Electronics Q & A - Inst Tools

Diodes Questions & Answers

Editorial Staff — Sat, 13 Aug 2016 02:03:10 +0000

1. Explain what is a pn junction? The contact surface between the layers of p-type and n-type semiconductor pieces plated together so as to form a p-n junction is called the p-n junction. 2. Why is silicon preferred over germanium in the manufacture of semiconductor devices? The silicon semiconductor devices have, in general, higher PIV […]

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Electronics Questions & Answers

Editorial Staff — Fri, 29 Jul 2016 05:50:21 +0000

1. What is Electronic? The study and use of electrical devices that operate by controlling the flow of electrons or other electrically charged particles. 2. What is communication? Communication means transferring a signal from the transmitter which passes through a medium then the output is obtained at the receiver. (or)communication says as transferring of message […]

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Operational Amplifiers Questions & Answers

Editorial Staff — Thu, 16 Jun 2016 01:41:06 +0000

1. Explain what is an operational amplifier? An operational amplifier, abbreviated as op-amp, is basically a multi-stage, very high gain, direct-coupled, negative feedback amplifier that uses voltage shunt feedback to provide a stabilized voltage gain. 2. State assumptions made for analyzing ideal op-amp. Assumptions made for analyzing ideal op-amp are : Infinite open-loop gain Infinite […]

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Logic Gates Questions and Answers

Editorial Staff — Mon, 06 Jun 2016 03:28:40 +0000

1. Explain what is a combinational circuit? In a combinational circuit, the output depends upon present input(s) only i.e, not dependant on the previous input(s). The combinational circuit has no memory element. It consists of logic gates only. 2. Write two characteristics of combinational circuits. The two characteristics of combinational circuits are: In combinational circuits, […]

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Electronic Meters Questions & Answers

Editorial Staff — Sun, 01 May 2016 10:36:51 +0000

1. Explain what is the difference between an ammeter and a voltmeter? Ammeter is a low resistance indicating instrument while the voltmeter is a high resistance one. 2. Explain why an ammeter should be of very low resistance? Ammeter, which is connected in series with the circuit carrying the current under measurement, must be over […]

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Basic Electronics Questions & Answers

Editorial Staff — Sat, 16 Apr 2016 16:36:10 +0000

1) What is an Electric Potential? The potential of a particular point, is defined as the work done to move a positive charge particle to move to that point in opposite to electric field. It may be an external energy applied to move that positive charge or may be internal potential energy of the positive […]

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Transistors Questions & Answers

Editorial Staff — Sat, 16 Apr 2016 15:26:12 +0000

What is a transistor and types of transistors? Transistor is a semiconductor device capable of transferring the signal from high resistance to low resistance or vice versa. Transistor has three terminals and is used in electronic circuits as amplifiers and switches. There are mainly three types of transistors used in electronic circuits they are a) […]

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Semiconductors Diodes Questions & Answers

Editorial Staff — Sat, 16 Apr 2016 15:08:23 +0000

What is a PN junction diode? The name PN junction diode stands for a junction termed as PN junction formed by injecting into one side of intrinsic semiconductor crystal acceptor impurities (forming a p-type semiconductor )and donor impurities from the other side(forming an n-type semiconductor) with two active terminals (di means two) of one terminal […]

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Amplifiers Questions & Answers

Editorial Staff — Sat, 16 Apr 2016 14:55:18 +0000

What is the effect of negative feedback on voltage gain, BW, Noise, nonlinear distortion, Ri, Ro of a voltage amplifier? The voltage gain, bandwidth, noise, nonlinear distortion, input resistance, output resistance are Voltage gain with feedback = Voltage gain without feedback* desensitivity factor (since desensitivity factor << 1 in negative feedback, hence Voltage gain without […]

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Bipolar Junction Transistors Questions & Answers

Editorial Staff — Sat, 19 Mar 2016 11:17:36 +0000

1. Explain why an ordinary junction transistor is called bipolar? Because the transistor operation is carried out by two types of charge carriers (majority and minority carriers), an ordinary transistor is called bipolar. 2. Why transistor is called current controlled device? The output voltage, current or power is controlled by the input current in a […]

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