Electrical Engineering - Voltage, Current and Resistance - Discussion
Discussion Forum : Voltage, Current and Resistance - General Questions (Q.No. 25)
25.
The current in a given circuit is not to exceed 24 A. Which value of fuse is best?
Discussion:
20 comments Page 1 of 2.
Haris said:
5 years ago
For 24A Current we cannot use 24 A Fuse.
Let's understand this concept:
P=IV => 24A*230V= 5,520W
P=IV => 25A*230V= 5750W.
According to a selection of fuse Parameters:
For Power Rating less than 5520W we can use 24A Fuse.
But for power rating Greater than and equal to 5520W, we would use a fuse rating greater than 24A like 25A fuse.
Let's understand this concept:
P=IV => 24A*230V= 5,520W
P=IV => 25A*230V= 5750W.
According to a selection of fuse Parameters:
For Power Rating less than 5520W we can use 24A Fuse.
But for power rating Greater than and equal to 5520W, we would use a fuse rating greater than 24A like 25A fuse.
(6)
Sakthiraja m said:
7 years ago
24A is correct because in the faulty condition the current flow in the circuit is above 24A. So it situation we choose 20A fuse the circuit will damage so when a current value is 24A means the fuse will be selected at above 24A is the best one.
NEELADURGARAO said:
1 decade ago
every safety equipment having have some safety factor and fusing factor
i.e.,
every fuse having fusing factor it is 1.2 % of rated current
if u connect a 24 amp fuse wire it will break up load is 29 amps
there fore the answer is D
i.e.,
every fuse having fusing factor it is 1.2 % of rated current
if u connect a 24 amp fuse wire it will break up load is 29 amps
there fore the answer is D
Lester said:
1 decade ago
According to electrical code 80% shall be used in protecting the branch circuit, the circuit has not exceeding 24 A therefore I choose 20 A not a 24 A. Having a 24 A into not exceeding means that circuit may less or more 23 A,
V.ganapathy sundaram said:
1 decade ago
The fuse value should be 1, 2, 3, 4, and 5 ohms further it should be incremented by 5's so after 5 ohm fuse we should use 10, 15, 20, 25, . So the answer is 25. (because the fuse value should be above the current value).
T.Ramachandran said:
9 years ago
Fuse is used as a protective device. Here we have to permit current up to 24A. So the fuse should permit the current up to 24A and beyond that the fuse should get melt and circuit get broken.
Shrijith jain said:
8 years ago
As mentioned in the question that not to exceed above 24 amps so suitable option is 'D'. But the rating of any fuse is calculated as below.
Fuse rating = (Power/Voltage) x 125%.
Fuse rating = (Power/Voltage) x 125%.
(1)
Shrijith jain said:
8 years ago
As mentioned in the question that not to exceed above 24 amps so suitable option is 'D'. But the rating of any fuse is calculated as below.
Fuse rating = (Power/Voltage) x 125%.
Fuse rating = (Power/Voltage) x 125%.
Arun crackbrains said:
1 decade ago
The best option is 20A. Because. A 24A fuse will not break at 24. And also it is good for the circuit to keep the current somewhat below max related current.
(1)
Gautam said:
1 decade ago
The best option is 20A. Because. A 24A fuse will not break at 24. And also it is good for the circuit to keep the current somewhat below max related current.
(1)
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers