Int rao

Ext mirta

Fx 5

Normal and high voltage neutral point condition

Difference between earth and insulted system

Single phasing and safety equipment how to work

Over current protection and how to test

Zener diode where to use on board

Internal: Rao
External: Mitra

Function 5

1.Two generators of unequal capacity, you want to run in parallel within rated capacity. How will
you run ?

2. PID control in governor - how derivative action works ?

3. Conditions for reverse power ?

4. How to test reverse power relay ?

5. Synchronous motor starting methods ?

6. Cogging or magnetic humming of induction motor ?

7. What is thyristor ?

8. What is IGBT ? Why we use in place of thyristors ?

internal - Rao sir[ ]

external - mitra sir [
 ]

Fun 5

How to ground the alternator in hv system? Purpose or ner ? Value of ner(only 1 line
ans he is accepting)

What is the principle on which synchronous machine works? What are the method to
start it ?
How damper winding works?

Short circuit test for transformer? Losses ?

Working of auto transformer?

Star delta starter and auto transformer difference.

Fn 5
1.AVR Zener diode function?
2. Commutator in soft starter?
3. P controller
explain? 4.IGBT vs
Thyristor?
5. How to improve power factor of system except capacitor
bank? Rao

6. problems during synchronisation?

7. How is reverse power operated and how it works.
8.preferential tripping relay working and timings for the
trips.
9. How to order a sea water motor?
how to repair a motor soaked in sea water?

Mmd
kolkata
Bhomick
Internal
Rao
Which was you last ship
Which electric propulsion on ship

Shaft earthing device, where it is placed ,

construction PI test and DAR and test values

Soft stator and PWM

Voltage regulation of transformer

Int: SKD
Ext: Banerjee

1.Power electronics
2. Two refer compressor, one stoped but other did not started? How will you
troubleshoot?
3. Integral controler reduce offset. How?
4. Wire braid is for some electrical phenomenon? What is that? EMI and RFI didn't
accepted.
5. What is dynamic resistance of diode?

Skd and
Banerjee Met
1) 3laws on which IM works. How motor works.
2) on which law core loss of transformer work
3) operational amplifier
4) Types of fire detector. What is infrared type detector how it works

External sarkar
sir Internal Roa

1.What is the use of brush in alternator , why it is there , what is the difference
between brushless and brush alternator

2. How excitation in brushless alternator , how power is taken out , how it is control
3. What are Msb safety for alternator and human

4. Lead acid battery , working ,maintenance, charging , what will happen if level goes
down , and if density goes up .

5. Type of rotor , how to distinguish between then if both kept in one place (
constructional difference) Single phasing all details
Skd bhaumik

1.PI why checked?

2. Difference between single phasing and short circuit. Cause, effect, protection
of single phasing?
3. Alternator routines/maintenance
4. Voltage regulation and x question
5. As a 2nd engineer, morning round observed power factor is less , what to be
checked, how to correct and x-question

1) Alternator specifications
2) High voltage Switchboard safeties
3) Zener Diode. Where is it used?
4) Why is Propeller shaft earthed? And how is it earthed?

Int- srinivasan
sir Ext- Biswas
sir

1.Brushless excitation working

Advantage of it.cooling of stator and rotor how?
Avr functioning, which part of AVR is controlling excitation, function of resistor in AVR
circuit.
2. Transistors, why base is made thin.

3. Cascade control.

4. Air circuit breaker, contruction, function of throwback spring, material of splitter plates,
material of contacts(he asked which one moving or fixe contact is havin silver plating, i
said both he smiled and said no).
5. Salient pole rotor construction, material of salient pole, why salient pole and
why turbo generators size are small.

Srinivasan sir

1.Shaft grounding function, how static charge is generated, micro pitting how?
How much Voltage.

2. Flashing process, how will u know the correct polarity before battery connection.

Sarkar and rao

Function 5
1. boiler remote water level indicator working
2. induction rotor type , actual name of squirrel cage rotor, type of wound
rotor 3.MSB safety, purpose of reverse power trip, how it operate, lots of
cross questions 4.Grounding of BUSBAR, cross questions

Ext- Sarkar and int-

rao Fn5
1. Why induction motor will not run at synchronous
speed. 2.how to convert ac to dc onboard. what
arrangement given. 3.what is zener diode? How it
work?
4. in dol starter, everything. In star delta starter how it will change from star to
delta what arrangement there.?
5. in deck machinery if motor will washed with sea water, how you proceed howw you
run it again what all checks you do?

Biswas,
srinivasan Fn5
1.Gyroscope
2.safety in CO2
line
3.different method for release of life lifeboat
4.classsifiation sociaty certificate
5.forget

Fn5
1. zener diode how to control voltage and where excess
current go. Answer :- through resistance surveyor told me
resistance.
i forget to tell them this things. I explain all this thing but answer is (through
resistance)
2. Construction detail of ammeter
3. vacuum circuit breaker test how.(by srinivasan)
4. normal diode. how developed minority and majority carrier

Function-5
1.Hv motor insulation resistance measuring procedure? What safeties
to take? 2.Losses in transformer?,how to reduce?
3. Capacity of battery how to
check 4.what is thermistor ,where
we use?
5.cycloconvertor and synchroconvertor diffrence

Internal srinivas
1.Explain brushless excitation?
2. E/R vent fan circuit diagram shown
a. Which type of starter in diagram?
b. Why two parellel contactor given ?
c. What are there for motor protection in circuit diagram?

SKD
Fn 5
1.2 DGs are not sharing the load equally when running in parallel, what can be the
cause.? Ans - Speed droop setting of the governor. X-question - what is droop?
2. Difference between star/delta starter and soft starter - Main point is sudden
change over in star delta where as gradual change over in soft starter
3. Causes of single phasing in a motor and its effects?
4. What all checks to be done before taking shore power? X-question - if shore supply
frequency is less than that of ship how can we take it? Ans - Current is directly
proportional to Voltage/ frequency. So if frequency is reduced, we need to ask the
shore to reduce voltage to keep the current constant and prevent motors from
overheating.
5. Alternator protections? X-question - how to test ocit, reverse power relay, what is
the set point of reverse power relay?

Fn5
Ext mitra, Int SKD
1.2 Generators running in parallel, but not sharing equal KW load, reason?
2. What are Alternator safeties that are inside the alternator
3. 3 phase induction motor single phasing protection
4. Working principle of flow
sensor 1 question not being
able to recall No cross
questions asked

Fn5 srininvas banerjee

1.Difference between electronics and power electronics.i didn't know so I started
 guessing, banarjee said even fitter can answer better than you.

2. thyristor? And applications.he wanted more applications.i said only 3-4.

3. Show simple pneumatic valve.and he was not satisfied properly but he said that
I will count this answer.

4. proportional band.i said whih I collected from Google .but he said to tell
me in a normal language.what is it.

5. under voltage trip.i said it will not let acb to close if voltage is lower than
85%.then he said before that one more important point is that.xque.-what will happen
if it not trips.i said more current will flow and can damage winding.

1) ICCP & MGPS

2) Pneumatic push button Diagm
3) According to SOLAS What criteria for electrical
equipment 4)Star Delta
5) Integral function

Internal
srinivasan
External Banerjee
Fun5
What is off set in control engineering.
Draw 4 electrical directional semi conducter
valve? Why H2O mixed in battery.
Tell me four speed control method of induction
motor? Working principle of variable frequency
drive?
Internal
Different between neutral earthing system and insulated earthing
system? In tanker ship what type of insulation system fitted ?

Srinivasan sir Ext: Biswas

1. Fun 5
1.Zener diode and its
properties. Internal took over
2. Showed a circuit diagram and told to identify the starter. Asked many cross
questions( was not able to satisfy)
2. Types of excitation system
3. Working of brushless excitation system.
4. Alternator started after many days and voltage not developing.
5. How to build up residual magnetism
6. Again showed the same circuit diagram and asked to draw star delta starter . (
was unable to draw properly)
Internal again took safety oral

Internal - Chaki
Sir External -
Mitra Sir

1)Two Gen Running in parallel,kW difference reason,amp difference

reason? 2)AVR purpose,working.
3) Cogging in Motor,reason?
4) Star-Delta starter and soft starter.
5) How battery are stored.How state of charge is measured and what is the
instrument and working of it.
6) Alternator Protection,Reverse power trip
working. 7)MSB Survey.

Internal: Gopi
Krishna External:
Mitra Function:5
1.In an electrical system power factor is poor how to improve power factor other
than capacitor bank.
2. Synchronous condenser working.
3. Conditions for transistor to work as a voltage regulator.
4. Intrinsic safe equipment voltage and current rating.
5. Types of excitation. Brushless excitation explain. Proper name for that.
6. Battery capacity test how to carry out. Unit for that.
7. Cogging of an induction motor. How to overcome?

Internal : sishir
External :
bhowmick Fn 5
1.Brush less alternator excitation
2. Single phasing vs short Circuit
3. Reverse power trip
4. Explosimeter
5. Intrinsically safe circuits

15:03:21
Mitra sir n
Rao Fn 5
1.How u will find out which type of starter by looking at the motor?
2. Shore supply of 50hz, how to connect with ship distribution system.
3. Synchroscope in deatails.
If it fails , procedure and arrangement for
synchronisation. 4 Induction motor cogging reason
n prevention.
5. Various method for starting of Synchronous motor ..
6. Cycloconverter in deatails.

Fn-5
Star delta Starter in Motor, arrangements
Induction motor not starting making humming noise,
reasons Synchronous motor working and starting
arrangement Insulated Netral and Earthed neutral,
reason

Hoon and Chaudhary

Fn-5
1.EXi(a) and EXi(b)
2. how to check diode
3. dashpot
4. acb maintainance

Fun 5
External- Anukul
hoon Internal -
Chaudhury

1.Type of ship, Exi a and Exi b, flameproof

2. Synchoroscope details, other ways to synchronization
3. Single phasing and how to check, protection
4. Brushless alternator details and cross questions
5. Diode test
6. Shore connectionbox

Fun-5, Electrical

External- Ankul Hoon

Internal - Chaudhary
1. EXI(A) and EXI (B) ,where it is used?
2. What is offset and how will you minimize or eliminate the offset ? What is Integral
control?

3. In star delta starter of cooling sea water pump , pump started with star connected
and didn't get switch over on delta - Then how will know during the watchkeeping
round ?

4. Difference between thermistor and thermostat ? From which semiconductor the

thermistor is made of ?

5. During drydock what all electrical checks and maintenance to be carried out ?
How will you isolate busbar when shore supply is
connected? What all maintenance to be carried out on
bus bar ?

Sarka
r Rao

Function-5
1- types of induction motor rotary..in wound type rotor whY winding are provided..x
question. 2- electrical propulsion all details.
3- earthed and natural earthing system full.
brushless alternator excitation full..lots of cross
question..how u will identify just by seeing it is
bruless excitation system. And advantages over
brushed alternator only electrical advantages.

Biswas&Rao
Ele:
1. ICCP
2. semi conductors explain,what it is called semi conductor etc, majority minatory
carriers etc 3.Transistors as a amplifier explain
4. cascade controler
5. potentiometer working, difference between potentiometer nd galvanometer

Ext Biswas
Int Rao
Electrical
1.ACB component and material
2. Vacuum diode , zener and avalanche diode
3. Brushless alternator description
4. Voltage doubler
5. Thyristor use on ship

Skd and mitra

FN 5
1.Faithful amplification of transistor
2. Alternator protection
3. What is OPAMP
4. What does D do in PID of electronic governer
5. Battery load test, how we carry out

banerjee

Electrical
Synchoscope
Incoming gen frequency less while paralleling, what u
adjust Thermionic semiconductor
Power
electronics
Micro controller
Welding machine open circuit significance

Rao and
Ganguly Fun 5
1. D+I CONTROL
2. Why Hv used on ship? what's the advantage...
(he wanted to hear mainly the reduction in cross-section area of the cables)
3. Reverse power trip and how do we test it.
4. Polarisation index and how much value
5. Forgot

Function
5 Int skd
Ext sinha

1. Diode test
2. Battery maintenance
3.Zener diode Function in
AVR 4.Types of electrical
diagram
5. SF6 circuit breaker

Electrical

How ACB is ON...ACB on kaise hota hai

What is MGPS ,electrodes used , what is input and output power supply, electrode
kaise kaam karte hai
You are 2nd engineer at morning watch 5.40 am 440 low insulation happens what is
your action MSB fire how will you fight
Alternator name plate details
pucha How power is generated in
generator.

Int-
Srinivasan
Ext- Biswas
1.................................................................................................................. what is insulation
resistance... Its significance.... Factors affecting it.........................What should be ideal
value...What will happen if it is less and you operate the motor.
2. Moving coil ammeter working
 3. What is meant by Ex i.... What are other types What is Ex i (a)and Ex i (b)
4. What will you do if IR test result of a motor is not
satisfactory. 5.Don't remember
Decider-
1.What all maintenance.... What should be IR test value Then he asked what will be you
check
if air gap is less than recommended value(i said few things but he got satisfied when i
said condition of pedestal bearing to be checked and replace if required )

Int srinivas
Ext :-
Biswas Fn-
5
1.Brushless excitation and Avr working.
2. Minor charge , major charge particle details.
3. Promoter working.
4. DP cell working.
5. Auto transformer starter.

Mitra and skd

Fn 5
1.Transformer max efficiency criteria
2. How to test overcurrent relay
3. Negative feedback relay advantages
4. How to vary the speed to induction motor
5. How do u know what resistance value is required for ur neutral
earthing resistor? Why ner is provided

Internal skd
External
Mitra Fun-5
1.Induction motor copper loss,half load copper loss.induction mortor clogging.
2. Synchronous motor not self starting, if synchronous motor no load running....
3. shore connection safety checks.shore connection box all features,if 50 hz
supply from shore but ship has 60 hz what u will do..
4. shoft stater how it work.. function of igpt.function of zener diode in shoft starter.

5. hv safety. Why nutral earthing , function of ner,if not fitted what will happen.
Acb contact meterial ...
 Fun5: skd and mitra

How to connect 2 generators parallely so that %load will be same, among which
one with 1000kw and other with 500 kw?

Status of neutral in HV system?

What parameters of conductor determine current carrying

capacity? What is operational amplifier?

How transducer work in automation system?

Fn..5 bhaumik and rao

1.avr and brushless

excitation 2.shaft earthing.
3. alternator specification.
4. soft starter
5.trickle
charging

Paul and chaudhary

Fxn 5
1.What is high voltage? How high voltage ship generators are generating high
voltage? Cross questions
2. TRIAC, BJT
3. CLOSE LOOP SYSTEM... CROSS
QUESTION 4.HEAT SINK?
5. EMGY GENERATOR ON LOAD TESTING CROSS QUESTIONS
6. AVR WORKING,,,, CROSS QUESTIONS

Ganguly and rao

1.How to find current Rating of Wire
2. How to check Earth fault
3. Polarization index. What is the name of instrument to measure IR, is it hand cranked
or motor driven. can we use 5000V dc to measure IR of 11kv
4. What is negative feedback amplifier
5. Can't recall now, will update

Kolkata mmd
Bhomik sir n
skd

Electrical first attempt

Alternator
specifications AVR
Polarisation index
Shaft grounding system
Interlock working process in emergency
generator Soft starter full details

Bhaumik and skd

Electrical
Alternator specifications
AVR
Polarisation index
Shaft grounding system
Interlock working process in emergency
generator Soft starter full details
N many cross questions

AK Chaudhary and mitra

Fn 5
1.Alternator inside safeties
2. Faithful amplification of transistor
3. How to determine motor used to be of star delta starters
4. Forgot
5. Difference between syncroconverter and cycloconverter
Internal choudhary sir
External Mitra sir
Fn5
1.Two generator running with same load but different current
reason 2.battery test run test
3. synchronus condensor
4. cable insulation type of
alternator 5 .over current trip
test

1- High voltage system,why we used on board.

2- Sf6 & vacuum crk brk internal construction
difference 3-JFET & types of FET & que regarding
mosfet
4-Cyclo converters & regarding- what is actually triggered in side this
Que-5 Under volatge protection - happened before synchronization & after
synchronization, how it works in both cases

Banerjee
Srinavasn

1.Hazardous area
protection Ex i what is it?
Wanted some one line answer did not know what he wanted
2. Air compressor motor not working
Elec checked. Fuse supply and connection
all ok. As second eng what will u do??
3. Can derivative control can be used alone?
Yes or no ? Why derivative control used? Why integral?
4. Alternator maintenance by second engineer in the absence of elec on board.
I got stuck in electrical isolation as he did not want to listen abt mechanical
isolation of prime mover*
Ganguly /srinivas

Function 5
1. Derivatives control and where it's applicable
on ship 2.what are safety provided in shore
supply connection
3. High voltage system, how u test the insulation resistance of high voltage
instruments and 3 phase machinery
4. reverse power trip , & how u test the reverse power trip .
5. what are the maintenance done on alternator, scr, thyristor, diode, how u
test diode, Why the layer of oxide formation at the battery terminal.

Fncn 5

Srinivasan
Ganguly
*HV system and related
* Diff b/t magnetic locking and interpoles
*Dash pot
*Proportional controller level
* Short circuit level
*Short ckt nd open ckt

Deciders
*IR test of alternator what precautions
* In fluroscent tube what to do to increase power factor

SKD sarkar

Fun-5
1.How voltage is generated in brushless alternator
2. What is difference between brushless and conventional alternator... Brushless
alternator advantages.
3. Power factor correction method... Asked me to draw how capacitor bank is
connected in the circuit.
4. Safety protective devices on MSB.
5. Reverse power relay.

Bhaumik

1. Avr working nd uses

2. voltage regulation of
transformers 3.Battery
maintenance
4.Reverse power trip wht will hppn after
trip 5.soft starter
6.power factor