# Basic electrical engineering Quality Factor mcq

#### Quality Factor mcq

The Quality Factor (Q-factor) of a resonant circuit determines:
a) The efficiency of energy transfer
b) The resistance of the circuit
c) The capacitance of the circuit
d) The inductance of the circuit

Answer: a) The efficiency of energy transfer

Explanation: The Quality Factor (Q-factor) of a resonant circuit is a measure of its energy efficiency and indicates the ratio of energy stored to energy dissipated.

The Q-factor of a resonant circuit is mathematically defined as :
a) Q = R/L
b) Q = L/R
c) Q = R/C
d) Q = C/R

A higher Q-factor indicates:
a) Higher energy loss
b) Lower energy loss
c) No energy loss
d) None of the above

The Q-factor of a resonant circuit is influenced by:
a) Resistance only
b) Inductance only
c) Capacitance only
d) All of the above

Answer: d) All of the above

The bandwidth of a resonant circuit is inversely proportional to its:
a) Q-factor
b) Resistance
c) Inductance
d) Capacitance

A high Q-factor indicates a resonant circuit with:
a) Sharp resonance
c) No resonance
d) None of the above

The Q-factor of a series resonant circuit is determined by the:
a) Resistance and inductance
b) Resistance and capacitance
c) Inductance and capacitance
d) Resistance, inductance, and capacitance

The Q-factor of a parallel resonant circuit is determined by the:
a) Resistance and inductance
b) Resistance and capacitance
c) Inductance and capacitance
d) Resistance, inductance, and capacitance

A resonant circuit with a Q-factor of 100 has a bandwidth of 1 kHz. What is the resonant frequency ?
a) 100 kHz
b) 10 kHz
c) 1 kHz
d) 0.01 kHz

Explanation : The resonant frequency can be calculated by dividing the bandwidth by the Q-factor. In this case, the resonant frequency is 1 kHz / 100 = 10 kHz.

The Q-factor of an ideal resonant circuit is:
a) Infinite
b) Zero
c) Unity
d) Indeterminate

Explanation: In an ideal resonant circuit with no energy loss, the Q-factor is considered infinite.

The Q-factor of a resonant circuit can be increased by:
a) Decreasing the resistance
b) Increasing the resistance
c) Changing the inductance
d) Changing the capacitance

The Q-factor of a resonant circuit is related to its:
a) Bandwidth
b) Resonant frequency
c) Phase shift
d) All of the aboveAnswer: d) All of the above

The Q-factor of a resonant circuit affects its:
a) Selectivity
b) Gain
c) Stability
d) All of the above

Answer: d) All of the above

A low Q-factor indicates a resonant circuit with:
a) Narrow bandwidth
b) Wide bandwidth
c) No bandwidth
d) Infinite bandwidth

The Q-factor of a resonant circuit is independent of its:
a) Voltage
b) Current
c) Power
d) Frequency

Explanation: The Q-factor of a resonant circuit is independent of the voltage across it and is determined by its physical parameters ( resistance , inductance, capacitance).

The Q-factor of a resonant circuit can be thought of as a measure of its:
a) Sensitivity
b) Impedance
c) Bandwidth
d) Efficiency

A resonant circuit with a Q-factor of 50 has a resonance peak at 2 MHz. What is the bandwidth?
a) 40 kHz
b) 80 kHz
c) 100 kHz
d) 200 kHz

Explanation: The bandwidth can be calculated by dividing the resonant frequency by the Q-factor. In this case, the bandwidth is 2 MHz / 50 = 100 kHz.

The Q-factor of a resonant circuit can be calculated by:
a) Q = ωL/R
b) Q = R/ωL
c) Q = R/ωC
d) Q = ωC/R

Explanation: The Q-factor of a resonant circuit can be calculated by dividing the resistance (R) by the angular frequency (ω) multiplied by the inductance (L).

The Q-factor of a resonant circuit is inversely proportional to its:
a) Resistance
b) Inductance
c) Capacitance
d) Both resistance and inductance

Answer: d) Both resistance and inductance

The Q-factor of a resonant circuit provides information about its:
a) Power factor
b) Energy storage capacity
c) Voltage rating
d) Phase angle