Test: Bandwidth & Selectivity - Electrical Engineering (EE) MCQ

The SI unit for bandwidth is Hz. Hertz is the SI unit because bandwidth is basically frequency and the unit for frequency is Hz.

At the bandwidth frequency range, the value of the current is equal to the maximum value of current divided by √2.

At the bandwidth frequency range, the value of the voltage is equal to the maximum value of voltage divided by √2.

At resonance, bandwidth includes the frequency range that allows 70.2 percent of the maximum current to flow. This is because at the bandwidth frequency range, the value of the current is equal to the maximum value of current divided by √2.

At resonance, bandwidth includes the frequency range that allows 70.2 percent of the maximum voltage to flow. This is because at the bandwidth frequency range, the value of the voltage is equal to the maximum value of voltage divided by √2.

At the bandwidth frequency range, the value of the current is equal to the maximum value of current divided by √2. Hence I =50/√2= 35.36A.

At the bandwidth frequency range, the value of the voltage is equal to the maximum value of voltage divided by √2. Hence V =100/√2= 70.72V.

We know that Quality factor is equal to the resonant frequency divided by the bandwidth. Substituting the values from the given question, we get Q=10.

The bandwidth frequency range decreases as the Q factor increases because the bandwidth is inversely proportional to the Q factor.

We know that Quality factor is equal to the resonant frequency divided by the bandwidth. Substituting the values from the given question, we get BW= 5kHz.

The shape of the resonance curve depends on the Q factor because of the equation:
BW=fr/Q.

A circuit is said to be selective in nature if it has a shape peak with a narrow bandwidth.

A circuit is said to be selective in nature if it has a shape peak with a narrow bandwidth. The sharp peak indicates a high Q factor.

A circuit is said to be selective in nature if it has a shape peak with a narrow bandwidth. The sharp peak indicates a high Q factor.

 A circuit is said to be selective in nature if it has a shape peak with a narrow bandwidth. The sharp peak indicates a high Q factor.

In selective circuits, the resonant frequency lies in the mid point of the bandwidth frequency range.

For high selectivity, the Q factor should be large and for Q factor to be large, the resistance would be small because Q is inversely proportional to the resistance.

At resonance condition, the frequency is maximum since the inductive reactance is equal to the capacitive reactance and the voltage and current are in phase.

We know that Quality factor is equal to the resonant frequency divided by the bandwidth. Substituting the values from the given question, we get Q=50.

We know that Quality factor is equal to the resonant frequency divided by the bandwidth. Hence as the bandwidth increases, quality factor decreases.