Q.1 What description applies to this arrangement?
b) A non-inverting force attenuator.
c) An inverting force amplifier.
d) An inverting force attenuator.
Correct Answer: An inverting force amplifier.
Q.2 What description applies to this arrangement?
b) An inverting force amplifier.
c) A non-inverting force amplifier.
d) A non-inverting force attenuator.
Correct Answer: A non-inverting force amplifier.
Q.3 Which of the following is an example of a passive electronic amplifier?
a) A resistive potential divider.
b) A step-up transformer.
c) An operational amplifier.
Correct Answer: A step-up transformer.
Q.4 What is the open-circuit output voltage of the following arrangement
b) Ro
c) Vi
d) Vo
Correct Answer:
| AoVi |
Q.5 An amplifier has a voltage gain of 20, an input resistance of 500 ohms and an output resistance of 50 ohms. The amplifier is connected to a voltage source that produces an output voltage of 1 V and has an output resistance of 75 ohms, and to a load resistance of 800 ohms. What will be the voltage across the load resistor?
a) 17.4 V.
b) 18.8 V.
c) 20 V.
d) 16.4 V.
a) 17.4 V.
b) 18.8 V.
c) 20 V.
d) 16.4 V.
Correct Answer:
| 16.4 V. |
Q.6 What is the voltage gain of the amplifier in the previous question?
a) 18.9
b) 20
c) 17.4
d) 16.4
Correct Answer:
| 18.9 |
Q.7 An amplifier has an input resistance of 1 kilohms and an output resistance of 25 ohms. The amplifier is connected to a load resistance of 100 ohms. What is the power gain of the amplifier if the input voltage is 3 V and the output voltage is 30 V?
a) 4000
b) 100
c) 1000
d) 400
Correct Answer:
| 1000 |
Q.8 What is the gain in dB corresponding to a power gain ratio of 300?
a) 49.5 dB.
b) -24.8 dB.
c) 24.8 dB.
d) 14.8 dB.
Correct Answer:
| 24.8 dB. |
Q.9 Differential amplifiers are designed to amplify common-mode signals while rejecting differential mode signals.
a) True
b) False
Correct Answer:
|
False
|
Q.10 Which of the following correctly described the characteristics of a good operational amplifier?
a) A very high voltage gain, a very high input resistance and a very high output resistance.
b) A very high voltage gain, a very high input resistance and a very low output resistance.
c) A very high voltage gain, a very low input resistance and a very high output resistance.
d) A very low voltage gain, a very high input resistance and a very high output resistance.
Correct Answer:
| A very high voltage gain, a very high input resistance and a very low output resistance. |
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