Transistor Tuned Amplifiers

21. Frequencies above __________ kHz are called radio frequencies

1. 21
2. 0
3. 50
4. 200

View answer

22. If a high degree of selectivity is desired, then double-tuned circuit should have __________ coupling

1. Loose
2. Tight
3. Critical
4. None of the above

View answer

23. If L/C ratio of a parallel LC circuit is increased, the Q of the circuit __________

1. Is decreased
2. Is increased
3. Remains the same
4. None of the above

View answer

24. If Q of an LC circuit increases, then bandwidth __________

1. Increases
2. Decreases
3. Remains the same
4. Insufficient data

View answer

25. If the resistance of a tuned circuit is increased, the Q of the circuit __________

1. Is increased
2. Is decreased
3. Remains the same
4. None of the above

View answer

26. In a parallel LC circuit, if the input signal frequency is increased above resonant frequency then __________

1. XL increases and XC decreases
2. XL decreases and XC increases
3. Both XL and XC increase
4. Both XL and XC decrease

View answer

27. In a parallel LC circuit, if the signal frequency is decreased below the resonant frequency, then __________

1. XL decreases and XC increases
2. XL increases and XC decreases
3. Line current becomes minimum
4. None of the above

View answer

28. In parallel resonance, the circuit impedance is __________

1. C/LR
2. R/LC
3. CR/L
4. L/CR

View answer

29. In parallel resonance, there is __________

1. Both voltage and current amplification
2. Voltage amplifications
3. Current amplification
4. None of the above

View answer

30. In series resonance, there is __________

1. Voltage amplification
2. Current amplification
3. Both voltage and current amplification
4. None of the above

View answer