Electronics MCQs Question and Answer in Engineering Physics

31

A ripple counter designed with J-K flip-flops provided with CLEAR (Cl.) input is shown in the figure. In order that this circuit functions as a MOD-12 counter, the NAND gate inputs (X₁ and X₂) should be
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A) A and C B) A and D C) B and D D) C and D

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Answer & Solution

Answer: Option B

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32

Figure shows a practical integrator with R_s = 30 M$$\Omega $$, R_F = 20 M$$\Omega $$ and C_F = 0.1 μF. If a step (DC) voltage of +3 V is applied as input for 0 ≤ t ≤ 4 (t is in second), the output voltage is
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A) a ramp function of -6 V B) a step function of -12 V C) a ramp function of -15 V D) a ramp function of -4 V

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Answer & Solution

Answer: Option D

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33

Under normal operating conditions, the gate terminals of an n-channel Junction Field Effect Transistor UFET) and an n-channel Metal Oxide Semiconductor Field Effect Transistor (MOSFET) are

A) both biased with positive potentials B) both biased with negative potentials C) biased with positive and negative potentials respectively D) biased with negative and positive potentials respectively

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Answer & Solution

Answer: Option B

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34

The registers Q_D, Q_C, Q_B and Q_A shown in the figure are initially in the state 1010 respectively. An input sequence SI = 0101 is applied. After two clock pulses, the state of the shift registers (in the same sequence Q_D Q_C Q_B Q_A) is
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A) 1001 B) 0100 C) 0110 D) 1010

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Answer & Solution

Answer: Option D

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35

The output V_o of the ideal op-amp circuit shown in the figure is
Electronics mcq question image

A) -7 V B) -5 V C) 5 V D) 7 V

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Answer & Solution

Answer: Option A

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36

For the rectifier circuit shown in the figure, the sinusoidal voltage (V₁ or V₂) at the output of the transformer has a maximum value of 10 V. The load resistance R_L, is 1 k$$\Omega $$. If l_av is the average current through the resistor R_L, the circuit corresponds to a
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A) full-wave rectifier with l_av = 20/π mA B) half-wave rectifier with l_av = 20/π mA C) half-wave rectifier with l_av = 10/π mA D) full-wave rectifier with l_av = 10/π mA

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Answer & Solution

Answer: Option A

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37

Which one of the following is true for a semiconductor p-n junction with no external bias?

A) The total charge in the junction is not conserved B) The p-side of the junction is positively charged C) The p-side of the junction is negatively charged D) No charge develops anywhere in the junction

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Answer & Solution

Answer: Option C

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38

The feedback ratio of an amplifier, which on application of a negative feedback, changes the voltage gain from -250 to -100 is

A) -0.250 B) -0.025 C) -0.060 D) -0.006

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Answer & Solution

Answer: Option D

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39

When an input voltage V_in, of the form shown, is applied to the circuit given below, the output voltage V_o is of the form
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