Related Questions

The inverse definite mean time relays are used for over current and earth fault protection of transformer against
A heavy loads
B internal short-circuits
C external short-circuits
D all of the above
Discrimination between main and back up protection is provided by the use of relays which are
A fact
B sensitive
C slow
D none of the above
Which of the following relays is used on long transmission lines?
A Impedance relay
B Mho's relay
C Reactance relay
D None of the above
Thermal overload relays are used to protect the motor against over current due to
A short-circuits
B heavy loads
C grounds
D all of the above
Relays are used for phase faults on long line.
A Impedance
B Reactance
C Either of the above
D None of the above
To protect most of the electrical equipment handling low power, the types of relays used are
A Thermocouple
B Electronic and bimetallic
C Both (A) and (B)
D None of the above
Switches and relays should be shown in this position with no operating force or applied energy:
A Normal
B Closed
C Offset
D Application
The phase lag produced by transportation relays
A Is independent of frequency
B Is inversely proportional to frequency
C Increases linearly with frequency
D Decreases linearly with frequency
Overload relays are of type.
A induction
B solid state
C thermal
D electromagnetic
E all above
Directional relays are based on flow of
A power
B current
C voltage wave
D all of the above

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