Question: Power amplifiers generally use transformer coupling because transformer permits______________?

• 1. Cooling of the circuit
• 2. Impedance matching
• 3. Distortionless output
• 4. Good frequency response

Question: The most important consideration in power amplifier is __________________?

• 1. Biasing the circuit
• 2. Collector efficiency
• 3. To keep the transformer cool
• 4. None of the above

Question: A transformer coupled class A power amplifier has a load of 100 O on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?

• 1. 5 kO
• 2. 20 kO
• 3. 100 kO
• 4. 10 kO

Question: Transformer coupling can be used in______________amplifiers?

• 1. Either power or voltage
• 2. Only power
• 3. Only voltage
• 4. None of the above

Question: An AF amplifier is shielded to ________________?

• 1. Keep the amplifier cool
• 2. Protect from rusting
• 3. Prevent induction due to stray magnetic fields
• 4. None of the above

Question: The disadvantage of impedance matching is that it _______________?

• 1. Gives distorted output
• 2. Gives low power output
• 3. Requires a transformer
• 4. None of the above

Question: The most costly coupling is _______________ coupling?

• 1. RC
• 2. Direct
• 3. Impedance
• 4. Transformer

Question: A class A power amplifier uses _________________?

• 1. Two transistors
• 2. Three transistors
• 3. One transistor
• 4. None of the above

Question: The output stage of a multistage amplifier is also called _________________-?

• 1. Mixer stage
• 2. Power stage
• 3. Detector stage
• 4. F stage

Question: Class_____________ power amplifier has the highest collector efficiency ?

• 1. C
• 2. A
• 3. B
• 4. AB