Integrated Circuits - Electronic Engineering (MCQ) questions & answers
Dear Readers, Welcome to Integrated Circuits multiple choice questions and answers with explanation. These objective type Integrated Circuits questions are very important for campus placement test, semester exams, job interviews and competitive exams like GATE, IES, PSU, NET/SET/JRF, UPSC and diploma.
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1) Which among the following are regarded as three-pin voltage regulator ICs?
- Published on 20 Nov 15
a. Fixed voltage regulators
b. Adjustable voltage regulators
c. Both a and b
d. None of the above
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2) Due to operation of series pass transistor in an active region of linear voltage regulator, ___________
- Published on 20 Nov 15
a. The ripple contents in o/p voltage waveform is very low
b. Then there is no necessity of using high speed transitor
c. Both a and b
d. None of the above
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3) Which type of IC voltage regulator exhibits continuous variation in the impedance of transistor in order to supply the desired load current?
- Published on 20 Nov 15
a. Linear regulators
b. Switching regulators
c. Both a and b
d. None of the above
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4) In LM317 voltage regulator, what is the minimum value of voltage required between its input & output in order to supply power to an internal circuit?
- Published on 20 Nov 15
a. 1V
b. 3V
c. 5V
d. 10V
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5) In LM317 voltage regulator, the protective diodes do not allow the filter capacitors to discharge through ______current points.
- Published on 20 Nov 15
a. High
b. Low
c. Both a and b
d. None of the above
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6) In AM detector using PLL, the phase detector is basically a multiplier which produces ________components of frequencies at its output.
- Published on 20 Nov 15
a. Sum
b. Difference
c. Both a and b
d. None of the above
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7) For a PLL IC 565 with timing resistor & timing capacitor of about 15 kΩ & 0.02μF respectively, what would be the value of output frequency (f0)?
- Published on 20 Nov 15
a. 433.33 Hz
b. 833.33 Hz
c. 1000 Hz
d. 2500 Hz
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8) In VCO IC 566, the value of charging & discharging is dependent on the voltage applied at ______.
- Published on 20 Nov 15
a. Triangular wave output
b. Square wave output
c. Modulating input
d. All of the above
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9) According to transfer characteristics of PLL, the phase error between VCO output & incoming signal must be maintained between _______ in order to maintain a lock.
- Published on 20 Nov 15
a. 0 & π
b. 0 & π/2
c. 0 & 2π
d. π & 2π
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10) Which characteristic of PLL is defined as the range of frequencies over which PLL can acquire lock with the input signal?
- Published on 20 Nov 15
a. Free-running state
b. Pull-in time
c. Lock-in range
d. Capture range
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