CET AC Circuit Analysis & Power 3

Question 1

The skin effect in AC conductors causes current to concentrate at the:

Accepted Answer

Outer surface of the conductor

Answer

Center of the conductor

Answer

Midpoint between center and surface

Answer

Negative half of the conductor

Question 2

In a parallel RLC circuit, what condition defines resonance?

Accepted Answer

Susceptances cancel and total current is minimum

Answer

Total admittance is maximum

Answer

Current through R equals current through L

Answer

Impedance equals zero

Question 3

What is the RMS value of a sine wave with a peak voltage of 170 V?

Accepted Answer

120.2 V

Answer

85 V

Answer

240 V

Answer

170 V

Question 4

Power factor correction in industrial facilities is most commonly achieved by adding:

Accepted Answer

Capacitor banks in parallel with inductive loads

Answer

Resistors in parallel with the load

Answer

Inductors in series with capacitive loads

Answer

Transformers across the supply

Question 5

In an AC circuit, complex power S is expressed as:

Accepted Answer

S = P + jQ

Answer

S = V × I

Answer

S = P − jQ

Answer

S = P / Q

Question 6

What is the bandwidth of a series resonant circuit with f0 = 10 kHz and Q = 50?

Accepted Answer

200 Hz

Answer

500 Hz

Answer

5 kHz

Answer

50 kHz

Question 7

Which waveform has an RMS value equal to its average value?

Accepted Answer

Square wave

Answer

Sine wave

Answer

Triangle wave

Answer

Sawtooth wave