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
The single phasing relays are used for the protection of
A single phase motors only
B two phase motors only
C two single phase motors running in parallel
D three phase motors
Switches and relays should be shown in this position with no operating force or applied energy:
A Normal
B Closed
C Offset
D Application
Who built the world's first electronic calculator using telephone relays, light bulbs and batteries?
A Claude Shannon
B Konard Zuse
C George Stibitz
D Howard H. Aliken
E 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
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
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
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
Relays can be designed to respond to changes in
A resistance, reactance or impedance
B voltage and current
C light intensity
D temperature
E all above

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