sort9m2t, 3:18 PM Generator Generator Total points 44/50 The respondent's email (202110eto34@geims.in) was recorded on submission of this form. By what means is the frequency of an AC generator " controlled? O capacitor ®© governor v © theostat O exciter Y Agenerator has been exposed to water and needs to be checked before 1/1 it can be operated safely. After performing the necessary procedures for drying the generator, what test needs to be performed before safe operation can resume? © ground the commutator, or slip rings and run it at half load for 12 hours © test insulation values with a megger v © check for shorted coils with a growler © take moisture readings with a ydrometer hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UISTOREZWHPVKPehZDISExkhq7ELPkinMOTUZOWviewscore?viewscore=AEQzAgCUSAIM.... 1/29,sort9m2t, 3:18 PM Generator Y_ Athree-phase alternator has a load current of 300 amps, with a 0.8 WW power factor, and supplying 450 volts. What will be the power indicated on the kilowatt meter, located on the main switchboard? © 133 kw O 212kw @ 187kw v O 155kw YY A turbo generator has a rated output of 1200 kW at 60 nn Hertz, with ano load frequency of 61.5 Hertz. What is its speed droop? @ 0.02439 v © 0.01025 © 0.015 © 0025 Y AC generator circuits are protected against malfunctions due to prime 1/1 mover power loss. Specifically what device or devices provide this protection? © reverse power relays © reverse current relays © main bus disconnect links © aseparate battery backup hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UI9TOEZWHPVKPehZDISExkhq7ELPkinMOTUZOlviewscore?viewscore=AEQzAgCUSAIM.... 2:29,sor19m21, 3:18 PM Generator An AC generator produces 60 Hz at 1800 RPM. If the Ww generator speed is increased to 1830 RPM, what will happen to the frequency in Hz? © decrease to 59 Hz © increase to 63 Hz © increase to 61 Hz v O remain at 60 Hz X_ Analternator is being paralleled with one already on the line. At the on INSTANT the incoming generator circuit breaker is closed, what will happen to the frequency of the incoming alternator? © decrease © increase © not change ©@ be exactly 60 hertz x Correct answer @ decrease hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UISTOEAWHPVKPehZDISExkhq7ELPkinMOTUZOlviewscore?viewscore=AEQzAgCUSAIM.... 2:29sor19m21, 3:18 PM Generator Y_ Anopen occurring within the field rheostat of an AC Ww generator can be detected by short circuiting its terminals and making specific observations. What should be checked for? negative deflection of the wattmeter pointer buildup of alternator voltage v low, but constant alternator voltage OoO@°0 positive deflection of the watt meter pointer VY Asaresult of a serious mechanical malfunction in one of the ship's w service generators operating in parallel, you must secure that generator. In order to prevent a possible overload to the remaining generator, which of the following sequential courses of action should be taken? Trip all nonvital distribution feeder circuit breakers, the malfunctioning prime mover turbine throttle trip, and the generator circuit breaker. Trip the malfunctioning generator's circuit breaker and distribution feeder circuit breakers. Trip all nonvital distribution feeder circuit breakers, remove the remaining load on 7 the malfunctioning generator and trip its circuit breaker and then the prime mover throttle trip. Oo ® 0 0 Trip the malfunctioning generator's circuit breaker and prime mover throttle trip, hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UISTOEZWHPVKPehZDISExkhq7ELPkinMOTUZOlviewscore?viewscore=AEDzAgCUSAIM.... 4/29sort9m2t, 3:18 PM Generator X_ Alow voltage source is applied to the collector rings of asalient-pole 0/1 alternator to test for shorted coils. As the voltage drop across each coil is recorded, what would be the indication of a short-circuited coil? © steady voltmeter reading, while the other coil readings are fluctuating © high voltage reading, while the other coil readings will have an equal or lower value © fluctuating voltmeter reading, while the other coil readings are steady x © low or zero voltage reading, while the other coils will have higher readings Correct answer ©@ low or zero voltage reading, while the other coils will have higher readings Y Asload is added to an AC generator provided with constant field m excitation, the prime mover slows down. What immediate effect will this have on frequency and voltage? © lowering frequency and increasing generated voltage ©@ lowering frequency and lowering generated voltage v © increasing frequency and lowering generated voltage © increasing frequency and increasing generated voltage hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UI9TOREAWHPVKPehZDISExkhq7ELPkinMOTUZOviewscore?viewscore=AEQzAgCUSAIM.... Si29sort9m2t, 3:18 PM Generator By what means is a constant output voltage from an AC generator Ww maintained? reverse power relay prime mover governor exciter generator @ooo0o voltage regulator v By what means is an AC generator prevented from m becoming motorized? governor controls overspeed trip reverse power relay. v Oo@O00 back pressure trip Y_ A4160 Volt AC generator is loaded to 2850 kW with a 0.85 power factor. 1/1 What is the approximate kVAR load on the generator? © 3353 kVAR © 503 kvaR © 2850 kVAR ©@ 1766 kvaR v hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UISTOREZWHPVKPehZDISExkhq7ELPkinMOTUZOWviewscore?viewscore=AEDzAgCUSAIM.... 6/29sort9m2t, 3:18 PM Generator YA four pole turbo generator is used in conjunction with a 160 pole m propulsion motor. If the generator is turning at 3,200 RPM, what is the current speed of the propeller? @ 20RPM v © 60RPM © 100 RPM © 40 RPM By what means is the output voltage of a 440 volt, 60 Hz AC generator 1/1 controlled? © varying the speed of the prime mover © varying the load on the alternator © varying the exciter output voltage v © varying the load on the prime mover hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UISTOgEZWHPVKPehZDISExkhq7ELPkinMOTUZOWviewscore?viewscore=AEUzAgCUSAIM.... 7/29,sorn9r21, 3:18 PM Generator X_ By what means is the voltage of an operating AC turbo on generator raised or lowered? © generator field exciter © phase sequence switch © exciter generator governor controls x © synchronizing switch Correct answer © senerator field exciter By what means is voltage and current generated by modern revolving 1/1 field AC generators brought out from the alternator enclosure to the connected switch board? © brushes on @ commutator © irect connections from the stator v © brushes on slip rings © brushes on collector rings hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UI9TOgEZWHPVKPehZDISExkhq7ELPkinMOTUZONviewscore?viewscore=AEQzAgCUSAIM.... 8:29sor19m21, 3:18 PM Generator By what mechanism does a reverse-power relay prevent AC generator 1/1 motorization? ‘ripping the panel board main switch ‘ripping the generator circuit breaker v automatically speeding up the prime mover OO0@0 automatically redirecting the load 4K Compared to conventional alternators, brushless alternators are w designed to operate without the use of what? slip rings and commutators v voltage regulators exciters O00 ®@ rectifiers hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UISTOREZWHPVKPehZDISExkhq7ELPkinMOTUZOviewscore?viewscore=AEDzAgCUSAIM.... 9:29,sort9m2t, 3:18 PM Generator Diesel generators #1 and #2 are operating in parallel at near fullload = 1/1 capacity. Diesel generator #1 suddenly trips out mechanically due to low lube oil pressure. The reverse power relay functions properly and trips generator #1 electrically off the board. Which of the following actions should you carry out FIRST? © Strip the board of all nonvital circuits. v CO Start the emergency generator. © Secure alarms, reset reverse power relay, and restart #1 engine. © Ascertain cause of the low lube oil pressure. How are the number of cycles per second developed by the alternator 1/1 aboard your vessel determined? ©@ the speed of the engine driving the alternator v © the adjustments made to the voltage regulator © the synchronous speed of induction © the resistance applied to the field rheostat hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UISTOREZWHPVKPehZDISExkhq7ELPkinMOTUZONviewscore?viewscore=AEUzAgCUSAL... 10/29,sor19m21, 3:18 PM Generator Y Howis the frequency of an alternator at a given RPM m determined? by the number of turns of wire in the armature coil by the number of magnetic poles v by the output voltage OO0@0 by the strength of the magnets used Y_ Howis the frequency output of an operating alternator ” controlled? output voltage strength of the magnets used relative speed of the rotating magnets v number of turns of wire in the armature coil Oo@O00 4K How is the power factor of an AC generator operating mM singularly determined? the ground current ‘the generators rated voltage the prime mover speed @ooo0o the connected load v hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UISTOREZWHPVKPehZDISExkhq7ELPkinMOTUZOWviewscore?viewscore=AEQzAgCUSAL... 11/29,sort9m2t, 3:18 PM Generator How would you increase the frequency of an operating AC generator? 1/1 increase the speed of the prime mover, v decrease the field excitation increase the number of magnetic poles increase the field excitation OOO © K If a modern brushless alternator is to be inactive for an " extended period of time, which of the following actions should be taken? Insulation resistance readings should be taken weekly to ensure resistance is not deteriorating ‘The disconnect switch or links should be opened and the space heater v energized. It should be disconnected from the prime mover and raised off its bearing supports. oO 8 O The disconnect switch or links should be closed and the space heater de- energized. Y_ Inaconventional AC generator utilizing brushes, direct mn current from the exciter output is passed through the windings of the main field rotor by what means? ‘to minimize the danger of arc over by means of a commutator by means of slip rings v Oo@o°0 by means of rotating bar magnet hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UI9TOgEAWHPVKPehZDISExkhq7ELPkinMOTUZONviewscore?viewscore=AEQzAgCUSAL... 12:29,sort9m2t, 3:18 PM Generator Y _ Onsome electrical generating equipment one outboard " bearing pedestal is insulated from the bedplate. This should be checked with a millivolt meter and a jumper. With the millivolt meter connected between the shaft and the bedplate how should the jumper be used? It should be placed from the shaft to the pedestal while one reading is taken, 7 ©@ then removed to take a second reading. This eliminates the insulating effect of the bearing © Tisusedte shor the + and- Ina 6. generator or Phase A and Phase © in an alternator to eliminate the effects of CEMF. © Itshould be placed from one end of the shaft to the other to eliminate shaft currents. © tstould be placed across the insulating black to inorenge the ahaft current toa point where it can be measured with the millivolt meter. Y Rotor-to-stator air gap readings for electrical generating Ww equipment should be taken periodically. For what reason should these readings be taken? |. determine the condition of the bearings Il. prevent damage to the rotor and stator © both | and I v O lon. O Monty, © neither | or i hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UISTOEZWHPVKPehZDISExkhq7ELPkinMOTUZONviewscore?viewscore=AEQzAgCUSAL... 12/29sort9m2t, 3:18 PM Generator VY Rotor-to-stator air gap readings should be periodically taken for " electrical generation equipment. What is the best tool to use to take these measurements? cloth (non-metallic) tape measure ‘tapered, long blade, feeler gage v dial indicator oO @ 0 inside micrometer VY Rotor-to-stator air gap readings should be taken on electrical generation 1/1 equipment periodically. Why is this necessary? |. check machine efficiency Il. determine the need for cleaning Vonly both | and Il neither Iori v Oo@O00 Monly hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UISTOEZWHPVKPehZDISExkhq7ELPkinMOTUIZONviewscore?viewscore=AEQzAgCUSAL... 14/29,sort9m2t, 3:18 PM Generator VY Rotor-to-stator air gap readings should be taken on electrical m generation machinery periodically. Why is this so? |. determine the need for cleaning Il. check the condition of the bearings both | and Il lonly Monly v neither | or Il Oo@O0O0 < Suppose the bearings of an electrical generator are failing more a frequently than expected and the lubricating oil is sludging. What should be done? replace the bearing with a sealed roller type replace the thrust bearing of the prime mover check the connections to the output leads @ooo check the bearing insulating block on one end of the unit v hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UISTOEZWHPVKPehZDISExkhq7ELPkinMOTUZONviewscore?viewscore=AEQzAgCUSAL.. 15/29sor19m21, 3:18 PM Generator The governor control switch of an alternator is moved to the ‘raise’ Ww position. What will be the effect of this action? raise the no-load speed setting of the governor v lower the percentage of speed droop lower the no-load speed setting of the governor O00 ®@ raise the percentage of speed droop The instantaneous reduction in voltage of an AC generator, resulting 1/1 from an increase in load and prior to the automatic voltage regulator correcting the situation, is called what? voltage regulation voltage drop voltage droop @ooo voltage dip v < The purpose of the reverse power relay, provided ona ship's service 1/1 alternator panel, is to trip the alternator circuit in the event of a very specific situation. What situation is this? main circuit overload high power transfer alternator motorization v Oo@O0°0 generator overspeeding hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UISTOREZWHPVKPehZDISExkhq7ELPkinMOTUZOWviewscore?viewscore=AEDzAgCUSAL... 16:29sort9m2t, 3:18 PM Generator VY There are very specific rules that govern the testing of " generators found in the appropriate publication incorporated by reference,which agency publishes the rules for the construction and testing of generators. Underwriter's Laboratories, Inc. American Bureau of Shipping v ASME manufacturer OO0@0 Y To determine if a stator coil on a AC generator is grounded, you should 1/1 use a/an ammeter voltmeter magneto @ooo megger v hitps:docs. google comiforms/e/1FAlpQLSdvd_s0TS2UISTOEZWHPVKPehZDISExkhq7ELPkinMOTUZONviewscore?viewscore=AEQzAGCUSAL... 17/29,sort9m2t, 3:18 PM Generator Unnecessary and frequent applications of insulating varnish to the Ww generator stator windings to repair defective insulation may have what detrimental effect? © improper heat dissipation v © shorting out the line leads © ‘failure of the rectifier assembly © deficient air gap clearance and eventual damage to the casing What is a bus disconnect link used to isolate? w © one bus bar from the ground detection system © different bus phases from the equalizer connection ©@ the generator circuit breaker from the bus v © positive and negative buses from the neutral hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UISTOEZWHPVKPehZDISExkhq7ELPkinMOTUZOWviewscore?viewscore=AEQzAgCUSAL.. 18/29sort9m2t, 3:18 PM Generator x What is prevented by one of the generator or motor bearings being 0/1 generally insulated from the end housing with which it is associated? rapid brush wear circulation of shaft currents induced in the machine's frame excessive field winding heat x Oo@o0°0 current leakage from the shaft Correct answer © circulation of shaft currents induced in the machine's frame What is the correct name for a variable resistor wired in m series with the shunt field for the purposes of manually controlling generator output voltage? rheostat bleeder resistor bridge OOO © variable shunt strip htpssdocs. google. comiformsea/FAlpQLSdvd_sOTS2UISTOgEZWHPvKPohZDISExKhq7ELPkinMO7UIZOIviewscore?viewscore=AEDZAGCUSAL 1929sorn9r21, 3:18 PM Generator X__ What is the function of automatic voltage regulators as on provided on switchboards? © protect the switchboard from high voltage x © regulate the AC load on the generator © vary the field excitation to the generators © govern prime mover speed to control voltage Correct answer ©@ vary the field excitation to the generators Whats the main purpose of an electric space heater Ww installed in a large AC generator? keep the lube oil warm for quick starting prevent moisture from condensing in the windings during shutdown v prevent the windings from becoming brittle OoO0@0 prevent acidic pitting of the slip rings hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UISTOREZWHPVKPehZDISExkhq7ELPkinMOTUZONviewscore?viewscore=AEDzAgCUSAL... 20:29sor19m21, 3:18 PM Generator What is the most common type of AC service generator m found aboard ship in terms of armature and field types? stationary armature, rotating electromagnetic field type v stationary electromagnetic field, rotating armature type stationary electromagnetic field, oscillatory armature type O00 ®@ stationary armature, oscillatory electromagnet field type What may be the cause of an AC generator to fail to on produce a voltage? © anopen in the rotor field circuit © short circuit in the stator coils x © high mica segments on the stator bus bar © atripped bus circuit breaker Correct answer @ aanopen in the rotor field circu hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UISTOEZWHPVKPehZDISExkhq7ELPkinMOTUZONviewscore?viewscore=AEDzAGCUSAL... 21/29sor19m21, 3:18 PM Generator What should be done regarding the windings of electric Ww generators during idle periods? © allowed to cool slowly to ambient temperatures © relieved of all capacitive charge by grounding the conductors © kept warm by using strip or space heaters v © flashed with direct current to remove any residual magnetism What will result in an alternator failing to produce line ” voltage? © improperly staggered brushes © excitation field failure v © oxidized slip rings © closed circuit breaker When an alternator is to remain idle for even a few days, " what should be done? CO lift the brushes and disconnect the pigtails © open the equalizing bus disconnect switch © insulate the collector rings with strips of cardboard © energize the space heater circuit v r This form was created inside of Great Eastern Shipping Co.Ltd. hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UISTOgEZWHPVKPehZDISExkhq7ELPkinMOTUZOWviewscore?viewscore=AEQzAgCUSAL... 22/29,sort9m2t, 3:18 PM Generator hitpssdocs. google comiforms/e/1FAlpQLSdvd_s0TS2UISTOREZWHPVKPehZDISExkhq7ELPkinMOTUZONviewscore?viewscore=AEQzAgCUSAL... 22/29,