WorksheetsMET quiz
Total questions: 15
Worksheet time: 9mins
Which system is preferred onboard ships?
Insulated neutral system
Earth neutral system
All the above
None of the above
Insulated neutral system is preferred onboard ships . Justify
yes. it is simple and cheaper
No. it is costlier
yes. essential machinery will still be run for an earth fault
No. impossible to implement
High voltage systems are adopted in ships with large loads to _________________________.
reduce the size of current
reduce the size of conductors
Both the above
None of the above
Neutral earthing resistor (NER) connected between generator's neutral point and ship's hull is used in
Low voltage (LV) adopted ships
High voltage (HV) adopted ships
both the above
none of the above
In general, more than one generator is synchronized together to handle (select all suitable answers)
Manoeuvring with the bow thruster in use
normal sea going conditions
Cargo loading.
None of the above
Which of the following is/are electrical measuring equipment? (select all possible answers)
Megohmmeter
barometer
Multimeter
Clampmeter
XLPE stands for
(a)
On tankers storage batteries shall not be installed in _________________.
Cargo area
area with Battery systems for emergency supply
Both the above
can be installed anywhere
The most popular gas used in gas circuit breaker is _________
Air
Vaccuum
LPG
SF6
The number of lighting points (lamps) connected to one final circuit (voltage rating over 55V to 125V)shall not exceed
10
14
24
36
Short circuit protection should be set at
overcurrent of more than 50 %, time delay (from 300 up to about 500 ms)
value between 10 % and 50 % overcurrent, time delay of not more than 2 minutes
overcurrent of more than 50 %, time delay of not more than 2 minutes
value between 10 % and 50 % overcurrent, (from 300 up to about 500 ms)
Over load protection produces an alarm and initiates
Reverse-power trip
Short-circuit trip
Preferential trip
holiday trip
Every generator installed shall be equipped with (select all suitable answers)
AVR
Reverse power trip
Synchronizer
Transformer
Salvaging is to _______________ IR.
Degrade
upgrade
restore
remove
Below which insulation resistance value a rotating machine should be sent for salvaging?
less than 0.5 Ω
less than 0.5 MΩ
less than 5 MΩ
greater than 5 MΩ
