# Basic Electrical Engineering Questions and Answers – Selectivity

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This set of Basic Electrical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Selectivity”.

1. Shape of the resonance curve depends upon the?
a) Q-factor
b) Voltage
c) Current
d) Either voltage or current

Explanation: The shape of the resonance curve depends on the Q factor because of the equation:
Q=Resonance frequency / Bandwidth. Sharp resonance means high quality factor.

2. A circuit is said to be selective if it has a _____ peak and ____ bandwidth.
a) Blunt, narrow
b) Sharp, narrow

Explanation: For a circuit to be selective, it should have high quality factor. And we know that for high quality factor, resonance frequency should be high(peak should be sharp) and bandwidth should be narrow.

3. What is the Q factor of a selective circuit?
a) Very low
b) Very high
c) Zero
d) Infinity

Explanation: For a circuit to be selective, it should have high quality factor. It should have a sharp peak with narrow bandwidth.
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4. In selective circuits, higher the Q factor _________ the peak.
a) Sharper
b) Blunter
c) Neither sharper nor blunter
d) Either sharper or blunter

Explanation: Q=Resonance frequency / Bandwidth.
Higher the quality factor, sharper the peak of resonance curve.

5. Q is a measure of _________
a) Resonance
b) Bandwidth
c) Selectivity
d) Either resonance or bandwidth

Explanation: For a circuit to be selective, it should have a high quality factor. It should have a sharp peak with narrow bandwidth.

6. In selective circuits, the resonant frequency lies in the ________ of the bandwidth frequency range.
a) Beginning
b) End
c) Midpoint
d) Cannot be determined

Explanation: In selective circuits, the resonant frequency lies in the midpoint of the bandwidth frequency range.

7. In order for high selectivity, the resistance must be?
a) Small
b) Large
c) Negative
d) Positive

Explanation: 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.

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