26. Who was the Prime minister of India when the 73rd and 74th amendments of constitution were passed.?
27. Consider the following statements : A clamper circuit adds or subtracts a dc voltage to a waveformdoes not change the waveformamplifiers the waveform Which are correct?
28. In figure v1 = 8 V and v2 = 8 V. Which diode will conduct?
29. A forward voltage of 9 V is applied to a diode in series with a 1 kΩ load resistor. The voltage across load resistor is zero. It indicates that
30. Which power amplifier can deliver maximum load power?
31. A CB amplifier has re = 6 Ω, RL = 600 Ω and a = 0.98. The voltage gain is
32. A bridge rectifier circuit has input of 50 Hz frequency. The load resistance is RL and filter capacitance is C. For good output wave shape, the time constant RLC should be at least equal to
33. Si transistor of following figure has a = 0.9 and ICE= 0, VEE = 5 V and VCC = 13 V, then RE will be if IEQ = 1 mA
34. In class C operation of an amplifier circuit, the collector current exists for
35. The 'h' parameters of the circuit shown in the figure are hib = 25 Ω, hfb = 0.999 and hob = 10-6Ω The Voltage gain is
36. An exponential amplifier has diode in feedback path.
37. DC amplifiers have a tendency to be unstable.
38. A half wave diode rectifier has a capacitance input filter. If input voltage is Vm sin ωt, PIV is
39. An amplifier with loop gain Aβ will be more stable for value of Aβ as
40. Study the circuit of figure and examine the following statements
It is an active low pass finer.It is a second order filter.The change in gain is 40 dB/decade. Which of the above statements are correct?
41. In a circuit of figure, Vs = 10 cos(ωt) power drawn by the 2Ω resistor is 4 watts. The power factor is
42. The quiescent collector current IC, and collector to emitter voltage VCE in a CE connection are the values when
43. In the op-amp circuit of figure, V0 =
44. Figure shows the self bias circuit for CE amplifier and its equivalent circuit. VBB and RB respectively are
45. Figure is a 24 Vr stabilized power supply. The zener is 24 V, 600 mW. The minimum zener current is 10 mA. Proper values R and maximum load current are
46. The open loop gain of an amplifier is 200. If negative feedback with β = 0.2 is used, the closed loop gain will be
47. In a class C power amplifier the input signal has a frequency of 250 kHz. If the collector current pulses are 0.1 μs wide, the duty cycle of current waveform is
48. In figure as the load resistance is changed
49. In figure, voltage across R2 = + 10 V. If VBE = 0.7 V and VE = 0.7 V and RE = 10 kΩ, current through RE is
50. A 12 kHz pulse wave-form is amplified by a circuit having an Upper cut-off frequency of 1 MHz. The minimum input pulse width that can be accurately reproduced is