Question 61 : Calculate the change in current in an inductor having inductance 4000H, number of turns is 200 and the flux changes from 760 to 800 Wb.
1. 2A
2. 4A
3. 6A
4. 8A
View Answer   Discuss with Members

Question 62 : Calculate the number of turns in an inductor with a ferromagnetic core when the inductance is 4000 H, the current changes from 5A to 7A and the flux changes from 760 to 800 Wb.
1. 100
2. 200
3. 300
4. 400
View Answer   Discuss with Members

Question 63 : A laminated steel ring is wound with 200 turns. When the magnetizing current varies between 5 and 7 A, the magnetic flux varies between 760 and 800 Wb. Calculate the inductance of the coil.
1. 40H
2. 4 H
3. 4000H
4. 0.004 H
View Answer   Discuss with Members

Question 64 : What happens to the effective inductance when a ferromagnetic core is introduced?
1. Increases
2. Decreases
3. Remains the same
4. Becomes zero
View Answer   Discuss with Members

Question 65 : What is the relation between the flux and the magnetizing current when a ferromagnetic core is introduced within the inductor?
1. Directly proportional
2. Inversely proportional
3. Not proportional
4. Current is double of flux
View Answer   Discuss with Members

Question 66 : What happens to the current when a ferromagnetic material is introduced within an inductor?
1. Increases
2. Decreases
3. Remains the same
4. Becomes zero
View Answer   Discuss with Members

Question 67 : When a ferromagnetic core is inserted into an inductor, what happens to the flux linkage?
1. Increases
2. Decreases
3. Remains the same
4. Becomes zero
View Answer   Discuss with Members

Question 68 : If the current changes from 20A to 10A in 5 seconds and the value of inductance is 1H, calculate the emf induced.
1. 8V
2. 6V
3. 4V
4. 2V
View Answer   Discuss with Members

Question 69 : What happens to the inductance as the length of the magnetic circuit increases?
1. Increases
2. Decreases
3. Remains the same
4. Becomes zero
View Answer   Discuss with Members

Question 70 : What happens to the inductance as the area of the cross section of the coil increases?
1. Increases
2. Decreases
3. Remains the same
4. Becomes zero
View Answer   Discuss with Members