Electronic Circuits

31. An oscillator converts

1. ac power into dc power
2. dc power into ac power
3. mechanical power into ac power
4. electrical power into mechanical power

View answer

32. An oscillator employs _________ feedback.

1. Positive
2. Negative
3. Both positive and negative
4. Neither positive nor negative

View answer

33. An oscillator oscillates due to

1. Negative feedback
2. Positive feedback
3. Both positive and negative feedback
4. Neither positive nor negative feedback

View answer

34. An oscillator produces _________ oscillations.

1. Damped
2. Modulated
3. Undamped
4. Sinusoidal

View answer

35. At zero signal condition, a transistor sees _________ load.

1. dc
2. ac
3. both dc and ac
4. resistive

View answer

36. Calculate the ripples of the filter output if a dc and ac voltmeter is used and measures the output signal from a filter circuit of 25 VDC and 1.5 Vrms

1. 5%
2. 10%
3. 50%
4. 6%

View answer

37. Cascaded amplifiers total decibel gain is equal to

1. The sum of the individual gains
2. The product of the individual gains
3. The difference of the individual gains
4. The quotient of the individual gains

View answer

38. CC configuration is used for impedance matching because its

1. Input impedance is very high
2. Input impedance is very low
3. Output impedance is very low
4. Output impedance is zero

View answer

39. Class A operation has a maximum possible efficiency of _________ percent.

1. 100%
2. 50%
3. 75%
4. 25%

View answer

40. Class B operation has a maximum possible frequency of _________ percent.

1. 100%
2. 78.5%
3. 75%
4. 2.2%

View answer