## Multiple Choice Questions and Answers on Transistor Tuned Amplifiers

**Q1. A tuned amplifier uses ……………. load**

- Resistive
- Capacitive
- LC tank
- Inductive

**Answer : 3**

**Q2. A tuned amplifier is generally operated in ……………. operation**

- Class A
- Class C
- Class B
- None of the above

**Answer : 2**

**Q3. A tuned amplifier is used in …………… applications**

- Radio frequency
- Low frequency
- Audio frequency
- None of the above

**Answer : 1**

**Q4. Frequencies above …………… kHz are called radio frequencies**

- 2
- 10
- 50
- 200

**Answer : 4**

**Q5. At series or parallel resonance, the circuit power factor is …………..**

- 0
- 5
- 1
- 8

**Answer : 3**

**Q6. The voltage gain of a tuned amplifier is ……………. at resonant frequency**

- Minimum
- Maximum
- Half-way between maximum and minimum
- Zero

**Answer : 2**

**Q7. At parallel resonance, the line current is ……………….**

- Minimum
- Maximum
- Quite large
- None of the above

**Answer : 1**

**Q8. At series resonance, the circuit offers …………….. impedance**

- Zero
- Maximum
- Minimum
- None of the above

**Answer : 3**

**Q9. A resonant circuit contains ……………… elements**

- R and L only
- R and C only
- Only R
- L and C

**Answer : 4**

**Q10. At series or parallel resonance, the circuit behaves as a …………….. load**

- Capacitive
- Resistive
- Inductive
- None of the above

**Answer : 2**

**Q11. At series resonance, voltage across L is ………………. voltage across C**

- Equal to but opposite in phase to
- Equal to but in phase with
- Greater than but in phase with
- Less than but in phase with

**Answer : 1**

**Q12. When either L or C is increased, the resonant frequency of LC circuit ……………**

- Remains the same
- Increases
- Decreases
- Insufficient data

**Answer : 3**

**Q13. At parallel resonance, the net reactive component circuit current is …………**

- Capacitive
- Zero
- Inductive
- None of the above

**Answer : 2**

**Q14. In parallel resonance, the circuit impedance is …………..**

- C/LR
- R/LC
- CR/L
- L/CR

**Answer : 4**

**Q15. In a parallel LC circuit, if the input signal frequency is increased above resonant frequency then …………………..**

- X
_{L}increases and X_{C}decreases - X
_{L}decreases and X_{C}increases - Both X
_{L}and X_{C}increase - Both X
_{L}and X_{C}decrease

**Answer : 1**

**Q16. The Q of an LC circuit is given by ………………….**

- 2πf
_{r}x R - R / 2πf
_{r}L - 2πf
_{r}L / R - R
^{2}/2πf_{r}L

**Answer : 3**

**Q17. If Q of an LC circuit increases, then bandwidth …………………**

- Increases
- Decreases
- Remains the same
- Insufficient data

**Answer : 2**

**Q18. At series resonance, the net reactive component of circuit current is ……………….**

- Zero
- Inductive
- Capacitive
- None of the above

**Answer : 1**

**Q19. The dimensions of L/CR are that of …………….**

- Farad
- Henry
- Ohm
- None of the above

**Answer : 3**

**Q20. If L/C ratio of a parallel LC circuit is increased, the Q of the circuit ……………..**

- Is decreased
- Is increased
- Remains the same
- None of the above

**Answer : 2**

**Q21. At series resonance, the phase angle between applied voltage and circuit is ………..**

- 90
^{o} - 180
^{o} - 0
^{o} - None of the above

**Answer : 3**

**Q22. At parallel resonance, the ratio L/C is …………….**

- Very large
- Zero
- Small
- None of the above

**Answer : 1**

**Q23. If the resistance of a tuned circuit is increased, the Q of the circuit ………….**

- Is increased
- Is decreased
- Remains the same
- None of the above

**Answer : 2**

**Q24. The Q of a tuned circuit refers to the property of …………..**

- Sensitivity
- Fidelity
- Selectivity
- None of the above

**Answer : 3**

**Q25. At parallel resonance, the phase angle between the applied voltage and circuit current is …………….**

- 90
^{o} - 180
^{o} - 0
^{o} - None of the above

**Answer : 3**

**Q26. In a parallel LC circuit, if the signal frequency is decreased below the resonant frequency, then ……………**

- X
_{L}decreases and X_{C}increases - X
_{L}increases and X_{C }decreases - Line current becomes minimum
- None of the above

**Answer : 1**

**Q27. In series resonance, there is ………………**

- Voltage amplification
- Current amplification
- Both voltage and current amplification
- None of the above

**Answer : 1**

**Q28. The Q of a tuned amplifier is generally …………….**

- Less than 5
- Less than 10
- More than 10
- None of the above

**Answer : 3**

**Q29. The Q of a tuned amplifier is 50. If the resonant frequency for the amplifier is 1000kHZ, then bandwidth is …………**

- 10kHz
- 40 kHz
- 30 kHz
- 20 kHz

**Answer : 4**

**Q30. In the above question, what are the values of cut-off frequencies?**

- 140 kHz , 60 kHz
- 1020 kHz , 980 kHz
- 1030 kHz , 970 kHz
- None of the above

**Answer : 2**

**Q31. For frequencies above the resonant frequency, a parallel LC circuit behaves as a ……………. load**

- Capacitive
- Resistive
- Inductive
- None of the above

**Answer : 1**

**Q32. In parallel resonance, there is …………**

- Both voltage and current amplification
- Voltage amplifications
- Current amplification
- None of the above

**Answer : 3**

**Q33. For frequencies below resonant frequency, a series LC circuit behaves as a ………… load**

- Resistive
- Capacitive
- Inductive
- None of the above

**Answer : 2**

**Q34. If a high degree of selectivity is desired, then double-tuned circuit should have …………. coupling**

- Loose
- Tight
- Critical
- None of the above

**Answer : 1**

**Q35. In the double tuned circuit, if the mutual inductance between the two tuned circuits is decreased, the level of resonance curve ………..**

- Remains the same
- Is lowered
- Is raised
- None of the above

**Answer : 3**

**Q36. For frequencies above the resonant frequency , a series LC circuit behaves as a ………….. load**

- Resistive
- Inductive
- Capacitive
- None of the above

**Answer : 2**

**Q37. Double tuned circuits are used in ……………. stages of a radio receiver**

- IF
- Audio
- Output
- None of the above

**Answer : 1**

**Q38. A class C amplifier always drives ………. load**

- A pure resistive
- A pure inductive
- A pure capacitive
- A resonant tank

**Answer : 4**

**Q39. Tuned class C amplifiers are used for RF signals of ………………**

- Low power
- High power
- Very high power
- None of the above

**Answer : 4**

**Q40. For frequencies below the resonant frequency , a parallel LC circuit behaves as a …………… load**

- Inductive
- Resistive
- Capacitive
- None of the above

**Answer : 1**