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transistor tuned amplifiers MCQs

Practise focused transistor tuned amplifiers questions with marked answers for exam preparation and subject revision.

transistor tuned amplifiers Mcqs
1. For frequencies above the resonant frequency, a parallel LC circuit behaves as a ____________ load?
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A. Capacitive

B. Inductive

C. None of the above

D. Resistive

2. When either L or C is increased, the resonant frequency of LC circuit ____________?
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A. Insufficient data

B. Decreases

C. Increases

D. Remains the same

3. The Q of a tuned circuit refers to the property of_______________?
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A. Selectivity

B. None of the above

C. Fidelity

D. Sensitivity

4. At parallel resonance, the phase angle between the applied voltage and circuit current is _____________?
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A. None of the above

B. 180o

C. 0o

D. 90o

5. Frequencies above ______________ kHz are called radio frequencies?
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A. 200

B. 10

C. 50

D. 2

6. At series or parallel resonance, the circuit behaves as a ______________ load?
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A. Resistive

B. None of the above

C. Capacitive

D. Inductive

7. For frequencies above the resonant frequency , a series LC circuit behaves as a ____________load?
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A. Inductive

B. Resistive

C. Capacitive

D. None of the above

8. In parallel resonance, there is _______________?
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A. Both voltage and current amplification

B. Voltage amplifications

C. Current amplification

D. None of the above

9. The Q of an LC circuit is given by _________________?
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A. 2pfr x R

B. R2/2pfrL

C. R / 2pfrL

D. 2pfrL / R
10. In the double tuned circuit, if the mutual inductance between the two tuned circuits is decreased, the level of resonance curve ___________________?
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A. Is lowered

B. Remains the same

C. None of the above

D. Is raised
11. A tuned amplifier is generally operated in ____________operation?
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A. Class A

B. Class B

C. Class C

D. None of the above

12. If a high degree of selectivity is desired, then double-tuned circuit should have ___________ coupling?
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A. None of the above

B. Loose

C. Critical

D. Tight

13. In series resonance, there is__________________?
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A. Voltage amplification

B. Current amplification

C. Both voltage and current amplification

D. None of the above

14. At parallel resonance, the ratio L/C is ______________?
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A. Zero

B. None of the above

C. Small

D. Very large
15. If the resistance of a tuned circuit is increased, the Q of the circuit _______________?
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A. Is decreased

B. Is increased

C. None of the above

D. Remains the same

16. The Q of a tuned amplifier is 50. If the resonant frequency for the amplifier is 1000kHZ, then bandwidth is __________________?
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A. 10kHz

B. 30 kHz

C. 20 kHz

D. 40 kHz

17. In a parallel LC circuit, if the input signal frequency is increased above resonant frequency then _______________?
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A. XL increases and XC decreases

B. XL decreases and XC increases

C. Both XL and XC increase

D. Both XL and XC decrease

18. At series resonance, voltage across L is____________voltage across C?
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A. Less than but in phase with

B. Equal to but opposite in phase to

C. Greater than but in phase with

D. Equal to but in phase with

19. A class C amplifier always drives _____________load?
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A. A resonant tank

B. A pure capacitive

C. A pure inductive

D. A pure resistive

20. Double tuned circuits are used in ____________ stages of a radio receiver?
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A. None of the above

B. Output

C. IF

D. Audio

21. If L/C ratio of a parallel LC circuit is increased, the Q of the circuit______________?
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A. None of the above

B. Is decreased

C. Is increased

D. Remains the same

22. At parallel resonance, the net reactive component circuit current is _______________?
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A. Capacitive

B. Zero

C. Inductive

D. None of the above

23. In the above question, what are the values of cut-off frequencies?
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A. 1020 kHz , 980 kHz

B. 1030 kHz , 970 kHz

C. None of the above

D. 140 kHz , 60 kHz

24. A resonant circuit contains ____________elements?
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A. R and L only

B. L and C

C. R and C only

D. Only R

25. A tuned amplifier is used in ___________ applications?
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A. None of the above

B. Low frequency

C. Radio frequency

D. Audio frequency

26. The Q of a tuned amplifier is generally _________________?
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A. Less than 10

B. Less than 5

C. None of the above

D. More than 10
27. At series resonance, the circuit offers____________ impedance?
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A. None of the above

B. Maximum

C. Zero

D. Minimum
28. In parallel resonance, the circuit impedance is_________________?
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A. CR/L

B. C/LR

C. R/LC

D. L/CR
29. In a parallel LC circuit, if the signal frequency is decreased below the resonant frequency, then________________?
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A. None of the above

B. Line current becomes minimum

C. XL increases and XC decreases

D. XL decreases and XC increases
30. A tuned amplifier uses__________load?
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A. Resistive

B. LC tank

C. Inductive

D. Capacitive

31. The voltage gain of a tuned amplifier is____________at resonant frequency
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A. Maximum

B. Half-way between maximum and minimum

C. Minimum

D. Zero

32. Tuned class C amplifiers are used for RF signals of________________?
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A. None of the above

B. Low power

C. Very high power

D. High power

33. At series or parallel resonance, the circuit power factor is ________________?
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A. 0

B. 1

C. 8

D. 5

34. The dimensions of L/CR are that of _______________?
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A. Farad

B. Henry

C. None of the above

D. Ohm
35. At series resonance, the net reactive component of circuit current is _______________?
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A. Capacitive

B. None of the above

C. Zero

D. Inductive

36. For frequencies below resonant frequency, a series LC circuit behaves as a _____________ load?
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A. Resistive

B. Inductive

C. None of the above

D. Capacitive
37. For frequencies below the resonant frequency , a parallel LC circuit behaves as a ______________load?
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A. Resistive

B. None of the above

C. Capacitive

D. Inductive
38. At parallel resonance, the line current is_______________?
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A. Quite large

B. Minimum

C. Maximum

D. None of the above

39. If Q of an LC circuit increases, then bandwidth ______________?
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A. Decreases

B. Remains the same

C. Insufficient data

D. Increases

40. At series resonance, the phase angle between applied voltage and circuit is______________?
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A. 90o

B. 180o

C. 0o

D. None of the above