Electronics — Part 2 MCQs with Explanations

3.15 V is the correct answer to “The largest analog output voltage from a 6-bit Digital to Analog Converter (DAC) which produces 1.0 V output for a digital input of 010100, is”. This question is standard in competitive examination syllabi for Electronics.

P = 1, Q = 1, R = 1 is the correct answer to “Which one of the sets of values given below does not satisfy the Boolean relation R = PQ' (where, Q' denotes not Q)”. This question is standard in competitive examination syllabi for Electronics.

electrons moving from the collector to the emitter is the correct answer to “In an n-p-n transistor, the leakage current consists of”. This question is standard in competitive examination syllabi for Electronics.

pinch-off region is the correct answer to “A bipolar junction transistor with one junction forward biased and either the collector or emitter open, operates in the”. This question is standard in competitive examination syllabi for Electronics.

low-pass filter or an integrator is the correct answer to “The circuit shown in the figure can be used as a”. This question is standard in competitive examination syllabi for Electronics.

unipolar device is the correct answer to “A field effect transistor is a”. This question is standard in competitive examination syllabi for Electronics.

CE > CC > CB is the correct answer to “In a typical n-p-n transistor, the doping concentrations in emitter, base and collector regions are C E , C B and C C respectively. These satisfy the relation,”. This question is standard in competitive examination syllabi for Electronics.

4.72 V is the correct answer to “Calculate the collector voltage (V C ) of the transistor circuit as shown in the figure. [ Given, α = 0.96, l CBO = 20 μA, V BE = 0.3 V, R B = 100 k$$\Omega $$, V CC = +10 V and R C = 2.2 k$$\Omega $$ ]”. This question is standard in competitive examination syllabi for Electronics.

two op-amp integrators and one op-amp adder is the correct answer to “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 V 1 , an operational amplifier (op-amp) circuit would require at least”. This question is standard in competitive examination syllabi for Electronics.

$$\frac{1}{{2\pi \sqrt {\left( {{L_1} + {L_2} + 2M} \right)C} }}$$ is the correct answer to “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”. This question is standard in competitive examination syllabi for Electronics.

the reverse voltage exceeds the breakdown voltage is the correct answer to “An avalanche effect is observed in a diode when”. This question is standard in competitive examination syllabi for Electronics.

increase is the correct answer to “A piece of semiconducting material is introduced into a circuit. If the temperature of the material is raised, the circuit current will”. This question is standard in competitive examination syllabi for Electronics.

20 mV is the correct answer to “The voltage resolution of a 12-bit Digital to Analog Converter (DAC), whose output varies from -10 V to +10 V, is approximately”. This question is standard in competitive examination syllabi for Electronics.

depends on both $$m_e^ * $$ and $$m_h^ * $$ is the correct answer to “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”. This question is standard in competitive examination syllabi for Electronics.

There is 180° phase shift between input and output voltages is the correct answer to “Which of the following statements is correct for a common emitter amplifier circuit”. This question is standard in competitive examination syllabi for Electronics.

buffer amplifier is the correct answer to “The circuit, shown is based on ideal operational amplifiers. It acts as a”. This question is standard in competitive examination syllabi for Electronics.

The maximum Zener current IZ(max), when RL = 10 k$$\Omega $$, is 5 mA is the correct answer to “Pick the correct statement based on the above circuit.”. This question is standard in competitive examination syllabi for Electronics.

its very low gate current is the correct answer to “The high input impedance of Field Effect Transistor (FET) amplifier is due to”. This question is standard in competitive examination syllabi for Electronics.

$$3,\,\left( {\frac{V}{4},\,\frac{V}{2},\,\frac{{3V}}{4}} \right)$$ is the correct answer to “An analog voltage V is converted into 2-bit binary number. The minimum number of comparators required and their reference voltages are”. This question is standard in competitive examination syllabi for Electronics.

15 V, 1 k$$\Omega $$ is the correct answer to “In the circuit shown in the figure, the Thevenin voltage V Th and Thevenin resistance R Th as seen by the load resistance R L (= 1 k$$\Omega $$) are respectively”. This question is standard in competitive examination syllabi for Electronics.