Question 1: A differential relay acts on the principle of difference between which of the following electrical quantities?
- voltage
- current
- impadance
- any one
NEC CODE
NEC 2023
Protective Relay Objective Questions Quiz
Free online quiz on Protective Relay objective questions.
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Electrical Practice Questions
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The National Electrical Code (NFPA 70) is the benchmark standard for safe electrical installation in the US. It is updated every 3 years by the NFPA.
Study the edition adopted by your state. As of 2025, most states use the 2020 or 2023 NEC. These tests are written to the 2023 edition.
The most tested articles are 100 (Definitions), 200–250 (Wiring & Grounding), 300–314 (Wiring Methods), 400–411 (Conductors), 430 (Motors), and 700–701 (Emergency Systems).
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TimeProtective Relay Objective Questions Quiz — Question List
Question 2: Negative Phase sequence relay is used to protect ....... from phase to phase faults
- Generator
- Bus bar
- Transformer
- Electric Heater
Question 3: A protective relay ..............
- detects the fault location
- interrupts the fault current
- separates the electrical circuit in case of fault
- operates same as electrical fuse
Question 4: Which of the following is used to suppress the reverse polarity voltage spike in an electrical relay?
- resistor
- transistor
- FET
- MOSFET
Question 5: A de-spiking diode shall be connected in ..................... with the relay coil in electrical relay.
- series
- Parallel
Question 6: Distance relay operates on ......................
- Magnitude of voltage
- Magnitude of current
- Ratio of voltage and current
- Magnitude of reactive power
Question 7: In static relay which of the following is used to open/close the relay contacts?
- thyristor
- diode
- capacitor
- Resistor
Question 8: Buchholz relays are used to protect ..................
- Electrical Transformer
- Electrical Generator
- Electrical Bus Bar
- Electrical Motor
Question 9: Up to what power rating of Transformer Horn gap protection is applied?
- 500 KVA
- 1500 KVA
- 1000 KVA
- 2000 KVA
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