Question 1: An electrical fuse is a
- Protective device
- voltage limiting device
- current limiting device
- current controlling device
NEC CODE
NEC 2023
Electrical fuse Practice test
Free Practice test Electrical fuse Question and answers
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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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TimeElectrical fuse Practice test — Question List
Question 2: In an electrical circuit the fuse is used to ...................
- detect the fault only
- protect the circuit from fault
- minimize the fault only
- detect and protect the circuit
Question 3: The breaking capacity of an electrical fuse compared to circuit breaker is ...............
- less
- more
- same
Question 4: The operating time of an electrical fuse is about ...................
- 0.002 sec
- 1 sec
- 0.8 sec
- 1.5 sec
Question 5: Which of the following is the time current graph of an electrical fuse?
- linear characteristic
- inverse characteristic
- straight line
- parabola
Question 6: An electrical fuse should have high melting point.
- True
- False
Question 7: Which of the following fuse diameter will be high , 10 A fuse or 5 A fuse?
- 10 A
- 5 A
- both are same
Question 8: Which following device only detects the fault in an electrical circuit?
- fuse
- circuit breaker
- isolator
- relay
Question 9: If the current rating of a fuse is 10 A the fusing current will be ..............
- 10 A
- more than 10 A
- less than 10 A
- 5 A
Question 10: If the maximum over current in a circuit should be 5 A. what should be the fuse rating?
- 5A
- less than 5 A
- more than 5A
- 2.5 A
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