Question 1: A differential relay acts on the principle of difference between which of the following electrical quantities?
- voltage
- current
- impadance
- any one
BASIC
NEC 2023
Protective Relay Objective Questions Quiz
Free online quiz on Protective Relay objective questions.
TOPICS COVERED
Electrical Practice Questions
How this test works
Read each question carefully
Look for absolute words like always / never — they often distinguish the right answer.
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How to Use This Practice Test
This Protective Relay Objective Questions Quiz has 9 questions with detailed answers and NEC references. Take the full test, review every wrong answer, and look up the NEC article it references before moving on.
Tip: Work through Ohm's Law problems on paper — don't just read the answers, calculate them yourself.
- Topics covered: Voltage, current, resistance, Ohm's Law, series/parallel circuits, and electrical safety.
- Passing score: Aim for 90%+ on basic theory — these fundamentals underpin every advanced topic.
- Questions: 9 multiple-choice, one correct answer each
9
Questions
14 min
Time
70%
Pass
Timer starts immediately. Progress is auto-saved.
Protective 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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