1 $Which component is primarily used to select or reject a specific range of frequencies in an electronic circuit?$

A.

Transformer

B.

Filter

C.

Rectifier

D.

Oscillator

2 $An ideal low-pass filter allows signals to pass through it if their frequency is:$

A.

Exactly equal to the resonance frequency

B.

Lower than the cut-off frequency

C.

Within a specific high-frequency band

D.

Higher than the cut-off frequency

3 $What is the formula for the cut-off frequency () of a simple RC filter?$

A.

B.

C.

D.

4 $A high-pass filter can be constructed by swapping the position of the resistor and capacitor in which circuit?$

A.

Bridge rectifier

B.

Band-pass filter

C.

Voltage follower

D.

Low-pass filter

5 $Which filter type passes frequencies within a certain range and rejects frequencies outside that range?$

A.

All-pass filter

B.

Band-pass filter

C.

Low-pass filter

D.

High-pass filter

6 $In the context of filters, what does the term 'Stopband' refer to?$

A.

The phase shift of the signal

B.

The frequency where gain is 0 dB

C.

The range of frequencies that are attenuated

D.

The range of frequencies that are allowed to pass

7 $What is the ideal input impedance of an operational amplifier?$

A.

B.

Infinite ()

C.

Zero ()

D.

8 $What is the ideal output impedance of an operational amplifier?$

A.

B.

Zero ()

C.

D.

Infinite ()

9 $The open-loop voltage gain () of an ideal op-amp is:$

A.

100

B.

1

C.

Infinite ()

D.

0

10 $Common Mode Rejection Ratio (CMRR) is the ratio of:$

A.

Output voltage to Input voltage

B.

Common mode gain to Differential gain

C.

Differential gain to Common mode gain

D.

Input impedance to Output impedance

11 $Which parameter defines the maximum rate of change of the output voltage per unit of time?$

A.

Offset Voltage

B.

CMRR

C.

Bandwidth

D.

Slew Rate

12 $The concept of 'Virtual Ground' is primarily applicable to which op-amp configuration?$

A.

Positive feedback oscillator

B.

Voltage follower without feedback

C.

Inverting amplifier with negative feedback

D.

Open-loop comparator

13 $Why does the concept of virtual ground exist in an ideal op-amp?$

A.

Because the output impedance is infinite

B.

Because the input impedance is zero

C.

Because the slew rate is zero

D.

Because the open-loop gain is infinite

14 $In an ideal op-amp circuit, the current entering the input terminals (and) is considered to be:$

A.

Depends on the input voltage

B.

Zero

C.

Infinite

D.

1 Ampere

15 $What is the voltage gain () of an inverting amplifier with feedback resistor and input resistor ?$

A.

B.

C.

D.

16 $The phase shift introduced by an inverting op-amp configuration is:$

A.

B.

C.

D.

17 $What is the voltage gain () of a non-inverting amplifier?$

A.

B.

C.

D.

18 $If and in an inverting amplifier, what is the gain?$

A.

6

B.

-5

C.

-0.2

D.

5

19 $If and in a non-inverting amplifier, what is the gain?$

A.

0

B.

-1

C.

2

D.

1

20 $Which op-amp configuration acts as a 'Voltage Follower' or 'Unity Gain Buffer'?$

A.

Non-inverting amplifier with and

B.

Inverting amplifier with

C.

Differentiator

D.

Summing amplifier

21 $What is the primary advantage of a Voltage Follower circuit?$

A.

It inverts the signal phase

B.

It acts as an impedance matching buffer (high, low)

C.

It filters out low frequencies

D.

It amplifies voltage significantly

22 $An op-amp summing amplifier (adder) is typically based on which configuration?$

A.

Open-loop configuration

B.

Voltage follower

C.

Inverting configuration

D.

Comparator

23 $In an inverting summing amplifier with three inputs and all resistors equal (), the output voltage is:$

A.

B.

C.

D.

24 $To convert a summing amplifier into an averaging amplifier for 3 inputs, the ratio should be:$

A.

1

B.

3

C.

Infinite

D.

25 $An op-amp subtractor (difference amplifier) produces an output proportional to:$

A.

The difference between the two input voltages

B.

The integral of the input voltage

C.

The sum of the two input voltages

D.

The product of the two input voltages

26 $In a basic differential amplifier (subtractor) circuit, if all external resistors are equal, the output voltage is:$

A.

B.

C.

D.

27 $Which op-amp circuit performs the mathematical operation of integration?$

A.

Comparator

B.

Adder

C.

Differentiator

D.

Integrator

28 $In an ideal op-amp integrator circuit, the feedback element is a:$

A.

Inductor

B.

Diode

C.

Resistor

D.

Capacitor

29 $If a constant DC voltage is applied to the input of an ideal op-amp integrator, the output will be:$

A.

A constant DC voltage

B.

A ramp voltage (linear increase/decrease)

C.

A sine wave

D.

Zero

30 $The output voltage of an ideal integrator is given by:$

A.

B.

C.

D.

31 $In an op-amp differentiator circuit, the input element is a__and the feedback element is a__.$

A.

Capacitor, Capacitor

B.

Resistor, Resistor

C.

Capacitor, Resistor

D.

Resistor, Capacitor

32 $If the input to an ideal differentiator is a triangular wave, the output will be:$

A.

A cosine wave

B.

A square wave

C.

A triangular wave

D.

A sine wave

33 $A major practical disadvantage of the ideal differentiator circuit is:$

A.

It has very low input impedance

B.

It amplifies high-frequency noise

C.

It blocks DC signals

D.

It cannot be built with standard components

34 $When an op-amp is used as a comparator, it typically operates in which mode?$

A.

Open-loop (no feedback)

B.

Closed-loop with negative feedback

C.

Unity gain mode

D.

Active region

35 $In a comparator circuit, if the voltage at the non-inverting input () is greater than the voltage at the inverting input (), the output goes to:$

A.

B.

Positive Saturation ()

C.

Negative Saturation ()

D.

36 $Which application is a primary use of an op-amp comparator in Anti-lock Braking Systems (ABS)?$

A.

Converting wheel speed sensor signals to digital pulses

B.

Integrating the brake pressure

C.

Amplifying the audio signal for the driver

D.

Differentiation of the steering angle

37 $In an ABS system, the comparator typically compares the wheel speed sensor signal against:$

A.

The output of the alternator

B.

The battery voltage

C.

The engine temperature

D.

A fixed reference voltage (e.g., Ground)

38 $Why is negative feedback generally NOT used in a simple comparator circuit?$

A.

It is used; this statement is false

B.

It reduces the gain too much

C.

It slows down the switching speed

D.

It creates instability

39 $What happens if a differentiator input is a sine wave: ?$

A.

B.

is zero

C.

D.

40 $In a practical integrator, a resistor is often placed in parallel with the feedback capacitor to:$

A.

Increase the slew rate

B.

Increase the bandwidth

C.

Reduce the gain at low frequencies (prevent saturation due to offsets)

D.

Convert it to a differentiator

41 $Bandwidth of an ideal op-amp is:$

A.

B.

Infinite

C.

Finite

D.

42 $What is the slope of the frequency response roll-off for a first-order Low-pass RC filter?$

A.

B.

C.

D.

43 $Which component determines the 'order' of a passive filter?$

A.

The voltage source

B.

The load resistance

C.

The resistor value

D.

The number of reactive components (Capacitors/Inductors)

44 $An op-amp usually requires which type of power supply?$

A.

Current source only

B.

Single AC source

C.

High voltage AC

D.

Dual polarity DC supply (and)

45 $In an inverting amplifier, if the input signal is peak-to-peak sine wave and gain is -2, the output is:$

A.

peak-to-peak sine wave

B.

peak-to-peak sine wave, in phase

C.

peak-to-peak sine wave

D.

peak-to-peak sine wave, phase shifted

46 $Which of the following is NOT a property of an ideal Op-Amp?$

A.

Infinite Open Loop Gain

B.

Infinite Bandwidth

C.

Infinite Input Impedance

D.

Infinite Output Impedance

47 $In an ABS system, if a wheel locks up (stops rotating), the frequency of the pulses from the wheel speed sensor (processed by the comparator) will:$

A.

Invert polarity

B.

Remain constant

C.

Drop to zero

D.

Increase to infinity

48 $A Band-pass filter is effectively a cascade combination of:$

A.

An integrator and a differentiator

B.

Two Low-pass filters

C.

Two High-pass filters

D.

A High-pass filter and a Low-pass filter (with overlapping passbands)

49 $In a non-inverting amplifier, the input signal is applied to:$

A.

The feedback resistor

B.

The inverting terminal (-)

C.

The output terminal

D.

The non-inverting terminal (-)

50 $The voltage at the non-inverting input of an inverting amplifier (connected to ground) is:$

A.

B.

C.

D.

Unit 5 - Practice Quiz