Fuses - MCQs with answersQ1. Which among these are the main characteristics of a fuse element?
a. Low melting point
b. High conductivity
c. Least deterioration due to oxidation
d. All of the aboveView Answer / Hide Answer
Q2. Which among the following statement is true related to fuse?
ANSWER: d. All of the above
a. Greater the current smaller is the time taken by the fuse to blow out.
b. Greater the current greater is the time taken by the fuse to blow out.
c. The current is directly proportion to the blow out time of fuse.
d. Is dependent on the temperature and atmospheric conditions.View Answer / Hide Answer
Q3. Which among these is the least expensive protection for over current in low voltage system?
ANSWER: a. Greater the current smaller is the time taken by the fuse to blow out.
a. Rewirable fuse.
c. Circuit breaker.
d. Air breaker switch.View Answer / Hide Answer
Q4. For a current upto 10A which material is used as the fusing element?
ANSWER: a. Rewirable fuse.
c. Alloy of lead and tin
d. ZincView Answer / Hide Answer
Q5. What is the relation between the fusing current and the diameter of the wire?
ANSWER: c. Alloy of lead and tin
a. I = k d3
b. I = k d3/2
c. I = k d2
d. I = k d2/3View Answer / Hide AnswerQ6. What is fusing factor?
a. The ratio of current rating of the fuse to the minimum fusing current.
b. The ratio of minimum fusing current to the current rating of the fuse.
c. The ratio of maximum fusing current to the current rating of the fuse.
d. The ratio of minimum fusing current to the voltage rating of the fuseView Answer / Hide Answer
Q7. What should be the value of fusing factor?
ANSWER: b. The ratio of minimum fusing current to the current rating of the fuse.
a. Equal to zero
b. Equal to one
c. Less than one
d. More than oneView Answer / Hide AnswerQ8. What is the maximum current upto which fuses can be used?
a. 25 A
b. 50 A
c. 75 A
d. 100 AView Answer / Hide AnswerQ9. What is the typical value of the pre arcing time?
d. 0.0001View Answer / Hide AnswerQ10. A fuse wire of circular cross section has a radius of 0.8mm. The wire blows off at a current of 9A. What will be the radius of the wire that will blow off at a current of 1A?
a. 0.2 mm
b. 0.18 mm
c. 0.28 mm
d. 0.3 mmView Answer / Hide Answer