## Quiz sheet for RLC series circuits

In a right angle triangle, the ratio of adjacent side to hypotenuse is the

A) cosine

B) tangent

C) sine

D) resultant

ANSWER: A

If a series RLC circuit is operating at resonance, the current is:

A) is maximum

B) is minimum

C) determined by the capacitor

D) determined by the inductor

ANSWER: A

Resonance occurs in an RLC series circuit when the:

A) inductive reactance is equal to th capacitive reactance

B) inductance is equal to the capacitance

C) impedance is maximum

D) power is minimum

ANSWER: A

When resonance occurs in a series circuit, the impedance is equal to the:

A) total resistance

B) total reactance

C) inductive reactance

D) capacitive reactance

ANSWER: B

The resultant of two or more voltages differing in phase angle may be determined by

A) phasor addition

B) averaging the values

C) adding numerically

D) algebraic addition

ANSWER: A

A & B are two voltages of 150 and 200 volts respectively, with an angle of phase difference of 90 degrees. When added, the resultant voltage is

A) 250 volts

B) 350 volts

C) 50 volts

D) -50 volts

ANSWER: A

If a series resonant circuit with a low value of resistance is connected to an a.c. supply, a problem may occur with:

A) high voltage across the capacitor or the inductor

B) high supply voltage

C) high power factor

D) capacitor current too low

ANSWER: A

The current in an a.c. circuit that has resistance and inductance in series will:

A) lag the applied voltage by an angle between 0 and 90 degrees

B) lead the applied voltage by an angle between 90 and 180 degrees

C) always be in phase with the applied voltage

D) lag the voltage by exactly 90 degrees

ANSWER: A

As applied frequency on a capacitor increases, the capacitive reactance

A) decreases

B) increases

C) is unchanged

D) acts to changed applied frequency

ANSWER: A

In a series a.c. circuit containing resistance, inductance and capacitance, an increase in resistance will result in:

A) increased power factor

B) decreased power factor

C) increased angle of phase difference

D) increased current

ANSWER: A