Characteristics of Operational Amplifier MCQ - Objective Question Answer for Operational Amplifier Characteristics Quiz

41. Choose the temperature-dependent parameter

A. Common mode rejection ratio
B. Voltage gain
C. Output voltage swing
D. Absolute maximum power dissipation

Answer: D

Other than absolute maximum power dissipation the remaining are frequency-dependent parameters.

42. Determine the output from the following circuit

A. 180^o in phase with an input signal
B. 180^o out of phase with an input signal
C. Same as that of an input signal
D. Output signal cannot be determined

Answer: B

The input signal is given to the inverting input terminal. Therefore, the output V_o is 180^o out of phase with input signal V₂.

43. Which of the following electrical characteristics is not exhibited by an ideal op-amp?

A. Infinite voltage gain
B. Infinite bandwidth
C. Infinite output resistance
D. Infinite slew rate

Answer: C

An ideal op-amp exhibits zero output resistance so that output can drive an infinite number of other devices.

44. An ideal op-amp requires infinite bandwidth because

A. Signals can be amplified without attenuation
B. Output common-mode noise voltage is zero
C. Output voltage occurs simultaneously with input voltage changes
D. Output can drive the infinite number of device

Answer: A

An ideal op-amp has infinite bandwidth. Therefore, any frequency signal from 0 to ∞ Hz can be amplified without attenuation.

45. Ideal op-amp has infinite voltage gain because

A. To control the output voltage
B. To obtain a finite output voltage
C. To receive zero noise output voltage
D. None of the mentioned

Answer: B

As the voltage gain is infinite, the voltage between the inverting and non-inverting terminal (i.e. differential input voltage) is essentially zero for finite output voltage.

46. Find the output voltage of an ideal op-amp. If V₁ and V₂ are the two input voltages

A. V_O = V₁-V₂
B. V_O = A × (V₁-V₂)
C. V_O = A × (V₁+V₂)
D. V_O = V₁ × V₂

Answer: B

The output voltage of an ideal op-amp is the product of gain and the algebraic difference between the two input voltages.

V_O = A × (V₁-V₂)

47. How will be the output voltage obtained for an ideal op-amp?

A. Amplifies the difference between the two input voltages
B. Amplifies individual voltages input voltages
C. Amplifies products of two input voltage
D. None of the mentioned

Answer: A

Op-amp amplifies the difference between two input voltages and the polarity of the output voltage depends on the polarity of the difference voltage.

48. Which is not the ideal characteristic of an op-amp?

A. Input Resistance –> 0
B. Output impedance –> 0
C. Bandwidth –> ∞
D. Open loop voltage gain –> ∞

Answer: A

Input resistance is infinite so almost any signal source can drive it and there is no loading of the preceding stage.

49. Find the input voltage of an ideal op-amp. It’s one of the inputs and output voltages are 2v and 12v. (Gain = 3)

A. 8v
B. 4v
C. -4v
D. -2v

Answer: D

The output voltage, V_O = (Vin₁– Vin₂)

= > 12v = 3 × (2- Vin₂)

The input voltage of an ideal op-amp is

= > Vin₂ = -2v.

50. Which factor determine the output voltage of an op-amp?

A. Positive saturation
B. Negative saturation
C. Both positive and negative saturation voltage
D. Supply voltage

Answer: C

The output voltage is proportional to the input voltage only until it reaches the saturation voltage. The output cannot exceed the positive and negative saturation voltage. These saturation voltages are specified by an output voltage swing rating of the op-amp for given values of the supply voltage.

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