CEP Electrical Theory & Principles 2

Question 1

In a purely inductive AC circuit, the current lags the voltage by how many degrees?

Accepted Answer

90 degrees

Answer

In a purely inductive circuit, current lags voltage by exactly 90 degrees due to the inductor's opposition to changes in current.

Question 2

Which law states that the algebraic sum of all currents entering and leaving a node equals zero?

Accepted Answer

Kirchhoff's Current Law

Answer

Kirchhoff's Current Law (KCL) states that charge conservation requires all currents at a node to sum to zero.

Question 3

The time constant of an RC circuit is defined as:

Accepted Answer

R × C

Answer

The RC time constant τ = R × C represents the time for the capacitor to charge to approximately 63.2% of the supply voltage.

Question 4

What is the equivalent resistance of two 10 Ω resistors connected in parallel?

Accepted Answer

5 Ω

Answer

For equal resistors in parallel, the equivalent resistance is R/n = 10/2 = 5 Ω.

Question 5

Fleming's left-hand rule is used to determine the direction of:

Accepted Answer

Force on a current-carrying conductor in a magnetic field

Answer

Fleming's left-hand rule relates the directions of magnetic field, current, and mechanical force on a motor conductor.

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