MOTOR STARTING METHOD

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Star Delta Starter This is means of reducing starting current of induction motor by initially connecting to the stator winding to ‘STAR’. Once the motor comes up to speed (68%) to be connected in DELTA. When motor start in ‘STAR’ it has the effect of: Reducing...

LATEST ELECTRICAL TECHNOLOGY MMD ORAL Q & A PART-6

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(a) Explain about BJT (Bipolar Junction Transistor),Uni-junction transistor. (b) Describe about NPN and PNP transistor with sketch. (c) Describe about Thyristor,GTO(gate turn off thyristor) (d) Describe about MOSFET operation, Snubber circuit. (a) BJT (Bipolar Junction Transistor) Three terminal device,...

ALTERNATOR SYNCHRONIZATION

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SYNCHRONIZING AND PARALLELING OPERATION OF ALTERNATORS Main generator units(steam turbine, diesel driven & shaft driven) have to be run in parallel to share a total load that surpass the capacity of a single machine specially when discharging cargo, loading...

CAPACITOR

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A capacitor is a two terminal electrical component used to store electrical energy temporarily in an electric field. The types of practical capacitors vary widely, but all contain at least two electrical conductors (plates)...

LATEST SOLAS & MARPOL AMENDMENTS

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MARPOL 1) 1st  March 2018 – Data collection system for fuel oil consumption on ships. IMO documents : MARPOL Annnex 6, regulation 22, 5000GT & above. Entry in to force(EIF) under tacit acceptance procedure : 1st March...

CIRCUIT BREAKER

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A circuit breaker is an automatic device which is designed to stop the flow of current in an electrical circuit and save the electrical circuit from damage caused by overload or short circuit. Its main...

SEMICONDUCTOR

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A semiconductor is a type of material posses electrical conductivity between conductor and an insulator.They are neither good conductor nor good insulators. The electrical resistivity of semiconductor generally decreases strongly with increasing temperature.Semiconductor atoms...

MAIN SWITCH BOARD

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Survey of MSB Proper cleaning to be carried internally as well as externally normally carried out when board is completely dead (all generator stopped and prime mover locked off). Inspect for dirt and dust (electro clean and vacuum...

RELAY

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A relay is an electromagnetic switch device which utilizes very small electric current that can turn on or off a much larger electric current. The heart of a relay is an electromagnet. A relay is...

RUDDER ANGLE INDICATOR

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It is a device which is used to indicate the current position of the rudder blade, normally fitted in the wheelhouse, bridge wings and engine control room. A rudder angle indicator consists of a feedback...

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