WorksheetsPOWER SYSTEM PROTECTION
Total questions: 10
Worksheet time: 5mins
Which of these are symmetrical fault
L-L
L-G
L-L-G
L-L-L
The component which provides a signal to circuit breaker under the fault condition:
Isolator
Fuse
Relay
CT
The correct statement about Buchholz relay
It can only be used with largely sized alternators
It is installed with largely sized transformers which have no conservator tank
It can detect incipient faults
It should never be used with oil immersed transformers
High-speed circuit breakers result in:
Increased stability of power systems
decreased stability of power systems
The hysteresis losses do not depend on
Volume of material
Magnetic field
Frequency
Either of them
None of these
The equipment which has lowest chances of fault occurrence:
Alternator
Transformer
Switchgear
Induction motors
Permeability in the magnetic circuit is analogous to
Resistance in electrical circuit
Resistivity in electrical circuit
Conductivity in electrical circuit
Current density
None of the above
A voltage source can be converted into constant current source by adding
Low resistance in parallel with the voltage source
High resistance in parallel with the voltage source
Low resistance in series with the voltage source
High resistance in series with the voltage source
The current transformer can also be used to measured high d.c. current.
True
False
Which of the following materials are diamagnetic?
copper
silver
gold
iron
