Saturday, 5 May 2012

Amplification


Q.1 What description applies to this arrangement?

ch03q01.gif
a) A non-inverting force amplifier.
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?
  ch03q02.gif
a) An inverting force attenuator.
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
  ch03q04.gif
a) AoVi
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.

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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