CABT Fundamentals of Electronics 2

Question 1

A capacitor is connected in series with a resistor to an AC source. As frequency increases, what happens to the capacitive reactance (Xc)?

Accepted Answer

Xc decreases

Answer

Xc increases

Answer

Xc remains constant

Answer

Xc becomes zero

Question 2

In a biomedical device, a zener diode is used primarily to:

Accepted Answer

Regulate voltage

Answer

Amplify small signals

Answer

Rectify AC to DC

Answer

Store electrical charge

Question 3

What is the time constant (τ) of an RC circuit with R = 10 kΩ and C = 100 µF?

Accepted Answer

1 second

Answer

0.1 seconds

Answer

10 seconds

Answer

100 seconds

Question 4

Which type of amplifier configuration provides both voltage gain and current gain but with a 180° phase shift?

Accepted Answer

Common emitter

Answer

Common base

Answer

Common collector

Answer

Common gate

Question 5

In an ECG machine, the CMRR (Common Mode Rejection Ratio) specification is important because it:

Accepted Answer

Rejects 60 Hz power line interference

Answer

Increases signal amplitude

Answer

Filters high-frequency noise

Answer

Amplifies differential signals only

Question 6

What is the function of a low-pass filter in biomedical signal processing?

Accepted Answer

Passes low frequencies and attenuates high frequencies

Answer

Passes high frequencies and attenuates low frequencies

Answer

Passes a specific band of frequencies

Answer

Attenuates all frequencies equally

Question 7

An op-amp in an inverting configuration has Rf = 100 kΩ and Rin = 10 kΩ. What is the voltage gain?

Accepted Answer

-10

Answer

+10

Answer

+0.1

Answer

-0.1