Question 41 : Which of the following class have a theoretical efficiency of 50%?
1. Class A
2. Class C
3. Class AB
4. Class D
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Question 42 : Which of the following amplifier is less efficient than others?
1. Class C
2. Class B
3. Class A
4. Class AB
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Question 43 : Which of the following amplifier cannot be used for audio frequency amplification?
1. Class A
2. Class C
3. Class AB
4. Class B push-pull
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Question 44 : Which of the following class has poorest linearity
1. Class A
2. Class B
3. Class C
4. Class AB
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Question 45 : Which of the following letter is not used to represent a class?
1. D
2. E
3. C
4. K
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Question 46 : Which of the following amplifier class have highest linearity and lowest distortion?
1. Class A
2. Class B
3. Class C
4. Class B push-pull
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Question 47 : The power rating of the amplifier is 100watts then the transistor can only operate at ___________
1. Power higher than 100w
2. Power lower than 100w
3. Power near to 100w
4. Power lower than 200W
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Question 48 : Which of the following audio speaker will be hard to be driven by a power amplifier?
1. 4ohm
2. 8ohm
3. 12ohm
4. 2ohm
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Question 49 : For a perfect power amplifier output power rating will be ________ if the output impedance is halved.
1. Halved
2. Squared
3. Doubled
4. Square rooted
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Question 50 : Transistor in power amplifier is ___________
1. An active device
2. A passive device
3. A op-amp
4. A voltage generating device
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