Inductance and Capacitance EFT Unit 16 Questions and Answers
Correct
Incorrect
1 of 30
Term
For a coil that has an inductance of 5H and a DC resistance of 10 Ohms:
a Calculate the L/R time constant
b. When DC voltage is first applied to this coil, approximately how long
will it take for the current to reach its maximum value?
Give this one a try later!
a. In a purely resistive circuit, voltage and current are at the same phase, which
means they rise and fall at the same time
b. While in a purely inductive load, voltage leads current because there is a counter
voltage applied through the inductor, causing the current to be out of phase.
a. It results in a greater inductance value
b. It results in less inductance
c. It results in less inductance
, It is always 180 deg out of phase along with the varying direction of current, making
current ti be pushed back in the other direction.
a. 0.5s
b. According to the L/R time constant, it would take 2.5s for the peak current
because it takes 5 time constant periods for it to be completed.
Don't know?
2 of 30
Term
State the relationship between:
a. The inductance value of a coil and the amount of cemf it produces
b. The rate of change of current through a coil and the amount of cemf
it produces
Give this one a try later!
a. The inductance value of a coil is proportional to the cemf it produces
b. The faster the rate of change of current, the great the cemf is produced
across a coil.
a. 0.5s
b. According to the L/R time constant, it would take 2.5s for the peak current
because it takes 5 time constant periods for it to be completed.
, a. It gets increased
b. It gets decreased
Self inductance occurs in the coil itself, meanwhile mutual inductance occurs when
one inductor is magnetically linked to the other and produces an induced voltage.
Don't know?
3 of 30
Term
Inductors of 1 H and 2 H are connected in series to
a 440-V, 60-Hz power supply.
a. Determine the total current flow for the circuit.
b. Repeat for the two inductors connected in parallel
to the power supply.
Give this one a try later!
a. 57.5 A
a. 3-H
b. zero
b. 0.6-H
c. 13225 W
a. 10-H
I= 1.27A
b. 2.4-H
Don't know?
Correct
Incorrect
1 of 30
Term
For a coil that has an inductance of 5H and a DC resistance of 10 Ohms:
a Calculate the L/R time constant
b. When DC voltage is first applied to this coil, approximately how long
will it take for the current to reach its maximum value?
Give this one a try later!
a. In a purely resistive circuit, voltage and current are at the same phase, which
means they rise and fall at the same time
b. While in a purely inductive load, voltage leads current because there is a counter
voltage applied through the inductor, causing the current to be out of phase.
a. It results in a greater inductance value
b. It results in less inductance
c. It results in less inductance
, It is always 180 deg out of phase along with the varying direction of current, making
current ti be pushed back in the other direction.
a. 0.5s
b. According to the L/R time constant, it would take 2.5s for the peak current
because it takes 5 time constant periods for it to be completed.
Don't know?
2 of 30
Term
State the relationship between:
a. The inductance value of a coil and the amount of cemf it produces
b. The rate of change of current through a coil and the amount of cemf
it produces
Give this one a try later!
a. The inductance value of a coil is proportional to the cemf it produces
b. The faster the rate of change of current, the great the cemf is produced
across a coil.
a. 0.5s
b. According to the L/R time constant, it would take 2.5s for the peak current
because it takes 5 time constant periods for it to be completed.
, a. It gets increased
b. It gets decreased
Self inductance occurs in the coil itself, meanwhile mutual inductance occurs when
one inductor is magnetically linked to the other and produces an induced voltage.
Don't know?
3 of 30
Term
Inductors of 1 H and 2 H are connected in series to
a 440-V, 60-Hz power supply.
a. Determine the total current flow for the circuit.
b. Repeat for the two inductors connected in parallel
to the power supply.
Give this one a try later!
a. 57.5 A
a. 3-H
b. zero
b. 0.6-H
c. 13225 W
a. 10-H
I= 1.27A
b. 2.4-H
Don't know?
