generator. all generators. the on-coming generator.

The GCR will trip during over-voltage. based upon a fixed time delay circuit. based upon the amplitude of the over-voltage. immediately.

In a constant voltage AC generator, the voltage is regulated by. a 3-phase transformer. varying field voltage. varying field current.

A vibrator type voltage regulator regulates field current by. just a pair of contact breaker points. a resistor in parallel with a pair of contact breaker points. a resistor in series with a pair of contact breaker points.

When a current transformer is disconnected, what should be done?. Resistor placed across terminals. Left open circuit. Terminals shorted.

What does the differential sensing coil sense?. Volts. Power. Current.

Where does the GCU gets its power?. RAT. PMG. Battery.

Galley loads are wired in. either series or parallel depending on the design. series. parallel so load shedding will lower current consumption.

In a merz-price protection system of a single phase, if, when a fault occurs, only one relay contactor opens,. only the relay on the side which has the fault will energise. then it is probable that one of the relays has failed short circuit. then it is probable that one of the coils has failed open circuit.

A fuse-type current limiter. can be used as a radio suppressor. limits current flow to a load. opens a circuit after a time/current condition has been exceeded.

When a load is shed from a busbar, the. busbar voltage decreases. current consumption from the bar decreases. busbar voltage increases.

In unparalleled AC generation systems, the phase rotation of one generator in relation to the others. must be synchronised prior to paralleling. is unimportant. must be BCA.

In a multi-generator system, the generator which takes more than its reactive power share is protected by. over-current and under-current protection circuits. over-excitation and under-excitation protection circuits. over-voltage and under-voltage protection circuits.

In a pulsed width modulating type voltage regulator, the generator output voltage is increased by. increasing the voltage sensed by the voltage regulator. increasing the mark to space ratio. decreasing the mark to space ratio.

Sharing of electrical loads by paralleled DC generators is controlled by. automatic load shedding. equalising circuits which control the field excitation of the generators. equalising circuits which control the speed of the generators.

Excessive commutator sparking can be caused by. rotating field diode failure. weak spring tension. brushes positioned on MNA.

Before checking the SG of a battery recently removed from an aircraft. take the temperature of the electrolyte. carry out a capacity test. allow to stabilise for one hour.

On an AC external power plug, the interlock circuit is controlled by pins. E and F. A and B. C and D.

Over-voltage protection circuits are activated. after a fixed time delay. dependent on the magnitude of the overvoltage. before the over voltage limit is exceeded.

A diode connected across a coil will. prevent the coil being fitted the wrong way. prevent back EMF and allow faster switching. suppress arcing when relay is opening and closing.

Which fault does not always trip the GCR?. Over-frequency and under-frequency. Under-frequency and under-volts. Over-frequency and over-volts.

Differential protection in a generating system. detects current difference between source and load. uses the volts coil to trip the GCR. detects voltage difference between source and load.

Open phase sensing on a current transformer. is detected on generator neutral circuit. is detected using all phases. is detected using any phase.

If the battery is switched off in flight, the. battery is disconnected from bus. captain's instruments will be powered from the standby bus. generator voltage falls to zero.

To flash a generator field the. generator is on line and producing a voltage less than the flashing voltage. generator must be stationary. generator rotates but is not on line.

Voltage is controlled by. the voltage regulator. the constant speed drive. the swashplate.

Distilled water should be added to a ni-cad battery. only in the battery workshop. when fully charged. at any time.

Overflowing electrolyte in a ni-cad battery indicates. not enough charging current. low electrolyte temperature. excessive charging current.

During a normal engine shutdown, generator tripping is initiated by. underfrequency. undervoltage. overcurrent.

What would you use to neutralise nicad battery spillage?. Boric acid. Distilled water. Bicarbonate of soda.

Before operating generators in parallel, their voltages should be matched to prevent. overloading the generator drive and shearing of splines. voltage spikes of sufficient magnitude to trigger GCU overvoltage circuits. large circulating currents developing.

Consumer loads are connected to a busbar. in series so when loads are shed voltage is reduced. in series so when loads are shed current is reduced. in parallel so when loads are shed current is reduced.

A current transformer connected on the neutral star point of a generator is for. overload protection. differential current protection. negative sequence protection.

Differential protection as applied to AC generation systems compares. ambient pressure to cabin pressure. generator voltage to busbar voltage. generator current to busbar current.

In an AC generation system, the frequency and phase rotation. is of no consequence after paralleling. must be synchronised prior to paralleling. must be out of phase prior to paralleling.

Diodes are placed across a contactor to. prevent contact bounce. ensure smooth contactor operation. speed up operation by reducing back EMF.

Placing the battery master switch to off during flight will. shut down the APU. isolate the battery from the main busbar. disconnect all power to the main busbar.

Whilst operating paralleled AC constant frequency generators, it is important to maintain generator outputs at the same voltage. to prevent a circulating current of considerable magnitude developing between two or more generators. to prevent a circulating current developing between two or more TRUs. to prevent CSD shock loading.

A voltage regulator installed in series with a generator field. uses a current coil in parallel with generator output. uses a voltage coil in parallel with generator output. uses a voltage coil in series with generator output.

CSD warning lights on the flight deck normally indicate. low oil pressure, low oil temperature. high oil pressure, low oil temperature. low oil pressure, high oil temperature.

The output frequency of a hydraulically driven standby generator is controlled by. an IDG. a CSD. an hydraulically actuated swash plate.

An AC generator used with a CSD. does not need a voltage controller because current is kept constant. does not need a voltage controller because voltage is kept constant. needs a voltage controller to maintain voltage with increasing load.

Power to a GCU is supplied. initially by a 'field tickling' supply and then PMG output. by the battery bus or rectified generator output. by the generator output only.

Trip signals for a GCR are. underfrequency and overcurrent. overfrequency and undervoltage. differential protection and undervoltage.

Abnormal CSD operation is monitored on the flight deck by observing indications of. high oil temperature / low oil pressure. low oil quantity / low oil temperature. High oil temperature / low oil quantity.

Wires in hot temperature areas should be bound with. PVC. Teflon. Nomex.

A heat gun should be operated at. 100°C below the specified. the specified temperature. 100°C above the specified.

High voltages on a generator in a parallel system should be prevented because. it will cause high circulating current in the bus / other generators. it will damage the drive shaft. it will trip the GCR.

Over-voltage condition trips the generator. The time taken to trip the GCU depends on. time delay circuit. closing of fuel and hydraulic valves. amplitude of voltage.

Speed of an HMG is controlled by a. ID unit. CSD unit. swashplate.

A permanent magnet should have. high retentivity, low coercivity. low retentivity, high coercivity. low retentivity, low coercivity.

What will happen if the aircraft battery becomes overheated?. The power supply to the battery charger will be interrupted. The hot battery bus will be disconnected from the battery. The battery charger will switch to trickle charge mode.

When the temperature increases in a lead acid battery, the SG will. increase. decrease. remain the same.

On testing a generator it is found to require adjusting, where would you adjust it?. By means of a remote trimmer. On the GCU. In the cockpit on the flight engineers panel.

Control of hydraulically powered emergency electrical generator frequency is. by angle of swash plate. by IDG. by CSU.

When a ni-cad battery is fully charged. the electrolyte level is lower than normal. the electrolyte level is higher level than normal. the electrolyte level stays the same.

Electrical load on aircraft is controlled by. a GCU. a BPCU. an IRS.

A 4:1 step-up transformer receives 120VAC in its primary and has 1600 Ohms resistance in its secondary. What is the current drawn from the source?. 3 A. 1.2 A. 0.3 A.

After engine start using a Ni-Cad battery, the pilot observes on the battery charger indicator, an initial high current draw followed by a rapid decrease in current. no cause for concern. the battery is faulty. there is a problem with the charging circuit and he must shut-down the engines.

In a lead-acid battery after numerous checks, one cell has low reading. It is defective. It must be replaced. It needs topping up.

A short range passenger aircraft has complete electrical failure. What time duration would the battery be expected to power essential equipment?. 60 minutes. Forever. 30 minute.

An external power plug has two short pins. These are used for. a guide for correct alignment of the plug in the socket. the interlock circuit. ground handling bus.

The purpose of a synchronising bus bar is. to enable two propeller systems to be synchronised. to allow monitoring and trimming from the flight deck. to monitor total current load.

To confirm the state of charge of a ni-cad battery. subject the battery to load and check the voltage. measure the discharge time. subject the battery to load, check voltage and check the SG of each cell.

Circulating currents are associated with. AC generators in parallel. DC generators in parallel. AC and DC generators in parallel.

Generator brush bedding. can be done on the aircraft. should only be done if 50% of the width and 80% of the length is already being done. should not be done on the aircraft.

Pitot tubes are heated by. AC. AC or DC. DC.

Paralleling is used for. DC electrical generators only. AC electrical generators only. AC and DC electrical generators.

Battery charging procedures can be found in ATA. Chapter 24 Section 21. Chapter 31 Section 21. Chapter 24 Section 31.

In a carbon pile regulator, the resistive element is. in parallel with the field and changes resistance with changing length. in series with the field and changes resistance with changing length. in series with the field and changes resistance with surface area contact.

Maximum battery temperature on charging before protection circuit starts is. 144 degrees C. 71 degrees F. 144 degrees F.

If an aircraft has no battery charger, the battery is charged by. constant current until a predetermined limit when it automatically switches to constant voltage. constant current. constant voltage.

The output of a carbon pile regulator with no variation of loading is. stationary. pulse width modulating. fluctuating.

In a transistor voltage regulator, the voltage output is controlled by. zeners and transistors. diodes and transformers. transformers and transistors.

A paralleled relay for a DC system is energised and connected by. voltage and current coil. current coil. voltage coil.

Increasing the real load primarily. increases output voltage and increases frequency. decreases output voltage. decreases frequency.

Inductive reactive load causes. increase in torque only. no effect on torque but produces extra heat dissipated. increase in torque and increase in heat dissipated.

The power factor of an AC generator identifies the proportion of. apparent power from the generator that does work. real power from the generator that does work. reactive power from the generator that does work.

Differential protection in an AC system protects against. a reverse current flowing from the battery. line-line, line-line-line, line-earth faults. short circuits.

When resetting the CSD on the ground, the engine should be. rotating at idle. stationary. rotating at Nsync.

One of the main purposes of a CSD is to. enable generators to be paralleled. maintain constant load on the generator. prevent engine overload.

In an undervolt condition in an AC generator system, the most likely consequence is. activation of the time delay circuit. deactivation of the field regulatory TRs. energise the bus tie relay.

If voltage and frequency of the generator drop to zero in flight, it would be an indication that the. bus tie interlock is inoperative. phase sequence detection circuit has operated. CSD driveshaft had sheared.

Assuming all systems are operating normally, as aircraft electrical load increases, generator output voltage will. decrease and amperage output increases. increases and amperage output increases. remain constant and amperage output increases.

When installing multiple batteries on aircraft, they are connected in. either parallel or series and switched between as an option. series. parallel.

What is the small pin on the DC ground power connector?. Ground or earth. Positive to battery relay. Positive to external power relay.

How is RAT driven?. Airstream. Compressor. Fan.

How is an aircraft battery rated?. Ampere hours. Watts. Joules.

A reduction in field strength of a DC shunt motor driving a constant load will result in. reduced torque and increased speed. increased torque and speed. increased torque and reduced speed.

What are the 2 short prongs on an AC plug for?. Using AC current to pull on interlock circuit. To prevent arcing during plug connection / disconnection. To help plug location/fit.

A vibration contact voltage regulator consists of a shunt winding and a. current regulation coil in series. voltage regulating coil in parallel. voltage regulating coil in series.

What is the purpose of diode in a power GCR?. To allow flow in the event of failure of the relay. To speed up the operation. To prevent back-flow of current in the EMF coil.

Eddy currents are. caused by heating effect of the coil. caused by resistance of the coil. circulating currents.

The small pins in the power connector plug are. neutral. negative. positive.

When an overvolt is present on an AC generator system, the tripping circuit. trips at a set level. trips after a time delay inversely proportional to overvolt amplitude. trips after a time delay.

In an AC distribution system, the purpose of the synchronising bus-bar is to. provide a means of monitoring the load. provide interconnection between the generator load busbars. supply essential services.

Vibrating contact voltage regulator sensing coil is. in parallel with the field windings. across the generator output. in series with the field windings.

A current transformer connected across the neutral of a 3 phase generator is for. differential protection. load monitoring. phase sequence monitoring.

Zener diodes are for. voltage regulation. voltage stabilisation. rectification.

AC generator output indications are measured in. KW & KVAR. KW. KVA & KW.