Question 71 : When the coil is wrapped around a ferromagnetic core, why is it difficult to determine the inductance?
1. The variation of flux is no longer proportional to the variation of current
2. Current does not exist in the coil
3. Flux does not exist in the coil
4. The value of current is too large to measure
View Answer   Discuss with Members

Question 72 : What happens to the inductance when the current in the coil becomes double its original value?
1. Becomes half
2. Becomes four times
3. Becomes double
4. Remains same
View Answer   Discuss with Members

Question 73 : What happens to the inductance when the magnetic field strength decreases?
1. Increases
2. Decreases
3. Remains the same
4. Becomes zero
View Answer   Discuss with Members

Question 74 : As the number of turns in the coil increases, what happens to the inductance of the coil?
1. Increases
2. Decreases
3. Remains the same
4. Becomes zero
View Answer   Discuss with Members

Question 75 : If the current changes from 3A to 5A in 2s and the emf is 10V. Calculate the inductance.
1. 10H
2. 20H
3. 30H
4. 40H
View Answer   Discuss with Members

Question 76 : If the current changes from 5A to 3A in x sec and inductance is 10H. The emf is 10V, calculate the value of x.
1. 2s
2. 3s
3. 4s
4. 5s
View Answer   Discuss with Members

Question 77 : If the current changes from 5A to 3A in 2 seconds and the inductance is 10H, calculate the emf.
1. 5V
2. 10V
3. 15V
4. 20V
View Answer   Discuss with Members

Question 78 : If either the inductance or the rate of change of current is doubled, the induced e.m.f?
1. Remains constant
2. Becomes zero
3. Doubles
4. Becomes half
View Answer   Discuss with Members

Question 79 : The unit for inductance is ___________
1. Ohm
2. Henry
3. A/m
4. A/s
View Answer   Discuss with Members

Question 80 : For a coil having a magnetic circuit of constant reluctance, if the flux increases, what happens to the current?
1. Increases
2. Decreases
3. Remains constant
4. Becomes zero
View Answer   Discuss with Members