Analog Electronics - Section 1 (4)
Analog Electronics - Section 1
| 25. | Negative feedback reduces noise originating at the amplifier input. |
|||
Answer: Option B Explanation: It has no effect on noise originating at amplifier input. |
| 26. | Assertion (A): For large signal variations an amplifier circuit has to be analysed graphically Reason (R): The output characteristics of a transistor is nonlinear. |
|||||||
Answer: Option A Explanation: Since the characteristics is non-linear, graphical analysis is needed. |
| 27. | Assertion (A): CE amplifier is the most widely used BJT amplifier Reason (R): CE amplifier has zero phase difference between input and output |
|||||||
Answer: Option C Explanation: There is 180° phase difference between input and output. |
| 28. | The efficiency of a full wave rectifier using centre tapped transformer is twice that in full wave bridge rectifier. |
|||
Answer: Option B Explanation: Efficiency of full wave rectifier with centre tapped transformer is slightly higher than that of bridge rectifier. |
| 29. | In the amplifier circuit of figure hfe = 100 and hie = 1000 Ω. The voltage gain of amplifier is about |
|||||||
|
| 30. | The transistor of following figure in Si diode with a base current of 40 μA and ICBO = 0, if VBB = 6V, RE = 2 kΩ and β = 90, IBQ = 20 μA then RB = |
|||||||
|
| 31. | An amplifier has a large ac input signal. The clipping occurs on both the peaks. The output voltage will be nearly a |
|||||||
Answer: Option B Explanation: When a sinusoidal voltage is clipped on both sides it resembles a square wave. |
| 32. | For a system to work, as oscillator the total phase shift of the loop gain must be equal to |
|||||||
Answer: Option D Explanation: |
AB = 1 ∠0° or 360°.