Results
Q1. In a circuit fitted with a non-trip free circuit breaker if a fault occurs and persists:
Correct answer is – if the reset button is depressed and held in, the circuit will be made
Q2. A trip free circuit breaker that has tripped due to overload:
Correct answer is – may be reset manually after fault has been cleared
Q3. Circuit breakers and fuses:
Correct answer is – are used in AC or DC circuits
Q4. A trip free circuit breaker is one which:
Correct answer is – cannot be reset by holding the lever in while the fault persists
Q5. If the reset button is pressed in the trip free circuit breaker, the contacts with the fault cleared will:
Correct answer is – be made and kept made
Q6. A circuit breaker is a device for:
Correct answer is – isolating the service on overload
Q7. A non-trip free circuit breaker is:
Correct answer is – one which can make a circuit in flight by pushing a button
Q8. A non-trip free circuit breaker that has tripped due to overload:
Correct answer is – cannot be reset while the fault is still there
Q9. A thermal circuit breaker works on the principle of:
Correct answer is – differential expansion of metals
Q10. Circuit breakers are fitted in:
Correct answer is – series with the load
Q11. A fuse is said to have blown when:
Correct answer is – a current of a higher value than the fuse rating has melted the conductor and disconnected the circuit from the supply
Q12. In a fused circuit the fuse is:
Correct answer is – in series with the load
Q13. Overloading an electrical circuit causes the fuse to ‘Blow’. This:
Correct answer is – melts the fuse wire
Q14. What must be checked before replacing a fuse?
Correct answer is – The amps capacity of the consuming device in the circuit
Q15. The size of fuse required for an electrical circuit whose power is 72 watts and whose voltage is 24 volts is:
Correct answer is – 5 amps
Q16. When selecting a fuse for an aircraft circuit the governing factor is:
Correct answer is – power requirements of the circuit
Q17. A fuse in an electrical circuit is ‘blown’ by:
Correct answer is – excess current rupturing the fuse wire
Q18. A fuse is used to protect an electrical circuit, it is:
Correct answer is – of low melting point
Q19. Fuses:
Correct answer is – protect both the circuit cable and load
Q20. A current limiter:
Correct answer is – is a fuse with a high melting point
