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WorksheetsPower System Protection and Switchgear Quiz 1
Total questions: 10
Worksheet time: 5mins
Relay contacts are normally made up of: _______.
Silver
Copper
Aluminum
Lead
Impedance relays can be used for:
Phase faults
Earth faults
Both A&B
None of the above
The most efficient torque-producing actuating structure for induction type relays is:
Shaded pole structure
Watt-hour meter structure
Induction cup structure
Single induction cup structure
Thermal relays are used for the protection of motors against over-current owing to:
Short circuit
Heavy loads
Earth fault
None of these
The relay used for the feeder protection is:
Under-voltage relay
Translay relay
Thermal relay
Buchholz relay
The values of fault current depend on
Voltage
Total impedance
both (A) and (B)
None of the above
A relay used for protection of motors against overload is
Impedance relay
Electromagnetic relay
Thermal relay
Buchholz's relay
The over-voltage surges in power systems may be caused by
Lightning
Switching
Resonance
Any of the above
The protection against over-voltage due to lightening is provided by
surge diverters
Low tower footing resistance
Use of overhead ground wires
Any of the above
Over-voltage transients may occur due to
Lightning
Switching
Arcing grounds
Any of the abov
