Inductance 1

If a coil of wire has an inducatnce of 30uH which of these is likely to be its inductance when a ferrite rod is inserted into the coil?
1. 30uH
2. 39uH
3. 29uH
4. 29mH
Which of these is likely to lead to an increase in the inductance of a coil wound on a ferrite rod?
1. Moving the turns further appart
2. Increasing the number of turns
3. decreasing the diameter of the coil
4. Removing the ferrite rod
When DC current is allowed to flow through a resitor to an inductor which of these is the best description of changes in current flow?
1. The current increase in a linear (straight line) pattern until full current is flowing.
2. The current will increase in an exponential curve (rapid increase which slows down as a maximum flow is reached)
3. The current will rise immediately to a high level and then level off.
4. The current will show a sinusoidal change a the DC is applied
Which of these is NOT the function of a slug tuned coil?
1. To increase the frequency stability of the coil when used in a tuned circuit.
2. To allow the inductance of the coil to be decreased when a slug with a permeability of less than 1 is used
3. To allow the inductance of the coil to be increased when a slug with a permeability of greater than 1 is used
4. To reduce the size of the coil when using a ferrite slug
Which of these is the nearest combined value of the 5 inductors shown in the diagram?
1. 44uH
2. 20uH
3. 24uH
4. 16uH