NETA AC/DC Theory and Circuits 3

Question 1

In a parallel RLC circuit at resonance, the circuit impedance is:

Accepted Answer

At its maximum value

Answer

In a parallel RLC circuit at resonance, the impedance is at its maximum value, and the line current is at its minimum.

Question 2

Kirchhoff's Voltage Law (KVL) states that:

Accepted Answer

The algebraic sum of all voltages around any closed loop equals zero

Answer

KVL: The algebraic sum of all voltage drops and rises around any closed loop in a circuit equals zero.

Question 3

The impedance of a capacitor at DC (0 Hz) is:

Accepted Answer

Infinite (open circuit)

Answer

At DC (zero frequency), XC = 1/(2*pi*f*C). As f approaches zero, XC approaches infinity. A capacitor blocks DC and appears as an open circuit.

Question 4

When resistors are connected in parallel, the total resistance is:

Accepted Answer

Less than the smallest individual resistance

Answer

For parallel resistors, 1/R_total = 1/R1 + 1/R2 + ... The total resistance is always less than the smallest individual resistance.

Question 5

The unit of inductance is the Henry (H), which is defined as:

Accepted Answer

One volt-second per ampere

Answer

One Henry is defined as the inductance that produces an EMF of 1 volt when the current changes at a rate of 1 ampere per second. So 1 H = 1 V per (A/s) = 1 V*s/A.

(NETA) InterNational Electrical Testing Association Certified Technicians Practice Test

(NETA) InterNational Electrical Testing Association Certified Technicians Practice Test

NETA AC/DC Theory and Circuits 3