51. In one of the following circuits, negative feedback does not operate for a negative input. Which one is it? The op-amps are running from ±15 V supplies.
52. Calculate the collector voltage (VC) of the transistor circuit as shown in the figure.
[ Given, α = 0.96, lCBO = 20 μA, VBE = 0.3 V, RB = 100 k$$\Omega $$, VCC = +10 V and RC = 2.2 k$$\Omega $$ ]
[ Given, α = 0.96, lCBO = 20 μA, VBE = 0.3 V, RB = 100 k$$\Omega $$, VCC = +10 V and RC = 2.2 k$$\Omega $$ ]
53. In order to obtain a solution of the differential equation $$\frac{{{d^2}V}}{{d{t^2}}} - 2\frac{{dV}}{{dt}} + {V_1} = 0,$$ involving voltages V(t) and V1, an operational amplifier (op-amp) circuit would require at least
54. The tank circuit of a Hartley oscillator is shown in the figure. If M is the mutual inductance between the inductors, the oscillation frequency is
55. An avalanche effect is observed in a diode when
56. A piece of semiconducting material is introduced into a circuit. If the temperature of the material is raised, the circuit current will
57. The voltage resolution of a 12-bit Digital to Analog Converter (DAC), whose output varies from -10 V to +10 V, is approximately
58. For an intrinsic semiconductor, $$m_e^ * $$ and $$m_h^ * $$ are respectively, the effective masses of electrons and holes near the corresponding band edges. At a finite temperature, the position of the Fermi level
59. Which of the following statements is correct for a common emitter amplifier circuit?
60. Consider the following circuit:
Which of the following correctly represents the output Vout corresponding to the input Vin?
Which of the following correctly represents the output Vout corresponding to the input Vin?