Test: Electronics - 3 - Physics MCQ

Let the magnitude of the gain in the inverting Op-Amp circuit shown be x with switch S₁ open. When the switch is closed, the magnitude of gain becomes.

Consider the circuit shown in the figure. Assuming V_BE1 = V_EB2 = 0.7V, the value of the dc voltage V_C2 (in volt) is ___________ .

(Round off to one decimal place)

A Wein bridge oscillator is shown in figure, which of the following statements are true, if 'f' is the frequency of oscillation?

In a voltage follower op-amp circuit, find the closed loop gain V₀/V_s if the open loop gain = 2

The circuit shown in figure is best described as a

In the shunt regulator shown below, the V_z 8.2 V and V_BE = 0.7 V. The regulated output voltage V₀ is

Let  denote the Exclusive OR (XOR) operation. Let '1' and '0' denote the binary constants. Consider the following Boolean expression for F over two variables P and Q :

The equivalent expression for F is

In the Op-Amp circuit shown, assume that the diode current follows the equation I = I_s exp (V/V_T). For V, = 2V, V₀ = V₀₁ and for V_i = 4V, V₀ = V₀₂, The relationsliip between V₀₁ and V₀₂ is

A regulated power supply, shown in figure below, lias an unregulated input (UR) of 15 volts and generates a regulated ouput. Use the component values shown in the figure.

The power dissipation across the transistor Q₁ shown in the figure is 

The output voltage of the regulated power supply shown in figure is

In the circuit shown, assume that diodes D₁ and D₂ are ideal. In the steady-state condition, the average voltage V_ab (in Volts) across the 0.5 μF capacitor is

(Answer should be an integer)

The figure shows a half-wave rectifier. The diode D is ideal. The average steady state current (inAmperes) through the diode is approximately____________

(Answer should be an integer)

The amplifier circuit shown in the figure is implemented using a compensated operational amplier (OP-Amp), and has an open-loop voltage gain, A₀ = 10⁵ V/V and an open-loop cut-off frequency, f_c = 8 Hz.

The voltage gain of the amplifier at 15 kHz. in V/V, is_______________
(Round off to two decimal places)

Consider the circuit shown in the figure Assume base-to-emitter voltage V_BE - 0.8 V. and common base current gain(α) of the transistor is unity.

The value of the collector-to-emitter voltage V_CE(in volts) is_________________.
(Answer should be an integer)

For the given circuit, value of the base current ( I_b) of the npn transistor will be___________mA.
(β is the current gain and assume Op-Amp as ideal).

(Round off to three decimal places)

Transform the following logic circuit (without expressing its switching function) into an equivalent logic circuit that employs only NAND gates each with 2-inputs.

The number ofNAND sate required to implement y =  is__________
(Answer should be an integer)