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Electronics Engineering
Electronics Engineering is a branch of engineering that deals with practical applications of electronic components, devices, systems, or equipment. Electronics are devices that operate on low voltage sources, as in electron tubes, transistors, integrated circuits, and printed circuit boards and use electricity as part of its driving force.
24,372 Questions
What are the advantages of transistor-transistor logic?
Transistor-transistor logic (TTL) is a class of digital circuits built from bipolar junction transistors (BJT) and resistors. It is called transistor-transistor logic because both the logic gating function and the amplifying function are done by transistors.
To know about the advantages of TTL logic family, one should have a basic idea about RTL, DTL etc. Diode logic (DL) uses diodes to implement logical functions like AND and OR. But the disadvantage is that it can not perform NOT operation. As AND and OR are not complete functions by themselves, they can not perform several logic functions without NOT. Hence, there was a need for some device which can perform a NOT function as diodes can not. That device is a transistor. Then came the DTL which uses a transistor along with diodes. As a transistor can act as an inverter, NAND (NOT-AND) & NOR (NOT-OR) operations can be performed. But this logic uses several diodes which will slow down its operation. Due to the delay offered by them, the logic levels may sometimes change i. e. 0 t0 1 or 1 to 0. Then came TTL. This logic uses a multi emitter transistor, a transistor with many emitter terminals. As every emitter is nothing but a diode, this logic eliminates the use of all diodes. This is the major advantage. As transistor becomes ON and OFF much rapidly than a diode, switching time will be faster.
TTL, or Transistor-transistor logic replaced resistor-transistor logic, and used much less power. The TTL family is very fast and reliable, and newer faster, less power-consuming, etc. types are always being developed.
ANSWER: ONE WORD SPEED
Define analog digital and hybrid computers?
Ans. Difference between a digital and hybrid computer:
Digital Computers:
These are general purpose computers. They accept data in the form of discrete digits (0 and 1). They have large storage capacity. They come in many sizes and shapes. They are generally used in every field of life. They are slow but accurate as compared to analog computers.
Hybrid Computers:
Hybrid computers combine best features of analog and digital computers i.e. speed, accuracy reliability etc. They are special purpose computers, which are fast and accurate. Hybrid computers help the user to handle both analog and digital type of data.
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What is the relationship between bandwidth and range?
A: Different names for the same description. A range can describe from here to there so does a bandwidth.
Unit step signal is energy or power signal?
The unit step signal is a Power signal. Since when we find the power it comes to 1/2 (i.e finite value). And when we find its energy, we got INFINITY. If a signal has energy as infinity and power as a finite non-zero value, then it is a power signal, not an energy signal.
Which of the following is not one of the purposes of the ICS?
the establishment of a multi-agency, multi-jurisdictional incident management team
The establishment of a multi-agency, multi-jurisdictional incident management team
What is the purpose of specifying the tolerance of a resistor?
on electronic components, of course, can not be made absolutely perfect. so there must be imperfections in the making, it is called tolerance.
for ex: 100ohm resistor ,a tolerance of 5%, meaning the resistance between 95-105ohm (100ohm * + / -5%). not fit 100ohm.
Does the current ina circuit increase with increase in temperature?
Resistance increases as temperature increases. If Voltage is held constant then according to Ohm's Law Voltage = Current x Resistance then current would decrease as resistance increases.
What are the possible remedies against corona because of extra high voltage?
increase the size of conductor ,provide the hallow conductor,increase the critical disruptive voltage bv providing shunt capacitors. these capacitors increases the power capacity of the line.
What is space charge region in pn junction?
The depletion region is also called as the space charge region.
A p-n junction diode is formed by placing p and n type semiconductor materials in intimate contact on an atomic scale. This may be achieved by diffusing acceptor impurities into an n type silicon crystal or by the opposite sequence.
In an open circuit p-n junction diode, majority carriers from either side will diffuse across the junction to the opposite side where they are in minority. These diffusing carriers will leave behind a region of ionized atoms at the immediate vicinity of the metallurgical junction. This region of immobile ionized atoms is called the space charge region.
Why does gasoline conduct electricity?
In my knowledge, any liquid will conduct electricity. It was one of my first childhood lessons. Haha
Fuel (gasoline) is made of hydrocarbons such as isooctane. Hydrocarbons itself has no free electrons, nor charges, so it is not conductive.
Explain the operation of a varactor diode in generation of FM?
Varactor diodes are constructed in the same way as a capacitor and operate under reverse bias conditions, which gives rise to three current-conducting regions. Currents conduct through positive (P) and negative (N) regions, located at either end of the diode. Near the junction of the P and N regions, a depletion region ensures that no current carriers are available, thus acting as an insulator. Due to this arrangement, a varactor diode's conductive plates are separated by an insulatorlike dielectric, much like a capacitor
Read more: Characteristics of Varactor Diodes | eHow http://www.ehow.com/list_6300842_characteristics-varactor-diodes.html#ixzz2UqM6t1Yi
What is the diffirence of silicon unilateral switch and silicon bilateral switch?
SUS - Silicon Unilateral Switch
is a type of thyristor used as a breakover device that conducts current in only one direction, it has a third terminal that is used to alter the breakover voltage if connected to a zener diode.
SBS - Silicon Bilateral Switch
is a type of thyristor used as a breakover device which is capable of triggering triacs, it has a lower breakover voltage compared to triacs.
What is the typical voltage drop across a photodiode?
The photodiode's voltage drop varies with the temperature and current flowing through it. The typical voltage drop (VBIAS - VREF) across the MAX4007 series is 0.8V, with a guaranteed maximum of 1.1V.
What color are the directional capacitors?
They can be many different colors, shapes and sizes. To identify whether a capacitor is directional or not, you must look at the markings on it - if it is directional, it will have a little +, and possibly a - to denote directionality (some only have the + I believe due to size).
In general, electrolytic capacitors are normally directionalized. These are the capacitors that resemble batteries in shape, and usually have an 'X' on the bottom (this creates a weak point in the casing; if the capacitor overheats for whatever reason - overvoltaging, or revers polarizing- the 'X' will fail first).
What is the difference between characteristic impedance and intrinsic impedance?
I believe intrinsic impedance is more tied to the medium, thus is defined in terms of magnetic and electric permeability and electrical conductivity, while characteristic impedance is a "wider" look at the impedance.
For example, you can calculate the intrinsic impedance of a 18 awg copper wire, or air, or a vacuum. If you wanted to use coax cable with an 18 awg core, you would be looking at the characteristic impedance, not the intrinsic impedance of the copper that will be carrying the waveform.
Applications of variable DC power supply?
Variable dc supply is applicable in loads that are variable.
What is the effect of the filter capacitor on the output wave shape of the rectifier?
The larger the cap the smaller the ripple at the power supplies output. It smooths the rectifiers output waveform.
What happens to the current at a junction in a parallel circuit?
In a parallel circuit the current divides when it comes to a junction. Part of the current flows through one branch and the other part flows through the other.
When the two branches have the same resistance, the same current flows through each branch.
When the two branches have different resistances, a bigger current flows through the branch with the smaller resistance - it's just easier this way!
Hope i helped ;)
