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BASIC ELECTRONICS MC Qs 2
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BASIC ELECTRONICS MCQs 2 Posted by mcqsworld
TMD - Solid State BASIC ELECTRONICS MCQs 2
(mcqs (mcq s of basic electronics) Q. 1 In an intrinsic semiconductor, the Fermi-level is (A) Closer to the valence band (B) Midway between conduction and valence band (C) Closer to the conduction band (D) Within the valence band Ans A ns:: C Q. 2 The reverse – saturation current of a silicon diode (A) Doubles for every 10°C increase in temperature (B) Does not change with temperature (C) Halves for every 1°C decrease in temperature (D) Increases by 1.5 times for every 2°C increment in temperature Ans: A Q. 3 The common collector amplifier is also known as (A) Collector follower (B) Base follower (C) Emitter follower (D) Source follower Ans: C Q. 4 In class–A amplifier, the output current flows for (A) A part of the cycle or the input signal. (B) The full cycle of the input signal. (C) Half the cycle of the input signal. (D) 3 3/4 /4th of the cycle of the input signal. Ans: B Q. 5 In an amplifier with negative feedback (A) Only the gain of the amplifier is affected (B) Only the gain and bandwidth of the amplifier are affected (C) Only the input and output impedances are affected (D)All of the four parameters mentioned above would be affected Ans: D Q. 6 Wien bridge oscillator can typically generate frequencies in the range of (A) 1 KHz – 1MHz (B) 1 MHz – 10MHz (C) 10MHz – 100MHz
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BASIC ELECTRONICS MCQs 2 (D) 100MHz – 150MHz
Ans: A Q. 7 A differential amplifier, amplifies (A) And mathematically differentiates the average of the voltages on the two input lines (B) And differentiates the input waveform on one line when the other line is grounded (C) The difference of voltages between the two input lines (D) And differentiates the sum of the two input waveforms Ans: C Q. 8 The transformer utilization factor of a half-wave rectifier is approximately (A) 0.6 (B) 0.3 (C) 0.9 (D) 1.1 Ans: B 0.286 ≈ 0.3 Q. 9 The dual of the Boolean expression: x + y + z is
Ans: C Q.10 It is required to construct a counter to count up to 100(decimal). The minimum number of flipflops required to construct the counter is (A) 8 (B) 7 (C) 6 (D) 5 Ans: A Q.11 The power conversion efficiency of an output stage is defined as_______. (A) (Load power + supply power) / supply power (B) (Load power + supply power) / (load power-supply power) (C) Load power / supply power (D) Supply power / load power Ans. (C) Power gain is defined as the ratio of output signal power to that of input signal power. Q.12 A highly stable resonance characteristic is the property of a ____ oscillator. (A) Hartley (B) Colpitts (C) Crystal (D) Weinbridge Ans. (C) Q.13 The gate that assumes the 1 state, if and only ifthe input does not take a 1 state is called________. (A) AND gate (B) NOT gate (C) NOR gate (D) Both (B) & (C) Ans. (D)
therefore output is high only when the values of both A and B are 0. Q.14 The width of depleted region of a PN junction is of the order of a few tenths of a ___________. (A) Millimeter (B) Micrometer (C) Meter (D) Nanometer Ans. (B)
Q.15 For NOR circuit SR flip flop the not allowed condition is ________. (A)S=0, R=0. (B)S=0, R=1. (C)S=1, R=1. (D)S=1, R=0. Ans. (C) When S=R=1 the output is subject to unpredictable behavior when S and R return to 0 simultaneously. Q.16 In negative feedback the return ratio is __________. (A) 0 (B) 1 (C) Greater than 0 (D) Greater than 1 Ans. (C) In a negative feedback circuit, always the return ratio will be in the range of 0 to 1. Q.17 A phase shift oscillator uses __________________. (A) LC tuning (B) Piezoelectric crystal (C) Balanced bridge (D) Variable frequency operation Ans. (C) Q.18 The voltage gain of basic CMOS is approximately _________.
Ans. (A) Q.19 Transistor is a (A) Current controlled current device. (B) Current controlled voltage device. (C) Voltage controlled current device. (D) Voltage controlled voltage device. Ans. (A) The output current depends on the input current. Q.20 A bistable multivibrator is a (A) Free running oscillator. (B) Triggered oscillator. (C) Saw tooth wave generator. (D) Crystal oscillator. Ans. (B) The transistors would change their state of operation from ON to OFF and vice versa depending on the external trigger provided. (mcqs of basic electronics) -69%
