transistor tuned amplifiers Mcqs
1. For frequencies above the resonant frequency, a parallel LC circuit behaves as a ____________ load?
comments icon0
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 ____________?
comments icon0

A. Insufficient data

B. Decreases

C. Increases

D. Remains the same

3. The Q of a tuned circuit refers to the property of_______________?
comments icon0
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 _____________?
comments icon0

A. None of the above

B. 180o

C. 0o

D. 90o

5. Frequencies above ______________ kHz are called radio frequencies?
comments icon0
A. 200

B. 10

C. 50

D. 2

6. At series or parallel resonance, the circuit behaves as a ______________ load?
comments icon0
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?
comments icon0
A. Inductive

B. Resistive

C. Capacitive

D. None of the above

8. In parallel resonance, there is _______________?
comments icon0

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 _________________?
comments icon0

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 ___________________?
comments icon0

A. Is lowered

B. Remains the same

C. None of the above

D. Is raised
11. A tuned amplifier is generally operated in ____________operation?
comments icon0

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?
comments icon0

A. None of the above

B. Loose

C. Critical

D. Tight

13. In series resonance, there is__________________?
comments icon0
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 ______________?
comments icon0

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 _______________?
comments icon0
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 __________________?
comments icon0

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 _______________?
comments icon0
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?
comments icon0

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?
comments icon0
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?
comments icon0

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______________?
comments icon0

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 _______________?
comments icon0

A. Capacitive

B. Zero

C. Inductive

D. None of the above

23. In the above question, what are the values of cut-off frequencies?
comments icon0
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?
comments icon0

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?
comments icon0

A. None of the above

B. Low frequency

C. Radio frequency

D. Audio frequency

26. The Q of a tuned amplifier is generally _________________?
comments icon0

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?
comments icon0

A. None of the above

B. Maximum

C. Zero

D. Minimum
28. In parallel resonance, the circuit impedance is_________________?
comments icon0

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________________?
comments icon0

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?
comments icon0

A. Resistive

B. LC tank

C. Inductive

D. Capacitive

31. The voltage gain of a tuned amplifier is____________at resonant frequency
comments icon0
A. Maximum

B. Half-way between maximum and minimum

C. Minimum

D. Zero

32. Tuned class C amplifiers are used for RF signals of________________?
comments icon0
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 ________________?
comments icon0

A. 0

B. 1

C. 8

D. 5

34. The dimensions of L/CR are that of _______________?
comments icon0

A. Farad

B. Henry

C. None of the above

D. Ohm
35. At series resonance, the net reactive component of circuit current is _______________?
comments icon0

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?
comments icon0

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?
comments icon0

A. Resistive

B. None of the above

C. Capacitive

D. Inductive
38. At parallel resonance, the line current is_______________?
comments icon0

A. Quite large

B. Minimum

C. Maximum

D. None of the above

39. If Q of an LC circuit increases, then bandwidth ______________?
comments icon0
A. Decreases

B. Remains the same

C. Insufficient data

D. Increases

40. At series resonance, the phase angle between applied voltage and circuit is______________?
comments icon0

A. 90o

B. 180o

C. 0o

D. None of the above