EIT Electrical Circuits 2

Question 1

In an AC circuit, inductive reactance X_L is calculated as:

Accepted Answer

2πfL

Answer

1/(2πfC)

Answer

R + jX

Answer

V/I

Question 2

What theorem states that any linear two-terminal circuit can be replaced by a single voltage source and series resistance?

Accepted Answer

Thevenin's Theorem

Answer

Norton's Theorem

Answer

Superposition Theorem

Answer

Maximum Power Transfer Theorem

Question 3

At resonance in a series RLC circuit, the impedance is:

Accepted Answer

Minimum (equal to R)

Answer

Maximum

Answer

Zero

Answer

Infinite

Question 4

What is the phase relationship between voltage and current in a pure inductor?

Accepted Answer

Voltage leads current by 90°

Answer

In phase

Answer

Current leads voltage by 90°

Answer

180° out of phase

Question 5

The turns ratio of a transformer is 10:1 (primary:secondary). If the primary voltage is 120V, what is the secondary voltage?

Accepted Answer

12 V

Answer

1200 V

Answer

120 V

Answer

240 V

Question 6

Which circuit element opposes changes in voltage?

Accepted Answer

Capacitor

Answer

Resistor

Answer

Inductor

Answer

Diode