ETO ORAL QUESTIONS | FREQUENTLY ASKED | FROM 2018-20 | ETO COC | PART 1

Eto ORAL questions asked in Chennai MMD, Mumbai MMD, Kochin MMD, and Kolkata MMD
(ignore the grammar mistake)

• 15 ppm alarm working principle
• A/C refrigeration working and but cooling. What are the reasons for not cooling?
• ABCDE class fires
• Advantages and Disadvantages of High Voltage
• Advantages of autopilot
• AE alarms and trips?
• Air in the reefer system, indication, and remedy?
• AIS System?
• Alarm circuit of navigational lights draw and explain?
• Alarms in the engine room
• Alarms in Soft starter
• Amplifier using a transistor.
• Annex 1 and ODME discharge procedure and OWS
• Annex 6 SOX, NOX, and VOC (incinerator which annex?), what are the things can't burn in the incinerator?
• Annex IV + cross questions
• As an ETO how to prevent NOX and SOX
• As ETO, what are the tools you carry?
• At which temperature. Heat sensor gives alarm?
• Auto firing sequence of boiler
• Auto pilot block diagram
• Auto start circuit of Emergency Generator
• Autopilot and how it is works
• AVR and its SOLAS regulation
• Backplane Technology
• Basics of different fire fighting mediums on deck.
• Batteries and Difference between lead-acid and nickel-cadmium batteries.
• Battery charging technique used on board and how you will control current in that technique?
• Battery load tester and it's working?
• Battery room requirements and Saturday routines for batteries.
• Before entering enclosed space how do you know your pocket gas detector shows correct reading?
• BJT amplifier
• BNWAS and cross-questions like if duty officer put something on BANWAS alarm then the alarm will come or not what will happen
• BNWAS power supply
• BOD and COD
• Boiler alarms and trip, how to check boiler LL and HL alarm?
• Boiler automation
• Boiler control and troubleshooting. Boiler not starting what's to be checked and how to adjust the air and fuel ratio.
• Boiler flame monitor not working and what are the consequences?
• Boiler ignition transformer voltage?
• Boiler low pressure cut off, it is not starting, and no abnormal alarms on panel, so as an ETO what is your action?
• Boiler Operation and alarms trips, how do you conduct tests on the boiler? DP cell operation and calibration.
• Boiler water level DP sensor working?
• Braking system in lifeboats.
• Bridge equipment and cross-question regarding all the frequency and specification.
• Bridge gives a helm of 10-degree port but rudder stops at 8 degree. What are the reasons?
• BT motor circuit diagram reading
• Bulk carrier- deck crane drawing reading
• Bulk carrier regulation.
• Bulk carrier safeties
• Bulk carrier which chapters in SOLAS.
• Can 60Hz transformer be operated at 50Hz?
• Can autotransformer replace by star delta starter?
• Can bow thruster will run if we have two generators on the bus bar with enough power?
• Can you change the set course of autopilot
• Can you parallel transformers?
• Can you use high voltage on other ships apart from containers?
• Can you vary the speed of the induction motor? How?
• Capacity of the ship in TEU
• Cargo hold smoke detection system-its working and maintenance-How to blow through it and how often? Alarms testing?
• Cargo tank alarms.
• Cascade control
• Cathodic protection
• CCA
• CCP
• Certificates for annex 6
• Chain reaction
• Chemicals in foam extinguisher
• Circuit components identification
• Circuit for float charger
• Class of insulation and temperatures
• CO2 85% discharge time
• Co2 fixed fire fighting for cargo hold and how it is released and cargo hold fire detection system working step by step.
• Co2 room electrical safeties? Apart from the trip switch, alarm, leakage pressure switch, lighting, and ventilation
• Co2 system explains.
• Co2 timer relay and its basic working principle
• CO2 timer, settings and why using the timer in CO2 line
• Compressor room safeties
• Condition for hyper mist system activation
• Conditions for maximum efficiency of transformer and motor and their losses
• Container conventions?
• Container dimensions?
• Container fire fighting equipment and how to fight the fire.
• Container safe convention regulation
• Container safety in detail every point
• Container ship 72 regulations?
• Continuity test for motor
• Conversion of 9VDC to 500VDC in megger
• Covalent Bond
• Crane simple operation i.e. hosting, Lowing, slewing and luffing etc.                   
• Crawling of induction motor
• Criteria for selecting a Contactor in the starter.
• Cross questions on clamp meter and its principle.
• Cybercrime and role of ETO in prevention
• DC to DC converter
• DCP and its working- it's powder name.
• Dead handler breaker?
• Deadweight, displacement, and GRT
• Definition of COD
• DG functions 3, 5, and 6.
• DIAC & TRIAC.
• Diagram of starters
• Diameter of co2 line in the engine room and cargo hold.
• Dielectric Absorption Ratio
• Difference and advantage of neural earth and insulated neural
• Difference between 1 phase motor and 3 phase motor
• Difference between air-conditioning and refrigeration
• Difference between auto transformer starter and soft starter
• Difference between Diode & Zener diode.
• Difference between Flow up and no flow up system.
• Difference between full-wave rectifier and full-wave bridge rectifier
• Difference between high voltage motor and low voltage motor
• Difference between ICCP and MGPS
• Difference between lifeboat and rescue boat.
• Difference between main & auxiliary steering gear
• Difference between PI and PID.
• Difference between port state, flag state, the coastal state
• Difference between PT100 and thermostat
• Difference between safety and relief valve there operating pressure
• Difference between shore and ship transformer
• Difference between star and delta
• Difference between star and delta connection (5 differences)
• Difference between STCW and MLC.
• Difference between the Thyristor and IGBT with a diagram
• Difference between VCB & SF6
• Difference between VDR and SVDR inputs signal
• Different types of earthing.
• Different between COC, COP, and STCW.
• Different classes of garbage (surveyor wanted to hear about the new class of garbage i.e.: electrical category and when it's implemented)
• Digital inputs
• Disadvantage of high expansion foam on the engine room
• Disadvantage of three dark lamp for synchronizing?
• Do you know which type of diode used in Exi module?
• Document of Compliance
• Documents for annexure 2
• DOL, Star-Delta starter, Auto transformer.
• DP & IP
• DP transmitter Draw and explain
• Draw and explain AVR?   
• Draw and explain the earth fault lamp method
• Draw and explain intrinsic safe circuit and tell the values of fuse and max output from the Zener diodes
• Draw and explain the reverse power trip. When it can happened and time settings.
• Draw and explain the ultra-sonic level sensor
• Draw Boiler steam controller circuit diagram.
• Draw circuit diagram and explanation of the star-delta starter and why used,
• Draw circuit diagram for boiler controller for air-fuel ratio
• Draw circuit diagram of WIDAS
• Draw current waveform for the same cycle if the load is resistive in the same diagram.
• Draw diagram of international shore connection?
• Draw ICCP and explain
• Draw OWS and explain and what is the principle of 15 ppm monitor?
• Draw power diagram of star-delta starter. Cross quotation?
• Draw the circuit diagram for oscillator and amplifier
• Draw VFD and explain it.
• Draw the VFD characteristics graph and explain it?
• Draw voltage sine wave form for one cycle,
• Draw voltage waveform for one cycle.
• Dry dock preparations
• During compressor is off-the unloader will be on or off condition?
• During web deflection, what safety works in turning gear?
• Earthed neutral system advantages?
• Echo sounder
• Eddy current uses
• Effect of hysteresis and iron losses in the Transformer
• EIAPP and who issues it
• Electrical survey document and what all things to check-in electrical survey
• Electrical survey equipment
• Electromagnetic brake working
• Electronic governor parts
• Emergency fire pump regulations
• Emergency Generator SOLAS regulations.
• Emergency steering gear step by step procedure
• Enclosed space entry? Gases measured? Will you enter if O2 is 23%?
• Engine Room bilges discharge criteria.
• Engine room crane electro-hydraulic brake
• EPIRB. How it is realized. Working frequency. Satellite name, whom does it inform?
• Exd?
• Exi?
• Explain the gas detection system and its alarm limits.
• Explain about the smoke detector (ionization type) name of the chemical used in that spray.
• Explain about SSAS and BNWAS
• Explain all types of timer?
• Explain all types of Explosion protection?
• Explain DP switch in the boiler
• Explain electrical parts in the main circuit breaker.
• Explain Explosive meter
• Explain GMDSS, regulation for GMDSS battery and capacity test
• Explain how the induction motor run?
• Explain LTA - how many LTA on board and how and where you will use
• Explain MARPOL annex 5.
• Explain Salinometer with circuit diagram
• Explain SOLAS chapter 1
• Explain the Synchro scope.
• Explain the Annual survey and how to make ready?
• Explain the reefer electronic controls expansion v/v
• Explain the three-point starter
• Explain the working of the torsion meter?
• Explain the thermal runway in an induction motor?
• Explain viscotherm and calibration of Viscotherm
• Explain with equations how the clamp meter reads zero in 3 phase wire
• Explain the working principle of Salinometer
• Extinguishers used on electrical fire?
• Fail-safe and fail break
• Few-bridge equipment’s
• Fire Alarm Comes Under Which SOLAS Chapter.
• Fire angle of LEL and HEL
• Fire cabinet requirement
• Fire control system
• Fire detection and alarm SOLAS requirement
• Fire detection system time delay
• Fire extinguisher differences
• Fire fighting system for the deck.
• Fire fighting system in the galley, how will you fight a fire in the galley?
• Fire in purifier room
• Fire plan where it is available
• Fire sequence of the boiler
• Fixed fire fighting on your last vessel
• Fixed fire fighting system foam
• Fixed fire fighting system in the cargo space, periodical maintenance on the same,
• Fixed fire fighting system, How to test the co2 release alarm.
• Fixed Gas sampling unit how it works and how much is the LEL percentage.
• Flame eye working and material
• Flammability diagram
• Foam fire extinguisher in details
• Food waste process.
• Fore Peak store entry
• Forepeak life raft capacity and how many life rafts and locations, how it is inflated, method of release, how HRU is working.
• Frequencies of both x and s band radar and their differences.
• From how many places we can start the fire pump.
• From where you can isolate the BT interlock
• Fuel oil pump starter diagram to read with latch relay
• Full load current in star-delta if the full load current is 25 A.
• Full-wave and half-wave rectifier
• Function 3 5 6.
• Function of dead man handle
• Galley - what type of fire, an extinguisher, what chemical using for extinguishing.
• Galley duct fire, Why Co2?
• Galley Electric range
• Galley fire fighting system.
• Galley fire fighting, for that what extinguisher you will use?
• Galley oil fire and what is the best medium to extinguish an oil fire
• Gas tanker safety
• Generator not developing voltage-Unique reason
• GMDSS batteries discharging and charging regulation
• GMDSS battery and general service battery difference
• Gyro frequency
• Gyro operating voltage
• Gyro output Voltage
• Heat detector types and explain - in bimetallic type what metals are used.
• Heat detector what time will active its types.
• High expansion foam system,
• High voltage generation
• High Voltage IR measurements
• High voltage maintenance on VCB.
• High voltage maintenance precautions and how you do lock out.
• High voltage NER
• High voltage- PI and DAR difference
• Hogging and sagging
• How 500 v generated in Megger form 9 V battery circuit diagram
• How boiler steam pressure transmitters and steam pressure switch works? And what is its role in the boiler steam controller?
• How can we know in case of fire in the bulk carrier cargo hold?
• How can we say the thermistor is a passive transducer?
• How to check the integrity of VCB?
• How a compressor is getting cut in & cut off
• How DCP extinguishes fire
• How does the thermostat work?
• How do we eliminate harmonics?
• How do you calibrate portable O2 ANALYSER?
• How do you calibrate sensors on-board?
• How do you change the battery for PMS?
• How do you test 15ppm alarm, who will provide 15 ppm liquid?
• How does a viscometer (viscotherm) works?
• How does the calibrator work?
• How does working pressure switches?
• How DP is acting and formula for viscosity
• How fire alarm sensors connected to the hyper-mist system? Explain with the figure?
• How hyper mist gets activated
• How insulation and continuity of a long cable be measured?
• How is the boiler water controller works? Name of this controller.
• How is fire extinguished in cargo holds of container ships?
• How is turbocharger rpm measured in the main engine? Is there a proximity sensor present?
• How low-level Hydraulic tank level can be tested, without touching the float?
• How many alarms are there in the AC plant?
• How many certificates in MLC
• How many chemical suits are present and where
• How many types of excitation are there?
• How many types of boiler?
• How many types of fire Sensors there functions.
• How many types of starter, explain soft starter with input & output voltage waveform
• How megger will check and working principle
• How motor works principle and what is dc motor types of dc and ac motors
• How much current flows in case of earth fault? If the maximum current is allowed to flow, why breakers do not trip.
• How much data store in VDR
• How much DC voltage we need to supply for the exciter field?
• How much voltage in the ignition transformer in the boiler and incinerator?
• How should stand by generator coming on load how it.
• How steering gear phase failure alarm working.
• How still motor run in single phasing and effects
• How synchronous motor stars
• How the kW load shared by the governor
• How to calibrate the Boiler DP transmitter?
• How to calibrate DP Switch
• How to carry out me over speed trip and settings
• How to change the setting from harbor mode to sea mode
• How to check boiler float gauge water level alarm, high level, and low level?
• How to check defective motors
• How to check diodes using what instrument how to practically do it, in forward n reverse bias if a diode shows 10 mega ohms resistance in forward-bias, how is the diode condition?
• How to check the insulation of a cable.
• How to check navigation light alarm
• How to check the o2 analyzer device.
• How to check PCB is faulty or good and also no spare part available so you have to find the fault and repair?
• How to check the integrity of the cable
• How to check the under-voltage coil
• How to choose wire? What are the points to be told?
• How to control the speed of motors.
• How to discharge - charge stored in closing spring in ACB While maintenance?
• How to identify motor terminals and then make it Delta connection
• How to improve residual magnetism
• How to increase the speed of the motor by keeping V/F constant in VFD
• How to isolate and test breaker in High Voltage
• How to measure rotor resistance
• How to operate the boiler manually? Not by manually firing-but in emergency?
• How to order Battery, and the difference between cell and battery
• How to reduce static electricity in the cargo discharge line.
• How to run a 3 phase motor on single phase supply? And how to run 1 phase motor on 3 phase supply?
• How to simulate 24V lighting without doing blackout.
• How to start a synchronous motor?
• How to test diode and IGBT?
• How to test HV tester
• How to check the engine room crane brake?
• How u will produce low and high alarm with the help of DP transmitter.
• How we increase the insulation of long wire on deck
• How we rack out VCB
• How we will adjust the pressure switch of hydrophore
• How will you discard a lead-acid battery?
• How will you do a continuity test of the transformer?
• How will you drop life raft if you are alone on board?