Marine electrical technology
(FUNCTION 5)
- What is a magnetic contactor? Where is it used?
- What happens in soft starter?
- What is a relay? How is it different from a magnetic contactor?
- Difference between ACB and OCB?
- Can you draw a DOL starter circuit?
- What's non essential load ?
- What is the meaning of overload?
- What is HRC fuse?
- What is meaning of short circuit?
- What is transformer rating and why is it required ?
- How is protection provided for OL and SC?What do u mean by eddy currents
- What r d reasons for eddy currents to form and where do they form?
- What is the function of a fuse?What is power factor?
- What is a commutator and its used?
- What is the normal setting of overload relays?
- How does a thermal overload relay work?
- What is single phasing?
- How can single phasing happen?
- What is the harm caused by single phasing?
- What protection is provided against single phasing?
- Why is it necessary that incoming alternator frequency is more than bus bar?
- What is dark lamp and bright lamp method for synchronizing? How is the connection made?
- Apart from renewing bearings is there any reason for opening up motors for maintenance?
- Why is reverse power protection required?
- Why is this reverse power used instead of reverse current in alternators?
- What is the meaning of excitation in an alternator?
- Is the field current in an alternator AC or DC ?
- Is the field rotating or stationary?
- How is field current supplied?
- What is a brush less alternator?
- How is the excitation achieved in brushless alternator?
- What is the meaning of residual magnetism?
- Why is an air compressor started unloaded?
- How is the speed of a 3-phase induction motor varied?
- How is the direction of rotation varied?
- How does this cause a rotation to change?
- How is the speed of a DC motor varied?
- How is the direction varied?
- What is a diode?
- What is a zener diode?
- What is a thyristor? What is an SCR?
- How does an inverter work?
- How does a tube light work?
- What is the function of the starter in a tube light?
- What is the function of the choke?
- Where is a slip ring used and where is a commutator used?
- What is capacitance?
- Does current flow though a capacitor?
- What is the unit for capacitance ?
- What is a neutral?
- What is the difference between neutral and earth?
- What is a synchronous condenser?
- Where and why is synchronous condenser used?
- If a motor is wound star and you want to change to delta what should you do?
- If the AVR, is defective, when additional loads come on will the generator be able to take it?
- How do you test, reverse power trip, high current trip, preferential trip?
- What is residual magnetism? Where is it important?
- Sometimes, when you change the running direction of a E/R blower (from supply to exhaust) it trips. Why?
- What is the function of the friction clutch mechanism used in purifiers?
- What is the regular maintenance done on batteries?
- What safety precautions need to be taken during maintenance on batteries?
- Why is special lighting used in battery rooms?
- What is the voltage available from each cell in a lead acid battery?
- What is the full battery voltage ?
- How is this voltage achieved?
- What is the meaning of a normally open contact?
- How does a Salinometer function?
- How does the air compressor start and stop automatically?
- How is the cold room temperature maintained?
- What is a self-monitoring alarm circuit?
- Out at sea, if there is a black out during your watch, what action will you take?
- After a black out the emergency generator comes on; On restoring the main supply we are closing the circuit breaker of the main generator with out bothering about synchronizing. How is this possible?
- How does the emergency generator start automatically?
- If all your air bottles are at low pressure and there is a blackout how do you start the generators?
- What is a shaft generator?
- Even though the main engine runs at varying speeds, how does the alternator maintain constant frequency?
- Is the alternator connected star or delta
- Why is 440 V used for motors and 110/220 V used for lighting?
No comments:
Post a Comment